Tue·Aug 7, 2018Tuesday·August 7, 2018

1. 01*

   Constraining R-axion models through dijet searches at the LHC

   Ernesto Arganda🇦🇷 · Anibal D. Medina🇦🇷 · Nicolas I. Mileo🇦🇷 · Roberto A. Morales🇦🇷 · Alejandro Szynkman🇦🇷

   The search at hadron colliders for new massive resonances of a few 100 GeVs that couple effectively to colored states is an extremely challenging issue, due principally to the presence of large QCD multijet backgrounds at this energy, rendering the searches at the LHC particularly difficult. Recently, it was realized that these large backgrounds could be overcome by demanding one high-$p_T$ jet from initial-state radiation (ISR) and by means of novel jet-reconstruction techniques through which the resulting hadronized products of the massive resonances are reconstructed as a fat-jet, a unique large-radius jet. The ATLAS and CMS Collaborations have recently reported searches for the experimental signature of a single fat-jet in association with an ISR jet. Models of dynamical supersymmetry breaking with an spontaneously broken R-symmetry give rise to the appearance of a pseudo-Nambu-Goldstone boson called the R-axion, which naturally tends to be light. In the parameter space regions where the anomalous R-axion coupling to gluons is boosted, these models can be tested against these new LHC dijet searches. Taking into account the CMS search, we apply the $q_{\mu }$ statistical method to the signal events against the background-only expectation and obtain the 95\% C.L. exclusion limits on the most relevant model parameters for a particular messenger sector, namely, the R-axion mass $m_a$, the decay constant $f_a$, and the number of color messengers $N$, being these limits suitable to be applied to more general models with axion-like particles.

   hep-phhep-exPLB(2019)·8 citations
2. 02*

   Higgs Physics: It ain't over till it's over

   Sally Dawson🇺🇸 · Christoph Englert🇬🇧 · Tilman Plehn🇩🇪

   We review the theoretical underpinning of the Higgs mechanism of electroweak symmetry breaking and the experimental status of Higgs measurements from a pedagogical perspective. The possibilities and motivations for new physics in the symmetry breaking sector are discussed along with current measurements. A focus is on the implications of measurements in the Higgs sector for theoretical insights into extensions of the Standard Model. We also discuss of future prospects for Higgs physics and new analysis techniques.

   hep-phhep-exPhys.Rept.(2019)·103 citations
3. 03*

   Time-evolution of fluctuations as signal of the phase transition dynamics in a QCD-assisted transport approach

   M. Bluhm🇵🇱 · Y. Jiang🇨🇳 · M. Nahrgang🇫🇷 · J.M. Pawlowski🇩🇪 · F. Rennecke🇺🇸 · N. Wink🇩🇪

   For the understanding of fluctuation measurements in heavy-ion collisions it is crucial to develop quantitatively reliable dynamical descriptions which take the non-perturbative nature of QCD near the phase transition into account. We discuss a novel QCD-assisted transport approach based on non-equilibrium chiral fluid dynamics and the effective action of low energy QCD. In this framework, we study the time-evolution of fluctuation measures of the critical mode, notably the kurtosis, for a non-expanding system. From this, we can estimate the equilibration times of critical mode fluctuations in the QCD phase diagram. These allow us to identify both the phase boundary and the critical region near the QCD critical point.

   hep-phhep-thnucl-thNPA(2019)·30 citations
4. 04*

   R-parity violating solutions to the $R_{D^{(\ast )}}$ anomaly and their GUT-scale unifications

   Quan-Yi Hu🇨🇳 · Xin-Qiang Li🇨🇳 · Yu Muramatsu🇨🇳 · Ya-Dong Yang🇨🇳

   Recently, several $B$-physics experiments report interesting anomalies in the semi-leptonic decays of $B$-mesons, such as the excess in the $R_{D^{(\ast )}}$ measurements. These anomalies seem to suggest intriguing hints of lepton flavor non-universality, and the R-parity violating (RPV) interactions are candidates for explaining this non-universality. In this paper, we discuss the RPV interactions for resolving the $R_{D^{(\ast )}}$ anomaly with the Grand Unified Theory (GUT) assumption. To solve the $R_{D^{(\ast )}}$ anomaly, it is known that large RPV couplings and around $1\mathrm{TeV}$ sfermion masses are required. At the same time, large RPV couplings are conducive to realize the bottom-tau Yukawa unification which appears in the GUT models. On the other hand, there are problems for realizing favorable sfermion masses in the constrained minimal supersymetric standard model. To resolve these problems, we show that two non-universalities, the non-universal sfermion masses and the non-universal gaugino masses, are favorable.

   hep-phhep-exPRD(2019)·34 citations
5. 05*

   Generalized quasi parton distributions in a diquark spectator model

   Shohini Bhattacharya🇺🇸 · Christopher Cocuzza🇺🇸 · Andreas Metz🇺🇸

   Recently the concept of quasi parton distributions (quasi-PDFs) for hadrons has been proposed. Quasi-PDFs are defined through spatial correlation functions and as such can be computed numerically using quantum chromodynamics on a four-dimensional lattice. As the hadron momentum is increased, the quasi-PDFs converge to the corresponding standard PDFs that appear in factorization theorems for many high-energy scattering processes. Here we investigate this new concept in the case of generalized parton distributions (GPDs) by calculating the twist-2 vector GPDs in the scalar diquark spectator model. For infinite hadron momentum, the analytical results of the quasi-GPDs agree with those of the standard GPDs. Our main focus is to examine how well the quasi-GPDs agree with the standard GPDs for finite hadron momenta. We also study the sensitivity of the results on the parameters of the model. In general, our model calculation suggests that quasi-GPDs could be a viable tool for getting information about standard GPDs.

   hep-phhep-latPLB(2019)·62 citations
6. 06*

   Inverse seesaw mechanism with compact supersymmetry: enhanced naturalness and light super-partners

   Valentina De Romeri🇪🇸 · Ketan M. Patel🇮🇳 · Jose W. F. Valle🇪🇸

   We consider the supersymmetric inverse seesaw mechanism for neutrino mass generation within the context of a low energy effective theory where supersymmetry is broken geometrically in an extra dimensional theory. It is shown that the effective scale characterizing the resulting compact supersymmetric spectrum can be as low as 500-600 GeV for moderate values of $\tan \beta$. The potentially large neutrino Yukawa couplings, naturally present in inverse seesaw schemes, enhance the Higgs mass and allow the super-partners to be lighter than in compact supersymmetry without neutrino masses. The inverse seesaw structure also implies a novel spectrum profile and couplings, in which the lightest supersymmetric particle can be an admixture of isodoublet and isosinglet sneutrinos. Dedicated collider as well as dark matter studies should take into account such specific features.

   hep-phPRD(2018)·3 citations
7. 07*

   Signatures of new physics versus the ridge phenomenon in hadron-hadron collisions at the LHC

   Miguel-Angel Sanchis-Lozano🇪🇸 · Edward K. Sarkisyan-Grinbaum🇨🇭

   In this paper, we consider the possibility that a new stage of matter, stemming from hidden/dark sectors beyond the Standard Model, to be formed in $pp$ collisions at the LHC, can significantly modify the correlations among final-state particles. In particular, two-particle azimuthal correlations are studied by means of a Fourier series sensitive to the near-side ridge effect while assuming that hidden/dark particles decay on top of the conventional parton shower. Then, new (fractional) harmonic terms should be included in the Fourier analysis of the azimuthal anisotropies, encoding the hypothetical new physics contribution enabling its detection in a complementary way to other signatures.

   hep-phhep-exMDPI Physics(2019)·1 citation
8. 08*

   Heavy Higgs boson decays in the alignment limit of the 2HDM

   Bohdan Grzadkowski🇵🇱 · Howard E. Haber🇺🇸 · Odd Magne Ogreid🇳🇴 · Per Osland🇳🇴

   The Standard Model (SM)-like couplings of the observed Higgs boson impose strong constraints on the structure of any extended Higgs sector. We consider the theoretical properties and the phenomenological implications of a generic two Higgs doublet model (2HDM). This model constitutes a simple and attractive extension of the SM that is consistent with the observation of the SM-like Higgs boson and precision electroweak observables, while providing a potential new source of CP-violation. In this paper we focus on the so-called Higgs alignment limit of the generic 2HDM, where the neutral scalar field~$H_1$, with the tree-level couplings of the SM Higgs boson, is a mass eigenstate that is aligned in field space with the direction of the Higgs vacuum expectation value. The properties of the two other heavier neutral Higgs scalars, $H_2$ and $H_3$, in the alignment limit of the 2HDM are also elucidated. It is shown that the couplings of $H_2$ and $H_3$ in the alignment limit are tightly constrained and correlated. For example, in the exact alignment limit at tree level, for bosonic final states $\text{BR}(H_{2,3}\to W^{+}{W}^{-},ZZ,H_{1}Z)=0$ and $\text{BR}(H^{\pm }\to W^{\pm }{H}_1)=0$, whereas for fermionic final states $\Gamma (H_2\to f\bar{f})/\Gamma (H_3\to f\bar{f})\sim M_2/M_3$ (where $M_{\alpha }$ is the mass of $H_{\alpha }$). In some cases, the results of the alignment limit differ depending on whether or not alignment is achieved via the decoupling of heavy scalar states. In particular, in the exact alignment limit without decoupling $\text{BR}(H_{2,3}\to H_1{H}_1)=0$, whereas these branching ratios are nonzero in the decoupling regime. Observables that could be used to test the alignment scenario at the LHC are defined and discussed. The couplings of the Higgs bosons away from their exact alignment values are determined to leading order, and some consequences are elucidated.

   hep-phJHEP(2018)·49 citations
9. 09*

   B-anomalies related to leptons and lepton flavour violation: new directions in model building

   Ferruccio Feruglio🇮🇹

   B-decays mediated by both charged currents and neutral currents have provided hints of violation of lepton flavour universality. By assuming an explanation of these anomalies in terms of new physics at the TeV scale affecting the third fermion generation, we review the relevant constraints. In particular we illustrate the effects of electroweak radiative corrections and their impact on a consistent interpretation of the data. The simplest scenario is ruled out and we briefly discuss the modifications required to simultaneously describe the whole set of anomalies.

   hep-phPoS(2018)·5 citations
10. 10*

    The NNLO QCD analysis of gluon distribution function at small-x

    Mayuri Devee🇮🇳 · J. K. Sarma🇮🇳

    A next-to-next-to-leading order (NNLO) QCD calculation of gluon distribution function at small-x is presented. The gluon distribution function is explored analytically in the DGLAP approach by a Taylor expansion at small x as two first order partial differential equations in two variables : Bjorken x and t (t = ln(Q2/{\Lambda}2) ). We have solved the system of equations at LO, NLO and NNLO respectively by the La- granges method. The resulting analytical expressions are compared with the available global PDF sets as well as with the results of the BDM model. We have further performed a ḩi}2 test to check the com- patibility of our predictions and observed that our results can be consistently described in the context of perturbative QCD. A comparative analysis of the obtained results at LO, NLO and NNLO reveals that the NNLO approximation has a significant contribution to the gluon distribution function particularly in the small-x region.

    hep-phInt.J.Mod.Phys.A(2022)·1 citation
11. 11*

    Testing scalar versus vector dark matter

    Duarte Azevedo🇵🇹 · Mateusz Duch🇵🇱 · Bohdan Grzadkowski🇵🇱 · Da Huang🇵🇱 · Michal Iglicki🇵🇱 · Rui Santos🇵🇹

    We investigate and compare two simple models of dark matter (DM): a vector and a scalar DM model. Both models require the presence of two physical Higgs bosons $h_1$ and $h_2$ which come from mixed components of the standard Higgs doublet $H$ and a complex singlet $S$. In the Vector model, the extra $U(1)$ symmetry is spontaneously broken by the vacuum of the complex field $S$. This leads to a massive gauge boson $X^{\mu }$ that is a DM candidate stabilized by the dark charge conjugation symmetry $S\to S^{\ast }$, $X^{\mu }\to -X^{\mu }$. On the other hand, in the Scalar model the gauge group remains the standard one. The DM field $A$ is the imaginary component of $S$ and the stabilizing symmetry is also the dark charge conjugation $S\to S^{\ast }$ ($A\to -A$). In this case, in order to avoid spontaneous breaking, the $U(1)$ symmetry is broken explicitly, but softly, in the scalar potential. The possibility to disentangle the two models has been investigated. We have analyzed collider, cosmological, DM direct and indirect detection constraints and shown that there are regions in the space spanned by the mass of the non-standard Higgs boson and the mass of the DM particle where the experimental bounds exclude one of the models. We have also considered possibility to disentangle the models at $e^{+}{e}^{-}$ collider and concluded that the process $e^{+}{e}^{-}\to Z+\text{DM}$ provides a useful tool to distinguish the models.

    hep-phPRD(2019)·42 citations
12. 12*

    Single production of composite electrons at the future SPPC-based lepton-hadron colliders

    A. Caliskan🇹🇷

    We consider the production of excited electrons with spin-1/2 at the future SPPC-based electron-proton colliders with center-of-mass energies of $8.4$, $11.6$, $26.6$ and $36.8$ TeV. These exotic particles are predicted in the composite models. We calculate the production cross-sections and concentrate on the photon decay channel of the excited electrons with the process of $ep\to e^{\star }X\to e\gamma X$ . The pseudorapidity and transverse momentum distributions of the electrons and photons in the final-state have been plotted in order to determine the kinematical cuts best suited for discovery of the excited electrons. By applying these cuts we compute $2\sigma$, $3\sigma$ and $5\sigma$ contour plots of the statistical significance of the expected signal in the parameter space ($L$, $m^{\star }$), where $L$ denotes the integrated luminosity of the collider and $m^{\star }$ is the mass of the composite electrons.

    hep-phCan.J.Phys.(2020)·2 citations
13. 13*

    Neutrino effective potential in a fermion and scalar background

    José F. Nieves🇺🇸 · Sarira Sahu🇲🇽

    We consider the neutrino self-energy in a background composed of a scalar particle and a fermion using a simple model for the coupling of the form $\lambda {\bar{f}}_R{\nu }_L\varphi$. The results are useful in the context of Dark Matter-neutrino interaction models in which the scalar and/or fermion constitute the dark-matter. The corresponding formulas for models in which the scalar particle couples to two neutrinos via a coupling of the form ${\lambda }^{(\nu \nu \varphi )}{\bar{\nu }}_R^c{\nu }_L\varphi$ are then obtained as a special case. In the presence of these interactions there can be new contributions to the neutrino effective potential and index of refraction in the context of neutrino collective oscillations in a supernova and in the Early Universe hot plasma before neutrino decoupling. The formulas obtained here can be used to estimate those effects and/or put limits on the model parameters based on the contribution that such interactions can have in those contexts. A particular feature of the results is that the contribution to the neutrino self-energy or effective potential in a neutrino background due to the $\nu \nu \varphi$ coupling is proportional to the antineutrino-neutrino asymmetry $(n_{\bar{\nu }}-n_{\nu })$, in contrast to the standard $Z$ contribution which is proportional to $(n_{\nu }-n_{\bar{\nu }})$. Therefore the two contributions tend to cancel. If the cancellation is significant, it is conceivable that the $O(1/m_{\varphi }^4)$ terms give the dominant contribution. Alternatively, a limit can be set by requiring that the contribution of the $\nu \nu \varphi$ interaction to the neutrino effective potential does not cancel the standard contribution in an appreciable way.

    hep-phPRD(2018)·15 citations
14. 14*

    Determination of ${\alpha }_s$ from static QCD potential with renormalon subtraction

    Hiromasa Takaura🇯🇵 · Takashi Kaneko🇯🇵 · Yuichiro Kiyo🇯🇵 · Yukinari Sumino🇯🇵

    We determine the strong coupling constant ${\alpha }_s(M_Z)$ from the static QCD potential by matching a lattice result and a theoretical calculation. We use a new theoretical framework based on operator product expansion (OPE), where renormalons are subtracted from the leading Wilson coefficient. We find that our OPE prediction can explain the lattice data at ${\Lambda }_{\mathrm{QCD}}r\lesssim 0.8$. This allows us to use a larger window in matching, which leads to a more reliable determination. We obtain ${\alpha }_s(M_Z)=0.1179_{-0.0014}^{+0.0015}$.

    hep-phhep-latPLB(2019)·32 citations
15. 15*

    Determination of ${\alpha }_s$ from static QCD potential: OPE with renormalon subtraction and lattice QCD

    Hiromasa Takaura🇯🇵 · Takashi Kaneko🇯🇵 · Yuichiro Kiyo🇯🇵 · Yukinari Sumino🇯🇵

    We determine the strong coupling constant ${\alpha }_s$ from the static QCD potential by matching a theoretical calculation with a lattice QCD computation. We employ a new theoretical formulation based on the operator product expansion, in which renormalons are subtracted from the leading Wilson coefficient. We remove not only the leading renormalon uncertainty of $\mathcal{O}({\Lambda }_{\mathrm{QCD}})$ but also the first $r$-dependent uncertainty of $\mathcal{O}({\Lambda }_{\mathrm{QCD}}^3{r}^2)$. The theoretical prediction for the potential turns out to be valid at the static color charge distance ${\Lambda }_{\overline{\mathrm{MS}}}r\lesssim 0.8$ ($r\lesssim 0.4$ fm), which is significantly larger than ordinary perturbation theory. With lattice data down to ${\Lambda }_{\overline{\mathrm{MS}}}r\sim 0.09$ ($r\sim 0.05$ fm), we perform the matching in a wide region of $r$, which has been difficult in previous determinations of ${\alpha }_s$ from the potential. Our final result is ${\alpha }_s(M_Z^2)=0.1179_{-0.0014}^{+0.0015}$ with 1.3 % accuracy. The dominant uncertainty comes from higher order corrections to the perturbative prediction and can be straightforwardly reduced by simulating finer lattices.

    hep-phhep-latJHEP(2019)·42 citations
16. 16*

    Top-Yukawa contributions to bbH production at the LHC

    Nicolas Deutschmann🇨🇭 · Fabio Maltoni🇧🇪 · Marius Wiesemann🇨🇭 · Marco Zaro🇳🇱

    We study the production of a Higgs boson in association with bottom quarks ($b\bar{b}H$) in hadronic collisions at the LHC, including the different contributions stemming from terms proportional to the top-quark Yukawa coupling ($y_t^2$), to the bottom-quark one ($y_b^2$), and to their interference ($y_b{y}_t$). Our results are accurate to next-to-leading order in QCD, employ the four-flavour scheme and the (Born-improved) heavy-top quark approximation. We find that next-to-leading order corrections to the $y_t^2$ component are sizable, making it the dominant production mechanism for associated $b\bar{b}H$ production in the Standard Model and increasing its inclusive rate by almost a factor of two. By studying final-state distributions of the various contributions, we identify observables and selection cuts that can be used to select the various components and to improve the experimental sensitivity of $b\bar{b}H$ production on the bottom-quark Yukawa coupling.

    hep-phhep-exJHEP(2019)·40 citations
17. 17*

    Supernova Neutrino Scattering off Gadolinium Even Isotopes in Water Cherenkov Detectors

    Paraskevi C. Divari🇬🇷

    Neutrinos in water can be detected thanks to several reactions. The most important one is the inverse beta decay ${\bar{\nu }}_e+p\to n+e^{+}$ . The detection of 2.2 MeV from neutron capture on free protons is very difficult. The feasibility of Gadolinium (Gd) doping in water Cherenkov detectors essentially reduces background signals and enhances the sensitivity to neutrino detection. In this work, the supernova neutrino charged-current interactions with the most abundant Gd even isotopes (A=156,158 and 160) are studied. We use measured spectra and the quasiparticle random phase approximation to calculate the charged current response of Gd isotopes to supernova neutrinos. Flux-averaged cross sections are obtained considering quasi-thermal neutrino spectra.

    hep-phJCAP(2018)·2 citations
18. 18*

    Calculation of heavy meson potential coefficients by solving Lippman-Schwinger equation

    P Sadeghi Alavijeh🇮🇷 · N Tazimi🇮🇷 · M Monemzadeh🇮🇷

    In the present work, we study meson systems consisting of quark-antiquark. We solve lippman-Schwinger equation numerically for heavy meson systems. We attempt to find a non-relativistic potential model through which we can solve the quark-antiquark bound state problem. The coefficients so obtained are in agreement with Martin potential coefficients. Via this method we also determine the strong coupling constant for the mesons tt, tc, and tb, which is a coefficient of Cornell potential.

    hep-ph0 citations
19. 19*

    Pgg TMD splitting function in kT factorization

    A. Kusina🇵🇱 · M. Hentschinski🇲🇽 · K. Kutak🇵🇱 · M. Serino🇮🇱

    We calculate the transverse momentum dependent gluon-to-gluon splitting function within kT-factorization [EPJC 78 (2018) 174], generalizing the framework of [NPB 175 (1980) 27; NPB 427 (1994) 475] and extending our previous works [JHEP 01 (2016) 181; PRD 94 (2016) 114013] for the quark splittings. While existing versions of kT factorized evolution equations contain already a gluon-to-gluon splitting function i.e. the leading order BFKL kernel or the CCFM kernel, the obtained splitting function has the important property that it reduces to the leading order BFKL kernel in the low z limit, to the DGLAP gluon-to-gluon splitting function in the collinear limit as well as to the CCFM kernel in the angular ordered region.

    hep-phPoS(2018)·1 citation
20. 20*

    Distinctive Collider Signals for a Two Higgs Triplet Model

    Dilip Kumar Ghosh🇮🇳 · Nivedita Ghosh🇮🇳 · Biswarup Mukhopadhyaya🇮🇳

    The extension of the Standard Model (SM) with two complex $SU(2{)}_L$ scalar triplets enables one to have the Type II seesaw mechanism operative consistently with texture-zero neutrino mass matrices. This framework predicts additional doubly charged, singly charged and neutral spinless states. We show that, for certain values of the model parameters, there is sufficient mass splitting between the two doubly charged states ( $H_1^{\pm \pm },H_2^{\pm \pm }$) that allows the decay $H_1^{\pm \pm }\to H_2^{\pm \pm }h$, and thus leads to a unique signature of this scenario. We show that the final state $2({\ell }^{\pm }{\ell }^{\pm })+4b+\text{mET}$ arising from this mode can be observed at the high energy, high luminosity (HE-HL) run of the 14 TeV Large Hadron Collider (LHC), and also at a 100 TeV Future Circular Collider (FCC-hh).

    hep-phPRD(2019)·11 citations
21. 21*

    Quark mass function at finite temperature in real-time formalism

    Hidekazu Tanaka🇯🇵 · Shuji Sasagawa🇯🇵

    We investigate properties of quark mass functions at finite temperature in quantum chromodynamics calculated by Schwinger-Dyson equation in real-time formalism without the instantaneous exchange approximation, in which one-loop integration is performed in Minkowski space. In our model, an imaginary part of the mass function is directory evaluated.

    hep-phPTEP(2019)·1 citation
22. 22*

    Multiplicity Dependence of J/$\psi$ Production and QCD Dynamics in $p+p$ Collisions at $\sqrt{s}$ = 13 TeV

    Suman Deb🇮🇳 · Dhananjaya Thakur🇮🇳 · Sudipan De🇮🇳 · Raghunath Sahoo🇮🇳

    In inelastic $p+p$ collisions, the interacting objects are quarks and gluons (partons). It is believed that there are multiple interactions between the partons in a single $p+p$ event. Recent studies of multiplicity dependence of particle production in $p+p$ collisions have gathered considerable interest in the scientific community. According to several theoretical calculations, multiple gluon participation in hadronic collisions is the cause of high-multiplicity events. If the interaction is hard enough (large $p_{\mathrm{T}}$ transfer), the semi-hard processes of multiple interactions of partons might also lead to production of heavy particles like J/$\psi$. At the LHC, an approximately linear increase of the relative J/$\psi$ yield with charged particle multiplicity is observed in $p+p$ collisions. In the present work, we have studied the contribution of quarks and gluons to the multiplicity dependence of J/$\psi$ production using pQCD inspired event generator, PYTHIA8 tune 4C, in $p+p$ collisions at $\sqrt{s}=$13 TeV by investigating relative J/$\psi$ yield and relative $⟨p_{\mathrm{T}}⟩$ of J/$\psi$ as a function of charged particle multiplicity for different hard-QCD processes. We have estimated a newly defined ratio, $r_{pp}={⟨p_{\mathrm{T}}^2⟩}_i/{⟨p_{\mathrm{T}}^2⟩}_{\mathrm{MB}}$, to understand J/$\psi$ production in high-multiplicity $p+p$ collisions. For the first time we attempt to study the nuclear modification factor like observables ($R_{\mathrm{pp}}$ and $R_{\mathrm{cp}}$) to understand the QCD medium formed in high-multiplicity $p+p$ collisions.

    hep-phhep-exEPJA(2020)·10 citations
23. 23*

    Dark Matter near gravitating bodies

    H. B. Tran Tan🇦🇺 · V. V. Flambaum🇦🇺 · J. C. Berengut🇦🇺

    In this paper, we show that in the vicinity of certain astronomical bodies, e.g., a Neutron Star, a Black Hole, there exist significant enhancements of Dark Matter's density and current, due to its interaction with the gravitational field of the bodies. This enhancement implies that the effects of Dark Matter - Normal Matter interactions are enhanced and hence might be observable.

    hep-ph1 citation
24. 24*

    Phase diagram of two-color QCD matter at finite baryon and axial isospin densities

    Jingyi Chao🇨🇳

    We study the two-color QCD matter within two fundamental quark flavors via both chiral perturbation theory and Nambu--Jona-Lasinio model methods. The effective Lagrangian described by low lying meson and baryon, i.e., diquark, is derived, where the excitations locate in the extended $\mathrm{SU}(4)$ flavor symmetry space. We determine the leading order terms on the dependence of the baryon and axial isospin densities. Then, the two-color NJL model is employed to run the numerical simulation and the phase diagram in the plane of $\mu -{\nu }_5$ is plotted.

    hep-phhep-thnucl-thCPC(2020)·13 citations
25. 25*

    Quark matter under rotation in the NJL model with vector interaction

    Xinyang Wang🇨🇳 · Minghua Wei🇨🇳 · Zhibin Li🇨🇳 · Mei Huang🇨🇳

    We study the chiral phase transition of quark matter under rotation in two-flavor Nambu--Jona-Lasinio (NJL) model. It is found that, in the rotating frame, the angular velocity plays the similar role as the baryon chemical potential and suppresses the chiral condensate, thus the chiral phase transition shows a critical end point not only in the temperature-chemical potential $T-\mu$ plane, but also in the temperature-angular momentum $T-\omega$ plane. One interesting observation is that in the $T-\mu$ plane, the presence of the angular momentum only shifts down the critical temperature $T^E$ of the CEP and does not shift the critical chemical potential ${\mu }^E$, and in the $T-\omega$ plane, the increase of the chemical potential only shift down the critical temperature $T^E$ and does not change the critical angular momentum ${\omega }^E$. The phase structure in the $T-\mu$ plane is sensitive to the coupling strength in the vector channel, while the phase structure in $T-\omega$ plane is not. It is also observed that the rotating angular velocity suppresses the kurtosis of the baryon number fluctuations, while it enhances the pressure density, energy density, the specific heat and the sound velocity.

    hep-phnucl-thPRD(2019)·109 citations
26. 26*

    Coupled channels dynamics in the generation of the $\Omega (2012)$ resonance

    R. Pavao🇪🇸 · E. Oset🇪🇸

    We look into the newly observed $\Omega (2012)$ state from the molecular perspective in which the resonance is generated from the $\bar{K}{\Xi }^{\ast }$, $\eta \Omega$ and $\bar{K}\Xi$ channels. We find that this picture provides a natural explanation of the properties of the $\Omega (2012)$ state. We stress that the molecular nature of the resonance is revealed with a large coupling of the $\Omega (2012)$ to the $\bar{K}{\Xi }^{\ast }$ channel, that can be observed in the $\Omega (2012)\to \bar{K}\pi \Xi$ decay which is incorporated automatically in our chiral unitary approach via the use of the spectral function of ${\Xi }^{\ast }$ in the evaluation of the $\bar{K}{\Xi }^{\ast }$ loop function.

    hep-phEPJC(2018)·47 citations
27. 27*

    Deep Inelastic Scattering on a Nucleus using Holography

    Kiminad A. Mamo🇺🇸 · Ismail Zahed🇺🇸

    We consider deep inelastic scattering (DIS) on a nucleus described using a density expansion. In leading order, the scattering is dominated by the incoherent scattering on individual nucleons distributed using the Thomas-Fermi approximation. We use the holographic structure functions for DIS scattering on single nucleons to make a non-perturbative estimate of the nuclear structure function in leading order in the density. Our results are compared to the data in the large-x regime.

    hep-phhep-thnucl-thPRD(2019)·5 citations
28. 28*

    Updating m_c,b(m_c,b) from SVZ-Moments and their Ratios

    Stephan Narison · LUPM-CNRS-Montpellier (FR)

    Using recent values of \alpha_s, the gluon condensates <\alpha_s G^2> and <g^3 f_abcG^3> and the new data on the \psi/\Upsilon-families, we update our determinations of the MS-bar running quark masses m_c,b(m_c,b) from the SVZ-Moments M_n(Q^2) and their ratios by including higher order perturbative (PT) corrections, non-perturbative (NPT) terms up to dimension d=8 and using the degree n-stability criteria of the (ratios of) moments. Optimal results from different (ratios of) moments converge to the accurate mean values: m_c(m_c)=1264(6) MeV} and m_b(m_b)=4188(8) MeV in Table 4, which improve and confirm our previous findings [1,2] and the recent ones from Laplace sum rules [3]. Comments on some other determinations of m_c(m_c) and <\alpha_s G^2> from the SVZ-(ratios of) moments in the vector channel are given in Section 5.

    hep-phhep-exhep-latPLB(2018)·21 citations
29. 29*

    Interplay of Scalar and Fermionic Components in a Multi-component Dark Matter Scenario

    Sreemanti Chakraborti🇮🇳 · Poulose Poulose🇮🇳

    We explore the multi-component dark matter (DM) scenario considered in a simple extension of the standard model with an inert scalar doublet and a singlet fermionic field providing the two DM candidates. The DM states are made stable under the unbroken $Z_2\times Z_2^{\prime }$ discrete symmetry. An additional gauge singlet scalar field is introduced to facilitate the interaction of the dark fermion with the visible sector. Presence of a charged fermionic field having the same $Z_2$ charge as that of the inert scalar field allows exploring the dark matter mass regions otherwise disallowed, like in the standard Inert Doublet Model (IDM) scenarios. With these arrangements, it is shown that the light DM scenario and the desert region in the intermediate mass range of DM in the standard IDM case can be made compatible with the relic density bounds and direct detection limits. Further, detailed parameter space study is carried out keeping the coexistence of both the scalar and fermionic components in focus, showing that sizable parameter space regions are available for the entire mass range of $10\mathrm{GeV}\le {\mathrm{M}}_{\mathrm{DM}}\le 2000$ GeV.

    hep-phEPJC(2019)·28 citations
30. 30*

    Generation of baryon asymmetry in the E6CHM

    R. Nevzorov🇷🇺 · A. W. Thomas🇦🇺

    The strongly interacting sector in the E6 inspired composite Higgs model (E6CHM) with baryon number violation possesses SU(6)\times U(1)_L global symmetry. In the weakly-coupled sector of this model the U(1)_L symmetry associated with lepton number conservation is broken down to a Z^L_2 discrete symmetry, which stabilizes the proton. Near the scale f > 10 TeV the SU(6) symmetry is broken down to its SU(5) subgroup, giving rise to a set of pseudo-Nambu-Goldstone bosons (pNGBs) that involves the SM-like Higgs doublet, a scalar coloured triplet and a SM singlet boson. Because f is so high, all baryon number violating operators are sufficiently strongly suppressed. Nevertheless, in this variant of the E6CHM the observed matter-antimatter asymmetry can be induced if CP is violated. The pNGB scalar coloured triplet plays a key role in this process and leads to a distinct signature that may be detected at the LHC in the near future.

    hep-phEPJ Web Conf.(2018)·5 citations
31. 31*

    The strange side of LHCb

    Martino Borsato🇪🇸 · Vladimir Gligorov🇫🇷 · Diego Guadagnoli🇫🇷 · Diego Martinez Santos🇪🇸 · Olcyr Sumensari🇮🇹

    We provide general effective-theory arguments relating present-day discrepancies in semi-leptonic $B$-meson decays to signals in kaon physics, in particular lepton-flavour violating ones of the kind $K\to (\pi )e^{\pm }{\mu }^{\mp }$. We show that $K$-decay branching ratios of around $10^{-12}-10^{-13}$ are possible, for effective-theory cutoffs around $5-15$ TeV compatible with discrepancies in $B\to K^{(\ast )}\mu \mu$ decays. We perform a feasibility study of the reach for such decays at LHCb, taking $K^{+}\to {\pi }^{+}{\mu }^{\pm }{e}^{\mp }$ as a benchmark. In spite of the long lifetime of the $K^{+}$ compared to the detector size, the huge statistics anticipated as well as the overall detector performance translate into encouraging results. These include the possibility to reach the $10^{-12}$ ballpark, and thereby significantly improve current limits. Our results advocate LHC's high-luminosity Upgrade phase, and support analogous sensitivity studies at other facilities. Given the performance uncertainties inherent in the Upgrade phase, our conclusions are based on a range of assumptions we deem realistic on the particle identification performance as well as on the kinematic reconstruction thresholds for the signal candidates.

    hep-phhep-exPRD(2019)·24 citations
32. 32*

    A dimension five Lorentz-violating nonminimal coupling for mesons in the KLZ model

    Victor E. Mouchrek-Santos🇧🇷 · Manoel M. Ferreira Jr🇧🇷 · Carlisson Miller🇧🇷

    We investigate a dimension five Lorentz-violating (LV) nonminimal coupling between the neutral vector meson field strength and the pion current in the context of the Kroll-Lee-Zumino (KLZ) model. In this modified model we study the vector meson dominance (VMD) through of the imposing of new universality conditions between the couplings that comes from LV contributions. We also show that the LV nonminimal coupling leads to a linear momentum dependence in the timelike pion form factor, that is used to evaluate LV corrections for the muon anomalous magnetic moment. The experimental imprecision of such quantity allows us to obtain upper bound $\bar{g}{\xi }_0<1.0{\mathrm{GeV}}^{-1}.$ In addition, we also use the LV nonminimal coupling in the KLZ model to recalculate the $\rho$ decay rate. In this case the experimental imprecision is used to constrain the magnitude of the LV parameter at the level of $\bar{g}{\xi }_0<1.9\times 10^{-2}{\mathrm{GeV}}^{-1}$.

    hep-phhep-thNPB(2019)·6 citations
33. 33*

    Freezing-in the Hierarchy Problem

    Timothy Cohen🇺🇸 · Raffaele Tito D'Agnolo🇺🇸 · Matthew Low🇺🇸

    Models with a tiny coupling $\lambda$ between the dark matter and the Standard Model, $\lambda \sim v/M_{\text{Pl}}\sim 10^{-16}$, can yield the measured relic abundance through the thermal process known as freeze-in. We propose to interpret this small number in the context of perturbative large $N$ theories, where couplings are suppressed by inverse powers of $N$. Then $N\sim M_{\mathrm{Pl}}^2/v^2$ gives the observed relic density. Additionally, the ultimate cutoff of the Standard Model is reduced to $\sim 4\pi M_{\text{Pl}}/\sqrt{N}\sim 4\pi v$, thereby solving the electroweak hierarchy problem. These theories predict a direct relation between the Standard Model cutoff and the dark matter mass, linking the spectacular collider phenomenology associated with the low gravitational scale to the cosmological signatures of the dark sector. The dark matter mass can lie in the range from hundreds of keV to hundreds of GeV. Possible cosmological signals include washing out power for small scale structure, indirect detection signals from dark matter decays, and a continuous injection of electromagnetic and hadronic energy throughout the history of the Universe.

    hep-phhep-thPRD(2019)·12 citations
34. 34*

    Neutrino Telescopes as QCD Microscopes

    Valerio Bertone🇳🇱 · Rhorry Gauld🇨🇭 · Juan Rojo🇳🇱

    We present state-of-the-art predictions for the ultra-high energy (UHE) neutrino-nucleus cross-sections in charged- and neutral-current scattering. The calculation is performed in the framework of collinear factorisation at NNLO, extended to include the resummation of small-$x$ BFKL effects. Further improvements are made by accounting for the free-nucleon PDF constraints provided by $D$-meson data from LHCb and assessing the impact of nuclear corrections and heavy-quark mass effects. The calculations presented here should play an important role in the interpretation of future data from neutrino telescopes such as IceCube and KM3NET, and highlight the opportunities that astroparticle experiments offer to study the strong interactions.

    hep-phastro-ph.HEJHEP(2019)·135 citations
35. 35*

    Type-II 2HDM under the Precision Measurements at the $Z$-pole and a Higgs Factory

    Ning Chen🇨🇳 · Tao Han🇺🇸 · Shufang Su🇺🇸 · Wei Su🇺🇸 · Yongcheng Wu🇨🇦

    Future precision measurements of the Standard Model (SM) parameters at the proposed $Z$-factories and Higgs factories may have significant impacts on new physics beyond the Standard Model in the electroweak sector. We illustrate this by focusing on the Type-II two Higgs doublet model (Type-II 2HDM). The contributions from the heavy Higgs bosons at the tree-level and at the one-loop level are included in a full model parameter space. We perform a multiple variable global fit and study the extent to which the parameters of non-alignment and non-degenerate masses can be probed by the precision measurements. We find that the allowed parameter ranges are tightly constrained by the future Higgs precision measurements, especially for small and large values of $\tan \beta$. Indirect limits on the masses of heavy Higgs can be obtained, which can be complementary to the direct searches of the heavy Higgs bosons at hadron colliders. We also find that the expected accuracies at the $Z$-pole and at a Higgs factory are quite complementary in constraining mass splittings of heavy Higgs bosons. The typical results are $|\cos (\beta -\alpha )|<0.008,|\Delta m_{\Phi }|<200\mathrm{GeV}$, and $\tan \beta \sim 0.2-5$. The reaches from CEPC, FCC-ee and ILC are also compared, for both Higgs and $Z$-pole precision measurements.

    hep-phJHEP(2019)·51 citations
36. 36*

    Radial Flow and Differential Freeze-out in Proton-Proton Collisions at $\sqrt{s}=7$ TeV at the LHC

    Arvind Khuntia🇮🇳 · Himanshu Sharma🇮🇳 · Swatantra Kumar Tiwari🇮🇳 · Raghunath Sahoo🇮🇳 · Jean Cleymans🇿🇦

    We analyse the transverse momentum ($p_{\mathrm{T}}$)-spectra as a function of charged-particle multiplicity at midrapidity ($|y|<0.5$) for various identified particles such as ${\pi }^{\pm }$, $K^{\pm }$, $K_S^0$, $p+\overline{p}$, $\varphi$, $K^{\ast 0}+\overline{K^{\ast 0}}$, and $\Lambda$ + $\bar{\Lambda }$ in proton-proton collisions at $\sqrt{s}$ = 7 TeV using Boltzmann-Gibbs Blast Wave (BGBW) model and thermodynamically consistent Tsallis distribution function. We obtain the multiplicity dependent kinetic freeze-out temperature ($T_{\mathrm{kin}}$) and radial flow ($\beta$) of various particles after fitting the $p_{\mathrm{T}}$-distribution with BGBW model. Here, $T_{\mathrm{kin}}$ exhibits mild dependence on multiplicity class while $\beta$ shows almost independent behaviour. The information regarding Tsallis temperature and the non-extensivity parameter ($q$) are drawn by fitting the $p_{\mathrm{T}}$-spectra with Tsallis distribution function. The extracted parameters of these particles are studied as a function of charged particle multiplicity density ($d{N}_{ch}/d\eta$). In addition to this, we also study these parameters as a function of particle mass to observe any possible mass ordering. All the identified hadrons show a mass ordering in temperature, non-extensive parameter and also a strong dependence on multiplicity classes, except the lighter particles. It is observed that as the particle multiplicity increases, the $q$-parameter approaches to Boltzmann-Gibbs value, hence a conclusion can be drawn that system tends to thermal equilibrium. The observations are consistent with a differential freeze-out scenario of the produced particles.

    hep-phhep-exnucl-exnucl-thEPJA(2019)·48 citations
37. 37*

    Finite temperature Schwinger pair production in coexistent electric and magnetic fields

    Mrunal Korwar🇮🇳 · Arun M. Thalapillil🇮🇳

    We compute Schwinger pair production rates at finite temperature, in the presence of homogeneous, concurrent electric and magnetic fields. Expressions are obtained using the semiclassical worldline instanton formalism, to leading order, for spin-$0$ and spin-$\frac{1}{2}$ particles. The derived results are valid for weak coupling and fields. We thereby extend previous seminal results in the literature, to coexistent electric and magnetic fields, and fermions.

    ↳ hep-thastro-ph.HEhep-exhep-phPRD(2018)·18 citations
38. 38*

    Observational Constraints on Constant Roll Inflation

    Jose T. Galvez Ghersi🇨🇦 · Alex Zucca🇨🇦 · Andrei V. Frolov🇨🇦

    Constant-roll inflation was recently introduced by Motohashi, Starobinsky and Yokoyama as a phenomenological way to parametrize deviations from the slow-roll scenarios. In this paper, we investigate the dynamics of both the background and the perturbations in this model, without making any slow-roll assumptions. The perturbation spectra are computed with an efficient and accurate novel method that allowed us to quickly scan the parameter space of constant-roll inflation. We derive the constraints on the model parameters from the cosmic microwave background anisotropy measurements provided by the joint analysis of the Planck Collaboration and the BICEP2/Keck Array data.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2019)·34 citations
39. 39*

    Undressing Confining Flux Tubes with $T\bar{T}$

    Chang Chen🇺🇸 · Peter Conkey🇺🇸 · Sergei Dubovsky🇺🇸 · Guzman Hernandez-Chifflet🇺🇸

    Lattice QCD simulations provide crucial information about the worldsheet dynamics of confining strings (flux tubes). An accurate extraction of the worldsheet $S$-matrix from lattice spectra requires accounting for polarization effects. Approximate integrability of the low energy worldsheet theory makes it possible to apply the Thermodynamic Bethe Ansatz to incorporate polarization effects at all orders in the number of windings and at the leading order in the derivative expansion. However, a systematic application of this technique in the presence of non-integrable effects and for multiparticle states becomes increasingly challenging. We point out that a recently understood equivalence between gravitational dressing and $T\bar{T}$ deformation provides a fully systematic and straightforward recipe to incorporate the leading polarization effects in the presence of an arbitrary inelasticity and for any number of particles. We illustrate this technique with several examples.

    ↳ hep-thhep-lathep-phPRD(2018)·45 citations
40. 40*

    Compact objects as the catalysts for vacuum decays

    Naritaka Oshita🇯🇵 · Masaki Yamada🇺🇸 · Masahide Yamaguchi🇯🇵

    We discuss vacuum decays catalyzed by spherical and horizonless objects and show that an ultra compact object could catalyze a vacuum decay around it within the cosmological time. The catalytic effect of a horizonless compact object could be more efficient than that of a black hole since in this case there is no suppression of the decay rate due to the decrement of its Bekestein entropy. If there exists another minimum with AdS vacuum in the Higgs potential at a high energy scale, the abundance of compact objects such as monopoles, neutron stars, axion stars, oscillons, Q-balls, black hole remnants, gravastars and so on, could be severely constrained. We find that an efficient enhancement of nucleation rate occurs when the size of the compact object is comparable to its Schwarzschild radius and the bubble radius.

    ↳ gr-qcastro-ph.COhep-phhep-thPLB(2019)·43 citations
41. 41*

    Heavy-ion collisions - hot QCD in a lab

    Mateusz Ploskon🇺🇸

    High-energy heavy-ion collisions provide a unique opportunity to study the properties of the hot and dense strongly-interacting system composed of deconfined quarks and gluons -- the quark-gluon plasma (QGP) -- in laboratory conditions. The formation of a QGP is predicted by lattice QCD calculations as a crossover transition from hadronic matter (at zero baryochemical potential) and is expected to take place once the system temperature reaches values above 155 MeV and/or the energy density above $0.5\mathrm{GeV}/{\mathrm{fm}}^3$. The nature of such a strongly coupled QGP has been linked to the early Universe at some microseconds after the Big Bang. To characterize the physical properties of the short-lived matter (lifetime of about $10\mathrm{fm}/c$) experimental studies at Relativistic Heavy-Ion Collider and the Large Hadron collider use auto-generated probes, such as high-energy partons created early in the hadronic collisions, thermally emitted photons, and a set of particle correlations that are sensitive to the collective expansion and the dynamics of the system. The lectures briefly introduced some of the experimental techniques and provided a glimpse at some of the results.

    ↳ hep-exhep-phnucl-exnucl-th10 citations
42. 42*

    Median Statistics Analysis of Deuterium Abundance Measurements and Spatial Curvature Constraints

    Jarred Penton🇺🇸 · Jacob Peyton🇺🇸 · Aasim Zahoor🇺🇸 · Bharat Ratra🇺🇸

    Zavarygin et al. (2018) compiled a list of 15 deuterium abundance measurements, discarded two because the remaining 13 measurements are then consistent with gaussianity, and found that the weighted mean baryon density (Omega_b h^2) determined from the 13 measurements is mildly discrepant (1.6sigma) with that determined from the Planck 2015 cosmic microwave background anisotropy data in a flat cosmogony. We find that a median statistic central estimate of Omega_b h^2 from all 15 deuterium abundance measurements is a more accurate estimate, is very consistent with Omega_b h^2 estimated from Planck 2015 data in a flat cosmogony, but is about 2sigma lower than that found in a closed cosmogonical model from the Planck 2015 data.

    ↳ astro-ph.COgr-qchep-phPubl.Astron.Soc.Pac.(2018)·19 citations
43. 43*

    Luminosity constraint and entangled solar neutrino signals

    Francesco Vissani🇮🇹

    The current frontier of solar neutrino physics is the observation of CNO neutrinos. The signals of CNO and PP neutrinos are however entangled: In fact, the pp-flux can be known precisely only if CNO-flux is quantified; the interpretation of the gallium experiments depends upon both fluxes; a precise knowledge of pep-flux is a precondition to extract the CNO-neutrino signal with Borexino. The luminosity constraint plays an increasingly important rôle: we present it in a new form, improving the expression obtained by J. Bahcall in Phys. Rev. C 65 (2002) 025801.

    ↳ astro-ph.SRhep-ph3 citations
44. 44*

    de Sitter Branes in a Flat Bulk of Massive Gravity

    Nemanja Kaloper🇺🇸 · James H.C. Scargill🇺🇸

    We construct de Sitter branes in a flat bulk of massive gravity in $5D$. We find two branches of solutions, reminiscent of the normal and self-accelerating branches in DGP, but with rather different properties. Neither branch has a self-accelerating limit: the background geometry requires having a nonvanishing tension. On the other hand, on both branches there are sub-branches where the leading order contributions of the tension to the curvature cancel. In these cases it turns out that larger tensions curve the background less. Further, both branches support a localized $4D$ massless graviton for a special choice of bulk mass terms. This choice may be protected by enhanced gauge symmetry at least at the linearized level. Finally, we generalize the solutions to the case of bigravity in a flat $5D$ bulk.

    ↳ hep-thastro-ph.COgr-qchep-phJHEP(2019)·4 citations
45. 45*

    Draining the Swampland

    Ido Ben-Dayan🇮🇱

    We discuss some implications of the recently suggested Swampland conjecture $\frac{|\nabla V|}{V}\gtrsim c\sim 1$, together with a previous one $\Delta \varphi \lesssim 1$. We list some implications for particle phenomenology and the Early Universe. The most intriguing implication of the conjecture could be a significant shift in allowed inflationary models, if not ruling out slow-roll (single field) inflation altogether. The tension of inflation and the conjecture does not only regard the amplitude of the tensor spectrum, but also its tilt, as $c\gtrsim 1$ implies both a yet unobserved tensor to scalar ratio, and an enhancement of the observed scalar power spectrum on large scales in discord with current data that favors a suppression on these scales. Scalar fields are abundant in theories of quantum gravity. Considering a second scalar field, its dynamics are dictated by the relation between its mass, $m$, and the Hubble parameter, $H$, at different epochs in the history of the Universe. This scalar field, a drainon, fulfills the conjecture draining up the swampland. For Inflation, this drainon requires a modest hierarchy compared to the inflaton. For the rest of the thermal history of the Universe, the drainon can be a coherently oscillating scalar field strengthening the case of Dark Matter candidates of that sort.

    ↳ hep-thastro-ph.COgr-qchep-phPRD(2019)·72 citations
46. 46*

    Charged gravitational instantons: extra CP violation and charge quantisation in the Standard Model

    Suntharan Arunasalam🇦🇺 · Archil Kobakhidze🇦🇺

    We argue that quantum electrodynamics combined with quantum gravity results in a new source of CP violation, anomalous non-conservation of chiral charge and quantisation of electric charge. Further phenomenological and cosmological implications of this observation are briefly discussed within the standard model of particle physics and cosmology

    ↳ hep-thgr-qchep-phEPJC(2019)·11 citations
47. 47*

    On Wigner function of a vortex electron

    Dmitry Karlovets🇷🇺

    We derive a relatively simple and Lorentz-invariant expression for a Wigner function of a paraxial vortex electron described as a Laguerre-Gaussian wave packet.

    ↳ quant-phhep-phJ.Phys.A(2019)·10 citations
48. 48*

    Cooling of neutron stars in "nuclear medium cooling scenario" with stiff equation of state including hyperons

    Hovik Grigorian🇷🇺 · Dmitry N. Voskresensky🇷🇺 · Konstantin A. Maslov🇷🇺

    We demonstrate that the existing neutron-star cooling data can be appropriately described within "the nuclear medium cooling scenario" including hyperons under the assumption that different sources have different masses. We use a stiff equation of state of the relativistic mean-field model MKVORH$\varphi$ with hadron effective couplings and masses dependent on the scalar field. It fulfills a large number of experimental constraints on the equation of state of the nuclear matter including the $2M_{\odot }$ lower bound for the maximum predicted neutron-star mass and the constraint for the pressure from the heavy-ion particle flow. We select appropriate ${}^1{S}_0$ proton and $\Lambda$ hyperon pairing gap profiles from those exploited in the literature and allow for a variation of the effective pion gap controlling the efficiency of the medium modified Urca process. The ${}^3{P}_2$ neutron pairing gap is assumed to be negligibly small in our scenario. The possibility of the pion, kaon and charged $\rho$-meson condensations is for simplicity suppressed. The resulting cooling curves prove to be sensitive to the value and the density dependence of the pp pairing gap and rather insensitive to the values of the ${}^1{S}_0$ neutron pairing gaps.

    ↳ astro-ph.HEhep-phnucl-thNPA(2018)·23 citations
49. 49*

    Axion Miniclusters in Modified Cosmological Histories

    Luca Visinelli🇸🇪 · Javier Redondo🇪🇸

    If the symmetry breaking leading to the origin of the axion dark matter field occurs after the end of inflation and is never restored, then overdensities in the axion field collapse to form dense objects known in the literature as axion miniclusters. The estimates of the typical minicluster mass and radius strongly depend on the details of the cosmology at which the onset of axion oscillations begin. In this work we study the properties and phenomenology of miniclusters in alternative cosmological histories and find that they can change by many orders of magnitude. Our findings have direct implications on current and future experimental searches and, in the case of discovery, could be used to learn something about the universe expansion prior to Big-Bang-Nucleosynthesis.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2020)·94 citations
50. 50*

    Universe's Worth of Electrons to Probe Long-Range Interactions of High-Energy Astrophysical Neutrinos

    Mauricio Bustamante (Bohr Inst.)🇩🇰 · Sanjib Kumar Agarwalla (Bhubaneswar, Inst. Phys. and HBNI, Mumbai and ICTP, Trieste)🇮🇳

    Astrophysical searches for new long-range interactions complement collider searches for new short-range interactions. Conveniently, neutrino flavor oscillations are keenly sensitive to the existence of long-ranged flavored interactions between neutrinos and electrons, motivated by lepton-number symmetries of the Standard Model. For the first time, we probe them using TeV-PeV astrophysical neutrinos and accounting for all large electron repositories in the local and distant Universe. The high energies and colossal number of electrons grant us unprecedented sensitivity to the new interaction, even if it is extraordinarily feeble. Based on IceCube results for the flavor composition of astrophysical neutrinos, we set the ultimate bounds on long-range neutrino flavored interactions.

    ↳ astro-ph.HEhep-exhep-phPRL(2019)·74 citations
51. 51*

    Blue-tilted Primordial Gravitational Waves from Massive Gravity

    Tomohiro Fujita🇯🇵 · Sachiko Kuroyanagi🇯🇵 · Shuntaro Mizuno🇯🇵 · Shinji Mukohyama🇯🇵

    We study a theory of massive tensor gravitons which predicts blue-tilted and largely amplified primordial gravitational waves. After inflation, while their mass is significant until it diminishes to a small value, gravitons are diluted as non-relativistic matter and hence their amplitude can be substantially amplified compared to the massless gravitons which decay as radiation. We show that such gravitational waves can be detected by interferometer experiments, even if their signal is not observed on the CMB scales.

    ↳ gr-qcastro-ph.COhep-phhep-thPLB(2019)·60 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.