Thu·Mar 28, 2019Thursday·March 28, 2019

1. 01*

   Recognizing symmetries in 3HDM in basis-independent way

   Ivo de Medeiros Varzielas🇵🇹 · Igor P. Ivanov🇵🇹

   Higgs doublets may come in three generations. The scalar sector of the resulting three-Higgs-doublet model (3HDM) may be constrained by global symmetry groups $G$ leading to characteristic phenomenology. There exists the full list of symmetry groups $G$ realizable in the 3HDM scalar sector and the expressions for $G$-symmetric scalar potentials written in special bases where the generators of $G$ take simple form. However recognizing the presence of a symmetry in a generic basis remains a major technical challenge, which impedes efficient exploration of the 3HDM parameter space. In this paper, we solve this problem using the recently proposed approach, in which basis-independent conditions are formulated as relations among basis-covariant objects. We develop the formalism and derive basis-independent necessary and sufficient conditions for the 3HDM scalar sector to be invariant under each of the realizable symmetry group. We also comment on phenomenological consequences of these results.

   hep-phPRD(2019)·37 citations
2. 02*

   $R_K$ and $R_{K^{\ast }}$ in an Aligned 2HDM with Right-Handed Neutrinos

   Luigi Delle Rose🇮🇹 · Shaaban Khalil🇪🇬 · Simon J.D. King🇬🇧 · Stefano Moretti🇬🇧

   We consider the possibility to explain the recent $R_K$ and $R_{K^{\ast }}$ anomalies in a 2-Higgs Doublet Model, known as Aligned, combined with a low scale seesaw mechanism generating light neutrino masses and mixings. In this class of models, a large Yukawa coupling allows for significant non-universal leptonic contributions, through box diagrams mediated by charged Higgs bosons and right-handed neutrinos, to the $b\to s{\ell }^{+}{\ell }^{-}$ transition that can then account for both $R_K$ and $R_{K^{\ast }}$ anomalies.

   hep-phPRD(2020)·32 citations
3. 03*

   Towards a way to distinguish between IHDM and the Scotogenic at CLIC

   Ivania Maturana-Ávila🇨🇱 · Marco Aurelio Díaz🇨🇱 · Nicolás Rojas🇨🇱 · Sebastián Urrutia-Quiroga🇺🇸

   A study about the phenomenology of IHDM and Scotogenic model and how the contributions could be very different using the same observable.

   hep-ph3 citations
4. 04*

   Chiral phase transition from the Dyson-Schwinger equations in a finite spherical volume

   Ya-Peng Zhao🇨🇳 · Rui-Rui Zhang🇨🇳 · Han Zhang🇨🇳 · Hong-Shi Zong🇨🇳

   Within the framework of Dyson-Schwinger equations and by means of Multiple Reflection Expansion, we study the finite volume effects on the chiral phase transition in a sphere, especially discuss its influence on the location of the possible critical end point (CEP). According to our calculations, when we take the sphere instead of cube as a research, the influence of finite volume effects on phase transition is not as significant as previously calculated. For instance, as the radius of spherical volume decreases from infinite to $2\mathrm{fm}$, at zero chemical potential and finite temperature, the critical temperature $T_c$ has only a slight drop. And at finite chemical potential and finite temperature, the location of CEP shifts toward smaller temperature and higher chemical potential, but the amplitude of variation does not exceed $20\%$. So we find that not only the size of the volume, but also the shape of the volume will have a considerable impact on the phase transition.

   hep-phCPC(2019)·16 citations
5. 05*

   Electroweak Baryogenesis with Vector-like Leptons and Scalar Singlets

   Nicole F. Bell🇦🇺 · Matthew J. Dolan🇦🇺 · Leon S. Friedrich🇦🇺 · Michael J. Ramsey-Musolf🇺🇸 · Raymond R. Volkas🇦🇺

   We investigate the viability of electroweak baryogenesis in a model with a first order electroweak phase transition induced by the addition of two gauge singlet scalars. A vector-like lepton doublet is introduced in order to provide CP violating interactions with the singlets and Standard Model leptons, and the asymmetry generation dynamics are examined using the vacuum expectation value insertion approximation. We find that such a model is readily capable of generating sufficient baryon asymmetry while satisfying electron electric dipole moment and collider phenomenology constraints.

   hep-phJHEP(2020)·35 citations
6. 06*

   Two-Loop $\mathcal{O}({\alpha }_t^2)$ Corrections to the Neutral Higgs Boson Masses in the CP-Violating NMSSM

   T.N. Dao🇻🇳 · R. Gröber🇩🇪 · M.Krause🇩🇪 · M. Mühlleitner🇩🇪 · H. Rzehak🇩🇰

   We present our calculation of the two-loop corrections of $\mathcal{O}({\alpha }_t^2)$ to the neutral Higgs boson masses of the CP-violating Next-to-Minimal Supersymmetric extension of the Standard Model (NMSSM). The calculation is performed in the Feynman diagrammatic approach in the gaugeless limit at vanishing external momentum. We apply a mixed $\overline{\mathrm{DR}}$-on-shell (OS) renormalization scheme for the NMSSM input parameters. Furthermore, we exploit a $\overline{\mathrm{DR}}$ as well as an OS renormalization in the top/stop sector. The corrections are implemented in the Fortran code NMSSMCALC for the calculation of the Higgs spectrum both in the CP-conserving and CP-violating NMSSM. The code also provides the Higgs boson decays including the state-of-the-art higher-order corrections. The corrections computed in this work improve the already available corrections in NMSSMCALC which are the full one-loop corrections without any approximation and the two-loop $\mathcal{O}({\alpha }_t{\alpha }_s)$ corrections in the gaugeless limit and at vanishing external momentum. Depending on the chosen parameter point, we find that the $\mathcal{O}({\alpha }_t{\alpha }_s+{\alpha }_t^2)$ corrections add about 4-7% to the one-loop mass of the SM-like Higgs boson for $\overline{\mathrm{DR}}$ renormalization in the top/stop sector and they reduce the mass by about 6-9% if OS renormalization is applied. For an estimate of the theoretical uncertainty we vary the renormalization scale and change the renormalization scheme and show that care has to be taken in the corresponding interpretation.

   hep-phJHEP(2019)·29 citations
7. 07*

   Revisiting the radiative decays $J/\psi \to \gamma {\eta }^{(\prime )}$ in perturbative QCD

   Jun-Kang He🇨🇳 · Ya-Dong Yang🇨🇳

   In the framework of perturbative QCD, the radiative decays $J/\psi \to \gamma {\eta }^{(\prime )}$ are revisited in detail, where the involved one-loop integrals are evaluated analytically with the light quark masses kept. We have found that the sum of loop integrals is insensitive to the light quark masses and the branching ratios $\mathcal{B}(J/\psi \to \gamma {\eta }^{(\prime )})$ barely depend on the shapes of ${\eta }^{(\prime )}$ distribution amplitudes. With the parameters of $\eta -{\eta }^{\prime }$ mixing extracted from low energy processes and $J/\psi \to \gamma {\eta }^{(\prime )}$ by means of nonperturbative matrix elements $⟨0|G_{\mu \nu }^a{\tilde{G}}^{a,\mu \nu }|{\eta }^{(\prime )}⟩$ based on $U_A(1)$ anomaly dominance argument, we could not give the ratio $R_{J/\psi }$ in agreement with experimental result. However, using the parameters, especially the mixing angle $\varphi =33.5^{\circ }\pm 0.9^{\circ }$, extracted from ${\gamma }^{\ast }\gamma -{\eta }^{\prime }$ transition form factor measured at $q^2=112{\mathrm{GeV}}^2$ by BaBar collaboration, we obtain $R_{J/\psi }=4.70$ in good agreement with $R_{J/\psi }^{exp}=4.65\pm 0.21$. As a crossing check, with ${\Gamma }^{exp}({\eta }^{(\prime )}\to \gamma \gamma )$ and our results for $J/\psi \to \gamma {\eta }^{(\prime )}$, we get $\varphi =33.9^{\circ }\pm 0.6^{\circ }$. The difference between the determinations of $\varphi$ is briefly discussed.

   hep-phNPB(2019)·10 citations
8. 08*

   Nucleon Structure Functions from the NJL-Model Chiral Soliton

   I. Takyi🇿🇦 · H. Weigel🇿🇦

   We present numerical simulations for unpolarized and polarized structure functions in a chiral soliton model. The soliton is constructed self-consistently from quark fields from which the structure functions are extracted. Central to the project is the implementation of regularizing the Dirac sea (or vacuum) contribution to structure functions from first principles. We discuss in detail how sum rules are realized at the level of the quark wave-functions in momentum space. The comparison with experimental data is convincing for the polarized structure functions but exhibits some discrepancies in the unpolarized case. The vacuum contribution to the polarized structure functions is particularly small.

   hep-phnucl-thEPJA(2019)·5 citations
9. 09*

   Chiral Spin Noncommutative Space and Anomalous Dipole Moments

   Kai Ma🇨🇳

   We introduce a new model of spin noncommutative space in which noncommutative extension of the coordinate operators are assumed to be chirality dependent. Noncommutative correspondences of classical fields are defined via Weyl ordering, and the maps are represented by a spin-dependent translation operator. Based on the maps, gauge field theory in chiral spin noncommutative space is established. The corresponding gauge transformations are induced by a local phase rotation on commutative functions, and hence are consistent with the ordinary gauge transformations by definition. Furthermore, a general extension of the ordering between Dirac matrix and gauge potential is introduced. Noncommutative corrections on equations of motion of matter and gauge fields are studied. We find that there are two kinds of corrections. The first kind of correction involves derivatives of the matter field, and hence contribute the ordinary Noether current. On the other hand, the second kind of correction depends only on derivatives of the gauge fields, and hence contribute anomalous magnetic and electric dipole moments of the matter field. Moreover, experimental bounds on the noncommutative parameters for muon lepton are studied in a simplified model.

   hep-phhep-th3 citations
10. 10*

    Non-collinearity in di-jet fragmentation in electron-positron scattering

    P.J. Mulders🇳🇱 · C. Van Hulse🇪🇸

    We study fragmentation in electron-positron annihilation assuming a di-jet situation, using variables defined independent of any frame. In a collinear situation some of the variables are centered around zero with the small deviations attributed to intrinsic transverse momenta and large deviations attributed to additional hard subprocesses. Of course there is a gradual transition. Our modest goal is to show that covariantly defined variables are well suited to get a feeling for the magnitude of intrinsic transverse momenta.

    hep-phPRD(2019)·7 citations
11. 11*

    Searching for Heavy Charged Higgs Bosons through Top Quark Polarization

    Abdesslam Arhrib🇲🇦 · Adil Jueid🇨🇳 · Stefano Moretti🇬🇧

    We study the production of a heavy charged Higgs boson at the Large Hadron Collider (LHC) in $gb\to H^{-}t$ within a Two Higgs Doublet Model (2HDM). The chiral structure of the $H^{-}t\bar{b}$ coupling can trigger a particular spin state of the top quark produced in the decay of a charged Higgs boson and, therefore, is sensitive to the underlying mechanism of the Electro-Weak Symmetry Breaking (EWSB). Taking two benchmark models (2HDM type-I and 2HDM type-Y) as an example, we show that inclusive rates, differential distributions as well as forward-backward asymmetries of the top quark's decay products can be used to search for heavy charged Higgs bosons as well as a model discriminators.

    hep-phhep-exInt.J.Mod.Phys.A(2020)·6 citations
12. 12*

    Isospin breaking decays as a diagnosis of the hadronic molecular structure of the $P_c(4457)$

    Feng-Kun Guo🇨🇳 · Hao-Jie Jing🇨🇳 · Ulf-G. Meißner🇩🇪 · Shuntaru Sakai🇨🇳

    The LHCb Collaboration announced the observation of three narrow structures consistent with hidden-charm pentaquark states. They are candidates of hadronic molecules formed of a pair of a charmed baryon and an anticharmed meson. Among them, the $P_c(4457)$ mass is consistent with earlier predictions of a ${\Sigma }_c{\bar{D}}^{\ast }$ molecule with $I=1/2$. We point out that if such a picture were true, one would have $\mathcal{B}(P_c(4457)\to J/\psi {\Delta }^{+})/\mathcal{B}(P_c(4457)\to J/\psi p)$ at the level ranging from a few percent to about 30%. Such a large isospin breaking decay ratio is two to three orders of magnitude larger than that for normal hadron resonances. It is a unique feature of the ${\Sigma }_c{\bar{D}}^{\ast }$ molecular model, and can be checked by LHCb.

    hep-phhep-exnucl-thPRD(2019)·149 citations
13. 13*

    The Regge trajectories and leptonic widths of the vector $s\bar{s}$ mesons

    A.M. Badalian🇷🇺 · B.L.G. Bakker🇳🇱

    The spectrum of the $s\bar{s}$ mesons is studied performing a phenomenological analysis of the Regge trajectories defined for the excitation energies. For the $\varphi (3^3{S}_1)$ state the mass $M(\varphi (3S))=2100(20)$ MeV and the leptonic width ${\Gamma }_{ee}(\varphi (3S))=0.27(2)$ keV are obtained, while the mass of the $2^3{D}_1$ state, $M(\varphi (2^3{D}_3))=2180(5)$ MeV, appears to be in agreement with the mass of the $\varphi (2170)$ resonance, and its leptonic width, ${\Gamma }_{ee}(2^3{D}_1)=0.20\pm 0.10$ keV, has a large theoretical uncertainty, depending on the parameters of the flattened confining potential.

    hep-phhep-exFew Body Syst.(2019)·13 citations
14. 14*

    Revisiting the vector leptoquark explanation of the B-physics anomalies

    Claudia Cornella🇨🇭 · Javier Fuentes-Martin🇨🇭 · Gino Isidori🇨🇭

    We present a thorough investigation of the vector leptoquark hypothesis for a combined explanation of the $B$-physics anomalies. We analyze this hypothesis from a twofold perspective, taking into account recent results from $B$-physics observables and high-$p_T$ searches. First, using a simplified model, we determine the general conditions for a successful low-energy fit in presence of right-handed leptoquark couplings (neglected in previous analyses). Second, we show how these conditions, in particular a sizable 2-3 family mixing, can be achieved in a motivated ultraviolet completion. Our analysis reinforces the phenomenological success of the vector leptoquark hypothesis in addressing the anomalies, and its compatibility with motivated extensions of the Standard Model based on the idea of flavor non-universal gauge interactions. The implications of right-handed leptoquark couplings for a series of key low-energy observables, namely $B_s\to \tau \tau$ and $\tau \to \mu$ lepton flavor violating processes, both in $\tau$ and in $B$ decays, are discussed in detail. The role of the ultraviolet completion in precisely estimating other low-energy observables, most notably $\Delta F=2$ amplitudes, is also addressed.

    hep-phJHEP(2019)·217 citations
15. 15*

    Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysis

    Ming-Zhu Liu🇨🇳 · Ya-Wen Pan🇨🇳 · Fang-Zheng Peng🇨🇳 · Mario Sanchez Sanchez🇫🇷 · Li-Sheng Geng🇨🇳 · Atsushi Hosaka🇯🇵 · Manuel Pavon Valderrama🇨🇳

    A recent analysis by the LHCb collaboration suggests the existence of three narrow pentaquark-like states --- the $P_c(4312)$,$P_c(4440)$ and $P_c(4457)$ --- instead of just one in the previous analysis (the $P_c(4450)$). The closeness of the $P_c(4312)$ to the $\bar{D}{\Sigma }_c$ threshold and the $P_c(4440)$/$P_c(4457)$ to the ${\bar{D}}^{\ast }{\Sigma }_c$ one suggests a molecular interpretation of these resonances. We show that these three pentaquark-like resonances can be naturally accommodated in a contact-range effective field theory description that incorporates heavy-quark spin symmetry. This description leads to the prediction of all the seven possible S-wave heavy antimeson-baryon molecules (that is, there should be four additional molecular pentaquarks in addition to the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$), providing the first example of a heavy-quark spin symmetry molecular multiplet that is complete. If this is confirmed, it will not only give us an impressive example of the application of heavy-quark symmetries and effective field theories in hadron physics: it will also uncover a clear and powerful ordering principle for the molecular spectrum, reminiscent of the SU(3)-flavor multiplets to which the light hadron spectrum conforms.

    hep-phhep-exhep-latnucl-thPRL(2019)·294 citations
16. 16*

    Dark matter: experimental and observational status

    Vasiliki A. Mitsou🇪🇸

    This brief review covers recent results on searches for dark matter in collider experiments, as well as from direct and indirect detection observatories. It focuses on generic searches for dark matter signatures at the LHC, e.g. mono-X, dijets, etc. Recently observed astrophysical signals that may provide hints of dark matter are also discussed.

    hep-phhep-ex7 citations
17. 17*

    Topological charge fluctuations in the Glasma

    Pablo Guerrero-Rodríguez🇪🇸

    The early-time evolution of the system generated in ultra-relativistic heavy ion collisions is dominated by the presence of strong color fields known as Glasma fields. These can be described following the classical approach embodied in the Color Glass Condensate effective theory, which approximates QCD in the high gluon density regime. In this framework we perform an analytical first-principles calculation of the two-point correlator of the divergence of the Chern-Simons current at proper time $\tau =0^{+}$, which characterizes the early fluctuations of axial charge density in the plane transverse to the collision axis. This object plays a crucial role in the description of anomalous transport phenomena such as the Chiral Magnetic Effect. We compare our results to those obtained under the Glasma Graph approximation, which assumes gluon field correlators to obey Gaussian statistics. While this approach proves to be equivalent to the exact calculation in the limit of short transverse separations, important differences arise at larger distances, where our expression displays a remarkably slower fall-off than the Glasma Graph result ($1/r^4$ vs.\ $1/r^8$ power-law decay). This discrepancy emerges from the non-linear dynamics mapping the Gaussianly-distributed color source densities onto the Glasma fields, encoded in the classical Yang-Mills equations. Our results support the conclusions reached in a previous work, where we found indications that the color screening of correlations in the transverse plane occurs at relatively large distances.

    hep-phnucl-thJHEP(2019)·7 citations
18. 18*

    Nonperturbative analysis of the gravitational waves from a first-order electroweak phase transition

    Oliver Gould🇫🇮 · Jonathan Kozaczuk🇺🇸 · Lauri Niemi🇫🇮 · Michael J. Ramsey-Musolf🇺🇸 · Tuomas V. I. Tenkanen🇫🇮 · David J. Weir🇫🇮

    We present the first end-to-end nonperturbative analysis of the gravitational wave power spectrum from a thermal first-order electroweak phase transition (EWPT), using the framework of dimensionally reduced effective field theory and pre-existing nonperturbative simulation results. We are able to show that a first-order EWPT in any beyond the Standard Model (BSM) scenario that can be described by a Standard Model-like effective theory at long distances will produce gravitational wave signatures too weak to be observed at existing and planned detectors. This implies that colliders are likely to provide the best chance of exploring the phase structure of such theories, while transitions strong enough to be detected at gravitational wave experiments require either previously neglected higher-dimension operators or light BSM fields to be included in the dimensionally reduced effective theory and therefore necessitate dedicated nonperturbative studies. As a concrete application, we analyze the real singlet-extended Standard Model and identify regions of parameter space with single-step first-order transitions, comparing our findings to those obtained using a fully perturbative method. We discuss the prospects for exploring the electroweak phase diagram in this model at collider and gravitational wave experiments in light of our nonperturbative results.

    hep-phastro-ph.COhep-lathep-thPRD(2019)·126 citations
19. 19*

    Patterns of CP violation from mirror symmetry breaking in the $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ Dalitz plot

    Susan Gardner🇺🇸 · Jun Shi🇺🇸

    A violation of mirror symmetry in the $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ Dalitz plot has long been recognized as a signal of C and CP violation. Here we show how the isospin of the underlying C- and CP-violating structures can be reconstructed from their kinematic representation in the Dalitz plot. Our analysis of the most recent experimental data reveals, for the first time, that the C- and CP-violating amplitude with total isospin $I=2$ is much more severely suppressed than that with total isospin $I=0$.

    hep-phnucl-thPRD(2020)·29 citations
20. 20*

    The QCD Renormalization Group Equation and the Elimination of Fixed-Order Scheme-and-Scale Ambiguities Using the Principle of Maximum Conformality

    Xing-Gang Wu🇨🇳 · Jian-Ming Shen🇨🇳 · Bo-Lun Du🇨🇳 · Xu-Dong Huang🇨🇳 · Sheng-Quan Wang🇺🇸 · Stanley J. Brodsky🇺🇸

    The conventional approach to fixed-order perturbative QCD predictions is based on an arbitrary choice of the renormalization scale, together with an arbitrary range. This {\it ad hoc} assignment of the renormalization scale causes the coefficients of the QCD running coupling at each perturbative order to be strongly dependent on the choice of both the renormalization scale and the renormalization scheme. However, such ambiguities are not necessary, since as a basic requirement of renormalization group invariance (RGI), any physical observable must be independent of the choice of both the renormalization scheme and the renormalization scale. In fact, if one uses the {\it Principle of Maximum Conformality} (PMC) to fix the renormalization scale, the coefficients of the pQCD series match the series of conformal theory, and they are thus scheme independent. It has been found that the elimination of the scale and scheme ambiguities at all orders relies heavily on how precisely we know the analytic form of the QCD running coupling ${\alpha }_s$. In this review, we summarize the known properties of the QCD running coupling and its recent progresses, especially for its behavior within the asymptotic region. We also summarize the current progress on the PMC and some of its typical applications, showing to what degree the conventional renormalization scheme-and-scale ambiguities can be eliminated after applying the PMC. We also compare the PA approach for the conventional scale-dependent pQCD series and the PMC scale-independent conformal series. We observe that by using the conformal series, the PA approach can provide a more reliable estimate of the magnitude of the uncalculated terms. And if the conformal series for an observable has been calculated up to $n_{\mathrm{th}}$-order level, then the $[N/M]=[0/n-1]$-type PA series provides an important estimate for the higher-order terms.

    hep-phPPNP(2019)·80 citations
21. 21*

    Non-cancellation of the parity anomaly in the strong-field regime of QED${}_{2+1}$

    Robert Ott🇩🇪 · Torsten V. Zache🇩🇪 · Niklas Mueller🇺🇸 · Jürgen Berges🇩🇪

    Quantum fluctuations lead to an anomalous violation of parity symmetry in quantum electrodynamics for an even number of spatial dimensions. While the leading parity-odd electric current vanishes in vacuum, we uncover a non-cancellation of the anomaly for strong electric fields with distinct macroscopic signatures. We perform real-time lattice simulations with fully dynamical gauge fields and Wilson fermions in $2+1$ space-time dimensions. In the static field limit, relevant at early times, we solve the problem analytically. Our results point out the fundamental role of quantum anomalies for strong-field phenomena, relevant for a wide range of condensed matter and high-energy applications, but also for the next generation of gauge theory quantum simulators.

    ↳ cond-mat.quant-gashep-lathep-phPLB(2020)·7 citations
22. 22*

    An Hamilton-Jacobi formulation of anisotropic inflation

    Francesco Cicciarella🇬🇧 · Joel Mabillard🇬🇧 · Mauro Pieroni🇪🇸 · Angelo Ricciardone🇮🇹

    Classifying inflationary scenarios according to their scaling properties is a powerful way to connect theory with observations. A useful tool to make such a classification is the beta-function formalism. By describing inflation in terms of renormalization group equations, within this framework, it is possible to define universality classes, which can be considered as sets of theories that share a common scale invariant limit. In this paper we apply the formalism to define such classes of universality for models of inflation where the inflaton is coupled to gauge fields. We show that the formalism may consistently be extended to capture the peculiar features of these models such as statistical anisotropy. We also obtain some consistency conditions which serve as useful guidelines for model building.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2019)·12 citations
23. 23*

    Soft Bremsstrahlung

    Steven Weinberg🇺🇸

    Simple analytic formulas are considered for the energy radiated in low frequency bremsstrahlung from fully ionized gases. A formula that has been frequently cited over many years turns out to have only a limited range of validity, more narrow than for a formula derived using the Born approximation. In an attempt to find a more widely valid simple formula, a soft photon theorem is employed, which in this context implies that the differential rate of photon emission in an electron-ion collision with definite initial and final electron momenta is correctly given for sufficiently soft photons by the Born approximation, to all orders in the Coulomb potential. Corrections to the Born approximation arise because the upper limit on photon energy for this theorem to apply to a given collision becomes increasingly stringent as the scattering approaches the forward direction. A general formula is suggested that takes this into account.

    ↳ astro-ph.GAastro-ph.HEhep-phphysics.plasm-phPRD(2019)·10 citations
24. 24*

    Is dark matter fact or fantasy? -- clues from the data

    Philip D. Mannheim🇺🇸

    We discuss arguments both in favor of and against dark matter. With the repeated failure of experiment to date to detect dark matter we discuss what could be done instead, and to this end look for clues in the data themselves. We identify various regularities in galactic rotation curve data that correlate the total gravitational potential with luminous matter rather than dark matter. We identify a contribution to galactic rotation curves coming from the rest of the visible Universe, and suggest that dark matter is just an attempt to describe this global effect in terms of standard local Newtonian gravity within galaxies. Thus the missing mass is not missing at all -- it has been hiding in plain sight all along as the rest of the visible mass in the Universe.

    ↳ astro-ph.GAgr-qchep-phInt.J.Mod.Phys.D(2019)·11 citations
25. 25*

    On QCD RFT corrections to the propagator of reggeized gluons

    S.Bondarenko🇮🇱 · S.Pozdnyakov🇮🇱

    We calculate an one loop QCD Regge Field Theory (RFT) correction to the propagator of reggeized gluons basing on the QCD effective action of Lipatov, \cite{LipatovEff,LipatovEff1,Our1,Our2,Our3,Our4}, and results of \cite{Our5} where Dyson-Schwinger hierarchy of the equations for the correlators of reggeized gluon fields was derived. The correction is calculated entirely in the framework of RFT with the use of the obtained expressions for the RFT bare triple Reggeon vertices and propagator of reggeized gluons, the cases of bare propagator and propagator calculated to one-loop precision are considered separately. In both results the obtained correction represents non-eikonal contributions to the propagator kinematically suppressed by $1/\sqrt{s}$ factor in comparison to the usual LLA contributions. The further application of the obtained results is discussed as well.

    ↳ hep-thhep-phNPB(2020)·11 citations
26. 26*

    Neutrinos and gamma rays from long-lived mediator decays in the Sun

    Carl Niblaeus🇸🇪 · Ankit Beniwal🇧🇪 · Joakim Edsjo🇸🇪

    We investigate a scenario where dark matter (DM) particles can be captured and accumulate in the Sun, and subsequently annihilate into a pair of long-lived mediators. These mediators can decay further out in the Sun or outside of the Sun. Compared to the standard scenario where DM particles annihilate directly into Standard Model particles close to the solar core, here we also obtain fluxes of gamma rays and charged cosmic rays. We simulate this scenario using a full three-dimensional model of the Sun, and include interactions and neutrino oscillations. In particular, we perform a model-independent study of the complementarity between neutrino and gamma ray fluxes by comparing the recent searches from IceCube, Super-Kamiokande, Fermi-LAT, ARGO and HAWC. We find that the resulting neutrino fluxes are significantly higher at high energy when the mediators decay further out in the Sun. We also find that gamma ray searches place stronger constraints than neutrino searches on these models even in cases where the mediators decay mainly inside the Sun, except in the approximately inner 10% of the Sun where neutrino searches are more powerful. We present our results in a model-independent manner and release a new version of the WimpSim code that can be used to simulate this scenario for arbitrary mediator models.

    ↳ astro-ph.HEhep-phJCAP(2019)·68 citations
27. 27*

    A Frenet-Serret Interpretation of Particle Dynamics in High-Intensity Laser Fields

    D. Seipt🇺🇸 · A. G. R. Thomas🇺🇸

    In this paper we discuss the dynamics of charged particles in high-intensity laser fields in the context of the Frenet-Serret formalism, which describes the intrinsic geometry of particle worldlines. We find approximate relations for the Frenet-Serret scalars and basis vectors relevant for high-intensity laser particle interactions. The onset of quantum effects relates to the curvature radius of classical trajectories being on the order of the Compton wavelength. The effects of classical radiation reaction are discussed, as well as the classical precession of the spin-polarization vector according to the Thomas-Bargman-Michel-Telegdi (T-BMT) equation. We comment on the derivation of the photon emission rate in strong-field QED beyond the locally constant field approximation, which is used in Monte Carlo simulations of quantum radiation reaction. Such a numerical simulation is presented for a possible experiment to distinguish between classical and quantum mechanical models of radiation reaction.

    ↳ physics.plasm-phhep-phphysics.atom-phPlasma Phys.Control.Fusion(2019)·8 citations
28. 28*

    Benchmark values for the net proton number fluctuations

    Boris Tomasik🇸🇰 · Ivan Melo🇸🇰 · Lukas Laffers🇸🇰 · Marcus Bleicher🇩🇪

    We formulate a baseline model for the net-proton number fluctuations in ultrarelativistic heavy-ion collisions. Our model includes total baryon number conservation, fluctuations of the participating nucleon number, limited acceptance, and a possibility that isospin is remembered by the participating wounded nucleons. Most importantly, we formulated the model as consisting of two components: wounded nucleons and the produced nucleon-antinucleon pairs. Those two components have different rapidity distributions. Owing to this feature we obtain also predictions for the rapidity dependence of the cumulants of the net-proton number distribution and their ratios.

    ↳ nucl-thhep-phnucl-exPoS(2019)·1 citation
29. 29*

    Vainshtein regime in Scalar-Tensor gravity: constraints on DHOST theories

    Marco Crisostomi🇫🇷 · Matthew Lewandowski🇫🇷 · Filippo Vernizzi🇫🇷

    We study the screening mechanism in the most general scalar-tensor theories that leave gravitational waves unaffected and are thus compatible with recent LIGO/Virgo observations. Using the effective field theory of dark energy approach, we consider the general action for perturbations beyond linear order, focussing on the quasi-static limit. When restricting to the subclass of theories that satisfy the gravitational wave constraints, the fully nonlinear effective Lagrangian contains only three independent parameters. One of these, ${\beta }_1$, is uniquely present in degenerate higher-order theories. We compute the two gravitational potentials for a spherically symmetric matter source and we find that for ${\beta }_1\ge 0$ they decrease as the inverse of the distance, as in standard gravity, while the case ${\beta }_1<0$ is ruled out. For ${\beta }_1>0$, the two potentials differ and their gravitational constants are not the same on the inside and outside of the body. Generically, the bound on anomalous light bending in the Solar System constrains ${\beta }_1\lesssim 10^{-5}$. Standard gravity can be recovered outside the body by tuning the parameters of the model, in which case ${\beta }_1\lesssim 10^{-2}$ from the Hulse-Taylor pulsar.

    ↳ gr-qcastro-ph.COhep-phhep-thPRD(2019)·89 citations
30. 30*

    New Shapes of Primordial Non-Gaussianity from Quasi-Single Field Inflation with Multiple Isocurvatons

    Michael McAneny🇺🇸 · Alexander K. Ridgway🇺🇸

    We study a simple extension of quasi-single field inflation in which the inflaton interacts with multiple extra massive scalars known as isocurvatons. Due to the breaking of time translational invariance by the inflaton background, the theory includes kinetic mixings among the inflaton and isocurvatons. These mixings give rise to novel new features in the primordial non-Gaussianities of the scalar curvature perturbation. A noteworthy feature is the amplitude of the squeezed bispectrum can grow nearly as $(k_s/k_l{)}^{-3}$ while oscillating as $\cos \gamma \log (k_s/k_l)$, where $k_s/k_l$ is the ratio of the lengths of the short and long wavevectors. Observation of such a shape would provide evidence for the existence of multiple isocurvatons during inflation. In addition, we consider the effects of these non-Gaussianities on large-scale structure.

    ↳ astro-ph.COhep-phhep-thPRD(2019)·31 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.