Fri·Jul 14, 2017Friday·July 14, 2017

1. 01*

   Supergravity Model of Inflation and Explaining IceCube HESE Data via PeV Dark Matter Decay

   Girish Kumar Chakravarty🇮🇳 · Najimuddin Khan🇮🇳 · Subhendra Mohanty🇮🇳

   We construct an unified model of inflation and PeV dark matter with an appropriate choice of no-scale Kähler potential, superpotential and gauge kinetic function in terms of MSSM fields and hidden sector Polonyi field. The model is consistent with the CMB observations and can explain the PeV neutrino flux observed at IceCube HESE. A Starobinsky like Higgs-sneutrino plateau inflation is obtained from the $D$-term SUGRA potential while $F$-term being subdominant during inflation. To get PeV dark matter, SUSY breaking at PeV scale is achieved through Polonyi field. This sets the scale for soft SUSY breaking parameters $m_0,m_{1/2},A_0$ at the GUT scale in terms of the parameters of the model. The low energy particles spectrum is obtained by running the RGEs. We show that the $\sim$125 GeV higgs and the gauge coupling unification can be obtained in this model. The $6$ PeV bino-type dark matter is a subdominant fraction ($\sim 11\%$) of the relic density and its decay gives the PeV scale neutrino flux observed at IceCube by appropriately choosing the couplings of the $R$-parity violating operators. Also we find that there is a degeneracy in scalar field parameters $(\gamma ,\beta )$ and coupling $\zeta$ value in producing the correct amplitude of CMB power spectrum. However the value of parameter $\tan (\beta )=1.8$, which is tightly fixed from the requirement of PeV scale SUSY breaking, removes the degeneracy in the values of the scalar field parameters to provide a unique solution for inflation. In this way it brings the explanation for dark matter, PeV neutrinos and inflation within the same framework.

   hep-phastro-ph.COgr-qcAdv.High Energy Phys.(2020)·12 citations
2. 02*

   Constraints on Higgs effective couplings in $H\nu \bar{\nu }$ production of CLIC at 380 GeV

   H. Denizli🇹🇷 · A. Senol🇹🇷

   The potential of the $e^{+}{e}^{-}\to \nu \bar{\nu }H$ process in the first stage of CLIC considering center of mass energy of 380 GeV and assuming the baseline integrated luminosity of 500 fb${}^{-1}$ is examined to probe CP conserving dimension-six operators in a model-independent Standard Model effective field theory framework. In the analysis, a detailed fast simulation on $e^{+}{e}^{-}\to \nu \bar{\nu }H$ signal processes and dominant backgrounds are performed including parton showering with PYTHIA and detector simulation based on ILD type detector with DELPHES in MadGraph. The obtained best limits on the ${\bar{c}}_{HB}$, ${\bar{c}}_W=-{\bar{c}}_B$ and ${\bar{c}}_{HW}$ are $[-4.82;1.53]\times 10^{-2}$, $[-5.11;4.13]\times 10^{-3}$ and $[-6.58;5.55]\times 10^{-3}$, respectively.

   hep-phAdv.High Energy Phys.(2018)·22 citations
3. 03*

   Quark number scaling of hadronic $p_T$ spectra and constituent quark degree of freedom in $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV

   Jun Song🇨🇳 · Xing-rui Gou🇨🇳 · Feng-lan Shao🇨🇳 · Zuo-Tang Liang🇨🇳

   We show that the experimental data of $p_T$ spectra of identified hadrons released recently by ALICE collaboration for $p$-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV exhibit a distinct universal behavior --- the quark number scaling. We further show that the scaling is a direct consequence of quark (re-)combination mechanism of hadronization and can be regarded as a strong indication of the existence of the underlying source with constituent quark degree of freedom for the production of hadrons in $p$-Pb collisions at such high energies. We make also predictions for production of other hadrons.

   hep-phPLB(2017)·22 citations
4. 04*

   Hadronic tau decays and the strong coupling

   Diogo Boito🇧🇷 · Maarten Golterman🇺🇸 · Kim Maltman🇨🇦 · Santiago Peris🇪🇸

   We provide an overview of recent determinations of the strong coupling, ${\alpha }_s$, from hadronic $\tau$ decays. We contrast two analysis methods, the "truncated-OPE approach" and the "DV-model approach," highlighting the assumptions going into each of these. We argue that a detailed study based on ALEPH data shows the truncated-OPE approach to be quantitatively unreliable, while the DV-model approach passes all tests. New data for hadronic $\tau$ decays from Belle and Belle-II could provide more stringent tests of the DV-model approach, and thus potentially lead to a more precise value of ${\alpha }_s$ from hadronic $\tau$ decays.

   hep-phhep-exJ.Phys.Conf.Ser.(2017)·0 citations
5. 05*

   $\rho$ meson unpolarized generalized parton distributions with a light-front constituent quark model

   Bao-Dong Sun🇨🇳 · Yu-Bing Dong🇨🇳

   We study $\rho$ meson unpolarized generalized parton distributions based on a light-front constituent quark model where the quark-antiquark-meson vertex is constructed under the symmetric loop momentum convention. The form factors and some other low-energy observables of the $\rho$ meson are calculated. Moreover, the contributions to the form factors and generalized parton distributions from the valence and nonvalence regimes are discussed and analyzed in detail. In the forward limit, the usual structure functions are estimated as well. In addition, by evolving the moments of the obtained structure functions to the scale of the lattice calculation, we give the factorization scale of our quark model. It is found that the present phenomenological model is reasonable to describe the general properties of $\rho$ meson.

   hep-phPRD(2017)·43 citations
6. 06*

   The Constrained NMSSM with right-handed neutrinos

   David G. Cerdeno🇬🇧 · Valentina De Romeri🇪🇸 · Victor Martin-Lozano🇩🇪 · Keith A. Olive🇺🇸 · Osamu Seto🇯🇵

   In this article, we study the renormalization group equations of the Next-to-Minimal Supersymmetric Standard Model, and investigate universality conditions on the soft supersymmetry-breaking parameters at the Grand Unification scale. We demonstrate that the inclusion of right-handed neutrino superfields can have a substantial effect on the running of the soft terms (greatly contributing to driving the singlet Higgs mass- squared parameter negative), which makes it considerably easier to satisfy the conditions for radiative electroweak symmetry-breaking. The new fields also lead to larger values of the Standard Model Higgs mass, thus making it easier to reproduce the measured value. We investigate the phenomenology of this constrained scenario, and focus on two viable benchmark points, which feature a neutral lightest supersymmetric particle (either the lightest neutralino or the right-handed sneutrino). We show that all bounds from colliders and low-energy observables can be fulfilled in wide areas of the parameter space. However, the relic density in these regions is generally too high requiring some form of late entropy production to dilute the density of the lightest supersymmetric particle.

   hep-phEPJC(2018)·9 citations
7. 07*

   General unquenching properties of two-meson scattering and production amplitudes

   Eef van Beveren🇵🇹 · George Rupp🇵🇹

   Besides the unitarity and symmetry requirements for a multi-resonance scattering amplitude, several other natural conditions can easily exclude unrealistic proposals. In particular, the behaviour of singularities under the variation of model parameters yields important information. We discuss how resonance poles should move in the complex-energy plane when coupling constants and masses are varied, how resonances above threshold can turn into bound states below threshold and how the light-quark spectrum can be turned into the spectrum of heavy quarks, with one and the same analytic expression for the scattering amplitude. Moreover, it is shown that perturbative approximations usually do not satisfy those natural conditions.

   hep-phhep-exActa Phys.Polon.Supp.(2017)·0 citations
8. 08*

   Phenomenological Aspects of Possible Vacua of a Neutrino Flavor Model

   Takuya Morozumi🇯🇵 · Hideaki Okane🇯🇵 · Hiroki Sakamoto🇯🇵 · Yusuke Shimizu🇯🇵 · Kenta Takagi🇯🇵 · Hiroyuki Umeeda🇯🇵

   We discuss a supersymmetric model with discrete flavor symmetry $A_4\times Z_3$. The additional scalar fields which contribute masses of leptons in the Yukawa terms are introduced in this model. We analyze their scalar potential and find that they have various vacuum structures. We show the relations among 24 different vacua and classify them into two types. We derive expressions of the lepton mixing angles, Dirac CP violating phase and Majorana phases for the two types. The model parameters which are allowed by the experimental data of the lepton mixing angles are different for each type. We also study the constraints on the model parameters which are related to Majorana phases. The different allowed regions of the model parameters for the two types are shown numerically for a given region of two combinations of the CP violating phases.

   hep-phCPC(2018)·9 citations
9. 09*

   Doubly charmed baryon mass and wave function through a random walks method

   B.O. Kerbikov🇷🇺

   The mass and the wave function of doubly charmed ${\Xi }_{cc}^{++}$ (ccu) baryon are evaluated using Green Function Monte Carlo method to solve the three-body problem with Cornell potential. The mass of ${\Xi }_{cc}^{++}$ with spin $1/2$ is in a good agreement with the LHCb value. Simulation of the wave function by random walks resulted in a configuration of the quark-diquark type. The radius of ${\Xi }_{cc}^{++}$ is much larger than the size needed for a large isospin splitting. The prediction for the ${\Omega }_{cc}$ mass is presented.

   hep-phhep-exJETP Lett.(2018)·7 citations
10. 10*

    $B\bar{B}$ angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements

    Anton Karpishkov🇷🇺 · Maxim Nefedov🇷🇺 · Vladimir Saleev🇷🇺

    We calculate the angular distribution spectra between beauty ($B$) and anti-beauty ($\bar{B}$) mesons in proton-proton collisions in the leading order approximation of the parton Reggeization approach consistently merged with the next-to-leading order corrections from the emission of additional hard gluon. To describe b-quark hadronization we use the universal scale-depended parton-to-meson fragmentation functions extracted from the world $e^{+}{e}^{-}$ annihilation data. We have obtained good agreement between our predictions and data from the CMS Collaboration at the energy $\sqrt{S}=7$ TeV for $B\bar{B}$ angular correlations within uncertainties and without free parameters. Predictions for analogous correlation observables at $\sqrt{S}=13$ TeV are provided.

    hep-phPRD(2017)·52 citations
11. 11*

    Coincidence charged-current neutrino-induced deuteron disintegration for ${}^2{\mathrm{H}}_2{}^{16}\mathrm{O}$

    J. W. Van Orden🇺🇸 · T. W. Donnelly🇺🇸 · O. Moreno🇪🇸

    Semi-inclusive charge-changing neutrino reactions on targets of heavy water are investigated with the goal of determining the relative contributions to the total cross section of deuterium and oxygen in kinematics chosen to emphasize the former. The study is undertaken for conditions where the typical neutrino beam energies are in the few GeV region, and hence relativistic modeling is essential. For this, the previous relativistic approach for the deuteron is employed, together with a spectral function approach for the case of oxygen. Upon optimizing the kinematics of the final-state particles assumed to be detected (typically a muon and a proton) it is shown that the oxygen contribution to the total cross section is suppressed by roughly an order of magnitude compared with the deuterium cross section, thereby confirming that CC$\nu$ studies of heavy water can effectively yield the cross sections for deuterium, with acceptable backgrounds from oxygen. This opens the possibility of using deuterium to determine the incident neutrino flux distribution, to have it serve as a target for which the nuclear structure issues are minimal, and possibly to use deuterium to provide improved knowledge of specific aspects of hadronic structure, such as to explore the momentum transfer dependence of the isovector axial-vector form factor of the nucleon.

    hep-phPRD(2017)·5 citations
12. 12*

    The contribution of axial-vector mesons to hyperfine structure of muonic hydrogen

    A.E. Dorokhov🇷🇺 · N.I. Kochelev🇷🇺 · A.P. Martynenko🇷🇺 · F.A. Martynenko🇷🇺 · A.E. Radzhabov🇨🇳

    The contribution from the axial-vector meson exchange to the potential of the muon-proton interaction in muonic hydrogen induced by anomalous axial-vector meson coupling to two photon state is calculated. It is shown that such contribution to the hyperfine splitting in muonic hydrogen is large and important for a comparison with precise experimental data. In the light of our result, the proton radius "puzzle" is discussed.

    hep-phphysics.atom-phPLB(2018)·35 citations
13. 13*

    Sensitivity of jet substructure to jet-induced medium response

    José Guilherme Milhano🇵🇹 · Urs Achim Wiedemann🇨🇭 · Korinna Christine Zapp🇨🇭

    Jet quenching in heavy ion collisions is expected to be accompanied by recoil effects, but unambiguous signals for the induced medium response have been difficult to identify so far. Here, we argue that modern jet substructure measurements can improve this situation qualitatively since they are sensitive to the momentum distribution inside the jet. We show that the groomed subjet shared momentum fraction $z_g$, and the girth of leading and subleading subjets signal recoil effects with dependencies that are absent in a recoilless baseline. We find that recoil effects can explain most of the medium modifications to the $z_g$ distribution observed in data. Furthermore, for jets passing the Soft Drop Condition, recoil effects induce in the differential distribution of subjet separation $\Delta R_{12}$ a characteristic increase with $\Delta R_{12}$, and they introduce a characteristic enhancement of the girth of the subleading subjet with decreasing $z_g$. We explain why these qualitatively novel features, that we establish in \textsc{Jewel+Pythia} simulations, reflect generic physical properties of recoil effects that should therefore be searched for as telltale signatures of jet-induced medium response.

    hep-phnucl-exnucl-thPLB(2018)·112 citations
14. 14*

    Production of magnetic monopoles and monopolium in peripheral collisions

    J. T. Reis🇧🇷 · W. K. Sauter🇧🇷

    The exclusive production by the photon fusion of magnetic monopoles and the bound states of magnetic monopoles, the monopolium, is consider in different high energy processes. More specifically, we calculate the total cross sections of the ultraperipheral elastic collisions of electron-electron, proton-proton and lead-lead in present and future colliders, comparing with the previous results found in the literature. Our results indicates that magnetic monopoles or his bound states, if both exists, can be measuareble in future electron-electron colliders.

    hep-phhep-exPRD(2017)·18 citations
15. 15*

    Radiative corrections to Higgs couplings with weak gauge bosons in custodial multi-Higgs models

    Cheng-Wei Chiang🇹🇼 · An-Li Kuo🇹🇼 · Kei Yagyu🇮🇹

    We calculate 1-loop radiative corrections to the $hZZ$ and $hWW$ couplings in models with next--to--simplest Higgs sectors satisfying the electroweak $\rho$ parameter equal to 1 at tree level: the Higgs singlet model, the two-Higgs doublet models, and the Georgi-Machacek model. Under theoretical and current experimental constraints, the three models have different correlations between the deviations in the $hZZ$ and $hWW$ couplings from the standard model predictions. In particular, we find for each model predictions with no overlap with the other two models.

    hep-phPLB(2017)·24 citations
16. 16*

    A Composite Axion from a Supersymmetric Product Group

    Benjamin Lillard🇺🇸 · Tim M. P. Tait🇺🇸

    A global $U(1{)}_{\text{PQ}}$ symmetry is protected from gravitational effects in the s-confining $SU(N{)}^k$ product group theory with $A+4Q+N\overline{Q}$ matter. If the $SU(4)$ family symmetry is gauged and an appropriate tree-level superpotential is added, then the dynamically generated superpotential spontaneously breaks $SU(4)\times U(1{)}_{\text{PQ}}\to SU(3{)}_c$ and produces a QCD axion. Small values of the $CP$-violating $\theta$ parameter are then possible without any fine-tuning, as long as the product group is suitably large. By introducing a second copy of the s-confining $SU(N)$ product group also coupled to the gauged $SU(4)$, we find that values as small as $N=7$ are consistent with $\bar{\theta }<10^{-10}$, even under the pessimistic assumption that the dominant contribution to the axion quality is at tree level.

    hep-phJHEP(2017)·48 citations
17. 17*

    Dielectric haloscopes: sensitivity to the axion dark matter velocity

    Alexander J. Millar🇩🇪 · Javier Redondo🇪🇸 · Frank D. Steffen🇩🇪

    We study the effect of the axion dark matter velocity in the recently proposed dielectric haloscopes, a promising avenue to search for well-motivated high mass ($40-400\mu$eV) axions. We describe non-zero velocity effects for axion-photon mixing in a magnetic field and for the phenomenon of photon emission from interfaces between different dielectric media. As velocity effects are only important when the haloscope is larger than about 20% of the axion de Broglie wavelength, for the planned MADMAX experiment with 80 dielectric disks the velocity dependence can safely be neglected. However, an augmented MADMAX or a second generation experiment would be directionally sensitive to the axion velocity, and thus a sensitive measure of axion astrophysics.

    hep-phastro-ph.COhep-exJCAP(2017)·46 citations
18. 18*

    Big Bang Nucleosynthesis with Stable ${}^8$Be and the Primordial Lithium Problem

    Richard T. Scherrer🇺🇸 · Robert J. Scherrer🇺🇸

    A change in the fundamental constants of nature or plasma effects in the early universe could stabilize ${}^8$Be against decay into two ${}^4$He nuclei. Coc et al. examined this effect on big bang nucleosynthesis as a function of $B_8$, the mass difference between two ${}^4$He nuclei and a single ${}^8$Be nucleus, and found no effects for $B_8\le 100$ keV. Here we examine stable ${}^8$Be with larger $B_8$ and also allow for a variation in the rate for ${}^4$He + ${}^4$He $⟶$ ${}^8$Be to determine the threshold for interesting effects. We find no change to standard big bang nucleosynthesis for $B_8<1$ MeV. For $B_8\gtrsim 1$ MeV and a sufficiently large reaction rate, a significant fraction of ${}^4$He is burned into ${}^8$Be, which fissions back into ${}^4$He when $B_8$ assumes its present-day value, leaving the primordial ${}^4$He abundance unchanged. However, this sequestration of ${}^4$He results in a decrease in the primordial ${}^7$Li abundance. Primordial abundances of ${}^7$Li consistent with observationally-inferred values can be obtained for reaction rates similar to those calculated for the present-day (unbound ${}^8$Be) case. Even for the largest binding energies and largest reaction rates examined here, only a small fraction of ${}^8$Be is burned into heavier elements, consistent with earlier studies. There is no change in the predicted deuterium abundance for any model we examined.

    ↳ astro-ph.COhep-phnucl-thPRD(2017)·2 citations
19. 19*

    Bosonic Tensor Models at Large $N$ and Small $ϵ$

    Simone Giombi🇺🇸 · Igor R. Klebanov🇺🇸 · Grigory Tarnopolsky🇺🇸

    We study the spectrum of the large $N$ quantum field theory of bosonic rank-$3$ tensors, whose quartic interactions are such that the perturbative expansion is dominated by the melonic diagrams. We use the Schwinger-Dyson equations to determine the scaling dimensions of the bilinear operators of arbitrary spin. Using the fact that the theory is renormalizable in $d=4$, we compare some of these results with the $4-ϵ$ expansion, finding perfect agreement. This helps elucidate why the dimension of operator ${\varphi }^{abc}{\varphi }^{abc}$ is complex for $d<4$: the large $N$ fixed point in $d=4-ϵ$ has complex values of the couplings for some of the $O(N{)}^3$ invariant operators. We show that a similar phenomenon holds in the $O(N{)}^2$ symmetric theory of a matrix field ${\varphi }^{ab}$, where the double-trace operator has a complex coupling in $4-ϵ$ dimensions. We also study the spectra of bosonic theories of rank $q-1$ tensors with ${\varphi }^q$ interactions. In dimensions $d>1.93$ there is a critical value of $q$, above which we have not found any complex scaling dimensions. The critical value is a decreasing function of $d$, and it becomes $6$ in $d\approx 2.97$. This raises a possibility that the large $N$ theory of rank-$5$ tensors with sextic potential has an IR fixed point which is free of perturbative instabilities for $2.97<d<3$. This theory may be studied using renormalized perturbation theory in $d=3-ϵ$.

    ↳ hep-thhep-phPRD(2017)·126 citations
20. 20*

    More asymptotic safety guaranteed

    Andrew D. Bond🇬🇧 · Daniel F. Litim🇬🇧

    We study interacting fixed points and phase diagrams of simple and semi-simple quantum field theories in four dimensions involving non-abelian gauge fields, fermions and scalars in the Veneziano limit. Particular emphasis is put on new phenomena which arise due to the semisimple nature of the theory. Using matter field multiplicities as free parameters, we find a large variety of interacting conformal fixed points with stable vacua and crossovers inbetween. Highlights include semi-simple gauge theories with exact asymptotic safety, theories with one or several interacting fixed points in the IR, theories where one of the gauge sectors is both UV free and IR free, and theories with weakly interacting fixed points in the UV and the IR limits. The phase diagrams for various simple and semi-simple settings are also given. Further aspects such as perturbativity beyond the Veneziano limit, conformal windows, and implications for model building are discussed.

    ↳ hep-thhep-phPRD(2018)·57 citations
21. 21*

    Small-Scale Challenges to the $\Lambda$CDM Paradigm

    James S. Bullock (UC Irvine)🇺🇸 · Michael Boylan-Kolchin (UT Austin)🇺🇸

    The dark energy plus cold dark matter ($\Lambda$CDM) cosmological model has been a demonstrably successful framework for predicting and explaining the large-scale structure of Universe and its evolution with time. Yet on length scales smaller than $\sim 1$ Mpc and mass scales smaller than $\sim 10^{11}{M}_{\odot }$, the theory faces a number of challenges. For example, the observed cores of many dark-matter dominated galaxies are both less dense and less cuspy than naively predicted in $\Lambda$CDM. The number of small galaxies and dwarf satellites in the Local Group is also far below the predicted count of low-mass dark matter halos and subhalos within similar volumes. These issues underlie the most well-documented problems with $\Lambda$CDM: Cusp/Core, Missing Satellites, and Too-Big-to-Fail. The key question is whether a better understanding of baryon physics, dark matter physics, or both will be required to meet these challenges. Other anomalies, including the observed planar and orbital configurations of Local Group satellites and the tight baryonic/dark matter scaling relations obeyed by the galaxy population, have been less thoroughly explored in the context of $\Lambda$CDM theory. Future surveys to discover faint, distant dwarf galaxies and to precisely measure their masses and density structure hold promising avenues for testing possible solutions to the small-scale challenges going forward. Observational programs to constrain or discover and characterize the number of truly dark low-mass halos are among the most important, and achievable, goals in this field over then next decade. These efforts will either further verify the $\Lambda$CDM paradigm or demand a substantial revision in our understanding of the nature of dark matter.

    ↳ astro-ph.COhep-phAnn.Rev.Astron.Astrophys.(2017)·1468 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.