Wed·Jun 12, 2019Wednesday·June 12, 2019

1. 01*

   Dark matter capture in celestial objects: Improved treatment of multiple scattering and updated constraints from white dwarfs

   Basudeb Dasgupta (Tata Inst.)🇮🇳 · Aritra Gupta (Tata Inst.)🇮🇳 · Anupam Ray (Tata Inst.)🇮🇳

   We revisit dark matter (DM) capture in celestial objects, including the impact of multiple scattering, and obtain updated constraints on the DM-proton cross section using observations of white dwarfs. Considering a general form for the energy loss distribution in each scattering, we derive an exact formula for the capture probability through multiple scatterings. We estimate the maximum number of scatterings that $can$ take place, in contrast to the number $required$ to bring a dark matter particle to rest. We employ these results to compute a "dark" luminosity $L_{\mathrm{DM}}$, arising solely from the thermalized annihilation products of the captured dark matter. Demanding that $L_{\mathrm{DM}}$ not exceed the luminosity of the white dwarfs in the M4 globular cluster, we set a bound on the DM-proton cross section: ${\sigma }_p\lesssim 10^{-44}{\mathrm{cm}}^2$, almost independent of the dark matter mass between 100 GeV and 1 PeV and mildly weakening beyond. This is a stronger constraint than those obtained by direct detection experiments in both large mass $\left(M\gtrsim 5\mathrm{TeV}\right)$ and small mass $\left(M\lesssim 10\mathrm{GeV}\right)$ regimes. For dark matter lighter than 350 MeV, which is beyond the sensitivity of present direct detection experiments, this is the strongest available constraint.

   hep-phastro-ph.COJCAP(2019)·106 citations
2. 02*

   Vector and axial-vector meson properties in a nonlocal SU(2) PNJL model

   J.P. Carlomagno🇦🇷 · M.F. Izzo Villafañe🇦🇷

   We study the features of a SU(2) Polyakov-Nambu-Jona-Lasinio model that includes wave function renormalization and nonlocal vector interactions. Within this framework we analyze, among other properties, the masses, width and decay constants of light vector and axial-vector mesons at finite temperature. Then we obtain the corresponding phase diagram in a finite density scenario, after characterizing the deconfinement and chiral restoration transitions.

   hep-phPRD(2019)·9 citations
3. 03*

   Comparative Penning-Trap Tests of Lorentz and CPT Symmetry

   Yunhua Ding🇺🇸

   The theoretical and experimental prospects for Lorentz- and CPT-violating quantum electrodynamics in Penning traps are reviewed in this work. With the recent reported results for the measurements of magnetic moments for both protons and antiprotons, improvements with factors of up to 3000 for the constraints of various coefficients for Lorentz and CPT violation are obtained.

   hep-ph1 citation
4. 04*

   Diffractive dijet production from the Color Glass Condensate and the small-$x$ gluon distributions

   Heikki Mäntysaari🇫🇮 · Niklas Mueller🇺🇸 · Björn Schenke🇺🇸

   We study exclusive dijet production in electron-proton deep inelastic scattering at a future Electron Ion Collider. We predict the elliptic modulation of the cross section as a function of the angle between the dijet transverse momentum and the recoil momentum, and show that this modulation is due to non-trivial angular correlations between the transverse coordinate and transverse momentum in the Wigner (or Husimi) distribution. The small-$x$ evolution is shown to decrease the elliptic modulation in the EIC kinematics, because of the growth of the proton with decreasing $x$.

   hep-phnucl-thPoS(2019)·2 citations
5. 05*

   Studies on the $B\to \kappa \bar{\kappa }$ decays in the perturbative QCD approach

   Liangliang Su🇨🇳 · Zewen Jiang🇨🇳 · Xin Liu🇨🇳

   The $B\to \kappa \bar{\kappa }$ decays are investigated for the first time in the perturbative QCD formalism based on the $k_T$ factorization theorem, where the light scalar $\kappa$ is assumed as a two-quark state. Our numerical results and phenomenological analyses on the CP-averaged branching ratios and CP-violating asymmetries show that: (a) the $B_s^0\to {\kappa }^{+}{\kappa }^{-}$ and $B_s^0\to {\kappa }^0{\bar{\kappa }}^0$ decays have large decay rates around $\mathcal{O}(10^{-5})$, which could be examined by the upgraded Large Hadron Collider beauty and/or Belle-II experiments in the near future; (b) a large decay rate about $3\times 10^{-6}$ appears in the pure annihilation $B_d^0\to {\kappa }^{+}{\kappa }^{-}$ channel, which could provide more evidences to help distinguish different QCD-inspired factorization approaches, even understand the annihilation decay mechanism; (c) the pure penguin modes $B_d^0\to {\kappa }^0{\bar{\kappa }}^0$ and $B_s^0\to {\kappa }^0{\bar{\kappa }}^0$ would provide a promising ground to search for the possible new physics because of their zero direct and mixing-induced CP violations in the standard model. The examinations with good precision from the future experiments will help to further study the perturbative and/or nonperturbative QCD dynamics involved in these considered decay modes.

   hep-phJ.Phys.G(2019)·4 citations
6. 06*

   Combining the small-x evolution and DGLAP for description of inclusive photon induced processes

   B.I. Ermolaev🇷🇺 · S.I. Troyan🇷🇺

   Interest in studying the inclusive photon induced processes of Deep-Inelastic Scattering (DIS) and Diffractive DIS (DDIS) at high energies includes their experimental investigation and thorough theoretical description. The conventional instrument for theoretical investigation of DIS at large x is DGLAP. It describes the Q^2-evolution. Description of DIS in the small-x region requires accounting for the both Q^2 and x -evolution at the same time. Combining DGLAP with total resummation of double logarithms of x and Q^2, we present a description of structure function F_1 at large Q^2 and arbitrary x. Making use of the necessity of the shift of Q^2 in order to regulate infrared singularities, we obtain an expression for F_1 valid at arbitrary x and Q^2. The obtained expressions coincide with the DLA expressions at small x and at the same time coincides with the DGLAP result at large x and large Q^2. Accounting for virtualities k^2 of the external partons allows us to obtain expressions for F_1 in K_T-Factorization, which are valid at arbitrary Q^2 and arbitrary relations between Q^2 and k^2. Expressions for F_1 in all types of QCD factorization exhibit the small-x asymptotics of the Pomeron type. This Pomeron is generated by the high-energy asymptotics of amplitudes of the 2 -> 2 parton-parton forward scattering. These amplitudes are calculated in DLA, so their asymptotics have nothing to do with the BFKL Pomeron. We demonstrate that the parton-parton amplitudes can be used in the DDIS models instead of BFKL Pomeron or combinations of hard and soft Pomerons at non-asymptotic energies. On the other hand, this modification automatically ensures the Pomerons asymptotics, which simplifies and makes more consistent theory of DDIS.

   hep-phEPJC(2020)·2 citations
7. 07*

   Leptogenesis after superconformal subcritical hybrid inflation

   Yoshihiro Gunji🇯🇵 · Koji Ishiwata🇯🇵

   We consider an extended version of superconformal subcritical hybrid inflation model by introducing three right-handed neutrinos that have the Majorana mass terms. In the model one of the right-handed sneutrinos plays a role of the inflaton field, and it decays to reheat the universe after inflation. The vacuum expectation value for the waterfall field gives an unconventional pattern of the light neutrino mass matrix, and the neutrino Yukawa couplings that determine the reheating temperature are not constrained by the neutrino oscillation data. Consequently thermal leptogenesis or sneutrino leptogenesis is realized.

   hep-phastro-ph.COhep-thJHEP(2019)·7 citations
8. 08*

   Probing the top quark flavor-changing couplings at CEPC

   Liaoshan Shi🇨🇳 · Cen Zhang🇨🇳

   We propose to study the flavor properties of the top quark at the future Circular Electron Positron Collider (CEPC) in China. We systematically consider the full set of 56 real parameters that characterize the flavor-changing neutral interactions of the top quark, which can be tested at CEPC in the single top production channel. Compared with the current bounds from the LEP2 data and the projected limits at the high-luminosity LHC, we find that CEPC could improve the limits of the four-fermion flavor-changing coefficients by one to two orders of magnitude, and would also provide similar sensitivity for the two-fermion flavor-changing coefficients. Overall, CEPC could explore a large fraction of currently allowed parameter space that will not be covered by the LHC upgrade. We show that the $c$-jet tagging capacity at CEPC could further improve its sensitivity to top-charm flavor-changing couplings. If a signal is observed, the kinematic distribution as well as the $c$-jet tagging could be exploited to pinpoint the various flavor-changing couplings, providing valuable information about the flavor properties of the top quark.

   hep-phhep-exCPC(2019)·30 citations
9. 09*

   Study on Anomalous Neutral Triple Gauge Boson Couplings from Dimension-eight Operators at the HL-LHC

   A. Senol (BAIBU)🇹🇷 · H. Denizli (BAIBU)🇹🇷 · A. Yilmaz (GU)🇹🇷 · I. Turk Cakir (GU)🇹🇷 · O. Cakir (AU)🇹🇷

   The anomalous neutral triple gauge boson couplings (aNTGCs) for the Z gamma gamma and Z gamma Z vertices described by dimension-eight operators are examined through the process pp to l^{+}l^{-} gamma at the High-Luminosity Large Hadron Collider (HL-LHC). We performed an analysis on transverse momentum of photon and angular distribution of charged lepton in the final state including detector effects. Sensitivity limits of the C_{\widetilde{B}W}, C_{BB} couplings are obtained at 95 % C.L. to constrain for the range [-1.88: 1.88] TeV^{-4}, [-1.47: 1.47] TeV^{-4} and [-1.14:1.14] TeV^{-4}, [-0.86: 0.86] TeV^{-4} with an integrated luminosity of 300 fb^{-1} and 3000 fb^{-1}, respectively.

   hep-ph11 citations
10. 10*

    Optical manifestations of domains with constant topological charge density

    Evan Stewart🇺🇸 · Kirill Tuchin🇺🇸

    Domains of finite topological charge density can exist in chiral materials and chiral matter. Spatial and temporal variation of the average topological charge density, represented by the $\theta$-field, induces anomalous currents that are responsible for the chiral magnetic effect, the anomalous Hall effect and other phenomena that are intimately related to the chiral anomaly. We consider domains with constant average topological charge density. We argue that even though the Maxwell equations in the bulk are not altered, the chiral anomaly manifests itself by the way of the boundary conditions. This is illustrated by several examples. The first example deals with the refraction of plane electromagnetic wave on a surface of a constant-$\theta$ domain. We derive the modified Fresnel equations and discuss the effect of the chiral anomaly on the amplitude and polarization of the reflected and transmitted waves. In particular, we argue that the Brewster's angle is sensitive to the value of $\theta$. In the second example we compute the spectrum of the transition radiation at high frequencies and show that it is enhanced at finite $\theta$.

    hep-phcond-mat.mes-hallPhys.Rev.Research.(2019)·3 citations
11. 11*

    Study of spin-spin correlations between quark and a spin-$\frac{1}{2}$ particle

    Satvir Kaur🇮🇳 · Harleen Dahiya🇮🇳

    We study the correlation between the fermion composite system and quark spins by using the light-cone quark-diquark model. We do the calculations for $u$-quark and $d$-quark in the fermion system by considering the different polarization configrations of both. The contribution from scalar and axial-vector diquarks is taken into account. The overlap represenation of light-front wavefunctions is used for the calculations. The spin-spin correlations for $u$ and $d$ quarks are presented in transverse impact-parameter plane and transverse momentum plane as well.

    hep-phAdv.High Energy Phys.(2020)·9 citations
12. 12*

    A Monte-Carlo Simulation of Double Parton Scattering

    Baptiste Cabouat🇬🇧 · Jonathan R. Gaunt🇨🇭 · Kiran Ostrolenk🇬🇧

    In this work, a new Monte-Carlo simulation of double parton scattering (DPS) at parton level is presented. The simulation is based on the QCD framework developed recently by M. Diehl, J. R. Gaunt and K. Schönwald. With this framework, the dynamics of the $1\to 2$ perturbative splittings is consistently included inside the simulation, with the impact-parameter dependence taken into account. The simulation evolves simultaneously two hard systems from a common hard scale down to the hadronic scale. The evolution is performed using an angular-ordered parton shower which is combined with a set of double parton distributions that depend explicitly on the inter-parton distance. An illustrative study is performed in the context of same-sign WW production at the LHC, with the quark content of the proton being limited to three flavours. In several distributions we see differences compared to DPS models in Herwig, Pythia, and the DPS "pocket formula".

    hep-phJHEP(2019)·27 citations
13. 13*

    R-Parity Violating Supersymmetry and the 125 GeV Higgs signals

    Jonathan Cohen🇮🇱 · Shaouly Bar-Shalom🇮🇱 · Gad Eilam🇮🇱 · Amarjit Soni🇺🇸

    We study the impact of R-parity violating Supersymmetry (RPV SUSY) on the 125 GeV Higgs production and decay modes at the LHC. We assume a heavy SUSY spectrum with multi-TeV squarks and SU(2) scalar singlets as well as the decoupling limit in the SUSY Higgs sector. In this case the lightest CP-even Higgs is SM-like when R-parity is conserved. In contrast, we show that when R-parity violating interactions are added to the SUSY framework, significant deviations may occur in some production and decay channels of the 125 GeV Higgs-like state. Indeed, we assume a single-flavor (mostly third generation) Bilinear RPV (BRPV) interactions, which generate Higgs-sneutrino mixing, lepton-chargino mixing and neutrino-neutralino mixing, and find that notable deviations of $\mathcal{O}(20-30\%)$ may be expected in the Higgs signal strength observables in some channels, e.g., in $pp\to h\to {\mu }^{+}{\mu }^{-},{\tau }^{+}{\tau }^{-}$. Moreover, we find that new and detectable signals associated with BRPV Higgs decays to gauginos, $h\to {\nu }_{\tau }{\tilde{\chi }}_2^0$ and $h\to {\tau }^{\pm }{\chi }_2^{\mp }$, may also arise in this scenario. These decays yield a typical signature of $h\to {\tau }^{\pm }{\ell }^{\mp }+/E_T$ ($\ell =e,\mu ,\tau$) that can be much larger than in the SM, and may also be accompanied by an $\mathcal{O}(20-30\%)$ enhancement in the di-photon signal $pp\to h\to \gamma \gamma$. We also examine potential interesting signals of Trilinear R-parity violation (TRPV) interactions in the production and decays of the Higgs-sneutrino BRPV mixed state (assuming it is the 125 GeV scalar) and show that, in this case also, large deviations up to $\mathcal{O}(100\%)$ are expected in e.g., $pp\to h\to {\mu }^{+}{\mu }^{-},{\tau }^{+}{\tau }^{-}$, which are sensitive to the BRPV$\times$TRPV coupling product.

    hep-phPRD(2019)·9 citations
14. 14*

    Ultra light Thomas-Fermi Dark Matter

    K. Pal🇺🇸 · L. V. Sales🇺🇸 · J. Wudka🇺🇸

    We investigate the viability of a simple dark matter (DM) model consisting of a single fermion in the context of galactic dynamics. We use a consistent approach that does not presume a particular DM density profile but instead requires that the DM+baryon system is in hydrostatic equilibrium. Using a phenomenological baryon density profile, the model then predicts the DM distribution with a core like behavior close to the galactic center. The presence of supermassive black holes (SMBHs) in the center of large galaxies arises naturally in this framework. Using data from a set of large elliptical and spiral galaxies, and from a small set of dwarf galaxies, we find that the model can explain most of the bulk galactic properties, as well as some of the features observed in the rotation curves, provided the DM mass is in the $\mathcal{O}$(50 eV) range. More precise tests of the model require better modeling of the baryon profile and better control on the uncertainties in the data.

    ↳ astro-ph.GAastro-ph.COhep-phPRD(2019)·10 citations
15. 15*

    Photoproduction Reactions and Non-Strange Baryon Spectroscopy

    David G. Ireland🇬🇧 · Eugene Pasyuk🇺🇸 · Igor Strakovsky🇺🇸

    We review the last two decades of using photon beams to measure the production of mesons, and in particular the information that can be obtained on the spectrum of light, non-strange baryons. This is a compendium of experimental results, which should be used as a complement to theoretical reviews of the subject. Lists of data sets are given, together with a comprehensive set of references. An indication of the impact of the data is presented with a summary of the results.

    ↳ nucl-exhep-exhep-phPPNP(2020)·68 citations
16. 16*

    Ultraviolet to Infrared Evolution and Nonperturbative Behavior of $\mathrm{SU}(N)\otimes \mathrm{SU}(N-4)\otimes \mathrm{U}(1)$ Chiral Gauge Theories

    Thomas A. Ryttov🇩🇰 · Robert Shrock🇺🇸

    We analyze the ultraviolet to infrared evolution and nonperturbative properties of asymptotically free $\mathrm{SU}(N)\otimes \mathrm{SU}(N-4)\otimes \mathrm{U}(1)$ chiral gauge theories with $N_f$ copies of chiral fermions transforming according to $([2{]}_N,1{)}_{N-4}+([\bar{1}{]}_N,[\bar{1}{]}_{N-4}{)}_{-(N-2)}+(1,(2{)}_{N-4}{)}_N$, where $[k{]}_N$ and $(k{)}_N$ denote the antisymmetric and symmetric rank-$k$ tensor representations of SU($N$) and the rightmost subscript is the U(1) charge. We give a detailed discussion for the lowest nondegenerate case, $N=6$. These theories can exhibit both self-breaking of a strongly coupled gauge symmetry and induced dynamical breaking of a weakly coupled gauge interaction symmetry due to fermion condensates produced by a strongly coupled gauge interaction. A connection with the dynamical breaking of $\mathrm{SU}(2{)}_L\otimes \mathrm{U}(1{)}_Y$ electroweak gauge symmetry by the quark condensates $⟨\bar{q}q⟩$ due to color SU(3)${}_c$ interactions is discussed. We also remark on direct-product chiral gauge theories with fermions in higher-rank tensor representations.

    ↳ hep-thhep-phPRD(2019)·3 citations
17. 17*

    Establishing a relativistic model for atomic gravimeters

    Ya-jie Wang🇨🇳 · Yu-Jie Tan🇨🇳 · Cheng-Gang Shao🇨🇳

    This work establishes a high-precision relativistic theoretical model: start from studying finite speed of light effect based on a coordinate transformation, and further extend the research methods to analyze the overall relativistic effects. This model promotes the development of testing General Relativity with atomic interferometry.

    ↳ physics.atom-phhep-ph1 citation
18. 18*

    Some Features of Semiclassical Chiral Transport in Rotating Frames

    O.F. Dayi🇹🇷 · E. Kilincarslan🇹🇷

    Semiclassical chiral kinetic theories in the presence of electromagnetic fields as well as vorticity can be constructed by means of some different relativistic or nonrelativistic approaches. To cover the noninertial features of rotating frames one can start from the modified quantum kinetic equation of Wigner function in Minkowski spacetime. It provides a relativistic chiral transport equation whose nonrelativistic limit yields a consistent three-dimensional kinetic theory which does not depend explicitly on spatial coordinates. Recently a chiral transport equation in curved spacetime has been proposed and its nonrelativistic limit in rotating coordinates was considered in the absence of electromagnetic fields. We show that the modified theory can be extended to curved spacetime. The related particle current density and chiral transport equation for an inertial observer in the rotating frame are derived. A novel three-dimensional chiral kinetic transport equation is established by inspecting the nonrelativistic limit of the curved spacetime approach in the rotating frame for a comoving observer in the presence of electromagnetic fields. It explicitly depends on spatial coordinates. We prove that it is consistent with the chiral anomaly, chiral magnetic and vortical effects.

    ↳ hep-thhep-phnucl-thPRD(2019)·6 citations
19. 19*

    Constraints on 3- and 4-loop $\beta$-functions in a general four-dimensional Quantum Field Theory

    Colin Poole🇩🇰 · Anders Eller Thomsen🇩🇰

    The $\beta$-functions of marginal couplings are known to be closely related to the $A$-function through Osborn's equation, derived using the local renormalization group. It is possible to derive strong constraints on the $\beta$-functions by parametrizing the terms in Osborn's equation as polynomials in the couplings, then eliminating unknown $\tilde{A}$ and $T_{IJ}$ coefficients. In this paper we extend this program to completely general gauge theories with arbitrarily many Abelian and non-Abelian factors. We detail the computational strategy used to extract consistency conditions on $\beta$-functions, and discuss our automation of the procedure. Finally, we implement the procedure up to 4-, 3-, and 2-loops for the gauge, Yukawa and quartic couplings respectively, corresponding to the present forefront of general $\beta$-function computations. We find an extensive collection of highly non-trivial constraints, and argue that they constitute an useful supplement to traditional perturbative computations; as a corollary, we present the complete 3-loop gauge $\beta$-function of a general QFT in the $\overline{\text{MS}}$ scheme, including kinetic mixing.

    ↳ hep-thhep-phJHEP(2019)·75 citations
20. 20*

    B-mode Targets

    Renata Kallosh🇺🇸 · Andrei Linde🇺🇸

    The CMB-S4 Science Book, Astro2020 Science White Paper on gravitational waves, and PICO report contain an extensive discussion of many ongoing and planned efforts in the search for gravitational waved produced by inflation. Here we give a short executive summary of the results obtained in our recent papers, which specify the simplest available inflationary models providing physically motivated targets for these searches. Our conclusions are specific for the $10^{-3}\lesssim r\lesssim 10^{-2}$ range, where we present the B-mode benchmarks of the U-duality symmetric class of $\alpha$-attractors, and for $r\lesssim 10^{-3}$, where we present B-mode targets, for which the future precision measurements of $n_s$ will be decisive. We show that a combination of the simplest $\alpha$-attractors and KKLTI models of D-brane inflation covers most of the area favored by Planck 2018.

    ↳ astro-ph.COgr-qchep-phhep-thPLB(2019)·32 citations
21. 21*

    Constraining primordial black hole masses with the isotropic gamma ray background

    Alexandre Arbey🇫🇷 · Jérémy Auffinger🇫🇷 · Joseph Silk🇫🇷

    Primordial black holes can represent all or most of the dark matter in the window $10^{17}-10^{22}$g. Here we present an extension of the constraints on PBHs of masses $10^{13}-10^{18}$g arising from the isotropic diffuse gamma ray background. Primordial black holes evaporate by emitting Hawking radiation that should not exceed the observed background. Generalizing from monochromatic distributions of Schwarzschild black holes to extended mass functions of Kerr rotating black holes, we show that the lower part of this mass window can be closed for near-extremal black holes.

    ↳ astro-ph.COastro-ph.HEhep-phPRD(2020)·118 citations
22. 22*

    Recent progress on probing Lorentz violation at HUST

    Ya-Fen Chen🇨🇳 · Yu-Jie Tan🇨🇳 · Cheng-Gang Shao🇨🇳

    This work mainly introduces the recent experimental process on probing the effect of Lorentz violation (LV) at d = 6, which is a specially striped-type structure experiment to increase the signal of LV. Besides, we also proposed a new experimental design using the striped geometry with triplex modulation to independently constrain the 14 LV coefficients with a higher sensitivity.

    ↳ hep-exhep-phphysics.ins-det1 citation

* 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.