Tue·Jan 23, 2018Tuesday·January 23, 2018

1. 01*

   Exclusivity of p-N interactions within p-A collisions

   Thomas A. Trainor🇺🇸

   A geometric Glauber model applied to p-p or p-A collisions assumes that participant partons within a projectile nucleon independently follow eikonal trajectories, just as for projectile nucleons within target nuclei, and interact independently with any target nucleons encountered along their trajectory. A noneikonal quadratic relation for dijet production observed for p-p collisions suggests that such assumptions for p-N collisions may be incorrect. Data from p-A collisions supports that conclusion. For both isolated p-p collisions and for p-N interactions within p-A collisions a proton projectile interacts with only a single target nucleon within a brief time interval. Multiple overlapping p-N collisions are inhibited, suggesting the exclusivity of p-N interactions within p-A collisions.

   hep-ph17 citations
2. 02*

   Discovery potential of the NMSSM CP-odd Higgs at the LHC

   M. Almarashi🇸🇦

   In this paper we examine the LHC discovery potential of the lightest CP-odd Higgs boson, a1, of the NMSSM produced in gluon fusion channel gg->a1. We evaluate the inclusive signal rates of the a1 for a variety of decay channels and discuss its possible discovery. It is observed that the overall production and decay rates at inclusive level are quite sizable and should help extracting the a1 signal over some regions of the NMSSM parameter space.

   hep-phResults Phys.(2018)·6 citations
3. 03*

   Beautiful mathematics for beauty-full and other multi-heavy hadronic systems

   K. Azizi🇹🇷 · A. R. Olamaei🇮🇷 · S. Rostami🇮🇷

   In most non-perturbative methods in hadron physics the calculations are started with a correlation function in terms of some interpolating and transition currents in $x$-space. For simplicity, the calculations are then transformed to the momentum space by a Fourier transformation. To suppress the contributions of the higher states and continuum; and enhance the ground state contribution, Borel transformation as well as continuum subtraction are applied by the help of quark-hadron duality assumption. In the present study we work out the mathematics required for these processes in the case of light and multi-heavy hadrons. We address a well-known problem in subtraction of the effects of the higher states and continuum and discuss how we find finite results without any divergence by using an appropriate representation of the modified Bessel functions, appearing in the heavy quark propagator, and successive applications of the Borel transformations, which lead to more suppression of the higher states and continuum contributions. The results obtained can be used in determination of the spectroscopic and decay properties of the multi-heavy standard and non-conventional (exotic) systems in many non-perturbative methods, specially the QCD sum rules.

   hep-phmath-phmath.MPEPJA(2018)·20 citations
4. 04*

   NNLL resummation for the associated production of a top pair with a heavy boson at the LHC

   Alessandro Broggio🇩🇪

   In this presentation we review recent results on the resummation of soft gluon emission corrections for the associated production of a top-quark pair with a heavy boson (Higgs/W/Z) at the Large Hadron Collider (LHC). We develop a parton level Monte Carlo based on a soft-gluon resummation formula valid up to next-to-next-to-leading logarithmic (NNLL) accuracy. With this tool we study the impact of the newly computed corrections to the total cross sections and some important differential distributions.

   hep-phPoS(2018)·2 citations
5. 05*

   Charm production in interactions of antiproton with proton and nuclei at $\bar{P}ANDA$ energies

   R. Shyam🇮🇳 · K. Tsushima🇧🇷

   We study the production of charmed baryons in the antiproton-proton and antiproton-nucleus interactions within a fully covariant model that is based on an effective Lagrangian approach. The baryon production proceeds via the $t$-channel $D^0$ and $D^{\ast 0}$ meson-exchange diagrams. We have also explored the production of the charm-baryon hypernucleus ${}_{{\Lambda }_c^{+}}^{16}$O in the antiproton - ${}^{16}$O collisions. For antiproton beam momenta of interest to the $\bar{P}ANDA$ experiment, the 0${}^{\circ }$ differential cross sections for the formation of ${}_{{\Lambda }_c^{+}}^{16}$O hypernuclear states with simple particle-hole configurations, have magnitudes in the range of a few $\mu$b/sr.

   hep-phhep-exnucl-exnucl-thFew Body Syst.(2018)·4 citations
6. 06*

   The longitudinal leading-twist distribution amplitude of $J/\psi$ meson within background field theory

   Hai-Bing Fu🇨🇳 · Long Zeng🇨🇳 · Wei Cheng🇨🇳 · Tao Zhong🇨🇳 · Xing-Gang Wu🇨🇳

   We make a detailed study on the $J/\psi$ meson longitudinal leading-twist distribution amplitude ${\varphi }_{2;J/\psi }^{\Vert }$ by using the QCD sum rules within the background field theory. By keeping all the non-perturbative condensates up to dimension-six, we obtain accurate QCD sum rules for the moments $⟨{\xi }_{n;J/\psi }^{\Vert }⟩$. The first three ones are $⟨{\xi }_{2;J/\psi }^{\Vert }⟩=0.083(12)$, $⟨{\xi }_{4;J/\psi }^{\Vert }⟩=0.015(5)$ and $⟨{\xi }_{6;J/\psi }^{\Vert }⟩=0.003(2)$, leading to a single peaked behavior for ${\varphi }_{2;J/\psi }^{\Vert }$ which is sharper than the previous ones around the region of $x\sim 0.5$. As an application, we adopt the QCD light-cone sum rules to calculate the $B_c$ meson semileptonic decay $B_c^{+}\to J/\psi {\ell }^{+}{\nu }_{\ell }$. We obtain $\Gamma (B_c^{+}\to J/\psi {\ell }^{+}{\nu }_{\ell })=(89.67_{-19.06}^{+24.76})\times 10^{-15}\mathrm{GeV}$ and $\Re (J/\psi {\ell }^{+}{\nu }_{\ell })=0.217_{-0.057}^{+0.069}$, which agree with the next-to-leading order pQCD prediction and the new CDF measurement within errors.

   hep-phPRD(2018)·16 citations
7. 07*

   Next-to-leading order QCD and electroweak corrections to Higgs-strahlung processes at the LHC

   Pazilet Obul🇨🇳 · Sayipjamal Dulat🇨🇳 · Tie-Jiun Hou🇨🇳 · Ablikim Tursun🇨🇳 · Nijat Yalkun🇨🇳

   In this paper we calculate the total and fiducial cross sections as well as differential distributions for the Higgs-strahlung or VH process $pp\to VH\to l{\nu }_l/l^{-}{l}^{+}+H$, (V = W or Z, l=e,$\mu$) including QCD and electro-weak corrections up to next-to-leading order before and after reweighting photon PDFs of NNPDF2.3qed, NNPDF3.0qed, MRST2004qed, CT14QEDinc, and LUXqed at the LHC with 13 TeV and Higgs boson mass $M_H=125$ GeV. The predictions from the various photon PDFs before and after reweighting against each other are in good agreement. The photon PDF uncertainties of the photon-induced cross sections decrease significantly with the reweighting PDFs.

   hep-phCPC(2018)·16 citations
8. 08*

   Chiral symmetry breaking and monopoles in gauge theories

   Adith Ramamurti🇺🇸 · Edward Shuryak🇺🇸

   QCD monopoles are magnetically charged quasiparticles whose Bose-Einstein condensation (BEC) at $T<T_c$ creates electric confinement and flux tubes. The "magnetic scenario" of QCD proposes that scattering on the non-condensed component of the monopole ensemble at $T>T_c$ plays an important role in explaining the properties of strongly coupled quark-gluon plasma (sQGP) near the deconfinement temperature. In this paper, we study the phenomenon of chiral symmetry breaking and its relation to magnetic monopoles. Specifically, we study the eigenvalue spectrum of the Dirac operator in the basis of fermionic zero modes in an SU(2) monopole background. We find that as the temperature approaches the deconfinement temperature $T_c$ from above, the eigenvalue spectrum has a finite density at $\omega =0$, indicating the presence of a chiral condensate. In addition, we find the critical scaling of the eigenvalue gap to be consistent with that of the correlation length in the 3d Ising model and the BEC transition of monopoles on the lattice.

   hep-phnucl-thPRD(2019)·6 citations
9. 09*

   Implications of new physics in the decays $B_c\to (J/\psi ,{\eta }_c)\tau \nu$

   Chien-Thang Tran🇷🇺 · Mikhail A. Ivanov🇷🇺 · Jürgen G. Körner🇩🇪 · Pietro Santorelli🇮🇹

   We study the semileptonic decays of the $B_c$ meson into final charmonium states within the standard model and beyond. The relevant hadronic transition form factors are calculated in the framework of the covariant confined quark model developed by us. We focus on the tau mode of these decays, which may provide some hints of new physics effects. We extend the standard model by assuming a general effective Hamiltonian describing the $b\to c\tau \nu$ transition, which consists of the full set of the four-fermion operators. We then obtain experimental constraints on the Wilson coefficients corresponding to each operator and provide predictions for the branching fractions and other polarization observables in different new physics scenarios.

   hep-phPRD(2018)·93 citations
10. 10*

    Degenerate Vacua of the Universe and What Comes Beyond the Standard Model

    B.G. Sidharth🇮🇳 · C.R. Das🇷🇺 · C.D. Froggatt🇬🇧 · H.B. Nielsen🇩🇰 · Larisa Laperashvili🇷🇺

    We present a new cosmological model of the Universe based on the two discoveries: 1. cosmological constant is very small, and 2. Nature shows a new law in physics called "Multiple Point Principle" (MPP). The MPP predicts the two degenerate vacua of the Universe with VEV $v_1\approx 246$ Gev and $v_2\sim 10^{18}$ GeV, which provide masses of the Higgs boson and top-quark. A new cosmological model assumes the formation of two universal bubbles. The Universe at first stage of its existing is a bubble with a de-Sitter spacetime inside, having black-holes-hedgehogs as topological defects of the vacuum. Such a bubble has a "false vacuum" with VEV $v_2$, which decays very quickly. Cooling Universe has a new phase transition, transforming the "false" vacuum to the "true" (Electroweak) vacuum. Hedgehogs confined, and the universal bubble is transformed into the bubble having spacetime with FLRW-metric and the vacuum with new topological defects of $U(1{)}_{(el-mag)}$ group: magnetic vortices and Sidharth's pointlike defects. The problem of stability/metastability of the EW-vacuum is investigated. Noncommutativity of the vacua spacetime manifold is discussed. The prediction of a new physics is given by the future observations at LHC of the triplet $SU(2)$ Higgs bosons (at energies $E\sim 10$ TeV), and/or of the new bound states $6t+6\bar{t}$ formed by top-antitop quarks (at $E\sim 1$ TeV). The problem "What comes beyond the Standard Model" is discussed at the end of this paper.

    hep-ph3 citations
11. 11*

    Comment on high-$p_T$ inclusive spectra measurements at the LHC

    S.M. Troshin🇷🇺 · N.E. Tyurin🇷🇺

    The high-$p_T$ inclusive spectra measured at the LHC demonstrate a non-perturbative $p_T^{-6}$ dependence. This can be related to observation of a nondecreasing with $p_T$ one-spin asymmetries at RHIC questioning the fact of the spin degrees of freedom neglect at the LHC energies.

    hep-phhep-ex0 citations
12. 12*

    Black disk, maximal Odderon and unitarity

    V.A. Khoze🇬🇧 · A.D. Martin🇬🇧 · M.G. Ryskin🇬🇧

    We argue that the so-called maximal Odderon contribution breaks the `black disk' behaviour of the asymptotic amplitude, since the cross section of the events with Large Rapidity Gaps grows faster than the total cross section. That is the `maximal Odderon' is not consistent with the unitarity.

    hep-phPLB(2018)·63 citations
13. 13*

    Disclosing $D^{\ast }{\bar{D}}^{\ast }$ molecular states in the $B_c^{-}\to {\pi }^{-}J/\psi \omega$ decay

    L.R.Dai🇨🇳 · J.M.Dias🇪🇸 · E.Oset🇪🇸

    We study the $B_c^{-}\to {\pi }^{-}J/\psi \omega$ and $B_c^{-}\to {\pi }^{-}{D}^{\ast }{\bar{D}}^{\ast }$ reactions and show that they are related by the presence of two resonances, the $X(3940)$ and $X(3930)$, that are of molecular nature and couple most strongly to $D^{\ast }{\bar{D}}^{\ast }$, but also to $J/\psi \omega$. Because of that, in the $J/\psi \omega$ mass distribution we find a cusp with large strength at the $D^{\ast }{\bar{D}}^{\ast }$ threshold and predict the ratio of strengths between the peak of the cusp and the maximum of the $D^{\ast }{\bar{D}}^{\ast }$ distribution close to $D^{\ast }{\bar{D}}^{\ast }$ threshold, which are distinct features of the molecular nature of these two resonances.

    hep-phEPJC(2018)·10 citations
14. 14*

    Testing spin-2 mediator by angular observables in $b\to s{\mu }^{+}{\mu }^{-}$

    Svjetlana Fajfer🇸🇮 · Blazenka Melic🇭🇷 · Monalisa Patra🇸🇮

    We consider effects of spin-2 particle in the $b\to s{\mu }^{+}{\mu }^{-}$ transition assuming that the spin-2 particle couples in a flavour non-universal way to $b$ and $s$ quarks and in the leptonic sector couples only to the muons, thereby only contributing to the process $b\to s{\mu }^{+}{\mu }^{-}$. The $B_s-{\bar{B}}_s$ transition gives the strong constraint on the coupling of the spin-2 mediator and $b$ and $s$ quarks while the observed discrepancy from the SM prediction for the muon anomalous magnetic moment $(g-2{)}_{\mu }$ serves us to constrain the $\mu$-coupling to spin-2 particle. We find that the spin-2 particle can modify the angular observables in the $B\to K{\mu }^{+}{\mu }^{-}$ and $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decays and produce effects which do not exist in the SM. The generated forward-backward asymmetries in these processes can reach $15\%$, while other observables for these decays receive tiny effects.

    hep-phPRD(2018)·4 citations
15. 15*

    Charged Lepton Flavor Violation in a class of Radiative Neutrino Mass Generation Models

    Talal Ahmed Chowdhury🇧🇩 · Salah Nasri🇦🇪

    We investigate charged lepton flavor violating processes $\mu \to e\gamma$, $\mu \to ee\overline{e}$ and $\mu -e$ conversion in nuclei for a class of three-loop radiative neutrino mass generation models with electroweak multiplets of increasing order. We find that, because of certain cancellations among various one-loop diagrams which give the dipole and non-dipole contributions in effective $\mu e\gamma$ vertex and Z-penguin contribution in effective $\mu eZ$ vertex, the flavor violating processes $\mu \to e\gamma$ and $\mu -e$ conversion in nuclei become highly suppressed compared to $\mu \to ee\overline{e}$ process. Therefore, the observation of such pattern in LFV processes may reveal the radiative mechanism behind neutrino mass generation.

    hep-phPRD(2018)·14 citations
16. 16*

    Self-consistent analysis of hadron production in $pp$ and $AA$ collisions at mid-rapidity

    G.I. Lykasov🇷🇺 · A.I. Malakhov🇷🇺

    The self-consistent approach based on similarity of inclusive spectra of hadrons produced in $pp$ and $AA$ collisions is reviewed. This approach allows us to describe rather well the ratio of proton to anti-proton yields in $AA$ collisions as a function of the initial energy at a wide range from a few GeV to a few TeV. We suggest its modification due to the quark-gluon dynamics to describe the inclusive spectra of hadrons produced in $pp$ collision as a function of the transverse momentum $p_t$ at mid-rapidity. The extension of this approach to analyze the pion $p_t$-spectra produced in $AA$ collision at high and middle energies and mid-rapidity is given. The satisfactory description of experimental data on these spectra in $pp$ and $AA$ collisions within the offered approach is shown.

    hep-phEPJA(2018)·15 citations
17. 17*

    $B$ Meson Anomalies in a Pati-Salam Model within the Randall-Sundrum Background

    Monika Blanke🇩🇪 · Andreas Crivellin🇨🇭

    Lepton number as a fourth color is the intriguing theoretical idea of the famous Pati-Salam (PS) model. While in conventional PS models, the symmetry breaking scale and the mass of the resulting vector leptoquark are stringently constrained by $K_L\to \mu e$ and $K\to \pi \mu e$, the scale can be lowered to a few TeV by adding vector-like fermions. Furthermore, in this case, the intriguing hints for lepton flavour universality violation in $b\to s{\mu }^{+}{\mu }^{-}$ and $b\to c\tau \nu$ processes can be addressed. Such a setup is naturally achieved by implementing the PS gauge group in the five-dimensional Randall-Sundrum background. The PS symmetry is broken by boundary conditions on the fifth dimension and the resulting massive vector leptoquark automatically has the same mass scale as the vector-like fermions and all other resonances. We consider the phenomenology of this model in the context of the hints for lepton flavour universality violation in semileptonic $B$ decays. Assuming flavour alignment in the down sector we find that in $b\to s{\ell }^{+}{\ell }^{-}$ transitions the observed deviations from the SM predictions (including $R(K)$ and $R(K^{\ast })$) can be explained with natural values for the free parameters of the model. Even though we find sizable effects in $R(D)$, $R(D^{\ast })$ and $R(J/\Psi )$ one cannot account for the current central values in the constrained setup of our minimal model due to the stringent constraints from $D-\bar{D}$ mixing and $\tau \to 3\mu$.

    hep-phPRL(2018)·271 citations
18. 18*

    Self-interacting dark matter constraints in a thick dark disk scenario

    Kyriakos Vattis🇺🇸 · Savvas M. Koushiappas (Brown U.)🇺🇸

    A thick dark matter disk is predicted in cold dark matter simulations as the outcome of the interaction between accreted satellites and the stellar disk in Milky Way sized halos. We study the effects of a self-interacting thick dark disk on the energetic neutrino flux from the Sun. We find that for particle masses between 100 GeV and 1 TeV and dark matter annihilation to heavy leptons either the self-interaction may not be strong enough to solve the small scale structure motivation or a dark disk cannot be present in the Milky Way.

    ↳ astro-ph.GAastro-ph.HEhep-phPRD(2018)·6 citations
19. 19*

    Information loss in effective field theory: entanglement and thermal entropies

    Daniel Boyanovsky🇺🇸

    Integrating out high energy degrees of freedom to yield a low energy effective field theory leads to a loss of information with a concomitant increase in entropy. We obtain the effective field theory of a light scalar field interacting with heavy fields after tracing out the heavy degrees of freedom from the time evolved density matrix. The initial density matrix describes the light field in its ground state and the heavy fields in equilibrium at a common temperature $T$. For $T=0$, we obtain the reduced density matrix in a perturbative expansion, it reveals an emergent mixed state as a consequence of the entanglement between light and heavy fields. We obtain the effective action that determines the time evolution of the \emph{reduced} density matrix for the light field in a non-perturbative Dyson resummation of one-loop correlations of the heavy fields. The Von-Neumann \emph{entanglement entropy} associated with the reduced density matrix is obtained for the non-resonant and resonant cases in the asymptotic long time limit. In the non-resonant case the reduced density matrix displays an \emph{incipient} thermalization albeit with a wave-vector, time and coupling dependent \emph{effective temperature} as a consequence of memory of initial conditions. The entanglement entropy is time independent and is the \emph{thermal entropy} for this effective, non-equilibrium temperature. In the resonant case the light field fully \emph{thermalizes} with the heavy fields, the reduced density matrix looses memory of the initial conditions and the entanglement entropy becomes the \emph{thermal entropy} of the light field. We discuss the relation between the entanglement entropy ultraviolet divergences and renormalization.

    ↳ hep-thcond-mat.stat-mechhep-phquant-phPRD(2018)·33 citations
20. 20*

    Combined Constraints on the Equation of State of Dense Neutron-Rich Matter from Terrestrial Experiments and Observations of Neutron Stars

    Nai-Bo Zhang🇨🇳 · Bao-An Li🇺🇸 · Jun Xu🇨🇳

    Within the parameter space of equation of state (EOS) of dense neutron-rich matter limited by existing constraints mainly from terrestrial nuclear experiments, we investigate how the neutron star maximum mass $M_{\max }>2.01\pm 0.04$ M${}_{\odot }$, radius $10.62<R_{1.4}<12.83$ km and tidal deformability ${\Lambda }_{1.4}\le 800$ of canonical neutron stars all together constrain the EOS of dense neutron-rich nucleonic matter. While the 3-D parameter space of $K_{\mathrm{sym}}$ (curvature of nuclear symmetry energy), $J_{\mathrm{sym}}$ and $J_0$ (skewness of the symmetry energy and EOS of symmetric nuclear matter, respectively) are narrowed down significantly by the observational constraints, more data are needed to pin down the individual values of $K_{\mathrm{sym}}$, $J_{\mathrm{sym}}$ and $J_0$ with quantified uncertainties. The $J_0$ largely controls the maximum mass of neutron stars. While the EOS with $J_0=0$ is sufficiently stiff to support neutron stars as massive as 2.37 M${}_{\odot }$, to support the hyperthetical ones as massive as 2.74 M${}_{\odot }$ (composite mass of GW170817) requires $J_0$ to be larger than its currently known maximum value of about 400 MeV and beyond the causality limit. The upper limit on the tidal deformability of ${\Lambda }_{1.4}=800$ from the recent observation of GW170817 is found to provide upper limits on some EOS parameters consistent with but far less restrictive than the existing constraints of other observables studied.

    ↳ nucl-thastro-ph.HEastro-ph.SRhep-ph+1ApJ(2018)·181 citations
21. 21*

    Looking for the phase transition - recent NA61/SHINE results

    Ludwik Turko (for the NA61/SHINE Collaboration)🇵🇱

    The fixed-target NA61/SHINE experiment (SPS CERN) looks for the critical point of strongly interacting matter and the properties of the onset of deconfinement. It is a two dimensional scan of measurements of particle spectra and fluctuations in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size, corresponding to a two dimensional phase diagram (temperature T - baryonic chemical potential ${\mu }_B$). New NA61/SHINE results are presented here, such as transverse momentum and multiplicity fluctuations in Ar+Sc collisions compared to NA61/SHINE p+p and Be+Be data, as well as to earlier NA49 A+A results. Recently, a preliminary signature for the new size dependent effect - rapid changes in system size dependence was observed in NA61-SHINE data, labeled as percolation threshold or onset of fireball. This would be closely related to the vicinity of the hadronic phase transition region.

    ↳ hep-exhep-phUniverse(2018)·20 citations
22. 22*

    Majorana neutrino and the vacuum of Bogoliubov quasiparticle

    Kazuo Fujikawa🇯🇵

    The Lagrangian of the seesaw mechanism is C violating but the same Lagrangian when re-written in terms of Majorana neutrinos is manifestly C invariant. To resolve this puzzling feature, a relativistic analogue of Bogoliubov transformation, which preserves CP but explicitly breaks C and P separately, was introduced together with the notions of a Bogoliubov quasiparticle and an analogue of the energy gap in BCS theory. The idea of Majorana neutrino as Bogoliubov quasiparticle was then suggested. In this paper, we study the vacuum structure of the Bogoliubov quasiparticle which becomes heavy by absorbing the C-breaking. By treating an infinitesimally small C violating term as an analogue of the chiral symmetry breaking nucleon mass in the model of Nambu and Jona-Lasinio, we construct an explicit form of the vacuum of the Bogoliubov quasiparticle which defines Majorana neutrinos in seesaw mechanism. The vacuum of the Bogoliubov quasiparticle thus constructed has an analogous condensate structure as the vacuum of the quasiparticle (nucleon) in the Nambu--Jona-Lasinio model.

    ↳ hep-thhep-phPLB(2018)·6 citations
23. 23*

    Neutrino-nucleon scattering in the neutrino-sphere

    Paulo F. Bedaque🇺🇸 · Sanjay Reddy🇺🇸 · Srimoyee Sen🇺🇸 · Neill C. Warrington🇺🇸

    We calculate the differential scattering rate for thermal neutrinos in a hot and dilute gas of interacting neutrons using linear response theory. The dynamical structure factors for density and spin fluctuations of the strongly interacting neutron matter, expected in the neutrino decoupling regions of supernovae and neutron star mergers, are calculated in the virial expansion for the first time. Correlations due to nucleon-nucleon interactions are taken into account using a pseudo-potential that reproduces measured nucleon-nucleon phase shifts, and we find that attractive s-wave interactions enhance the density response and suppress the spin response of neutron matter. The net effect of neutron correlations is to strongly suppress backscattering. Moreover, we find nearly exact scaling laws for the response functions, valid for the range $T=5-10$ MeV and q < 30 MeV, allowing us to obtain analytic results for the dynamic structure factors at second-order in the fugacity of the neutron gas. We find that the modification of scattering rates depends on the energy and momentum exchanged, implying that dynamical structure factors are essential to describe neutrino decoupling in supernovae and neutron star mergers.

    ↳ nucl-thastro-ph.HEhep-phPRC(2018)·13 citations
24. 24*

    Calculation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment

    T. Blum🇺🇸 · P.A. Boyle🇬🇧 · V. Gülpers🇬🇧 · T. Izubuchi🇺🇸 · L. Jin🇺🇸 · C. Jung🇺🇸 · A. Jüttner🇬🇧 · C. Lehner🇺🇸 · A. Portelli🇬🇧 · J.T. Tsang🇬🇧

    We present a first-principles lattice QCD+QED calculation at physical pion mass of the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. The total contribution of up, down, strange, and charm quarks including QED and strong isospin breaking effects is found to be $a_{\mu }^{\mathrm{HVP}\mathrm{LO}}=715.4(16.3)(9.2)\times 10^{-10}$, where the first error is statistical and the second is systematic. By supplementing lattice data for very short and long distances with experimental R-ratio data using the compilation of Ref. [1], we significantly improve the precision of our calculation and find $a_{\mu }^{\mathrm{HVP}\mathrm{LO}}=692.5(1.4)(0.5)(0.7)(2.1)\times 10^{-10}$ with lattice statistical, lattice systematic, R-ratio statistical, and R-ratio systematic errors given separately. This is the currently most precise determination of the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. In addition, we present the first lattice calculation of the light-quark QED correction at physical pion mass.

    ↳ hep-lathep-phPRL(2018)·518 citations
25. 25*

    Valence-quark structure N* resonances from DSEs

    Jorge Segovia🇪🇸

    We present a unified Quantum Chromodynamics (QCD)-based description of elastic and transition electromagnetic form factors involving the nucleon and its resonances. We compare predictions made using a framework built upon a Faddeev equation kernel and interaction vertices that possess QCD-like momentum dependence with results obtained using a confining, symmetry-preserving treatment of a vector$\otimes$vector contact-interaction in a widely-used leading-order (rainbow-ladder) truncation of QCD's Dyson-Schwinger equations. This comparison explains that the contact-interaction framework produces hard form factors, curtails some quark orbital angular momentum correlations within a baryon, and suppresses two-loop diagrams in the elastic and transition electromagnetic currents. Such defects are rectified in our QCD-based approach and, by contrasting the results obtained for the same observables in both theoretical schemes, shows those objects which are most sensitive to the momentum dependence of elementary quantities in QCD.

    ↳ nucl-thhep-exhep-lathep-phFew Body Syst.(2018)·0 citations
26. 26*

    Chiral Gravitational Waves and Baryon Superfluid Dark Matter

    Stephon Alexander🇺🇸 · Evan McDonough🇺🇸 · David N. Spergel🇺🇸

    We develop a unified model of darkgenesis and baryogenesis involving strongly interacting dark quarks, utilizing the gravitational anomaly of chiral gauge theories. In these models, both the visible and dark baryon asymmetries are generated by the gravitational anomaly induced by the presence of chiral primordial gravitational waves. We provide a concrete model of an SU(2) gauge theory with two massless quarks. In this model, the dark quarks condense and form a dark baryon charge superfluid (DBS), in which the Higgs-mode acts as cold dark matter. We elucidate the essential features of this dark matter scenario and discuss its phenomenological prospects.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2018)·59 citations
27. 27*

    Galaxy Bispectrum from Massive Spinning Particles

    Azadeh Moradinezhad Dizgah🇺🇸 · Hayden Lee🇺🇸 · Julian B. Muñoz🇺🇸 · Cora Dvorkin🇺🇸

    Massive spinning particles, if present during inflation, lead to a distinctive bispectrum of primordial perturbations, the shape and amplitude of which depend on the masses and spins of the extra particles. This signal, in turn, leaves an imprint in the statistical distribution of galaxies; in particular, as a non-vanishing galaxy bispectrum, which can be used to probe the masses and spins of these particles. In this paper, we present for the first time a new theoretical template for the bispectrum generated by massive spinning particles, valid for a general triangle configuration. We then proceed to perform a Fisher-matrix forecast to assess the potential of two next-generation spectroscopic galaxy surveys, EUCLID and DESI, to constrain the primordial non-Gaussianity sourced by these extra particles. We model the galaxy bispectrum using tree-level perturbation theory, accounting for redshift-space distortions and the Alcock-Paczynski effect, and forecast constraints on the primordial non-Gaussianity parameters marginalizing over all relevant biases and cosmological parameters. Our results suggest that these surveys would potentially be sensitive to any primordial non-Gaussianity with an amplitude larger than $f_{\mathrm{NL}}\approx 1$, for massive particles with spins 2, 3, and 4. Interestingly, if non-Gaussianities are present at that level, these surveys will be able to infer the masses of these spinning particles to within tens of percent. If detected, this would provide a very clear window into the particle content of our Universe during inflation.

    ↳ astro-ph.COhep-phJCAP(2018)·105 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.