Fri·Jun 14, 2019Friday·June 14, 2019

1. 01*

   Towards the nucleon hadronic tensor from lattice QCD

   Jian Liang🇺🇸 · Terrence Draper🇺🇸 · Keh-Fei Liu🇺🇸 · Alexander Rothkopf🇳🇴 · Yi-Bo Yang🇨🇳

   We present the first calculation of the hadronic tensor on the lattice for the nucleon. The hadronic tensor can be used to extract the structure functions in deep inelastic scatterings and also provide information for the neutrino-nucleon scattering which is crucial to the neutrino-nucleus scattering experiments at low energies. The most challenging part in the calculation is to solve an inverse problem. We have implemented and tested three algorithms using mock data, showing that the Bayesian Reconstruction method has the best resolution in extracting peak structures while the Backus-Gilbert and Maximum Entropy methods are somewhat more stable for the flat spectral function. Numerical results are presented for both the elastic case (clover fermions on domain wall configuration with $m_{\pi }\sim$ 370 MeV and $a\sim$ 0.06 fm) and a case (anisotropic clover lattice with $m_{\pi }\sim$ 380 MeV and $a_t\sim$ 0.035 fm) with large momentum transfer. For the former case, the reconstructed Minkowski hadronic tensor gives precisely the vector charge which proves the feasibility of the approach. While for the latter case, the nucleon resonances and possibly shallow inelastic scattering contributions around $\nu =1$ GeV are clearly observed but no information is obtained for higher excited states with $\nu >2$ GeV. A check of the effective masses of $\rho$ meson with different lattice setups indicates that, in order to reach higher energy transfers, using lattices with smaller lattice spacings is essential.

   hep-phhep-latPRD(2020)·80 citations
2. 02*

   Dynamical Friction in Interacting Relativistic Systems

   Andrey Katz🇨🇭 · Aleksi Kurkela🇨🇭 · Alexander Soloviev🇦🇹

   We study dynamical friction in interacting relativistic systems with arbitrary mean free paths and medium constituent masses. Our novel framework recovers the known limits of ideal gas and ideal fluid when the mean free path goes to infinity or zero, respectively, and allows for a smooth interpolation between these limits. We find that in an infinite system the drag force can be expressed as a sum of ideal-gas-like and ideal-fluid-like contributions leading to a finite friction even at subsonic velocities. This simple picture receives corrections in any finite system and the corrections become especially significant for a projectile moving at a velocity $v$ close to the speed of sound $v\approx c_s$. These corrections smoothen the ideal fluid discontinuity around the speed of sound and render the drag force a continuous function of velocity. We show that these corrections can be computed to a good approximation within effective theory of viscous fluid dynamics.

   hep-phastro-ph.GAgr-qcJCAP(2019)·7 citations
3. 03*

   Theoretical uncertainties for electroweak and Higgs-boson precision measurements at FCC-ee

   A. Freitas🇺🇸 · S. Heinemeyer🇪🇸 · M. Beneke🇩🇪 · A. Blondel🇨🇭 · S. Dittmaier🇩🇪 · J. Gluza🇵🇱 · A. Hoang🇦🇹 · S. Jadach🇵🇱 · P. Janot🇨🇭 · J. Reuter🇩🇪 · T. Riemann🇵🇱 · C. Schwinn🇩🇪 · M. Skrzypek🇵🇱 · S. Weinzierl🇩🇪

   Due to the high anticipated experimental precision at the Future Circular Collider FCC-ee (or other proposed $e^{+}{e}^{-}$ colliders, such as ILC, CLIC, or CEPC) for electroweak and Higgs-boson precision measurements, theoretical uncertainties may have, if unattended, an important impact on the interpretation of these measurements within the Standard Model (SM), and thus on constraints on new physics. Current theory uncertainties, which would dominate the total uncertainty, need to be strongly reduced through future advances in the calculation of multi-loop radiative corrections together with improved experimental and theoretical control of the precision of SM input parameters. This document aims to provide an estimate of the required improvement in calculational accuracy in view of the anticipated high precision at the FCC-ee. For the most relevant electroweak and Higgs-boson precision observables we evaluate the corresponding quantitative impact.

   hep-phhep-ex75 citations
4. 04*

   Study of jet-medium interactions using jet shape observables in heavy ion collisions at LHC energies with JEWEL

   Rathijit Biswas🇮🇳 · Subikash Choudhury🇨🇳 · Sidharth Kumar Prasad🇮🇳 · Supriya Das🇮🇳

   Based on a pQCD inspired dynamical model of jet-medium interactions, Jewel, we have studied possible modifications to inclusive jet yields and a set of jet shape observables, namely, the fragmentation functions and radial momentum distributions when jets propagate through a deconfined partonic medium created in collisions of heavy nuclei at Large Hadron Collider (LHC) energies. Jets are reconstructed with anti-k T algorithm in the pseudorapidity range $|{\eta }_{\mathrm{jet}}|<2.1$ for resolution parameter R= 0.2, 0.3 and 0.4. For background subtraction, a Jewel-compatible 4-Momenta subtraction technique (4MomSub) have been used. The modification of inclusive jet-yields in Pb-Pb collisions relative to proton-proton interactions, quantified by $R_{AA}^{\mathrm{jet}}$, are seen to be in reasonable agreement with ALICE, ATLAS and CMS data over a broad transverse momentum range. Jewel is able to capture the qualitative features of the modifications to the fragmentation functions and radial momentum distributions in data but not always quantitatively. This quantitative discrepancy may be related to the simplified treatment of recoil partons in the background model and partly due to background subtraction procedure itself. Nevertheless, observed modification of jet shape variables in Jewel corroborates the fact that in-medium fragmentation is harder and more collimated than the fragmentation in vacuum. We further observe that these modifications depend on the transverse momentum of jets and it seems that medium resolves the core structure of low momentum jets below 100 GeV/c at LHC energies.

   hep-phJ.Phys.G(2019)·2 citations
5. 05*

   $\bar{K}\Lambda$ molecular explanation to the newly observed $\Xi (1620{)}^0$

   Kan Chen🇨🇳 · Rui Chen🇨🇳 · Zhi-Feng Sun🇨🇳 · Xiang Liu🇨🇳

   The newly observed $\Xi (1620{)}^0$ by the Belle Collaboration inspires our interest in performing a systematic study on the interaction of an anti-strange meson $({\bar{K}}^{(\ast )})$ with a strange or doubly strange ground octet baryon $\mathcal{B}$ ($\Lambda$, $\Sigma$, and $\Xi$), where the spin-orbit force and the recoil correction are considered in the adopted one-boson-exchange model. Our results indicate that $\Xi (1620{)}^0$ can be explained as a $\bar{K}\Lambda$ molecular state with $I(J^P)=1/2(1/2^{-})$ and the intermediate force from $\sigma$ exchange plays an important role. Additionally, we also predict several other possible molecular candidates, i.e., the $\bar{K}\Sigma$ molecular state with $I(J^P)=1/2(1/2^{-})$ and the triply strange $\bar{K}\Xi$ molecular state with $I(J^P)=0(1/2^{-})$.

   hep-phPRD(2019)·18 citations
6. 06*

   Next-to-leading order QCD corrections for single top-quark production in association with two jets

   Stefan Mölbitz🇩🇪 · Le Duc Ninh🇻🇳 · Peter Uwer🇩🇪

   In this article we calculate the next-to-leading order (NLO) QCD corrections for single on-shell top-quark production in association with two jets at proton-proton colliders. The tW channel is assumed to be measured independently. The QCD corrections to the inclusive cross section are about 28 (22)\% for top (anti-top) quark production at the 13 TeV LHC. Theoretical errors are dominated by scale uncertainties, which are found to be around 5\% at NLO. Results for various kinematical distributions are also provided using a well-motivated dynamical scale. The QCD corrections are found to have a non-trivial dependence on the phase-space.

   hep-phhep-exPRD(2020)·4 citations
7. 07*

   Triplet Leptogenesis, Type-II Seesaw Dominance, Intrinsic Dark Matter, Vacuum Stability and Proton Decay in Minimal SO(10) Breakings

   Mainak Chakraborty🇮🇳 · M.K. Parida🇮🇳 · Biswonath Sahoo (SOA Deemed to be Univ.)🇮🇳

   We implement type-II seesaw dominance for neutrino mass and baryogenesis through heavy scalar triplet leptogenesis in a class of minimal non-supersymmetric SO(10) models where matter parity as stabilising discrete symmetry as well as WIMP dark matter (DM) candidates are intrinsic predictions of the GUT symmetry. We also find modifications of relevant CP-asymmetry formulas in such minimal models. Baryon asymmetry of the universe as solutions of Boltzmann equations is further shown to be realized for both normal and inverted mass orderings in concordance with cosmological bound and best fit values of the neutrino oscillation data including ${\theta }_{23}$ in the second octant and large values of leptonic Dirac CP-phases. Type-II seesaw dominance is at first successfully implemented in two cases of spontaneous SO(10) breakings through SU(5) route where the presence of only one non-standard Higgs scalar of intermediate mass $\sim 10^9-10^{10}$ GeV achieves unification. Lower values of the SU(5) unification scales $\sim 10^{15}$ GeV are predicted to bring proton lifetimes to the accessible ranges of Super-Kamiokande and Hyper-Kamiokande experiments. Our prediction of WIMP DM relic density in each model is due to a $\sim$ TeV mass matter-parity odd real scalar singlet ($\subset {16}_H\subset$ SO(10)) verifiable by LUX and XENON1T experiments. This DM is also noted to resolve the vacuum stability issue of the standard scalar potential. When applied to the unification framework of M. Frigerio and T. Hambye, in addition to the minimal fermionic triplet DM solution of $2.7$ TeV mass, this procedure of type-II seesaw dominance and triplet leptogenesis is also found to make an alternative prediction of triplet fermion plus real scalar singlet DM at the TeV scale.

   hep-phJCAP(2020)·22 citations
8. 08*

   A comparative study of the $S_1$ and $U_1$ leptoquark effects in the light quark regime

   Ilja Doršner🇭🇷 · Svjetlana Fajfer🇸🇮 · Monalisa Patra🇸🇮

   We study the phenomenology of two leptoquarks, the Standard Model $SU(2)$ singlets $S_1$ and $U_1$, with regard to the latest experimental data from the low-energy flavor physics measurements, LHC, and the IceCube neutrino experiment. We consider a scenario when scalar (vector) leptoquark $S_1$ ($U_1$) couples exclusively to the down quark and the neutrinos (charged leptons) of all flavors, where the leptoquark in question couples to the SM lepton doublets. The couplings of $S_1$ ($U_1$) to the up-type quarks and the charged leptons (neutrinos) are in turn uniquely determined via $SU(2)$ symmetry. We find that the most important constraints on the leptoquark parameter space originate from flavor physics measurements, followed by the LHC search limits that take over the flavor physics ones in the large LQ mass regime. We furthermore show that $S_1$ ($U_1$) marginally improves (spoils) the fit of the current IceCube data with respect to the SM case within the region of parameter space that is otherwise consistent with various low-energy flavor physics measurements and the latest LHC input. Our study offers an up-to-date analysis for these two leptoquarks in view of the latest experimental data.

   hep-phEPJC(2020)·18 citations
9. 09*

   Chromopolarizabilities of bottomonia from the ${\rm Y}(2S,3S,4S)\to {\rm Y}(1S,2S)\pi \pi$ transitions

   Yun-Hua Chen🇨🇳 · Feng-Kun Guo🇨🇳

   The dipion transitions ${\rm Y}(2S,3S,4S)\to {\rm Y}(1S,2S)\pi \pi$ are systematically studied by considering the mechanisms of the hadronization of soft gluons, exchanging the bottomoniumlike $Z_b$ states, and the bottom-meson loops. The strong pion-pion final-state interaction, especially including the channel coupling to $K\bar{K}$ in the $S$-wave, is taken into account in a model-independent way using the dispersion theory. Through fitting to the available experimental data, we extract values of the transition chromopolarizabilities $|{\alpha }_{{\rm Y}(mS){\rm Y}(nS)}|$, which measure the chromoelectric couplings of the bottomonia with soft gluons. It is found that the $Z_b$ exchange has a slight impact on the extracted chromopolarizablity values, and the obtained $|{\alpha }_{{\rm Y}(2S){\rm Y}(1S)}|$ considering the $Z_b$ exchange is $(0.29\pm 0.20){\text{GeV}}^{-3}$. Our results could be useful in studying the interactions of bottomonium with light hadrons.

   hep-phhep-exhep-latnucl-thPRD(2019)·12 citations
10. 10*

    A comparative study between ESSnuSB and T2HK in determining the leptonic CP phase

    Monojit Ghosh🇸🇪 · Tommy Ohlsson🇸🇪

    In this paper, we perform a comparative analysis between the future proposed long-baseline experiments ESSnuSB and T2HK in measuring the leptonic CP phase ${\delta }_{\mathrm{CP}}$. In particular, we study the effect of the neutrino mass ordering degeneracy and the leptonic mixing angle ${\theta }_{23}$ octant degeneracy in the measurement of leptonic CP violation and precision for both experiments. Since the ESSnuSB (T2HK) experiment probes the second (first) oscillation maximum to study neutrino oscillations, the effect of these degeneracies are significantly different in both experiments. Our main conclusion is that for the ESSnuSB experiment, the information on the neutrino mass ordering does not play a major role in the determination of ${\delta }_{\mathrm{CP}}$, which is not the case for the T2HK experiment. However, the information on the true octant compromises the CP sensitivity of the ESSnuSB experiment as compared to T2HK if ${\theta }_{23}$ lies in the lower octant. These conclusions are true for both the 540~km and 360~km baseline options for the ESSnuSB experiment. In addition, we investigate the effect of different running times in neutrino and antineutrino modes and the effect of ${\theta }_{23}$ precision in measuring ${\delta }_{\mathrm{CP}}$.

    hep-phMod.Phys.Lett.A(2020)·20 citations
11. 11*

    An Axion-Like Particle from an $SO(10)$ Seesaw with $U(1{)}_X$

    Claudio Corianò🇮🇹 · Paul H. Frampton🇮🇹 · Alessandro Tatullo🇮🇹 · Dimosthenis Theofilopoulos🇮🇹

    We investigate the decoupling of heavy right handed neutrinos in the context of an SO(10) GUT model, where a remnant anomalous symmetry is $U(1{)}_X$. In this model the see-saw mechanism which generates the neutrino masses is intertwined with the Stueckelberg mechanism, which leaves the CP-odd phase of a very heavy Higgs in the low energy spectrum as an axion-like particle. Such pseudoscalar is predicted to be ultralight, in the $10^{-20}$ eV mass range. In this scenario, the remnant anomalous $X$ symmetry of the particles of the Standard Model is interpreted as due to the incomplete decoupling of the right handed neutrino sector. We illustrate this scenario including its realisation in the context of SO(10).

    hep-phPLB(2020)·3 citations
12. 12*

    Three loop heavy quark form factors and their asymptotic behavior

    J. Ablinger🇦🇹 · J. Blümlein🇩🇪 · P. Marquard🇩🇪 · N. Rana🇩🇪 · C. Schneider🇦🇹

    A summary of the calculation of the color-planar and complete light quark contributions to the massive three-loop form factors is presented. Here a novel calculation method for the Feynman integrals is used, solving general uni-variate first order factorizable systems of differential equations. We also present predictions for the asymptotic structure of these form factors.

    hep-phhep-thmath-phmath.MPSpringer Proc.Phys.(2021)·0 citations
13. 13*

    Precise prediction for the Higgs-Boson Masses in the $\mu \nu$SSM with three right-handed neutrino superfields

    Thomas Biekötter🇪🇸 · Sven Heinemeyer🇪🇸 · Carlos Muñoz🇪🇸

    The $\mu \nu$SSM is a simple supersymmetric extension of the Standard Model (SM) capable of describing neutrino physics in agreement with experiments. We perform the complete one-loop renormalization of the neutral scalar sector of the $\mu \nu$SSM with three generation of right-handed neutrinos in a mixed on-shell/$\overline{\mathrm{DR}}$ scheme. We calculate the full one-loop corrections to the neutral scalar masses of the $\mu \nu$SSM. The one-loop contributions are supplemented by available MSSM higher-order corrections. We obtain numerical results for a SM-like Higgs-boson mass consistent with experimental bounds, while simultaneously agreeing with neutrino oscillation data. We illustrate the distinct phenomenology of the $\mu \nu$SSM in scenarios in which one or more right-handed sneutrinos are lighter than the SM-like Higgs boson, which might be substantially mixed with them. These scenarios are experimentally accessible, on the one hand, through direct searches of the right-handed sneutrinos decaying into SM particles, and on the other hand, via the measurements of the SM-like Higgs-boson mass and its couplings. In this way the parameter space of the $\mu \nu$SSM can be probed without the need to propose model dependent searches at colliders. Finally, we demonstrate how the $\mu \nu$SSM can simultaneously accommodate two excesses measured at LEP and LHC at $\sim 96$ GeV at the $1\sigma$ level, while at the same time reproducing neutrino masses and mixings in agreement with neutrino oscillation measurements.

    hep-phEPJC(2019)·58 citations
14. 14*

    Polarization of tau in quasielastic (anti)neutrino scattering: the role of spectral functions

    J.E. Sobczyk🇪🇸 · N. Rocco🇺🇸 · J.Nieves🇪🇸

    We present a study of the $\tau$ polarization in charged-current quasielastic (anti)neutrino-nucleus scattering. The spectral function formalism is used to compute the differential cross section and the polarization components for several kinematical setups, relevant for neutrino-oscillation experiments. The effects of the nuclear corrections in these observables are investigated by comparing the results obtained using two different realistic spectral functions, with those deduced from the relativistic global Fermi gas model, where only statistical correlations are accounted for. We show that the spectral functions, although they play an important role when predicting the differential cross sections, produce much less visible effects on the polarization components of the outgoing $\tau$.

    ↳ nucl-thhep-phPRC(2019)·23 citations
15. 15*

    Paleo-Detectors for Galactic Supernova Neutrinos

    Sebastian Baum🇸🇪 · Thomas D. P. Edwards🇳🇱 · Bradley J. Kavanagh🇳🇱 · Patrick Stengel🇸🇪 · Andrzej K. Drukier🇸🇪 · Katherine Freese🇸🇪 · Maciej Górski🇵🇱 · Christoph Weniger🇳🇱

    Paleo-detectors are a proposed experimental technique in which one would search for traces of recoiling nuclei in ancient minerals. Natural minerals on Earth are as old as $\mathcal{O}(1)$Gyr and, in many minerals, the damage tracks left by recoiling nuclei are also preserved for timescales long compared to 1 Gyr once created. Thus, even reading out relatively small target samples of order 100 g, paleo-detectors would allow one to search for very rare events thanks to the large exposure, $\epsilon \sim 100\mathrm{g}\mathrm{Gyr}=10^5\mathrm{t}\mathrm{yr}$. Here, we explore the potential of paleo-detectors to measure nuclear recoils induced by neutrinos from galactic core collapse supernovae. We find that they would not only allow for a direct measurement of the average core collapse supernova rate in the Milky Way, but would also contain information about the time-dependence of the local supernova rate over the past $\sim$1 Gyr. Since the supernova rate is thought to be directly proportional to the star formation rate, such a measurement would provide a determination of the local star formation history. We investigate the sensitivity of paleo-detectors to both a smooth time evolution and an enhancement of the core collapse supernova rate on relatively short timescales, as would be expected for a starburst period in the local group.

    ↳ astro-ph.GAastro-ph.COhep-phPRD(2020)·40 citations
16. 16*

    Spiraling String in Gauss-Bonnet Geometry

    Mahdi Atashi🇮🇷 · Kazem Bitaghsir Fadafan🇮🇷

    In this paper, we consider a spiraling string falling in the bulk with Gauss$-$Bonnet geometry that is holographically dual to a heavy particle rotating through a hot plasma at finite coupling. One finds such interesting simple problem provides a novel perspective on different channels of the energy loss in the corresponding strongly coupled theory. Depends on the sign of the coupling, one observes that the influence of finite coupling on total energy loss and contribution of drag force and radiation channels appears as a shift on curves with respect to the plasma with infinite coupling. Also we found that crossover between regime in which drag force contribution is predominant to regime in which energy loss is due to radiation, does not depend on the Gauss$-$Bonnet coupling.

    ↳ hep-thhep-phPLB(2020)·12 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.