Fri·Mar 15, 2019Friday·March 15, 2019

1. 01*

   Quantum correlations in neutrino oscillations in curved spacetime

   Khushboo Dixit🇮🇳 · Javid Naikoo🇮🇳 · Banibrata Mukhopadhyay🇮🇳 · Subhashish Banerjee🇮🇳

   Gravity induced neutrino-antineutrino oscillations are studied in the context of one and two flavor scenarios. This allows one to investigate the particle-antiparticle correlations in two and four level systems, respectively. Flavor entropy is used to probe the entanglement in the system. The well known witnesses of non-classicality such as Mermin and Svetlichly inequalities are investigated. Since the extent of neutrino-antineutrino oscillation is governed by the strength of the gravitational field, the behavior of non-classicality shows interesting features as one varies the strength of the gravitational field. Specifically, the suppression of the entanglement with the increase of the gravitational field is observed which is witnessed in the form of decrease in the flavor entropy of the system. The features of the Mermin and the Svetlichny inequalities allow one to make statements about the degeneracy of neutrino mass eigenstates.

   hep-phgr-qcPRD(2019)·20 citations
2. 02*

   Minimal Yukawa deflection of AMSB from the Kahler potential

   Zhuang Li🇨🇳 · Fei Wang🇨🇳

   We propose a minimal Yukawa deflection scenario of AMSB from the Kahler potential through the Higgs-messenger mixing. Salient features of this scenario are discussed and realistic MSSM spectrum can be obtained. Such a scenario, which are very predictive, can solve the tachyonic slepton problem with less messenger species. Numerical results indicate that the LOSPs predicted by this scenario can not be good DM candidates. So it is desirable to extend this scenario with a Peccei-Quinn sector to solve the strong CP problem and at the same time provide new DM candidates. We propose a way to obtain a light axino mass in SUSY KSVZ axion model with Yukawa deflected anomaly mediation SUSY breaking mechanism. The axino can possibly be the LSP and act as a good DM candidate.

   hep-phJHEP(2019)·1 citation
3. 03*

   Supersymmetric $SU(5)\times U(1{)}_{\chi }$ and the Weak Gravity Conjecture

   Abhishek Pal🇺🇸 · Qaisar Shafi🇺🇸

   The gauge symmetry $SU(5)\times U(1{)}_{\chi }$ is the unique maximal subgroup of SO(10) which retains manifest unification at $M_{GUT}$ of the Standard Model gauge couplings, especially if low scale supersymmetry is present. The spontaneous breaking of $U(1{)}_{\chi }$ at some intermediate scale leaves unbroken a $Z_2$ symmetry which is precisely `matter' parity. This yields a stable supersymmetric dark matter particle as well as topologically stable cosmic strings. Motivated by the weak gravity conjecture we impose unification of $SU(5)$ and $U(1{)}_{\chi }$ at an ultraviolet cutoff $\Lambda \sim {\alpha }_{\Lambda }^{1/2}{M}_P\approx 5\times 10^{17}$ GeV, where ${\alpha }_{\Lambda }$ denotes the $SU(5)$ gauge coupling at $\Lambda$ and $M_P\approx 2.4\times 10^{18}$ GeV is the reduced Planck Scale. The impact of dimension five operators suppressed by $\Lambda$ on gauge coupling unification, proton lifetime estimates and $b-\tau$ Yukawa unification is discussed. In particular, the gauge boson mediated proton decay into $e^{+}{\pi }^0$ can lie within the $2-\sigma$ sensitivity of HyperKamiokande. We also discuss how the intermediate scale strings may survive inflation while the $SU(5)$ monopoles are inflated away. The unbroken $Z_2$ symmetry provides an intriguing link between dark matter, black holes carrying `quantum hair' and cosmic strings.

   hep-phPRD(2019)·8 citations
4. 04*

   Exploring twist-2 GPDs through quasi-distributions in a diquark spectator model

   Shohini Bhattacharya🇺🇸 · Christopher Cocuzza🇺🇸 · Andreas Metz🇺🇸

   Quasi parton distributions (quasi-PDFs) are currently under intense investigation. Quasi-PDFs are defined through spatial correlation functions and are thus accessible in lattice QCD. They gradually approach their corresponding standard (light-cone) PDFs as the hadron momentum increases. Recently, we investigated the concept of quasi-distributions in the case of generalized parton distributions (GPDs) by calculating the twist-2 vector GPDs in the scalar diquark spectator model. In the present work, we extend this study to the remaining six leading-twist GPDs. For large hadron momenta, all quasi-GPDs analytically reduce to the corresponding standard GPDs. We also study the numerical mismatch between quasi-GPDs and standard GPDs for finite hadron momenta. Furthermore, we present results for quasi-PDFs, and explore higher-twist effects associated with the parton momentum and the longitudinal momentum transfer to the target. We study the dependence of our results on the model parameters as well as the type of diquark. Finally, we discuss the lowest moments of quasi distributions, and elaborate on the relation between quasi-GPDs and the total angular momentum of quarks. The moment analysis suggests a preferred definition of several quasi-distributions.

   hep-phPRD(2020)·54 citations
5. 05*

   Extraction of Generalized Parton Distribution Observables from Deeply Virtual Electron Proton Scattering Experiments

   Brandon Kriesten🇺🇸 · Simonetta Liuti🇺🇸 · Liliet Calero-Diaz🇮🇹 · Dustin Keller🇺🇸 · Andrew Meyer🇺🇸 · Gary R. Goldstein🇺🇸 · J. Osvaldo Gonzalez-Hernandez🇮🇹

   We provide the general expression of the cross section for exclusive deeply virtual photon electroproduction from a spin 1/2 target using current parameterizations of the off-forward correlation function in a nucleon for different beam and target polarization configurations up to twist three accuracy. All contributions to the cross section including deeply virtual Compton scattering, the Bethe-Heitler process, and their interference, are described within a helicity amplitude based framework which is also relativistically covariant and readily applicable to both the laboratory frame and in a collider kinematic setting. Our formalism renders a clear physical interpretation of the various components of the cross section by making a connection with the known characteristic structure of the electron scattering coincidence reactions. In particular, we focus on the total angular momentum, $J_z$, and on the orbital angular momentum, $L_z$. On one side, we uncover an avenue to a precise extraction of $J_z$, given by the combination of generalized parton distributions, $H+E$, through a generalization of the Rosenbluth separation method used in elastic electron proton scattering. On the other, we single out for the first time, the twist three angular modulations of the cross section that are sensitive to $L_z$. The proposed generalized Rosenbluth technique adds an important constraint for mapping the 3D structure of the nucleon.

   hep-phPRD(2020)·55 citations
6. 06*

   Timing information at HL-LHC: Complete determination of masses of Dark Matter and Long lived particle

   Zachary Flowers🇺🇸 · Dong Woo Kang🇰🇷 · Quinn Meier🇺🇸 · Seong Chan Park🇰🇷 · Christopher Rogan🇺🇸

   A long standing problem in kinematics at the hadron colliders is to determine the mass of invisible particles. This issue is particularly important for the signals of dark matter, which becomes one of the prominent targets of future collider experiments. In this paper, we show that the additional information from the precise timing measurement, which will be available at the planned high-liminosity run of the LHC (HL-LHC), will shade new light on the kinematics study. As a concrete example, we focus on the signal of the pair produced long-lived particles ($LL{P}_{1,2}$), respectively leaving displaced vertex with visible ($V_{1,2}$) and invisible ($I_{1,2}$) final state, $pp\to LL{P}_1+LL{P}_2\to (V_1+I_1)+(V_2+I_2)$. We explicitly show that this system is completely solvable with timing information.

   hep-phJHEP(2020)·16 citations
7. 07*

   Semileptonic decays of the scalar tetraquark $Z_{bc;\overline{u}\overline{d}}^0$

   H. Sundu🇹🇷 · S. S. Agaev🇦🇿 · K. Azizi🇹🇷

   We study semileptonic decays of the scalar tetraquark $Z_{bc;\overline{u}\overline{d}}^0$ to final states $T_{bs;\overline{u}\overline{d}}^{-}{e}^{+}{\nu }_e$ and $T_{bs;\overline{u}\overline{d}}^{-}{\mu }^{+}{\nu }_{\mu }$ , which run through the weak transitions $c\to s{e}^{+}{\nu }_e$ and $c\to s{\mu }^{+}{\nu }_{\mu }$, respectively. To this end, we calculate the mass and coupling of the final-state scalar tetraquark $T_{bs;\overline{u}\overline{d}}^{-}$ by means of the QCD two-point sum rule method: these spectroscopic parameters are used in our following investigations. In calculations we take into account the vacuum expectation values of the quark, gluon, and mixed operators up to dimension ten. We use also three-point sum rules to evaluate the weak form factors $G_i(q^2)$ ($i=1,2$) that describe these decays. The sum rule predictions for $G_i(q^2)$ are employed to construct fit functions $F_i(q^2)$, which allow us to extrapolate the form factors to the whole region of kinematically accessible $q^2$. These functions are required to get partial widths of the semileptonic decays $\Gamma \left(Z_{bc}^0\to T{e}^{+}{\nu }_e\right)$ and $\Gamma \left(Z_{bc}^0\to T{\mu }^{+}{\nu }_{\mu }\right)$ by integrating corresponding differential rates. We analyze also the two-body nonleptonic decays $Z_{bc;\overline{u}\overline{d}}^0\to T_{bs;\overline{u}\overline{d}}^{-}{\pi }^{+}$ and $Z_{bc;\overline{u}\overline{d}}^0\to T_{bs;\overline{u}\overline{d}}^{-}{K}^{+}$, which are necessary to evaluate the full width of the $Z_{bc;\overline{u}\overline{d}}^0$. The obtained results for ${\Gamma }_{\mathrm{full}}=(3.18\pm 0.39)\times 10^{-11}\mathrm{MeV}$ and mean lifetime $20.7_{-2.3}^{+2.9}\mathrm{ps}$ of the tetraquark $Z_{bc;\overline{u}\overline{d}}^0$ can be used in experimental investigations of this exotic state.

   hep-phhep-exhep-latEPJC(2019)·20 citations
8. 08*

   Muon anomalous magnetic moment, Z boson decays, and collider physics in multi-charged particles

   Takaaki Nomura🇰🇷 · Hiroshi Okada🇰🇷

   We analyze allowed region of muon anomalous magnetic moment (muon $g-2$), satisfying lepton flavor violations, $Z$ boson decays, and collider physics, in a framework of multi-charged particles. Then we explore the typical size of the muon $g-2$, and discuss which modes dominantly affect muon $g-2$.

   hep-phPRD(2020)·13 citations
9. 09*

   Weak Decays of Stable Open-bottom Tetraquark by SU(3) Symmetry Analysis

   Ye Xing🇨🇳 · Fu-Sheng Yu🇨🇳 · Ruilin Zhu🇨🇳

   The exotic state $X(5568)$ which was observed by D0 Collaboration is very likely to be a tetraquark state with four different valence quark flavors, though the existence was not confirmed by other collaborations. The possibility of such state still generate lots of interests in theory. In the paper, we will study the properties of the state under the SU(3) flavor symmetry. This four quark state with a heavy bottom quark and three light quarks(anti-quark) can form a $6$ or $\overline{15}$ representation. The weak decays can be dominant and should be discussed carefully while such state is stable against the strong interaction. Therefor we will study the multi-body semileptonic and nonleptonic weak decays systematically. With the help of SU(3) flavor symmetry, we can give the Hamiltonian in the hadronic level, then obtain the parameterized irreducible amplitudes and the relations of different channels. At the end of the article, we collect some Cabibbo allowed two-body and three-body weak decay channels which can be used to reconstruct $X_{b6}$ states at the branching fraction up to be $10^{-5}$.

   hep-phEPJC(2019)·17 citations
10. 10*

    Photon induced processes in semi-central nucleus-nucleus collisions

    Antoni Szczurek🇵🇱

    We calculate total and differential cross sections for $J/\psi$ photoproduction in ultrarelativistic lead-lead collisions at the LHC energy $\sqrt{s_{NN}}=2.76$ TeV. We use a simple model based on vector dominance picture and multiple scattering of the hadronic ($c\bar{c}$) state in a cold nucleus. In our analysis we use Glauber formulae for calculating ${\sigma }_{tot,J/\psi Pb}$ which is a building block of our model. For semi-central collisions a modification of the photon flux is necessary. We discuss how to effectively correct photon fluxes for geometry effects. We try to estimate the cross sections for different centrality bins and for $J/\psi$ mesons emitted in forward rapidity range ($2.5<y<4$) corresponding to the ALICE experimental results. We discuss similar analysis for dilepton production in ultrarelativistic heavy-ion collisions at very low pair transverse momenta, $P_T\le 0.15$\,GeV. We investigate the interplay of thermal radiation with photon annihilation processes, $\gamma \gamma \to l^{+}{l}^{-}$, due to the coherent electromagnetic fields of the colliding nuclei. For the thermal radiation, we employ the emission from the QGP and hadronic phases with in-medium vector spectral functions. We first verify that the combination of photon fusion, thermal radiation and final-state hadron decays gives a fair description of the low-$P_T$ invariant-mass as well as $P_T$ distributions as measured recently by the STAR collaboration in $\sqrt{s_{NN}}$=200\,GeV Au+Au collisions for different centralities. The coherent contribution dominates in peripheral collisions, while thermal radiation shows a significantly stronger increase with centrality. We also provide predictions for the ALICE experiment at the LHC. The resulting excitation function reveals a nontrivial interplay of photoproduction and thermal radiation.

    hep-phnucl-thActa Phys.Polon.B(2019)·0 citations
11. 11*

    Discovery potential of multi-ton xenon detectors in neutrino electromagnetic properties

    Chung-Chun Hsieh🇹🇼 · Lakhwinder Singh🇹🇼 · Chih-Pan Wu🇹🇼 · Jiunn-Wei Chen🇹🇼 · Hsin-Chang Chi🇹🇼 · C.-P. Liu🇹🇼 · Mukesh K. Pandey🇹🇼 · Henry T. Wong🇹🇼

    Next-generation xenon detectors with multi-ton-year exposure are powerful direct probes of dark matter candidates, in particular the favorite weakly-interacting massive particles. Coupled with the features of low thresholds and backgrounds, they are also excellent telescopes of solar neutrinos. In this paper, we study the discovery potential of ton-scale xenon detectors in electromagnetic moments of solar neutrinos. Relevant neutrino-atom scattering processes are calculated by applying a state-of-the-arts atomic many-body method--relativistic random phase approximation (RRPA). Limits on these moments are derived from existing data and estimated with future experiment specifications. With one ton-year exposure, XENON-1T can improve the effective milli-charge constraint by a factor two. With LZ and DARWIN, the projected improvement on the solar neutrino effective milli-charge(magnetic moment) is around 7(2) times smaller than the current bound. If LZ can keep the same background level and push the electron recoil threshold to 0.5 keV, the projected improvement on milli-charge(magnetic moment) is about 10(3) times smaller than the current bound.

    hep-phhep-exnucl-exnucl-thPRD(2019)·35 citations
12. 12*

    Disentangling genuine from matter-induced CP violation in neutrino oscillations

    Alejandro Segarra🇪🇸 · Jose Bernabeu🇪🇸

    We prove that, in any flavor transition, neutrino oscillation CP violating asymmetries in matter have two disentangled components: (a) a CPT-odd T-invariant term, non-vanishing iff there are interactions with matter; (b) a T-odd CPT-invariant term, non-vanishing iff there is genuine CP violation. As function of the baseline, these two terms are distinct L-even and L-odd observables, respectively. In the experimental region of terrestrial accelerator neutrinos, we calculate their approximate expressions from which we prove that, at medium baselines, the CPT-odd component is small and nearly $\delta$-independent, so it can be subtracted from the experimental CP asymmetry as a theoretical background, provided the hierarchy is known. At long baselines, on the other hand, we find that (i) a Hierarchy-odd term in the CPT-odd component dominates the CP asymmetry for energies above the first oscillation node, and (ii) the CPT-odd term vanishes, independent of the CP phase $\delta$, at E = 0.92 GeV(L/1300 km) near the second oscillation maximum, where the T-odd term is almost maximal and proportional to $\sin \delta$. A measurement of the CP asymmetry in these energy regions would thus provide separate information on (i) the neutrino mass ordering, and (ii) direct evidence of genuine CP violation in the lepton sector.

    hep-phJ.Phys.Conf.Ser.(2020)·0 citations
13. 13*

    Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC

    Marco Drewes🇧🇪 · Jan Hajer🇧🇪

    We study the sensitivity of displaced vertex searches for heavy neutrinos produced in W boson decays in the LHC detectors ATLAS, CMS and LHCb. We also propose a new search that uses the muon chambers to detect muons from heavy neutrino decays outside the tracker. The sensitivity estimates are based on benchmark models in which the heavy neutrinos mix exclusively with one of the three Standard Model generations. In the most sensitive mass regime the displaced vertex searches can improve existing constraints on the mixing with the first two Standard Model generations by more than four orders of magnitude and by three orders of magnitude for the mixing with the third generation.

    hep-phhep-exJHEP(2020)·137 citations
14. 14*

    Softened Goldstone-Symmetry Breaking

    Simone Blasi🇩🇪 · Florian Goertz🇩🇪

    We propose a new way of breaking the Goldstone symmetry in composite Higgs models, restoring the global symmetry in the mixings between the elementary and composite fermions by completing the former to full representations of this symmetry. The Goldstone symmetry is in turn broken softly by vector-like mass terms in the {\it elementary} sector only. The resulting softened explicit breaking allows for a light Higgs boson, as found at the LHC, and a heavy top quark, without the need of light top partners around the Goldstone scale $f\sim \mathrm{TeV}\ll m_{comp.}$, which remain elusive at the LHC, while we recover the standard scenario in the limit of infinite vector-like masses.

    hep-phPRL(2019)·24 citations
15. 15*

    The unpolarized two-loop massive pure singlet Wilson coefficients for deep-inelastic scattering

    J. Blümlein🇩🇪 · A. De Freitas🇩🇪 · C.G. Raab🇦🇹 · K. Schönwald🇩🇪

    We calculate the massive two--loop pure singlet Wilson coefficients for heavy quark production in the unpolarized case analytically in the whole kinematic region and derive the threshold and asymptotic expansions. We also recalculate the corresponding massless two--loop Wilson coefficients. The complete expressions contain iterated integrals with elliptic letters. The contributing alphabets enlarge the Kummer-Poincaré letters by a series of square-root valued letters. A new class of iterated integrals, the Kummer-elliptic integrals, are introduced. For the structure functions $F_2$ and $F_L$ we also derive improved asymptotic representations adding power corrections. Numerical results are presented.

    hep-phhep-exhep-thNPB(2019)·28 citations
16. 16*

    Cool baryon and quark matter in holographic QCD

    Takaaki Ishii🇯🇵 · Matti Järvinen🇳🇱 · Govert Nijs🇳🇱

    We establish a holographic bottom-up model which covers both the baryonic and quark matter phases in cold and dense QCD. This is obtained by including the baryons using simple approximation schemes in the V-QCD model, which also includes the backreaction of the quark matter to the dynamics of pure Yang-Mills. We examine two approaches for homogeneous baryon matter: baryons as a thin layer of noninteracting matter in the holographic bulk, and baryons with a homogeneous bulk gauge field. We find that the second approach exhibits phenomenologically reasonable features. At zero temperature, the vacuum, baryon, and quark matter phases are separated by strongly first order transitions as the chemical potential varies. The equation of state in the baryonic phase is found to be stiff, i.e., the speed of sound clearly exceeds the value $c_s^2=1/3$ of conformal plasmas at high baryon densities.

    hep-phhep-thnucl-thJHEP(2019)·90 citations
17. 17*

    A complete set of in-medium splitting functions to any order in opacity

    Matthew D. Sievert🇺🇸 · Ivan Vitev🇺🇸 · Boram Yoon🇺🇸

    In this Letter we report the first calculation of all $\mathcal{O}({\alpha }_s)$ medium-induced branching processes to any order in opacity. Our splitting functions results are presented as iterative solutions to matrix equations with initial conditions set by the leading order branchings in the vacuum. The flavor and quark mass dependence of the in-medium $q\to qg$, $g\to gg$, $q\to gq$, $g\to q\bar{q}$ processes is fully captured by the light-front wavefunction formalism and the color representation of the parent and daughter partons. We include the explicit solutions to second order in opacity as supplementary material and present numerical results in a realistic strongly-interacting medium produced in high center-of-mass energy heavy ion collisions at the Large Hadron Collider. Our numerical simulations show that the second order in opacity corrections can change the energy dependence of the in-medium shower intensity. We further find corrections to the longitudinal and angular distributions of the in-medium splitting kernels that may have important implications for jet substructure phenomenology.

    hep-phnucl-thPLB(2019)·74 citations
18. 18*

    Planar master integrals for four-loop form factors

    Andreas von Manteuffel🇺🇸 · Robert M. Schabinger🇺🇸

    We present the complete set of planar master integrals relevant to the calculation of three-point functions in four-loop massless Quantum Chromodynamics. Employing direct parametric integrations for a basis of finite integrals, we give analytic results for the Laurent expansion of conventional integrals in the parameter of dimensional regularization through to terms of weight eight.

    hep-phhep-thJHEP(2019)·24 citations
19. 19*

    All the Fun of the FAIR: Fundamental physics at the Facility for Antiproton and Ion Research

    M. Durante🇮🇹 · P. Indelicato🇫🇷 · B. Jonson🇸🇪 · V. Koch🇺🇸 · K. Langanke🇩🇪 · Ulf-G. Meißner🇩🇪 · E. Nappi🇮🇹 · T. Nilsson🇸🇪 · Th. Stöhlker🇩🇪 · E. Widmann🇦🇹 · M. Wiescher🇺🇸

    The Facility for Antiproton and Ion Research (FAIR) will be the accelerator-based flagship research facility in many basic sciences and their applications in Europe for the coming decades. FAIR will open up unprecedented research opportunities in hadron and nuclear physics, in atomic physics and nuclear astrophysics as well as in applied sciences like materials research, plasma physics and radiation biophysics with applications towards novel medical treatments and space science. FAIR is currently under construction as an international facility at the campus of the GSI Helmholtzzentrum for Heavy-Ion Research in Darmstadt, Germany. While the full science potential of FAIR can only be harvested once the new suite of accelerators and storage rings is completed and operational, some of the experimental detectors and instrumentation are already available and will be used starting in summer 2018 in a dedicated research program at GSI, exploiting also the significantly upgraded GSI accelerator chain. The current manuscript summarizes how FAIR will advance our knowledge in various research fields ranging from a deeper understanding of the fundamental interactions and symmetries in Nature to a better understanding of the evolution of the Universe and the objects within.

    ↳ nucl-thhep-exhep-phnucl-ex+1Phys.Scripta(2019)·111 citations
20. 20*

    Topological String Geometry

    Matsuo Sato🇯🇵 · Yuji Sugimoto🇯🇵

    Perturbative string amplitudes are correctly derived from the string geometry theory, which is one of the candidates of a non-perturbative formulation of string theory. In order to derive non-perturbative effects rather easily, we formulate topological string geometry theory. We derive the perturbative partition function of the topological string theory from fluctuations around a classical solution in the topological string geometry theory.

    ↳ hep-thhep-phmath.AGmath.DG+1NPB(2020)·14 citations
21. 21*

    Prospective constraints on the primordial black hole abundance from the stochastic gravitational-wave backgrounds produced by coalescing events and curvature perturbations

    Sai Wang🇯🇵 · Takahiro Terada🇯🇵 · Kazunori Kohri🇯🇵

    For a variety of on-going and planned gravitational-wave (GW) experiments, we study expected constraints on the fraction ($f_{\mathrm{PBH}}$) of primordial black holes (PBHs) in dark matter by evaluating the energy-density spectra of two kinds of stochastic GW backgrounds. The first one is produced from an incoherent superposition of GWs emitted from coalescences of all the binary PBHs. The second one is induced through non-linear mode couplings of large primordial curvature perturbations inevitably associated with the generation of PBHs in the early Universe. In this paper, we focus on the PBHs with their masses of $10^{-8}{M}_{\odot }\le M_{\mathrm{PBH}}<1M_{\odot }$, since they are not expected to be of a stellar origin. In almost all ranges of the masses, we show that the experiments are sensitive to constrain the fraction for $10^{-5}\lesssim f_{\mathrm{PBH}}\lesssim 1$ by considering the GWs from coalescing events and $10^{-13}\lesssim f_{\mathrm{PBH}}\lesssim 1$ by considering the GWs from curvature perturbations. Exceptionally, only in a narrow range of masses for $M_{\mathrm{PBH}}\simeq 10^{-7}{M}_{\odot }$, the fraction cannot be constrained for $f_{\mathrm{PBH}}\lesssim 10^{-13}$ by those two GW backgrounds.

    ↳ astro-ph.COgr-qchep-phPRD(2019)·200 citations
22. 22*

    Interplay between the holographic QCD phase diagram and mutual & $n$-partite information

    Subhash Mahapatra🇮🇳

    In earlier work, we studied holographic entanglement entropy in QCD phases using a dynamical Einstein-Maxwell-dilaton gravity model whose dual boundary theory mimics essential features of QCD above and below deconfinement. The model although displays subtle differences compared to the standard QCD phases, however, it introduces a notion of temperature in the phase below the deconfinement critical temperature and captures quite well the entanglement and thermodynamic properties of QCD phases. Here we extend our analysis to study the mutual and $n$-partite information by considering $n$ strips with equal lengths and equal separations, and investigate how these quantities leave their imprints in holographic QCD phases. We discover a rich phase diagram with $n\ge 2$ strips and the corresponding mutual and $n$-partite information shows rich structure, consistent with the thermodynamical transitions, while again revealing some subtleties. Below the deconfinement critical temperature, we find no dependence of the mutual and $n$-partite information on temperature and chemical potential.

    ↳ hep-thgr-qchep-phquant-phJHEP(2019)·39 citations
23. 23*

    Hadron transverse momentum distributions of the Tsallis normalized and unnormalized statistics

    A.S. Parvan🇷🇺 · T. Bhattacharyya🇷🇺

    The exact analytical formulas for the transverse momentum distributions of the Bose-Einstein, Fermi-Dirac and Maxwell-Boltzmann statistics of particles with nonzero mass in the framework of the Tsallis normalized and Tsallis unnormalized (also known as Tsallis-1 and Tsallis-2) statistics have been consistently derived. The final exact results were expressed in terms of the series expansions in the integral representation. The zeroth term approximation to both quantum and classical statistics of particles has been introduced. We have revealed that the phenomenological classical Tsallis distribution (widely used in high energy physics) is equal to the distribution of the Tsallis unnormalized statistics in the zeroth term approximation, but the phenomenological quantum Tsallis distributions (introduced by definition on the basis of the generalized entropy of the ideal gas) do not correspond to the distributions of the Tsallis statistics. We have found that in the ranges of the entropic parameter relevant to the processes of high-energy physics ($q<1$ for Tsallis-1 and $q>1$ for Tsallis-2) the Tsallis statistics is divergent. Therefore, to obtain physical results, we have regularized the Tsallis statistics by introducing an upper cut-off in the series expansion. The exact numerical results for the Bose-Einstein, Fermi-Dirac and Maxwell-Boltzmann statistics of particles in the Tsallis normalized and unnormalized statistics have been obtained. We observed that the exact results of the Tsallis statistics strongly enhanced the production of high-$p_T$ hadrons in comparison with the usual phenomenological Tsallis distribution function at the same values of $q$. The $q$-duality of the Tsallis normalized and unnormalized statistics for the massive particles was studied.

    ↳ nucl-thhep-phEPJA(2020)·23 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.