Mon·Feb 24, 2020Monday·February 24, 2020

1. 01*

   Scheme-Independent Series for Anomalous Dimensions of Higher-Spin Operators at an Infrared Fixed Point in a Gauge Theory

   Thomas A. Ryttov🇩🇰 · Robert Shrock🇺🇸

   We consider an asymptotically free vectorial gauge theory, with gauge group $G$ and $N_f$ fermions in a representation $R$ of $G$, having an infrared fixed point of the renormalization group. We calculate scheme-independent series expansions for the anomalous dimensions of higher-spin bilinear fermion operators at this infrared fixed point up to $O({\Delta }_f^3)$, where ${\Delta }_f$ is an $N_f$-dependent expansion variable. Our general results are evaluated for several special cases, including the case $G=\mathrm{SU}(N_c)$ with $R$ equal to the fundamental and adjoint representations.

   hep-phhep-lathep-thPRD(2020)·10 citations
2. 02*

   Constraining electroweak penguin graph contributions in measurements of the CKM phase alpha using $B\to \pi \pi$ and $B\to \rho \rho$ decays

   Abinash Kumar Nayak🇮🇳 · Rahul Sinha🇮🇳 · Anirban Karan🇮🇳 · Benjamin Grinstein🇺🇸

   The unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix has been well established by both direct and indirect measurements without any evidence of discrepancy. The CKM weak phase $\alpha$ is directly measured using an isospin analysis in $B\to \pi \pi$ and $B\to \rho \rho$ assuming that electroweak penguin contributions are ignorable. However, electroweak penguins are sensitive to NP, hence, it is important to experimentally estimate their effects. We determine the size of both electroweak penguin and isospin amplitudes, directly from $B\to \pi \pi$ and $B\to \rho \rho$ experimental data, using in addition the indirectly measured value of $\alpha$. We find that electroweak penguin contribution are indeed small and agree with SM expectations within $1\sigma$. We also find that there is a mild enhancement of the $\Delta I=\frac{1}{2}$ transition amplitude.

   hep-phPRD(2020)·2 citations
3. 03*

   Resonant instability of axionic dark matter clumps

   Z. Wang🇨🇳 · L. Shao🇨🇳 · L.-X. Li🇨🇳

   Axion is a popular candidate for dark matter particles. Axionic dark matter may form Bose-Einstein condensate and may be gravitationally bound to form axion clumps. Under the presence of electromagnetic waves with frequency $\omega =m_a/2$, where $m_a$ is the axion mass, a resonant enhancement may occur, causing an instability of the axion clumps. With analytical and numerical approaches, we study the resonant instability of axionic dark matter clumps with infinite homogeneous mass distribution, as well as distribution with a finite boundary. After taking realistic astrophysical environments into consideration, including gravitational redshift and plasma effects, we obtain an instability region in the axion density-clump size parameter space with given mass and coupling of axions. In particular, we show that, for axion clumps formed by the QCD axions in equilibrium, no resonant instability will occur.

   hep-phastro-ph.COJCAP(2020)·23 citations
4. 04*

   Interplay between $\mu$-$\tau$ reflection symmetry, four-zero texture and universal texture

   Masaki J. S. Yang🇯🇵

   In this letter, we consider exact $\mu -\tau$ reflection symmetries for quarks and leptons. Fermion mass matrices are assumed to be four-zero textures for charged fermions $f=u,d,e$ and a symmetric matrix for neutrinos ${\nu }_L$. By a bi-maximal transformation, all the mass matrices lead to $\mu -\tau$ reflection symmetric forms, which seperately satisfy $T_u{m}_{u,\nu }^{\ast }{T}_u=m_{u,\nu }$ and $T_d{m}_{d,e}^{\ast }{T}_d=m_{d,e}$. Reconciliation between the $\mu -\tau$ reflection symmetries and observed $\sin {\theta }_{13}$ predicts ${\delta }_{CP}\simeq 203^{\circ }$. Moreover, imposition of universal texture $(m_f{)}_{11}=0$ for $f=u,d,\nu ,e$ predicts the normal hierarchy with the lightest neutrino mass $|m_1|=6.26$ or $2.54$ meV.

   hep-phPLB(2020)·24 citations
5. 05*

   Jet substructure modification probes the QGP resolution length

   Jorge Casalderrey-Solana🇪🇸 · Guilherme Milhano🇵🇹 · Daniel Pablos🇳🇴 · Krishna Rajagopal🇺🇸

   We show the sensitivity of groomed jet substructure measurements to the finite resolution power of the QGP to disentangle multiple energetic partons, as produced by QCD jets, that traverse it simultaneously. We illustrate these effects by studying Soft Dropped observables within a hybrid strong/weak coupling model for jet-medium interactions. By analysing Monte-Carlo-generated jet data in heavy ion collisions, we show that the angular structure of these type of observables is sensitive to the value of the QGP resolution length.

   hep-phNPA(2021)·7 citations
6. 06*

   Collinear Electroweak Radiation in Antenna Parton Showers

   Ronald Kleiss🇳🇱 · Rob Verheyen🇬🇧

   We present a first implementation of collinear electroweak radiation in the Vincia parton shower. Due to the chiral nature of the electroweak theory, explicit spin dependence in the shower algorithm is required. We thus use the spinor-helicity formalism to compute helicity-dependent branching kernels, taking special care to deal with the gauge relics that may appear in computation that involve longitudinal polarizations of the massive electroweak vector bosons. These kernels are used to construct a shower algorithm that includes all possible collinear final-state electroweak branchings, including those induced by the Yang-Mills triple vector boson coupling and all Higgs couplings, as well as vector boson emissions from the initial state. We incorporate a treatment of features particular to the electroweak theory, such as the effects of bosonic interference and recoiler effects, as well as a preliminary description of the overlap between electroweak branchings and resonance decays. Some qualifying results on electroweak branching spectra at high energies, as well as effects on LHC physics are presented. Possible future improvements are discussed, including treatment of soft and spin effects, as well as issues unique to the electroweak sector.

   hep-phEPJC(2020)·31 citations
7. 07*

   Baryon quadrupole moment in the 1/N(c) expansion of QCD

   Victor Miguel Banda Guzman🇲🇽 · Ruben Flores-Mendieta🇲🇽 · Johann Hernandez🇲🇽 · Felipe de Jesus Rosales-Aldape🇲🇽

   The quadrupole moments of ground state baryons are discussed in the framework of the 1/N(c) expansion of QCD, where N(c) is the number of color charges. Theoretical expressions are first provided assuming an exact SU(3) flavor symmetry, and then the effects of symmetry breaking are accounted for to linear order. The rather scarce experimental information available does not allow a detailed comparison between theory and experiment, so the free parameters in the approach are not determined. Instead, some useful new relations among quadrupole moments, valid even in the presence of first-order symmetry breaking, are provided. The overall predictions of the 1/N(c) expansion are quite enlightening.

   hep-phPRD(2020)·3 citations
8. 08*

   The effective potential and universality in GUT inspired gauge-Higgs unification

   Shuichiro Funatsu🇨🇳 · Hisaki Hatanaka🇯🇵 · Yutaka Hosotani🇯🇵 · Yuta Orikasa🇨🇿 · Naoki Yamatsu🇯🇵

   The effective potential for the Aharonov-Bohm phase ${\theta }_H$ in the fifth dimension in GUT inspired $SO(5)\times U(1)\times SU(3)$ gauge-Higgs unification is evaluated to show that dynamical electroweak symmetry breaking takes place with ${\theta }_H\ne 0$, the 4D Higgs boson mass 125GeV being generated at the quantum level. The cubic and quartic self-couplings $({\lambda }_3,{\lambda }_4)$ of the Higgs boson are found to satisfy universal relations, i.e. they are determined, to high accuracy, solely by ${\theta }_H$, irrespective of values of other parameters in the model. For ${\theta }_H=0.1$ ($0.15$), ${\lambda }_3$ and ${\lambda }_4$ are smaller than those in the standard model by 7.7% (8.1%) and 30% (32%), respectively.

   hep-phPRD(2020)·20 citations
9. 09*

   Testing Fundamental Physics in Antihydrogen Experiments

   M. Charlton🇬🇧 · S. Eriksson🇬🇧 · G. M. Shore🇬🇧

   The recent advent of high precision antihydrogen spectroscopy opens the way to stringent experimental tests of the fundamental principles underlying particle physics and general relativity (GR), such as Lorentz and CPT invariance and the Einstein Equivalence Principle (EEP), on pure antimatter systems. In this paper, the nature and implications of these tests is investigated, with special reference to the ALPHA antihydrogen programme at CERN. This is underpinned by a theoretical review of the role of antiparticles, causality and fundamental symmetries in relativistic quantum field theory (QFT) and the theory of time measurement in GR. Low-energy effective theories which break Lorentz and CPT symmetry, or the Strong Equivalence Principle (SEP), are then introduced, together with a review of several `fifth force' scenarios involving new long-range forces which would effectively violate the universality of free-fall, or Weak Equivalence Principle (WEPff). The possible role of CPT violation in determining the matter-antimatter asymmetry of the Universe is discussed. Explicit calculations are given for the dependence on possible Lorentz and CPT violating couplings of the transition frequencies amongst the 1S, 2S and 2P hyperfine states measured in the magnetic field of the ALPHA trap and the resulting bounds are compared with existing limits. An analysis of the implications for the EEP of current free-fall and spectroscopic measurements with antihydrogen is presented and existing and potential bounds on WEPff and the universality of clocks (WEPc) are derived, together with constraints on fifth forces. Future prospects for high-precision antihydrogen spectroscopy, free-fall and gravitational redshift experiments, and anti-atom matter-wave interferometry are described and experimental possibilities involving other antimatter species are briefly outlined.

   hep-phhep-thphysics.atom-ph19 citations
10. 10*

    General recipe to form input space for deep learning analysis of HEP scattering processes

    Andrei Chernoded🇷🇺 · Lev Dudko🇷🇺 · Georgi Vorotnikov🇷🇺 · Petr Volkov🇷🇺 · Dmitri Ovchinnikov🇷🇺 · Maxim Perfilov🇷🇺 · Artem Shporin🇷🇺

    Deep learning neural network technique (DNN) is one of the most efficient and general approach of multivariate data analysis of the collider experiments. The important step of the analysis is the optimization of the input space for multivariate technique. In the article we propose the general recipe how to form the set of low-level observables sensitive for the differences in hard scattering processes at the colliders. It is shown in the paper that without any sophisticated analysis of the kinematic properties one can achieve close to optimal performance of DNN with the proposed general set of low-level observables.

    hep-phphysics.data-anInt.J.Mod.Phys.A(2020)·7 citations
11. 11*

    Hadroproduction of scalar $P$-wave quarkonia in the light-front $k_T$-factorization approach

    Izabela Babiarz🇵🇱 · Roman Pasechnik🇸🇪 · Wolfgang Schäfer🇵🇱 · Antoni Szczurek🇵🇱

    In this work, we present a thorough analysis of scalar $P$-wave ${\chi }_{Q0}$, $Q=c,b$ quarkonia electromagnetic form factors for the ${\gamma }^{\ast }{\gamma }^{\ast }\to {\chi }_{Q0}$ couplings, as well as their hadroproduction observables in $k_{\perp }$-factorisation using the light-front potential approach for the quarkonium wave function. The electromagnetic form factors are presented as functions of photon virtualities. We discuss the role of the Melosh spin-rotation and relativistic corrections estimated by comparing our results with those in the standard nonrelativistic QCD (NRQCD) approach. Theoretical uncertainties of our approach are found by performing the analysis with two different unintegrated gluon densities and with five distinct models of the $Q\bar{Q}$ interaction potentials consistent with the meson spectra. The results for the rapidity and transverse momentum distributions of ${\chi }_{Q0}$ produced in high-energy $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$ are shown.

    hep-phJHEP(2020)·36 citations
12. 12*

    Quark structure of the ${\chi }_{\mathrm{c}}(3P)$ and $X(4274)$ resonances and their strong and radiative decays

    J. Ferretti🇫🇮 · E. Santopinto🇮🇹 · M. Naeem Anwar🇩🇪 · Yu Lu🇨🇳

    We calculate the masses of ${\chi }_{\mathrm{c}}(3P)$ states with threshold corrections in a coupled-channel model. The model was recently applied to the description of the properties of ${\chi }_{\mathrm{c}}(2P)$ and ${\chi }_{\mathrm{b}}(3P)$ multiplets [Phys.\ Lett.\ B {\bf 789}, 550 (2019)]. We also compute the open-charm strong decay widths of the ${\chi }_{\mathrm{c}}(3P)$ states and their radiative transitions. According to our predictions, the ${\chi }_{\mathrm{c}}(3P)$ states should be dominated by the charmonium core, but they may also show small meson-meson components. The $X(4274)$ is interpreted as a $c\bar{c}$ ${\chi }_{c1}(3P)$ state. More informations on the other members of the ${\chi }_{\mathrm{c}}(3P)$ multiplet, as well as a more rigorous analysis of the $X(4274)$'s decay modes, are needed to provide further indications on the quark structure of the previous resonance.

    hep-phEPJC(2020)·17 citations
13. 13*

    Likelihood-free inference of experimental Neutrino Oscillations using Neural Spline Flows

    Sebastian Pina-Otey🇪🇸 · Federico Sánchez🇨🇭 · Vicens Gaitan🇪🇸 · Thorsten Lux🇪🇸

    In machine learning, likelihood-free inference refers to the task of performing an analysis driven by data instead of an analytical expression. We discuss the application of Neural Spline Flows, a neural density estimation algorithm, to the likelihood-free inference problem of the measurement of neutrino oscillation parameters in Long Baseline neutrino experiments. A method adapted to physics parameter inference is developed and applied to the case of the disappearance muon neutrino analysis at the T2K experiment.

    hep-phcs.LGhep-exPRD(2020)·5 citations
14. 14*

    CP odd weak basis invariants in minimal see-saw model and Leptogenesis

    Madan Singh

    In this paper, we derive the relationship between the weak basis invariants (WB) related to CP violation responsible for leptogenesis and CP violation relevant at low energy. We examine all the experimental viable cases of Frampton-Glashow and Yanagida (FGY) model, in order to construct the WB invariants in terms of left handed Majorana neutrino mass matrix elements, and thus finding the necessary and sufficient condition for CP conservation. Further for all the viable FGY texture zeros, we have shown the explicit dependence of WB invariants on Dirac type and Majorana type CP violating phases. In the end, we discuss the implication of such interrelationships on leptogenesis.

    hep-phPTEP(2020)·4 citations
15. 15*

    Constructing d-log integrands and computing master integrals for three-loop four-particle scattering

    Johannes Henn🇩🇪 · Bernhard Mistlberger🇺🇸 · Vladimir A. Smirnov🇷🇺 · Pascal Wasser🇩🇪

    We compute all master integrals for massless three-loop four-particle scattering amplitudes required for processes like di-jet or di-photon production at the LHC. We present our result in terms of a Laurent expansion of the integrals in the dimensional regulator up to 8${}^{\text{th}}$ power, with coefficients expressed in terms of harmonic polylogarithms. As a basis of master integrals we choose integrals with integrands that only have logarithmic poles - called $d$log forms. This choice greatly facilitates the subsequent computation via the method of differential equations. We detail how this basis is obtained via an improved algorithm originally developed by one of the authors. We provide a public implementation of this algorithm. We explain how the algorithm is naturally applied in the context of unitarity. In addition, we classify our $d$log forms according to their soft and collinear properties.

    hep-phhep-thJHEP(2020)·158 citations
16. 16*

    Lattice QCD Impact on Determination of CKM Matrix: Status and Prospects

    Steven Gottlieb (Indiana University)🇺🇸

    Lattice QCD is an important tool for theoretical input for flavor physics. There have been four reviews by the Flavour Lattice Averaging Group (FLAG). This talk will review the current status of the magnitude of eight of the nine CKM matrix elements, borrowing heavily from the most recent FLAG review (co-authored by the speaker). Future prospects for improving the determination of the CKM matrix will be discussed.

    ↳ hep-lathep-phPoS(2020)·4 citations
17. 17*

    Mixed State Dynamics with Non-Local Interactions

    Erik W. Lentz🇩🇪 · Leon Lettermann🇩🇪 · Thomas R. Quinn🇺🇸 · Leslie J Rosenberg🇺🇸

    The evolution of degenerate matter out of equilibrium is a topic of interest in fields such as condensed matter, nuclear and atomic physics, and increasingly cosmology, including inflaton physics prior to reheating. This follow-up paper extends the recent paper on the super-de Broglie dynamics of pure condensates of non-relativistic identical particles subject to non-local two-body interactions to the dynamics of mixed states. It is found that the two-body correlation function plays an increasingly dynamical role in these systems, driving the development of condensates and distributed phases alike. Examples of distribution and correlation evolution are presented, including instances of collapse, bound and unbound states, and phonons in the bulk. Potential applications are also discussed.

    ↳ astro-ph.COcond-mat.str-elhep-phquant-phNPB(2020)·1 citation
18. 18*

    Strangeness in Nuclei and Neutron Stars

    Laura Tolos🇩🇪 · Laura Fabbietti🇩🇪

    We review the present status of the experimental and theoretical developments in the field of strangeness in nuclei and neutron stars. We start by discussing the $\bar{K}N$ interaction, that is governed by the presence of the $\Lambda (1405)$. We continue by showing the two-pole nature of the $\Lambda (1405)$, and the production mechanisms in photon-, pion-, kaon-induced reactions as well as proton-proton collisions, while discussing the formation of $\bar{K}NN$ bound states. We then move to the theoretical and experimental analysis of the properties of kaons and antikaons in dense nuclear matter, paying a special attention to kaonic atoms and the analysis of strangeness creation and propagation in nuclear collisions. Next, we examine the $\varphi$ meson and the advances in photoproduction, proton-induced and pion-induced reactions, so as to understand its properties in dense matter. Finally, we address the dynamics of hyperons with nucleons and nuclear matter, and the connection to the phases of dense matter with strangeness in the interior of neutron stars.

    ↳ nucl-exhep-exhep-phnucl-thPPNP(2020)·306 citations
19. 19*

    Multi-${\pi }^{+}$ systems in finite volume

    Peng Guo🇺🇸 · Bingwei Long🇨🇳

    We present a formalism to describe two-${\pi }^{+}$ and three-${\pi }^{+}$ dynamics in finite volume, the formalism is based on combination of a variational approach and the Faddeev method. Both pair-wise and three-body interactions are included in the presentation. Impacts of finite lattice spacing and the cubic lattice symmetry are also discussed. To illustrate application of the formalism, the pair-wise contact interaction that resembles the leading order interaction terms in chiral effective theory is used to analyze recent lattice results.

    ↳ hep-lathep-phPRD(2020)·36 citations
20. 20*

    Improvement, generalization, and scheme conversion of Wilson-line operators on the lattice in the auxiliary field approach

    Jeremy R. Green🇨🇭 · Karl Jansen🇩🇪 · Fernanda Steffens🇩🇪

    Nonlocal quark bilinear operators connected by link paths are used for studying parton distribution functions (PDFs) and transverse momentum-dependent PDFs of hadrons using lattice QCD. The nonlocality makes it difficult to understand the renormalization and improvement of these operators using standard methods. In previous work, we showed that by introducing an auxiliary field on the lattice, one can understand an on-axis Wilson-line operator as the product of two local operators in an extended theory. In this paper, we provide details about the calculation in perturbation theory of the factor for conversion from our lattice-suitable renormalization scheme to the MS-bar scheme. Extending our work, we study Symanzik improvement of the extended theory to understand the pattern of discretization effects linear in the lattice spacing, $a$, which are present even if the lattice fermion action exactly preserves chiral symmetry. This provides a prospect for an eventual $O(a)$ improvement of lattice calculations of PDFs. We also generalize our approach to apply to Wilson lines along lattice diagonals and to piecewise-straight link paths.

    ↳ hep-lathep-phPRD(2020)·53 citations
21. 21*

    Quantum Detection using Magnetic Avalanches in Single-Molecule Magnets

    Hao Chen🇺🇸 · Rupak Mahapatra🇺🇸 · Glenn Agnolet🇺🇸 · Michael Nippe · Minjie Lu · Philip C. Bunting🇺🇸 · Tom Melia🇯🇵 · Surjeet Rajendran🇺🇸 · Giorgio Gratta🇺🇸 · Jeffrey Long🇺🇸

    The detection of a single quantum of energy with high efficiency and low false positive rate is of considerable scientific interest, from serving as single quantum sensors of optical and infra-red photons to enabling the direct detection of low-mass dark matter. We report the first experimental demonstration of magnetic avalanches induced by scattering of quanta in single-molecule magnet (SMM) crystals made of Mn12-acetate, establishing the use of SMMs as particle detectors for the first time. While the current setup has an energy threshold in the MeV regime, our results motivate the exploration of a wide variety of SMMs whose properties could allow for detection of sub-eV energy depositions.

    ↳ physics.ins-detcond-mat.mes-hallhep-exhep-ph13 citations
22. 22*

    Orbital evidences for dark-matter-free Milky Way dwarf spheroidal galaxies

    Francois Hammer🇫🇷 · Yanbin Yang🇫🇷 · Frederic Arenou🇫🇷 · Jianling Wang🇨🇳 · Hefan Li🇨🇳 · Piercarlo Bonifacio🇫🇷 · Carine Babusiaux🇫🇷

    The nature of Milky Way dwarf spheroidals (MW dSphs) has been questioned, in particular whether they are dominated by dark matter (DM). Here we investigate an alternative scenario, for which tidal shocks are exerted by the MW to DM-free dSphs after a first infall of their gas-rich progenitors, and for which theoretical calculations have been verified by pure N-body simulations. Whether or not the dSphs are on their first infall cannot be resolved on the sole basis of their star formation history. In fact, gas removal may cause complex gravitational instabilities and near-pericenter passages can give rise to tidal disruptive processes. Advanced precision with the Gaia satellite in determining both their past orbital motions and the MW velocity curve is, however, providing crucial results. First, tidal shocks explain why DM-free dSphs are found preferentially near their pericenter, where they are in a destructive process, while their chance to be long-lived satellites is associated with a very low probability P~ 2 10^-7, which is at odds with the current DM-dominated dSph scenario. Second, most dSph binding energies are consistent with a first infall. Third, the MW tidal shocks that predict the observed dSph velocity dispersions are themselves predicted in amplitude by the most accurate MW velocity curve. Fourth, tidal shocks accurately predict the forces or accelerations exerted at half-light radius of dSphs, including the MW and the Magellanic System gravitational attractions. The above is suggestive of dSphs that are DM-free and tidally shocked near their pericenters, which may provoke a significant quake in our understanding of near-field cosmology.

    ↳ astro-ph.GAgr-qchep-phhep-thApJ(2020)·21 citations
23. 23*

    Generation of chiral asymmetry via helical magnetic fields

    Jennifer Schober · Tomohiro Fujita · Ruth Durrer

    It is well known that helical magnetic fields undergo a so-called inverse cascade by which their correlation length grows due to the conservation of magnetic helicity in classical ideal magnetohydrodynamics (MHD). At high energies above approximately $10$ MeV, however, classical MHD is necessarily extended to chiral MHD and then the conserved quantity is $⟨\mathcal{H}⟩+2⟨{\mu }_5⟩/\lambda$ with $⟨\mathcal{H}⟩$ being the mean magnetic helicity and $⟨{\mu }_5⟩$ being the mean chiral chemical potential of charged fermions. Here, $\lambda$ is a (phenomenological) chiral feedback parameter. In this paper, we study the evolution of the chiral MHD system with the initial condition of nonzero $⟨\mathcal{H}⟩$ and vanishing ${\mu }_5$. We present analytic derivations for the time evolution of $⟨\mathcal{H}⟩$ and $⟨{\mu }_5⟩$ that we compare to a series of laminar and turbulent three-dimensional direct numerical simulations. We find that the late-time evolution of $⟨\mathcal{H}⟩$ depends on the magnetic and kinetic Reynolds numbers ${\mathrm{Re}}_{{}_{\mathrm{M}}}$ and ${\mathrm{Re}}_{{}_{\mathrm{K}}}$. For a high ${\mathrm{Re}}_{{}_{\mathrm{M}}}$ and ${\mathrm{Re}}_{{}_{\mathrm{K}}}$ where turbulence occurs, $⟨\mathcal{H}⟩$ eventually evolves in the same way as in classical ideal MHD where the inverse correlation length of the helical magnetic field scales with time $t$ as $k_{\mathrm{p}}\propto t^{-2/3}$. For a low Reynolds numbers where the velocity field is negligible, the scaling is changed to $k_{\mathrm{p}}\propto t^{-1/2}\ln \left(t/t_{\log }\right)$. After being rapidly generated, $⟨{\mu }_5⟩$ always decays together with $k_{\mathrm{p}}$, i.e. $⟨{\mu }_5⟩\approx k_{\mathrm{p}}$, with a time evolution that depends on whether the system is in the limit of low or high Reynolds numbers.

    ↳ physics.plasm-phastro-ph.COastro-ph.HEcond-mat.soft+1PRD(2020)·20 citations
24. 24*

    New data on young and old black holes and other unexpected creatures

    A.D. Dolgov🇷🇺

    A review on recent astronomical observations indicating to unexpectedly abundant population of the contemporary and $z\sim 10$ universe by massive black holes in all mass ranges are is presented. It is argued that these black holes are mostly primordial. The data on some other stellar-kind objects which are also may be primordial are discussed.

    ↳ astro-ph.GAastro-ph.COhep-ph0 citations
25. 25*

    Scaled variables and the quark-hadron duality

    A.S. Parvan🇷🇺

    The thermodynamic quantities of the ideal gas of hadrons and the $(2+1)$--flavor lattice QCD scaled by the effective degeneracy factors of the corresponding models are compared. We have found that in terms of the scaled variables the quark-hadron duality of the lattice QCD and the hadron resonance gas (HRG) model disappears. However, we have unexpectedly revealed that the scaled variables lead to the quark-hadron duality of the lattice QCD and the quantum ideal gas of kaons and antikaons, namely, the ideal gas of those hadrons that contain all the three quarks $u,d,s$ and their antiquarks. Satisfactory agreement between the scaled results of the kaon ideal gas and the lattice QCD data is achieved at large values of the volume in the entire temperature range. In the ideal gas of kaons there is no any phase transition. Nevertheless, in our calculations the scaled thermodynamic quantities of the ideal gas and the lattice QCD follow the same qualitative behavior and are consistent with each other especially at high temperatures in the perturbative region.

    ↳ nucl-thhep-phEPJA(2020)·1 citation
26. 26*

    Study of diffusion coefficients of identified particles at energies available at BNL Relativistic Heavy Ion Collider

    Vivek Kumar Singh🇮🇳 · D. K. Mishra🇮🇳 · Zubayer Ahammed🇮🇳

    Using event-by-event fluctuations, we study the diffusion parameters of net-charge, net-pion, net-kaon, and net-proton in the heavy-ion jet interaction generator (HIJING), and ultra-relativistic quantum molecular dynamics (UrQMD) models at different collision energies \sqsn available at BNL Relativistic Heavy Ion Collider (RHIC). The diffusion parameter ($\sigma$) of net-charge and identified particles are estimated in rapidity space at various \sqsn. It is observed that, the $\sigma$ values are independent of collision energies but emphasises the particle-species dependence of diffusion coefficient in the QGP medium. The present work on particle-species dependence of diffusion coefficient provides a baseline for comparison with the experimental data.

    ↳ nucl-thhep-phEPJA(2020)·1 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.