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Nuclear Theory·nucl-th

Tuesday·May 26, 2020

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 05

    [Submitted on 22 May 2020] (cross-list from hep-ph)

    Decay of the pseudoscalar glueball into vector, axial-vector, scalar and pseudoscalar mesons

    Walaa I. Eshraim🇦🇪

    We resume the investigation of the ground-state pseudoscalar glueball, , by computing its two- and three-body decays into vector and axial-vector quark-antiquark meson fields additional to scalar and pseudoscalar mesons through the construction of an interaction chiral Lagrangian that produces these decays. We evaluate the branching ratio, via a parameter-free calculation, by setting the mass of the pseudoscalar glueball to GeV as predicted by lattice QCD simulations. We duplicate the computation for the branching ratios for a pseudoscalar glueball mass GeV which matches to the measured mass of the resonance in the BESIII experiment. The present channels and states are potentially reached and are interesting for the running BESIII and Belle-II experiments and the planned PANDA experiment at FAIR/GSI which will be able to detect the pseudoscalar glueball within the accessible energy range.

    Comments:
    12 pages, 4 tables, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2005.11321 [pdf]
    EPJC(2023)·10 citations
  2. 06

    [Submitted on 24 May 2020] (cross-list from hep-th)

    Nonlinear Constraints on Relativistic Fluids Far From Equilibrium

    Fabio S. Bemfica🇧🇷 · Marcelo M. Disconzi🇺🇸 · Vu Hoang🇺🇸 · Jorge Noronha🇺🇸 · Maria Radosz🇺🇸

    New constraints are found that must necessarily hold for Israel-Stewart-like theories of fluid dynamics to be causal far away from equilibrium. Conditions that are sufficient to ensure causality, local existence, and uniqueness of solutions in these theories are also presented. Our results hold in the full nonlinear regime, taking into account bulk and shear viscosities (at zero chemical potential), without any simplifying symmetry or near-equilibrium assumptions. Our findings provide fundamental constraints on the magnitude of viscous corrections in fluid dynamics far from equilibrium.

    Comments:
    18 pages, 1 figure
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th); Fluid Dynamics (physics.flu-dyn)
    arXiv:
    2005.11632 [pdf]
    PRL(2021)·129 citations
  3. 07

    [Submitted on 25 May 2020] (cross-list from hep-lat)

    Isovector parton distribution functions of the proton on a superfine lattice

    Zhouyou Fan🇺🇸 · Xiang Gao🇺🇸 · Ruizi Li🇺🇸 · Huey-Wen Lin🇺🇸 · Nikhil Karthik🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Sergey Syritsyn🇺🇸 · Yi-Bo Yang🇨🇳 · Rui Zhang🇺🇸

    We study isovector unpolarized and helicity parton distribution functions (PDF) of the proton within the framework of Large Momentum Effective Theory. We use a gauge ensemble, generated by the MILC Collaboration, with a superfine lattice spacing of fm and a pion mass of MeV, enabling us to simultaneously reach sub-fermi spatial separations and larger nucleon momenta. We compare the spatial dependence of quasi-PDF matrix elements in different renormalization schemes with the corresponding results of the global fits, obtained using 1-loop perturbative matching. We present determinations of the first four moments of the unpolarized and helicity PDFs of proton from the Ioffe-time dependence of the isovector matrix elements, obtained by employing a ratio-based renormalization scheme.

    Comments:
    28 pages, 34 figures. Accepted version for PRD
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.12015 [pdf]
    PRD(2020)·81 citations
  4. 08

    [Submitted on 25 May 2020] (cross-list from cond-mat.quant-gas)

    Low-Dimensional Fluctuations and Pseudogap in Gaudin-Yang Fermi Gases

    Hiroyuki Tajima · Shoichiro Tsutsui · Takahiro M. Doi

    Pseudogap is a ubiquitous phenomenon in strongly correlated systems such as high- superconductors, ultracold atoms and nuclear physics. While pairing fluctuations inducing the pseudogap are known to be enhanced in low-dimensional systems, such effects have not been explored well in one of the most fundamental 1D models, that is, Gaudin-Yang model. In this work, we show that the pseudogap effect can be visible in the single-particle excitation in this system using a diagrammatic approach. Fermionic single-particle spectra exhibit a unique crossover from the double-particle dispersion to pseudogap state with increasing the attractive interaction and the number density at finite temperature. Surprisingly, our results of thermodynamic quantities in unpolarized and polarized gases show an excellent agreement with the recent quantum Monte Carlo and complex Langevin results, even in the region where the pseudogap appears.

    Comments:
    6 pages, 5 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    2005.12124 [pdf]
    PRResearch(2020)·4 citations
  5. 09

    [Submitted on 25 May 2020] (cross-list from astro-ph.HE)

    Analytical determination of the structure of the outer crust of a cold nonaccreted neutron star: extension to strongly quantizing magnetic fields

    Nicolas Chamel · Zhivko Krastev Stoyanov

    The iterative method recently proposed for determining the internal constitution of the outer crust of a nonaccreted neutron star is extended to magnetars by taking into account the Landau-Rabi quantization of electron motion induced by the presence of a very high magnetic field. It is shown that in the strongly quantizing regime, the method can be efficiently implemented using new analytical solutions for the transitions between adjacent crustal layers. Detailed numerical computations are performed to assess the performance and precision of the method.

    Comments:
    13 pages. Typos corrected. Accepted for publication in Physical Review C. A computer code is available on Zenodo at http://doi.org/10.5281/zenodo.3839787 arXiv admin note: text overlap with arXiv:2003.00983
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2005.12127 [pdf]
    PRC(2020)·9 citations
  6. 10

    [Submitted on 25 May 2020] (cross-list from hep-ph)

    Characterizing Proton-Proton Collisions at the Large Hadron Collider with Thermal Properties

    Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳

    High-multiplicity proton-proton (pp) collisions at the Large Hadron Collider (LHC) energies have created a new domain of research to look for a possible formation of quark-gluon plasma in these events. In this paper, we estimate various thermal properties of the matter formed in pp collisions at the LHC energies, such as mean free path, isobaric expansivity, thermal pressure, and heat capacity using a thermodynamically consistent Tsallis distribution function. Particle species-dependent mean free path and isobaric expansivity are studied as functions of final state charged particle multiplicity for pp collisions at the center-of-mass energy = 7 TeV. The effects of degree of non-extensivity, baryochemical potential, and temperature on these thermal properties are studied. The findings are compared with the theoretical expectations.

    Comments:
    Same as the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2005.12176 [pdf]
    MDPI Physics(2021)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE