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Nuclear Theory·nucl-th

Tuesday·January 11, 2022

14 papers—10 primary·4 cross-listed

All14Primary10Cross-lists4
  1. 11

    [Submitted on 7 Jan 2022] (cross-list from hep-ph)

    Neutron Stars with Baryon Number Violation, Probing Dark Sectors

    Jeffrey M. Berryman🇺🇸 · Susan Gardner🇺🇸 · Mohammadreza Zakeri🇺🇸

    The neutron lifetime anomaly has been used to motivate the introduction of new physics with hidden-sector particles coupled to baryon number, and on which neutron stars provide powerful constraints. Although the neutron lifetime anomaly may eventually prove to be of mundane origin, we use it as motivation for a broader review of the ways that baryon number violation, be it real or apparent, and dark sectors can intertwine and how neutron star observables, both present and future, can constrain them.

    Comments:
    81 pages, 16 figures. Invited contribution to special issue of Symmetry, "The Neutron Star-Dark Matter Connection: Bridge Through the Baryon Symmetry Violation." Updated to reflect accepted version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2201.02637 [pdf]
    Symmetry(2022)·50 citations
  2. 12

    [Submitted on 8 Jan 2022] (cross-list from hep-lat)

    Optimized Two-Baryon Operators in Lattice QCD

    Yan Lyu🇨🇳 · Hui Tong🇨🇳 · Takuya Sugiura🇯🇵 · Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Tetsuo Hatsuda🇯🇵 · Jie Meng🇨🇳 · Takaya Miyamoto🇯🇵

    A set of optimized interpolating operators which are dominantly coupled to each eigenstate of two baryons on the lattice is constructed by the HAL QCD method. To test its validity, we consider heavy dibaryons () calculated by (2+1)-flavor lattice QCD simulations with nearly physical pion mass. The optimized two-baryon operators are shown to provide effective energies of the ground and excited states separately stable as a function of the Euclidean time. Also they agree to the eigenenergies in a finite lattice box obtained from the leading-order HAL QCD potential within statistical errors. The overlapping factors between the optimized sink operators and the state created by the wall-type source operator indicate that can be reliably extracted, no matter whether the spacetime correlation of two baryons is dominated by the ground state or the excited state. It is suggested that the optimized set of operators is useful for variational studies of hadron-hadron interactions.

    Comments:
    Accepted for publication in Physical Review D (8 pages, 7 figures)
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2201.02782 [pdf]
    PRD(2022)·15 citations
  3. 13

    [Submitted on 8 Jan 2022] (cross-list from hep-ph)

    Extracting the jet transport coefficient from hadron suppressions by confronting current NLO parton fragmentation functions

    Qing-Fei Han🇨🇳 · Man Xie🇨🇳 · Han-Zhong Zhang🇨🇳

    Nuclear modification factors of single hadrons and dihadrons at large transverse momentum () in high-energy heavy-ion collisions are studied in a next-to-leading-order (NLO) perturbative QCD parton model. Parton fragmentation functions (FFs) in collisions are modified due to jet energy loss which is proportional to the jet transport coefficient characterizing the interaction between the parton jet and the produced medium. By confronting 6 current sets of NLO parton FFs for large hadron productions, we extract quantitatively via a global fit to data for both single hadron and dihadron suppressions, and obtain at MeV in central collisions at GeV, and at MeV in central collisions at TeV. The numerical results show that the uncertainties for extraction are brought by the different contributions of gluon-to-hadron in the 6 sets of FFs due to gluon energy loss being times of quark energy loss.

    Comments:
    16 pages, 21 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2201.02796 [pdf]
    Eur.Phys.J.Plus(2022)·9 citations
  4. 14

    [Submitted on 9 Jan 2022] (cross-list from cond-mat.str-el)

    Biexciton-like quartet condensates in an electron-hole liquid

    Yixin Guo · Hiroyuki Tajima · Haozhao Liang

    We theoretically study the ground-state properties and the condensations of exciton-like Cooper pairs and biexciton-like Cooper quartets in an electron-hole system. Applying the variational approach associated based on the quartet Bardeen-Cooper-Schrieffer (BCS) model to the four-component fermionic system consisting of spin-1/2 electrons and spin-1/2 holes, we show how Cooper pairs and quartet correlations appear in the equation of state at the thermodynamic limit. The biexciton-like four-body correlations survive even at the high-density regime as a many-body BCS-like state of Cooper quartets. Our results are useful for further understanding of exotic matter in the interdisciplinary context of quantum many-body physics with multiple degrees of freedom.

    Comments:
    10 pages, 4 figures
    Subjects:
    Strongly Correlated Electrons (cond-mat.str-el); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Gases (cond-mat.quant-gas); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    2201.03031 [pdf]
    PRResearch(2022)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE