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Nuclear Theory·nucl-th

Thursday·August 24, 2017

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 29 Jul 2017] (cross-list from hep-ph)

    Revisiting the Equation of State of Hybrid Stars in the Dyson-Schwinger Equation Approach to QCD

    Zhan Bai🇨🇳 · Huan Chen🇮🇹 · Yu-xin Liu🇨🇳

    We investigate the equation of state(EoS) and the effect of the hadron-quark phase transition of strong interaction matter in compact stars. The hadron matter is described with the relativistic mean field theory,and the quark matter is described with the Dyson-Schwinger equation approach of QCD. The complete EoS of the hybrid star matter is constructed with not only the Gibbs construction but also the 3-window interpolation. The mass-radius relation of hybrid stars is also investigated. We find that, although the EoSs of both the hadron matter with hyperon and -baryon and the quark matter are generally softer than that of the nucleon matter, the 3-window interpolation construction may provide an EoS stiff enough for a hybrid star with mass exceeding 2 and, in turn, solve the so called "hyperon puzzle".

    Comments:
    19 pages, 27 figures, Completely a new appearance comparing the last version (with great extension)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1707.09535 [pdf]
    PRD(2018)·24 citations
  2. 07

    [Submitted on 21 Aug 2017] (cross-list from hep-ph)

    Search for axion-like dark matter through nuclear spin precession in electric and magnetic fields

    C. Abel🇬🇧 · N.J. Ayres🇬🇧 · G. Ban🇫🇷 · G. Bison🇨🇭 · K. Bodek🇵🇱 · V. Bondar🇧🇪 · M. Daum🇨🇭 · M. Fairbairn🇬🇧 · V.V. Flambaum🇦🇺 · P. Geltenbort🇫🇷 · K. Green🇬🇧 · W.C. Griffith🇬🇧 and 36 other authors

    We report on a search for ultra-low-mass axion-like dark matter by analysing the ratio of the spin-precession frequencies of stored ultracold neutrons and Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range . Our null result sets the first laboratory constraints on the coupling of axion dark matter to gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axion coupling to nucleons by up to a factor of 40.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1708.06367 [pdf]
    PRX(2017)·330 citations
  3. 08

    [Submitted on 22 Aug 2017] (cross-list from hep-ph)

    Thermodynamic and transport properties in Au + Au collisions at RHIC energies from the clustering of color strings

    Pragati Sahoo🇮🇳 · Swatantra Kumar Tiwari🇮🇳 · Sudipan De🇮🇳 · Raghunath Sahoo🇮🇳 · Rolf P. Scharenberg🇺🇸 · Brijesh K. Srivastava🇺🇸

    In this work, we have extracted the initial tempearture from the transverse momentum spectra of charged particles in collisions using STAR data at RHIC energies from = 7.7 to 200 GeV. The initial energy density (), shear viscosity to entropy density ratio (), trace anomaly (), the squared speed of sound (), entropy density, and bulk viscosity to entropy density ratio () are obtained and compared with the lattice QCD calculations for (2+1) flavor. The initial temperatures obtained are compared with various hadronization and chemical freeze-out temperatures. The analysis of the data shows that the deconfinement to confinement transition possibly takes place between = 11.5 and 19.6 GeV.

    Comments:
    Same as published version in MPLA
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1708.06689 [pdf]
    Mod.Phys.Lett.A(2019)·30 citations
  4. 09

    [Submitted on 22 Aug 2017] (cross-list from hep-ph)

    Analytic Boosted Boson Discrimination at the Large Hadron Collider

    Andrew J. Larkoski🇺🇸 · Ian Moult🇺🇸 · Duff Neill🇺🇸

    Jet substructure is playing a central role at the Large Hadron Collider (LHC) probing the Standard Model in extreme regions of phase space and providing innovative ways to search for new physics. Analytic calculations of experimentally successful observables are a primary catalyst driving developments in jet substructure, allowing for a deeper understanding of observables and for the exploitation of increasingly subtle features of jets. In this paper we present a field theoretic framework enabling systematically improvable calculations of groomed multi-prong substructure observables, which builds on recent developments in multi-scale effective theories. We use this framework to compute for the first time the full spectrum for groomed tagging observables at the LHC, carefully treating both perturbative and non-perturbative contributions in all regions. Our analysis enables a precision understanding which we hope will improve the reach and sophistication of jet substructure techniques at the LHC.

    Comments:
    5 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1708.06760 [pdf]
    40 citations
  5. 10

    [Submitted on 23 Aug 2017] (cross-list from hep-ph)

    potentials in chiral perturbation theory and possible molecular states

    Hao Xu🇨🇳 · Bo Wang🇨🇳 · Zhan-Wei Liu🇨🇳 · Xiang Liu🇨🇳

    The potentials are studied within the framework of heavy meson chiral effective field theory. We obtain the effective potentials of the system up to at the one-loop level. In addition to the one-pion exchange contribution, the contact and two-pion exchange interactions are also investigated in detail. Furthermore, we search for the possible molecular states by solving the Schrödinger equation with the potentials. We notice that the contact and two-pion exchange potentials are numerically non-negligible and important for the existence of a bound state. In our results, no bound state is found in the channel within a wide range of cutoff parameter, while there exists a bound state in the channel as the cutoff is near in our approach.

    Comments:
    18 pages, 12 figures. Published in Phys. Rev. D. We correct three typos in which and were mistaken for each other
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1708.06918 [pdf]
    PRD(2019)·73 citations
  6. 11

    [Submitted on 23 Aug 2017] (cross-list from hep-ph)

    Interplay between chiral symmetry breaking and the QCD Kondo effect

    Kei Suzuki🇯🇵 · Shigehiro Yasui🇯🇵 · Kazunori Itakura🇯🇵

    We investigate the interplay between the (light-light quark) chiral condensate and heavy-light quark condensate induced by the QCD Kondo effect, which is described by an effective Lagrangian with four-point interactions and the mean-field approximation. We find that the appearance of Kondo condensates decreases the critical chemical potential of the chiral condensate. In the region near the critical chemical potential, a coexistence phase with two kinds of condensates can appear. The behavior of such an interplay at finite temperature and with nonzero current light-quark mass is also discussed.

    Comments:
    9 pages, 7 figures; published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1708.06930 [pdf]
    PRD(2017)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE