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Nuclear Theory·nucl-th

Tuesday·March 22, 2016

11 papers—7 primary·4 cross-listed

All11Primary7Cross-lists4
  1. 08

    [Submitted on 21 Mar 2016] (cross-list from hep-ph)

    How the X(5568) challenges our understanding of QCD

    Feng-Kun Guo🇨🇳 · Ulf-G. Meißner🇨🇳 · Bing-Song Zou🇨🇳

    We discuss the X(5568) particle recently announced by the D0 Collaboration. Several types of models were proposed to explain this structure in the literature. As pointed out by Burns and Swanson (arXiv:1603.04366), none of them provides a satisfactory description of the observation. We provide additional arguments using general properties of QCD, and conclude that the observation of the X(5568), if confirmed, poses serious challenges to our understanding of nonperturbative QCD.

    Comments:
    5 pages. Typos removed, a wrong statement corrected, conclusions unchanged; the LHCb preliminary result mentioned at the end
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1603.06316 [pdf]
    Commun.Theor.Phys.(2016)·75 citations
  2. 09

    [Submitted on 21 Mar 2016] (cross-list from astro-ph.HE)

    Spectral splits of neutrinos as a BCS-BEC crossover type phenomenon

    Y. Pehlivan🇹🇷 · A. L. Subaşı🇹🇷 · N. Ghazanfari🇹🇷 · S. Birol🇹🇷 · H. Yüksel🇹🇷

    We show that the spectral split of a neutrino ensemble which initially consists of electron type neutrinos, is analogous to the BCS-BEC crossover already observed in ultra cold atomic gas experiments. Such a neutrino ensemble mimics the deleptonization burst of a core collapse supernova. Although these two phenomena belong to very different domains of physics, the propagation of neutrinos from highly interacting inner regions of the supernova to the vacuum is reminiscent of the evolution of Cooper pairs between weak and strong interaction regimes during the crossover. The Hamiltonians and the corresponding many-body states undergo very similar transformations if one replaces the pair quasispin of the latter with the neutrino isospin of the former.

    Comments:
    9 pages, 5 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.06360 [pdf]
    PRD(2017)·19 citations
  3. 10

    [Submitted on 21 Mar 2016] (cross-list from hep-ph)

    Masses of open charm and bottom tetraquark states in a relativized quark model

    Qi-Fang Lü🇨🇳 · Yu-Bing Dong🇨🇳

    We study the masses of open charm and bottom tetraquark states within the diquark-antidiquark scenario in the relativized quark model proposed by Godfrey and Isgur. The diquark and antidiquark masses are firstly solved by relativized quark potential, and then treated as the usual antiquark and quark, respectively. The masses of tetraquark states are obtained by solving the Schrödinger-type equation between the new diquark and antidiquark. We find the masses of tetraquark configuration are much higher than that of . This conclusion disfavors the possibility of as a tetraquark state within the diquark-antidiquark scenario. Further experimental searches are needed to clarify the nature of the signal observed by D0 collaboration.

    Comments:
    5 pages, 1 figure, 2 tables. Version accepted by Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1603.06417 [pdf]
    PRD(2016)·52 citations
  4. 11

    [Submitted on 21 Mar 2016] (cross-list from hep-ph)

    Universal Strangeness Production in Hadronic and Nuclear Collisions

    P.Castorina🇮🇹 · S.Plumari🇮🇹 · H.Satz🇩🇪

    We show that strangeness suppression in hadronic and nuclear collisions is fully determined by the initial energy density of the collision. The suppression factor , with denoting the collision energy, can be expressed as a universal function of the initial energy density , and the resulting pattern is in excellent agreement with data from and data over a wide range of energies and for different centralities.

    Comments:
    more general formulation
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.06529 [pdf]
    IJMPE(2016)·22 citations

Affiliations

first authorsco-authorsvia INSPIRE