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Nuclear Theory·nucl-th

Friday·December 15, 2017

12 papers—9 primary·3 cross-listed

All12Primary9Cross-lists3
  1. 10

    [Submitted on 12 Dec 2017] (cross-list from hep-ph)

    Thermal radiation and entanglement in proton-proton collisions at the LHC

    O.K. Baker🇺🇸 · D.E. Kharzeev🇺🇸

    The origin of the apparent thermalization in high-energy collisions is investigated using the data of the ATLAS and CMS Collaborations at the LHC. For this purpose, we analyze the transverse momentum distributions in the following proton-proton collision processes, all at TeV: i) inclusive inelastic collisions; ii) single- and double-diffractive Drell-Yan production ; and iii) Higgs boson production. We confirm the relation between the effective temperature and the hard scattering scale observed at lower energies, and find that it extends even to the Higgs boson production process. In addition we find that the thermal component disappears in diffractive events (even though many charged hadrons are still produced). We discuss the implications of our study for the mechanism of multi-particle production -- in particular, we test the hypothesis about the link between quantum entanglement and thermalization in high-energy collisions.

    Comments:
    20 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1712.04558 [pdf]
    PRD(2018)·98 citations
  2. 11

    [Submitted on 13 Dec 2017] (cross-list from nucl-ex)

    Experimental signals for broken axial symmetry in excited heavy nuclei from the valley of stability

    Eckart Grosse · Arnd R. Junghans

    An increasing number of experimental data indicates the breaking of axial symmetry in many heavy nuclei already in the valley of stability: Multiple Coulomb excitation analysed in a rotation invariant way, gamma transition rates and energies in odd nuclei, mass predictions, the splitting of Giant Resonances (GR), the collective enhancement of nuclear level densities and Maxwellian averaged neutron capture cross sections. For the interpretation of these experimental observations the axial symmetry breaking shows up in nearly all heavy nuclei as predicted by Hartree-Fock-Bogoliubov (HFB) calculations [1] ; this indicates a nuclear Jahn-Teller effect. We show that nearly no parameters remain free to be adjusted by separate fitting to level density or giant resonance data, if advance information on nuclear deformations, radii etc. are taken from such calculations with the force parameters already fixed. The data analysis and interpretation have to include the quantum mechanical requirement of zero point oscillations and the distinction between static vs. dynamic symmetry breaking has to be regarded.

    Comments:
    12 pages, 4 figures, Presented at XXIV Kazimierz NPW 20-24 IX 2017, to appear in Acta Physica Polonica B
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1712.04999 [pdf]
    Acta Phys.Polon.Supp.(2018)·0 citations
  3. 12

    [Submitted on 14 Dec 2017] (cross-list from hep-ph)

    Chiralspin symmetry and QCD at high temperature

    L. Ya. Glozman🇦🇹

    It has been found very recently on the lattice that at high temperature at vanishing chemical potential QCD is increasingly SU(2)_CS and SU(2N_F) symmetric. We demonstrate that the chemical potential term in the QCD Lagrangian has precisely the same symmetry. Consequently the QCD matter beyond the chiral restoration line on the T - \mu plane is at least approximately SU(2)_CS and SU(2N_F) symmetric.

    Comments:
    3 pages, final version to appear in EPJA
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1712.05168 [pdf]
    EPJA(2018)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE