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Nuclear Theory·nucl-th

Friday·July 6, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 2 Jul 2018] (cross-list from hep-ph)

    Systematics of azimuthal anisotropy harmonics in proton-nucleus collisions at the LHC from the Color Glass Condensate

    Mark Mace🇺🇸 · Vladimir V. Skokov🇺🇸 · Prithwish Tribedy🇺🇸 · Raju Venugopalan🇺🇸

    Simple power counting arguments in the dilute-dense framework of the Color Glass Condensate (CGC) Effective Field Theory predict that even and odd azimuthal anisotropy harmonics of two-particle correlations in proton-nucleus collisions at the LHC will respectively satisfy v^2_{2n} ~ N_{ch}^0 and v^2_{2n+1} ~ N_{ch}, where N_{ch} denotes the number of charged particles. We show that these expectations are borne out qualitatively, and even quantitatively, within systematic uncertainties, for v_2 and v_4 in comparisons with data from the ATLAS collaboration. We also observe that ATLAS data for the v_3 azimuthal harmonic are in excellent agreement with our qualitative expectation; quantitative comparisons are numerically challenging at present. The lessons from this study fully complement those gained by the recent comparison of the CGC dilute-dense framework [arXiv:1805.09342] to data from the PHENIX collaboration on small system collisions at RHIC.

    Comments:
    6 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1807.00825 [pdf]
    PLB(2019)·65 citations
  2. 06

    [Submitted on 5 Jul 2018] (cross-list from hep-th)

    General thermodynamic equilibrium with axial chemical potential for the free Dirac field

    M. Buzzegoli (U. Florence)🇮🇹 · F. Becattini (U. Florence)🇮🇹

    We calculate the constitutive equations of the stress-energy tensor and the currents of the free massless Dirac field at thermodynamic equilibrium with acceleration and rotation and a conserved axial charge by using the density operator approach. We carry out an expansion in thermal vorticity to the second order with finite axial chemical potential . The obtained coefficients of the expansion are expressed as correlators of angular momenta and boost operators with the currents. We confirm previous observations that the axial chemical potential induces non-vanishing components of the stress-energy tensor at first order in thermal vorticity due to breaking of parity invariance of the density operator with . The appearance of these components might play an important role in chiral hydrodynamics.

    Comments:
    29 pages, final version published in JHEP, typos
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1807.02071 [pdf]
    JHEP(2018)·42 citations
  3. 07

    [Submitted on 5 Jul 2018] (cross-list from hep-th)

    Ordered arrays of Baryonic tubes in the Skyrme model in (3+1) dimensions at finite density

    Fabrizio Canfora🇨🇱

    A consistent ansatz for the Skyrme model in (3+1)-dimensions which is able to reduce the complete set of Skyrme field equations to just one equation for the profile in situations in which the Baryon charge can be arbitrary large is introduced: moreover, the field equation for the profile can be solved explicitly. Such configurations describe ordered arrays of Baryonic tubes living in flat space-times at finite density. The plots of the energy density (as well as of the Baryon density) clearly show that the regions of maximal energy density have the shape of a tube: the energy density and the Baryon density depend periodically on two spatial directions while they are constant in the third spatial direction. Thus, these topologically non-trivial crystal-like solutions can be intepreted as configurations in which most of the energy density and the baryon density are concentrated within tube-shaped regions. The positions of the energy-density peaks can be computed explicitly and they manifest a clear crystalline order. A non-trivial stability test is discussed.

    Comments:
    19 pages, 2 figures. A detailed discussion of the Baryon density distribution has ben included (the title has been changed accordingly). The comparison with the rational map approach has been included as well (together with relevant references). This version has been accepted for publication on EUROPEAN PHYSICAL JOURNAL C
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1807.02090 [pdf]
    EPJC(2018)·57 citations
  4. 08

    [Submitted on 5 Jul 2018] (cross-list from hep-ph)

    Effect of flavor-dependent partonic transverse momentum on the determination of the boson mass in hadronic collisions

    Alessandro Bacchetta🇮🇹 · Giuseppe Bozzi🇮🇹 · Marco Radici🇳🇱 · Mathias Ritzmann🇺🇸 · Andrea Signori🇺🇸

    Within the framework of transverse-momentum-dependent factorization, we investigate for the first time the impact of a flavor-dependent intrinsic transverse momentum of quarks on the production of bosons in proton-proton collisions at = 7 TeV. We estimate the shift in the extracted value of the boson mass induced by different choices of flavor-dependent parameters for the intrinsic quark transverse momentum by means of a template fit to the transverse-mass and the lepton transverse-momentum distributions of the -decay products. We obtain MeV and MeV with a statistical uncertainty of MeV. Our findings call for more detailed investigations of flavor-dependent nonperturbative effects linked to the proton structure at hadron colliders.

    Comments:
    5 pages, 2 tables; revised version with new results with more statistics, more comments, conclusions unchanged, added one reference
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1807.02101 [pdf]
    PLB(2019)·54 citations

Affiliations

first authorsco-authorsvia INSPIRE