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Nuclear Theory·nucl-th

Thursday·November 9, 2017

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 8 Nov 2017] (cross-list from hep-ph)

    The Physics Case for the GeV Energy Region

    J. Cleymans🇿🇦

    There are indications that the beam energy region GeV for heavy-ion collisions is an interesting one. The final state has the highest net baryon density at this beam energy. A transition from a baryon dominated to a meson dominated final state takes place around this beam energy. Ratios of strange particles to mesons show clear and pronounced maxima around this beam energy. The theoretical interpretation can be clarified by covering fully this energy region. In particular the strangeness content needs to be determined, data covering the full phase space () would be helpful to establish the properties of this energy region.

    Comments:
    6 pages 6 figures Walter Greiner memorial
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.02882 [pdf]
    6 citations
  2. 06

    [Submitted on 8 Nov 2017] (cross-list from hep-lat)

    Chiral phase transition of three flavor QCD with nonzero magnetic field using standard staggered fermions

    Akio Tomiya🇨🇳 · Heng-Tong Ding🇨🇳 · Swagato Mukherjee🇺🇸 · Christian Schmidt🇩🇪 · Xiao-Dan Wang🇨🇳

    Lattice simulations for (2+1)-flavor QCD with external magnetic field demonstrated that the quark mass is one of the important parameters responsible for the (inverse) magnetic catalysis. We discuss the dependences of chiral condensates and susceptibilities, the Polyakov loop on the magnetic field and quark mass in three degenerate flavor QCD. The lattice simulations are performed using standard staggered fermions and the plaquette action with spatial sizes Ns = 16 and 24 and a fixed temporal size Nt = 4. The value of the quark masses are chosen such that the system undergoes a first order chiral phase transition and crossover with zero magnetic field. We find that in light mass regime, the quark chiral condensate undergoes magnetic catalysis in the whole temperature region and the phase transition tend to become stronger as the magnetic field increases. In crossover regime, deconfinement transition temperature is shifted by the magnetic field when quark mass ma is less than 0.4. The lattice cutoff effects are also discussed.

    Comments:
    8 pages, 6 figures. Proceedings of the 35th International Symposium on Lattice Field Theory, 18-24 June 2017, Granada, Spain
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.02884 [pdf]
    EPJ Web Conf.(2018)·8 citations
  3. 07

    [Submitted on 8 Nov 2017] (cross-list from hep-ph)

    Exclusive vector meson photoproduction with a leading baryon in photon - hadron interactions at hadronic colliders

    F. Carvalho🇧🇷 · V.P. Goncalves🇧🇷 · F.S. Navarra🇧🇷 · D. Spiering🇧🇷

    Exclusive vector meson photoproduction associated with a leading baryon () in and collisions at RHIC and LHC energies is investigated using the color dipole formalism and taking into account nonlinear effects in the QCD dynamics. In particular, we compute the cross sections for , and production together with a and compare the predictions with those obtained for a leading neutron. Our results show that the cross section is almost 30 % of the one. Our results also show that a future experimental analysis of these processes is, in principle, feasible and can be useful to study leading particle production.

    Comments:
    7 pages, 4 figures, 1 table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1711.02957 [pdf]
    PRD(2018)·6 citations
  4. 08

    [Submitted on 8 Nov 2017] (cross-list from hep-ph)

    Transverse momentum spectra of hadrons in collisions at CERN SPS energies from the UrQMD transport model

    Vitalii Ozvenchuk🇵🇱 · Andrzej Rybicki🇵🇱

    The UrQMD transport model, version 3.4, is used to study the new experimental data on transverse momentum spectra of , , and produced in inelastic interactions at SPS energies, recently published by the NA61/SHINE Collaboration. The comparison of model predictions to these new measurements is presented as a function of collision energy for central and forward particle rapidity intervals. In addition, the inverse slope parameters characterizing the transverse momentum distributions are extracted from the predicted spectra and compared to the corresponding values obtained from NA61/SHINE distributions, as a function of particle rapidity and collision energy. A complex pattern of deviations between the experimental data and the UrQMD model emerges. For charged pions, the fair agreement visible at top SPS energies deteriorates with the decreasing energy. For charged mesons, UrQMD significantly underpredicts positive kaon production at lower beam momenta. It also underpredicts the central rapidity proton yield at top collision energy and overpredicts antiproton production at all considered energies. We conclude that the new experimental data analyzed in this paper still constitute a challenge for the present version of the model.

    Comments:
    15 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1711.02963 [pdf]
    NPA(2018)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE