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Nuclear Theory·nucl-th

Wednesday·September 16, 2015

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 15 Sept 2015] (cross-list from hep-ph)

    Energy dependence of the ridge in high multiplicity proton-proton collisions

    Kevin Dusling🇺🇸 · Prithwish Tribedy🇺🇸 · Raju Venugopalan🇺🇸

    We demonstrate that the recent measurement of azimuthally collimated, long range rapidity ("ridge") correlations in TeV proton-proton (p+p) collisions by the ATLAS collaboration at the LHC are in agreement with expectations from the color glass condensate effective theory of high energy QCD. The observation that the integrated near side yield as a function of multiplicity is independent of collision energy is a natural consequence of the fact that multiparticle production is driven by a single semi-hard saturation scale in the color glass condensate framework. We argue further that the azimuthal structure of these recent ATLAS ridge measurements strongly constrain hydrodynamic interpretations of such correlations in high multiplicity p+p collisions.

    Comments:
    7 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1509.04410 [pdf]
    PRD(2016)·37 citations
  2. 07

    [Submitted on 15 Sept 2015] (cross-list from hep-ph)

    Initial state in heavy ion collisions

    T. Lappi🇫🇮

    We briefly review advances in understanding the initial stages of a heavy ion collision. In particular the focus is on moving from parametrizing the initial state to calculating its properties from QCD, consistently with the description of hard probes and dilute-dense scattering experiments. Modeling the event-by-event fluctuating nuclear geometry in initial state calculations has significantly improved in recent years. We also discuss prospects of directly seeing effects of particle correlations created in the initial state in the experimental observables.

    Comments:
    6 pages, 3 figures. Plenary talk at Hard Probes 2015 conference, Montreal, QC, June/July 2015
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1509.04503 [pdf]
    Nucl.Part.Phys.Proc.(2016)·9 citations
  3. 08

    [Submitted on 15 Sept 2015] (cross-list from hep-ph)

    Heavy-flavor transport

    Andrea Beraudo🇮🇹

    The formation of a hot deconfined medium (Quark-Gluon Plasma) in high-energy nuclear collisions affects heavy-flavor observables. In the low/moderate-pT range transport calculations allow one to simulate the propagation of heavy quarks in the plasma and to evaluate the effect of the medium on the final hadronic spectra: results obtained with transport coefficients arising from different theoretical approaches can be compared to experimental data. Finally, a discussion of possible effects on heavy-flavor observables due to the possible formation of a hot-medium in small systems (like in p-A collisions) is presented.

    Comments:
    8 pages, plenary talk at the conference Strangeness in Quark Matter 2015
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1509.04530 [pdf]
    J.Phys.Conf.Ser.(2016)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE