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Nuclear Theory·nucl-th

Wednesday·January 18, 2017

9 papers—7 primary·2 cross-listed

All9Primary7Cross-lists2
  1. 08

    [Submitted on 16 Jan 2017] (cross-list from hep-ph)

    Pascalutsa-Vanderhaeghen light-by-light sumrule from photon-photon collisions

    Ling-Yun Dai🇺🇸 · M.R. Pennington🇺🇸

    Light-by-light scattering sumrules based on general field theory principles relate cross-sections with different helicities. In this paper the simplest sumrule is tested for the and channels for "real" photon-photon collisions. Important contributions come from the long-lived pseudoscalar mesons and from di-meson intermediate states. The latest Amplitude Analysis of allows this contribution to be evaluated. However, we find that other multi-meson contributions up to 2.5 GeV are required to satisfy the sumrules. While data on three and four pion cross-sections exist, there is no information about their isospin and helicity decomposition. Nevertheless, we show the measured cross-sections are sufficiently large to ensure the sumrules for the helicity differences are likely fulfilled.

    Comments:
    13 pages, 1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.04460 [pdf]
    PRD(2017)·8 citations
  2. 09

    [Submitted on 28 Dec 2016] (cross-list from nucl-ex)

    Overview of ALICE results in pp, pA and AA collisions

    R. Schicker (for the ALICE Collaboration)🇩🇪

    The ALICE experiment at the Large Hadron Collider (LHC) at CERN is optimized for recording events in the very large particle multiplicity environment of heavy-ion collisions at LHC energies. The ALICE collaboration has taken data in Pb-Pb collisions in Run I and Run II at nucleon-nucleon center-of-mass energies = 2.76 and \mbox{5.02 TeV}, respectively, and in pp collisions at center-of-mass energies = 0.9, 2.76, 5.02, 7, 8 and 13 TeV. The asymmetric system p-Pb was measured at a center-of-mass energy = 5.02 TeV. Selected physics results from the analysis of these data are presented, and an outline of the ALICE prospects for Run III is given.

    Comments:
    12 pages, 10 figures, Invited Talk at XXIII International Baldin Seminar on High Energy Physics Problems, September 19-24, 2016, Dubna, to be published in Seminar Proceedings
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.04810 [pdf]
    EPJ Web Conf.(2017)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE