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Nuclear Theory·nucl-th

Wednesday·May 25, 2016

9 papers—7 primary·2 cross-listed

All9Primary7Cross-lists2
  1. 08

    [Submitted on 23 May 2016] (cross-list from hep-ph)

    Next-to-leading order transverse momentum broadening for Drell-Yan production in p+A collisions

    Zhong-Bo Kang🇺🇸 · Jian-Wei Qiu🇺🇸 · Xin-Nian Wang🇨🇳 · Hongxi Xing🇺🇸

    We present the nuclear transverse momentum broadening for Drell-Yan lepton pair production in p+A collisions at next-to-leading order (NLO) in powers of strong coupling constant . We verify that the transverse momentum weighted differential cross section in NLO perturbative QCD (pQCD) at twist-4 can be factorized into the convolution of parton distribution function of an active parton in the projectile proton, a twist-4 multiparton correlation function of the target nucleus, and perturbatively calculable hard coefficient function. We identify a QCD evolution equation for such a twist-4 nuclear gluon-quark correlation function, and verify its universality -- its process independence. This finding demonstrates the prediction power of pQCD factorization approach for studying parton multiple scattering in nuclear medium.

    Comments:
    18 pages, 12 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1605.07175 [pdf]
    PRD(2016)·20 citations
  2. 09

    [Submitted on 23 May 2016] (cross-list from hep-ph)

    Simulating collisions of thick nuclei in the color glass condensate framework

    Daniil Gelfand🇦🇹 · Andreas Ipp🇦🇹 · David Müller🇦🇹

    We present our work on the simulation of the early stages of heavy-ion collisions with finite longitudinal thickness in the laboratory frame in 3+1 dimensions. In particular we study the effects of nuclear thickness on the production of a glasma state in the McLerran-Venugopalan model within the color glass condensate framework. A finite thickness enables us to describe nuclei at lower energies, but forces us to abandon boost-invariance. As a consequence, random classical color sources within the nuclei have to be included in the simulation, which is achieved by using the colored particle-in-cell (CPIC) method. We show that the description in the laboratory frame agrees with boost-invariant approaches as a limiting case. Furthermore we investigate collisions beyond boost-invariance, in particular the pressure anisotropy in the glasma.

    Comments:
    22 pages, 11 figures; v2: Minor corrections
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1605.07184 [pdf]
    PRD(2016)·41 citations

Affiliations

first authorsco-authorsvia INSPIRE