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Nuclear Theory·nucl-th

Tuesday·February 17, 2015

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 08

    [Submitted on 14 Feb 2015] (cross-list from hep-ph)

    Evidence of Collective Flow in p-p Collision at LHC

    Inam-ul Bashir🇮🇳 · Riyaz Ahmed Bhat🇮🇳 · Saeed Uddin🇮🇳

    The transverse momentum distributions of hadrons produced in p-p collisions at LHC energies of Root(sNN) = 0.9 TeV, 2.76 TeV and Root(sNN) = 7.0 TeV have been studied using a unified statistical thermal freeze-out model. A good agreement is seen between the theoretical calculations and experimental data. The extracted thermal freeze-out parameters reveal the presence of significant collective flow and a well defined temperature in the system thus indicating the formation of a thermally equilibrated hydrodynamic system in p-p collisions at LHC. The transverse momentum distributions of protons and Kaons produced in p-p collisions at Root(sNN) = 200 GeV have also been reproduced successfully. The model incorporates a longitudinal as well as transverse hydrodynamic flow. The contributions from heavier decay resonances have also been taken into account.

    Comments:
    19 Pages, 13 Figures, 4 Tables. arXiv admin note: text overlap with arXiv:1402.6813 by other authors
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.04185 [pdf]
    12 citations
  2. 09

    [Submitted on 15 Feb 2015] (cross-list from nucl-ex)

    Low-energy electric dipole response in 120Sn

    A.M. Krumbholz🇩🇪 · P. von Neumann-Cosel🇩🇪 · T. Hashimoto🇯🇵 · A. Tamii🇯🇵 · T. Adachi🇯🇵 · C.A. Bertulani🇺🇸 · H. Fujita🇯🇵 · Y. Fujita🇯🇵 · E. Ganioglu🇹🇷 · K. Hatanaka🇯🇵 · C. Iwamoto🇯🇵 · T. Kawabata🇯🇵 and 20 other authors

    The electric dipole strength in 120Sn has been extracted from proton inelastic scattering experiments at E_p = 295 MeV and at forward angles including 0 degree. Below neutron threshoild it differs from the results of a 120Sn(gamma,gamma') experiment and peaks at an excitation energy of 8.3 MeV. The total strength corresponds to 2.3(2)% of the energy-weighted sum rule and is more than three times larger than what is observed with the (gamma,gamma') reaction. This implies a strong fragmentation of the E1 strength and/or small ground state branching ratios of the excited 1- states.

    Comments:
    7 pages, 6 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1502.04305 [pdf]
    PLB(2015)·72 citations
  3. 10

    [Submitted on 15 Feb 2015] (cross-list from nucl-ex)

    Detailed study of parton energy loss via measurement of fractional momentum loss of high hadrons in heavy ion collisions

    Takao Sakaguchi (for the PHENIX collaboration)🇺🇸

    PHENIX measurement of the fractional momentum loss () of high identified hadrons are presented. The of high pizero which are computed from 39GeV Au+Au over to 2.76TeV Pb+Pb are found to vary by a factor of six. We plotted the against several global variables, , and , and found global features. It was found that 200GeV Au+Au points are merging into the central 2.76TeV Pb+Pb points when plotting against .

    Comments:
    6 pages, 7 figure, proceedings for 10th International Workshop on High-pT Physics at RHIC/LHC era, held in Nantes, France, on Sep 9-12, 2014
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1502.04388 [pdf]
    J.Phys.Conf.Ser.(2017)·0 citations
  4. 11

    [Submitted on 16 Feb 2015] (cross-list from hep-ph)

    Magnetic Field Effect on Charmonium Production in High Energy Nuclear Collisions

    Xingyu Guo🇨🇳 · Shuzhe Shi🇨🇳 · Nu Xu🇺🇸 · Zhe Xu🇨🇳 · Pengfei Zhuang🇨🇳

    It is important to understand the strong external magnetic field generated at the very beginning of high energy nuclear collisions. We study the effect of the magnetic field on the charmonium yield and anisotropic distribution in Pb+Pb collisions at the LHC energy. The time dependent Schrödinger equation is employed to describe the motion of pairs. We compare our model prediction of non- collective anisotropic parameter of s with CMS data at high transverse momentum. This is the first attempt to measure the magnetic field in high energy nuclear collisions.

    Comments:
    5 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.04407 [pdf]
    PLB(2015)·90 citations
  5. 12

    [Submitted on 16 Feb 2015] (cross-list from hep-ph)

    Recent progress in hard-thermal-loop QCD thermodynamics and collective excitations

    Nan Su🇩🇪

    I review recent developments in QCD thermodynamics and collective excitations from the hard-thermal-loop effective theory. I begin by motivating the discussion with open questions from heavy-ion collisions. I then discuss a finite-temperature and -density calculation of QCD thermodynamics at NNLO from the hard-thermal-loop perturbation theory. Finally I discuss a recent exploration of generalizing the hard-thermal-loop framework to the (chromo)magnetic scale , from which a novel massless mode is uncovered.

    Comments:
    18 pages, 7 figures; Invited review for International Journal of Modern Physics A; v2, references updated and typos corrected, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1502.04589 [pdf]
    Int.J.Mod.Phys.A(2015)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE