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Nuclear Theory·nucl-th

Wednesday·January 7, 2015

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 05

    [Submitted on 5 Jan 2015] (cross-list from hep-ph)

    A non-abelian quasi-particle model for gluon plasma

    E.P. Politis🇬🇷 · C.E. Tsagkarakis🇬🇷 · F.K. Diakonos🇬🇷 · X.N. Maintas🇬🇷 · A. Tsapalis🇬🇷

    We propose a quasi-particle model for the thermodynamic description of the gluon plasma which takes into account non-abelian characteristics of the gluonic field. This is accomplished utilizing massive non-linear plane wave solutions of the classical equations of motion with a variable mass parameter, reflecting the scale invariance of the Yang-Mills Lagrangian. For the statistical description of the gluon plasma we interpret these non-linear waves as quasi-particles with a temperature dependent mass distribution. Quasi-Gaussian distributions with a common variance but different temperature dependent mean masses for the longitudinal and transverse modes are employed. We use recent Lattice results to fix the mean transverse and longitudinal masses while the variance is fitted to the equation of state of pure on the Lattice. Thus, our model succeeds to obtain both a consistent description of the gluon plasma energy density as well as a correct behaviour of the mass parameters near the critical point.

    Comments:
    7 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1501.01032 [pdf]
    PLB(2016)·5 citations
  2. 06

    [Submitted on 6 Jan 2015] (cross-list from hep-ph)

    Energy Dependent Growth of Nucleon and Inclusive Charged Hadron Distributions

    Hongmin Wang · Zhao-Yu Hou🇨🇳 · Xian-Jing Sun🇨🇳

    In the Color Glass Condensate formalism, charged hadron p_{T} distributions in p+p collisions are studied by considering an energy-dependent broadening of nucleon's density distribution. Then, in the Glasma flux tube picture, the n-particle multiplicity distributions at different pseudo-rapidity ranges are investigated. Both of the theoretical results show good agreement with the recent experimental data from ALICE and CMS at \sqrt{s}=0.9, 2.36, 7 TeV. The predictive results for p_{T} and multiplicity distributions in p+p and p+Pb collisions at the Large Hadron Collider are also given in this paper.

    Comments:
    11 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); math.GM (math.GM); Nuclear Theory (nucl-th)
    arXiv:
    1501.01102 [pdf]
    CPC(2015)·0 citations
  3. 07

    [Submitted on 6 Jan 2015] (cross-list from nucl-ex)

    Nuclear structure studies of F

    L. Caceres (GANIL)🇫🇷 · A. Lepailleur (GANIL)🇫🇷 · O. Sorlin (GANIL)🇫🇷 · M. Stanoiu (GANIL)🇫🇷 · D. Sohler🇭🇺 · Zs. Dombradi🇭🇺 · S. K. Bogner🇺🇸 · B.A. Brown · H. Hergert · J.D. Holt · A. Schwenk · F. Azaiez (IPNO)🇫🇷 and 30 other authors

    The structure of the F nucleus has been studied at GANIL using the decay of O and the in-beam -ray spectroscopy from the fragmentation of projectile nuclei. Combining these complementary experimental techniques, the level scheme of F has been constructed up to 3.6 Mev by means of particle- and particle- coincidence relations. Experimental results are compared to shell-model calculations using the standard USDA and USDB interactions as well as ab-initio valence-space Hamiltonians calculated from the in-medium similarity renormalization group based on chiral two- and three-nucleon forces. Both methods reproduce the measured level spacings well, and this close agreement allows unidentified spins and parities to be consistently assigned.

    Comments:
    5 figures, 2 tables
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1501.01166 [pdf]
    PRC(2015)·21 citations
  4. 08

    [Submitted on 6 Jan 2015] (cross-list from nucl-ex)

    The RHIC SPIN Program: Achievements and Future Opportunities

    Elke-Caroline Aschenauer (BNL)🇺🇸 · Alexander Bazilevsky (BNL)🇺🇸 · Markus Diehl (DESY)🇩🇪 · James Drachenberg (Valparaiso U.) · Kjeld Oleg Eyser (BNL)🇺🇸 · Renee Fatemi (Kentucky U.)🇺🇸 · Carl Gagliardi (Texas A&M)🇺🇸 · Zhongbo Kang (Los Alamos)🇺🇸 · Yuri V. Kovchegov (Ohio State U.)🇺🇸 · John Lajoie (Iowa State U.)🇺🇸 · Jeong-Hun Lee (BNL) · Emanuele-R. Nocera (Milano U. & INFN)🇮🇹 and 12 other authors

    Time and again, spin has been a key element in the exploration of fundamental physics. Spin-dependent observables have often revealed deficits in the assumed theoretical framework and have led to novel developments and concepts. Spin is exploited in many parity-violating experiments searching for physics beyond the Standard Model or studying the nature of nucleon-nucleon forces. The RHIC spin program plays a special role in this grand scheme: it uses spin to study how a complex many-body system such as the proton arises from the dynamics of QCD. Many exciting results from RHIC spin have emerged to date, most of them from RHIC running after the 2007 Long Range Plan. In this document we present highlights from the RHIC program to date and lay out the roadmap for the significant advances that are possible with future RHIC running.

    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1501.01220 [pdf]
    144 citations

Affiliations

first authorsco-authorsvia INSPIRE