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Nuclear Theory·nucl-th

Tuesday·July 5, 2016

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 07

    [Submitted on 2 Jul 2016] (cross-list from hep-ph)

    Towards laboratory detection of topological vortices in superfluid phases of QCD

    Arpan Das🇮🇳 · Shreyansh S. Dave🇮🇳 · Somnath De🇮🇳 · Ajit M. Srivastava🇮🇳

    Topological defects arise in a variety of systems, e.g. vortices in superfluid helium to cosmic strings in the early universe. There is an indirect evidence of neutron superfluid vortices from glitches in pulsars. One also expects that topological defects may arise in various high baryon density phases of quantum chromodynamics (QCD), e.g. superfluid topological vortices in the color flavor locked (CFL) phase. Though vastly different in energy/length scales, there are universal features, e.g. in the formation of all these defects. Utilizing this universality, we investigate the possibility of detecting these topological superfluid vortices in laboratory experiments, namely heavy-ion collisions. Using hydrodynamic simulations, we show that vortices can qualitatively affect the power spectrum of flow fluctuations. This can give unambiguous signal for superfluid transition resulting in vortices, allowing for check of defect formation theories in a relativistic quantum field theory system, and the detection of superfluid phases of QCD. Detection of nucleonic superfluid vortices in low energy heavy-ion collisions will give opportunity for laboratory controlled study of their properties, providing crucial inputs for the physics of pulsars.

    Comments:
    6 pages, 3 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Superconductivity (cond-mat.supr-con); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1607.00480 [pdf]
    Mod.Phys.Lett.A(2017)·5 citations
  2. 08

    [Submitted on 2 Jul 2016] (cross-list from hep-ph)

    Event patterns (particle scatter plots) extracted from charged particle spectra in and Pb-Pb collisions at 2.76 TeV

    Ya-Hui Chen🇨🇳 · Fu-Hu Liu🇨🇳 · Sakina Fakhraddin🇸🇦 · Magda A. Rahim🇸🇦 · Mai-Ying Duan🇨🇳

    The transverse momentum () and pseudorapidity () spectra of charged particles produced in proton-proton () and lead-lead (Pb-Pb) collisions at the large hadron collider (LHC) are described by a hybrid model. In the model, the spectrum is described by a two-component distribution which contains an inverse power-law suggested by the QCD (Quantum Chromodynamic) calculus and an Erlang distribution resulted from a multisource thermal model. The spectrum is described by a Gaussian rapidity () distribution resulted from the Landau hydrodynamic model and the two-component distribution, where the conversion between and is accurately considered. The modelling results are in agreement with the experimental data measured by the ATLAS Collaboration in collisions at center-of-mass energy TeV and in Pb-Pb collisions at center-of-mass energy per nucleon pair TeV. Based on the parameter values extracted from and or spectra, the event patterns or particle scatter plots in three-dimensional velocity and momentum spaces are obtained.

    Comments:
    26 pages, 11 figures. Journal of Physics G, accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1607.00488 [pdf]
    J.Phys.G(2017)·5 citations
  3. 09

    [Submitted on 3 Jul 2016] (cross-list from hep-ph)

    Single inclusive hadron production in pA collisions at NLO

    B. Ducloué🇫🇮 · T. Lappi🇫🇮 · Y. Zhu🇫🇮

    We study single inclusive forward hadron production in high energy proton-nucleus collisions at next-to-leading order in the Color Glass Condensate framework. Recent studies have shown that the next-to-leading order corrections to this process are large and negative at large transverse momentum, leading to negative cross sections. We propose to overcome this difficulty by introducing an explicit rapidity factorization scale when subtracting the rapidity divergence into the evolution of the target.

    Comments:
    6 pages, 2 figures. Proceedings of DIS 2016, 11-15 April 2016, DESY Hamburg, Germany
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1607.00602 [pdf]
    PoS(2016)·0 citations
  4. 10

    [Submitted on 3 Jul 2016] (cross-list from hep-ph)

    Forward production in pA collisions: centrality dependence

    B. Ducloué🇫🇮 · T. Lappi🇫🇮 · H. Mäntysaari🇺🇸

    The nuclear suppression of forward production in high energy proton-nucleus collisions can be used as a probe of gluon saturation at small . In an earlier work we studied this suppression in minimum bias collisions in the Color Glass Condensate formalism, relying on the optical Glauber model to obtain the dipole cross section of the nucleus from the one of the proton fitted to HERA DIS data. Here we study how the impact parameter dependence of this model can be used to compare our results with recent LHC data on the centrality dependence of this suppression.

    Comments:
    6 pages, 1 figure. Proceedings of DIS 2016, 11-15 April 2016, DESY Hamburg, Germany
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1607.00603 [pdf]
    PoS(2016)·0 citations
  5. 11

    [Submitted on 3 Jul 2016] (cross-list from hep-ph)

    Excitation functions of parameters extracted from three-source (net-)proton rapidity distributions in Au-Au and Pb-Pb collisions over an energy range from AGS to RHIC

    Li-Na Gao🇨🇳 · Fu-Hu Liu🇨🇳 · Yan Sun🇨🇳 · Zhu Sun🇨🇳 · Roy A. Lacey🇺🇸

    Experimental results of the rapidity spectra of protons and net-protons (protons minus antiprotons) emitted in gold-gold (Au-Au) and lead-lead (Pb-Pb) collisions, measured by a few collaborations at the alternating gradient synchrotron (AGS), super proton synchrotron (SPS), and relativistic heavy ion collider (RHIC), are described by a three-source distribution. The values of the distribution width and contribution ratio (relative contribution) of the central rapidity region, and the distribution width and rapidity shift of the forward/backward rapidity regions, are then obtained. The excitation function of increases generally with increase of the center-of-mass energy per nucleon pair . The excitation function of shows a saturation at GeV. The excitation function of shows a minimum at GeV and a saturation at GeV. The excitation function of increase monotonously with in the considered energy range.

    Comments:
    19 pages, 8 figures, The European Physical Journal A, accepted
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1607.00611 [pdf]
    EPJA(2017)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE