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Nuclear Theory·nucl-th

Tuesday·July 11, 2017

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Are minimal conditions for collectivity met in e+e- collisions?

    J.L. Nagle🇺🇸 · R. Belmont🇺🇸 · K. Hill🇺🇸 · J. Orjuela Koop🇺🇸 · D.V. Perepelitsa🇺🇸 · P. Yin🇺🇸 · Z-W. Lin🇺🇸 · D. McGlinchey🇺🇸

    Signatures of collective behavior have been measured in highly relativistic p+p collisions, as well as in p+A, d+A, and 3He+A collisions. Numerous particle correlation measurements in these systems have been successfully described by calculations based on viscous hydrodynamic and transport models. These observations raise the question of the minimum necessary conditions for a system to exhibit collectivity. Recently, numerous scientists have raised the question of whether the quarks and gluons generated in e+e- collisions may satisfy these minimum conditions. In this paper we explore possible signatures of collectivity, or lack thereof, in e+e- collisions utilizing A Multi-Phase Transport (AMPT) framework which comprises melted color strings, parton scattering, hadronization, and hadron re-scattering.

    nucl-thnucl-exPRC(2018)·36 citations
  2. 02

    Rapidity dependence of proton cumulants and correlation functions

    Adam Bzdak🇵🇱 · Volker Koch🇺🇸

    The dependence of multi-proton correlation functions and cumulants on the acceptance in rapidity and transverse momentum is studied. We find that the preliminary data of various cumulant ratios are consistent, within errors, with rapidity and transverse momentum independent correlation functions. However, rapidity correlations which moderately increase with rapidity separation between protons are slightly favored. We propose to further explore the rapidity dependence of multi-particle correlation functions by measuring the dependence of the integrated reduced correlation functions as a function of the size of the rapidity window.

    nucl-thhep-exhep-phnucl-exPRC(2017)·37 citations
  3. 03

    Neutron stars in the large- limit

    Francesco Giacosa🇵🇱 · Giuseppe Pagliara🇮🇹

    We study the phase transition from dense baryonic matter to dense quark matter within the large- limit. By using simple constant speed of sound equations of state for the two phases, we derive the scaling with of the critical quark chemical potential for this phase transition. While quark matter is strongly suppressed at large , the phase transition at a large but finite density could nevertheless be important to determine the maximum mass of compact stars. In particular, in the range the quark phase would take place in compact stars and would lead to the formation of an unstable branch of hybrid stars. As a consequence, the maximum mass is restricted to the range . For larger value of , the phase transition would occur at densities too high to be reached in the core of compact stars. However, the very requirement that it occurs (although at a very large density) translates into interesting constraints on the stiffness of the baryonic phase: its speed of sound must exceed .

    nucl-thhep-phNPA(2017)·6 citations
  4. 04

    Chiral phase transition in linear sigma model with non-extensive statistical mechanics

    Ke-Ming Shen🇨🇳 · Hui Zhang🇨🇳 · De-Fu Hou🇨🇳 · Ben-Wei Zhang🇨🇳 · En-Ke Wang🇨🇳

    From the non-extensive statistical mechanics, we investigate the chiral phase transition at finite temperature and baryon chemical potential in the framework of the linear sigma model. The corresponding non-extensive distribution, based on Tsallis' statistics, is characterized by a dimensionless non-extensive parameter, , and the results in the usual Boltzmann-Gibbs case are recovered when . The thermodynamics of the linear sigma model and its correspodning phase diagram are analysed. At high temperature region, the critical temperature is shown to decrease with increasing from the phase diagram in the plane. However, larger values of causes the rise of at low temperature but high chemical potential. Moreover, it is found that different from zero corresponds to a first-order phase transition while to a crossover one. The critical endpoint (CEP) carries higher chemical potential but lower temperature with increasing due to the non-extensive effects.

    nucl-thAdv.High Energy Phys.(2017)·16 citations
  5. 05

    Light-nuclei spectra from chiral dynamics

    M. Piarulli · A. Baroni · L. Girlanda · A. Kievsky · A. Lovato · Ewing Lusk · L.E. Marcucci · Steven C. Pieper · R. Schiavilla · M. Viviani · R.B. Wiringa

    A major goal of nuclear theory is to explain the spectra and stability of nuclei in terms of effective many-body interactions amongst the nucleus' constituents-the nucleons, i.e., protons and neutrons. Such an approach, referred to below as the basic model of nuclear theory, is formulated in terms of point-like nucleons, which emerge as effective degrees of freedom, at sufficiently low energy, as a result of a decimation process, starting from the fundamental quarks and gluons, described by Quantum Chromodynamics (QCD). A systematic way to account for the constraints imposed by the symmetries of QCD, in particular chiral symmetry, is provided by chiral effective field theory, in the framework of a low-energy expansion. Here we show, in quantum Monte Carlo calculations accurate to of the binding energy, that two- and three-body chiral interactions fitted {\sl only} to bound- and scattering-state observables in, respectively, the two- and three-nucleon sectors, lead to predictions for the energy levels and level ordering of nuclei in the mass range =4-12 in very satisfactory agreement with experimental data. Our findings provide strong support for the fundamental assumptions of the basic model, and pave the way to its systematic application to the electroweak structure and response of these systems as well as to more complex nuclei.

    nucl-thnucl-exPRL(2018)·176 citations

Affiliations

first authorsco-authorsvia INSPIRE