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Nuclear Theory·nucl-th

Tuesday·August 29, 2017

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    Effect of two loop correction in the formation of QGP droplet

    S. Somorendro Singh🇮🇳

    The effect of two loop correction in the formation of quark-gluon plasma (QGP) droplet is studied with the introduction of the two loop correction factor in the mean field potential. Due to the correction factor it shows stability in the droplet formation of QGP indicating at different parametrization factors of the QGP fluid. The correction factor in the potential also shows gluon parameter factor shifts to a larger value from its earlier value of gluon factor of one loop correction in obtaining the stable droplets. The results show decreasing in the observable QGP droplets and droplet sizes are found to be fm radii with the two loop correction. It indicates that there is parameter like Reynold's number which can control the dynamics of QGP droplet formation and the stability of droplet in the case of droplet formation with the two loop correction factor.

    ↳ hep-phnucl-th0 citations
  2. 08

    Collectivity from interference

    Boris Blok🇮🇱 · Christian D. Jäkel🇧🇷 · Mark Strikman🇺🇸 · Urs Achim Wiedemann🇨🇭

    In hadronic collisions, interference between different production channels affects momentum distributions of multi-particle final states. As this QCD interference does not depend on the strong coupling constant, it is part of the no-interaction baseline that needs to be controlled prior to searching for other manifestations of collective dynamics. Here, we introduce a model that is based on the QCD theory of multi-parton interactions and that allows one to study interference effects in the production of particles in hadronic collisions with parton-parton interactions ("sources"). In an expansion in powers of and to leading order in the number of sources , we calculate interference effects in the -particle spectra and we determine from them the second and fourth order cumulant momentum anisotropies . Without invoking any azimuthal asymmetry and any density dependent non-linear dynamics in the incoming state, and without invoking any interaction in the final state, we find that QCD interference alone can give rise to values for and , even, that persist unattenuated for increasing number of sources, that may increase with increasing multiplicity and that agree with measurements in proton-proton (pp) collisions in terms of the order of magnitude of the signal and the approximate shape of the transverse momentum dependence. We further find that the non-abelian features of QCD interference can give rise to odd harmonic anisotropies. These findings indicate that the no-interaction baseline including QCD interference effects can make a sizeable if not dominant contribution to the measured coefficients in pp collisions. Prospects for analyzing QCD interference contributions further and their possible relevance for proton-nucleus and nucleus-nucleus collisions are discussed shortly.

    ↳ hep-phhep-exnucl-exnucl-thJHEP(2017)·56 citations
  3. 09

    Tabulated Neutron Star Equations of State Modeled within the Chiral Mean Field Model

    V. Dexheimer🇺🇸

    In this special issue article, I review some of the accomplishments of the chiral mean field (CMF) model, which contains nucleon, hyperon, and quark degrees of freedom, and its applications to proto-neutron and neutron stars. I also present a set of equation of state and particle population tables built using the CMF model subject to physical constraints necessary to reproduce different environments, such as those present in cold neutron stars, core-collapse supernova explosions and different stages of compact star mergers.

    ↳ astro-ph.HEastro-ph.SRnucl-thPubl.Astron.Soc.Austral.(2017)·26 citations
  4. 10

    Observables for possible QGP signatures in central pp collisions

    Michelangelo L. Mangano🇨🇭 · Benjamin Nachman🇺🇸

    Proton-proton (pp) data show collective effects, such as long-range azimuthal correlations and strangeness enhancement, which are similar to phenomenology observed in heavy ion collisions. Using simulations with and without explicit existing models of collective effects, we explore new ways to probe pp collisions at high multiplicity, in order to suggest measurements that could help identify the similarities and differences between large- and small-scale collective effects. In particular, we focus on the properties of jets produced in ultra-central pp collisions in association with a Z boson. We consider observables such as jet energy loss and jet shapes, which could point to the possible existence of an underlying quark-gluon plasma, or other new dynamical effects related to the presence of large hadronic densities.

    ↳ hep-phhep-exnucl-exnucl-thEPJC(2018)·30 citations

Affiliations

first authorsco-authorsvia INSPIRE