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Nuclear Theory·nucl-th

Friday·June 26, 2015

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 25 Jun 2015]

    Impact of momentum-space anisotropy on heavy quark dynamics in a QGP medium

    Vinod Chandra🇮🇳 · Santosh K. Das🇮🇹

    Momentum space anisotropy present in the quark and gluon distribution functions in relativistic heavy ion collisions induces Chromo-Weibel instability in the hot QCD medium created therein. The impact of the Chromo-Weibel instability on the dynamics of a heavy-quark (HQ) traversing in the QGP medium is investigated within the framework of kinetic theory by studying the momentum and temperature behavior of HQ drag and diffusion coefficients. The physics of anisotropy is captured in an effective Vlasov term in the transport equation. The effects of the instability are handled by making a relation with the phenomenologically known jet quenching parameter in RHIC and LHC. Interestingly, the presence of instability significantly affect the temperature and momentum dependences of the HQ drag and diffusion coefficients. These results may have appreciable impact on the experimental observables such as, the nuclear suppression factor, , and the elliptic flow, , of heavy mesons in heavy ion collisions at RHIC and LHC energies which is a matter of future investigation.

    Comments:
    8 pages, two column, 8 figures, v3: Sec. III and IV revised, new figs added in Sec. IV
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1506.07805 [pdf]
    PRD(2016)·18 citations
  2. 02

    [Submitted on 25 Jun 2015] (cross-list from astro-ph.HE)

    Bayesian analysis for two-parameter hybrid EoS with high-mass compact star twins

    David E. Alvarez-Castillo🇷🇺 · Alexander Ayriyan🇷🇺 · David Blaschke🇷🇺 · Hovik Grigorian🇷🇺

    We perform a Bayesian analysis in the basis of a recently developed two-parameter class of hybrid equations of state that allow for high-mass compact star twins. While recently a wide range of radii, from 9 - 15 km, has been inferred for different neutron stars using different techniques, we perform our analysis under the supposition that the radii are towards the large end ( km). We use this radius constraint together with the undebated statistically independent constraint for high masses () as priors in selecting the most probable hybrid equations of state from a family with two free parameters: the baryon excluded volume in the hadronic phase and the 8-quark vector channel interaction in the quark matter phase.

    Comments:
    11 pages, 3 figures, Proceedings of the Conference "Compact Stars in the QCD Phase Diagram IV", September 26-30, 2014, Prerow, Germany
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1506.07755 [pdf]
    eConf C140926 (2015)·5 citations
  3. 03

    [Submitted on 25 Jun 2015] (cross-list from hep-ph)

    Thermalization of mini-jets in a quark-gluon plasma

    Edmond Iancu🇫🇷 · Bin Wu🇫🇷

    We complete the physical picture for the evolution of a high-energy jet propagating through a weakly-coupled quark-gluon plasma by investigating the thermalization of the soft components of the jet. We argue that the following scenario should hold: the leading particle emits a significant number of mini-jets which promptly evolve via quasi-democratic branchings and thus degrade into a myriad of soft gluons, with energies of the order of the medium temperature T. Via elastic collisions with the medium constituents, these soft gluons relax to local thermal equilibrium with the plasma over a time scale which is considerably shorter than the typical lifetime of the mini-jet. The thermalized gluons form a tail which lags behind the hard components of the jet. We support this scenario, first, via parametric arguments and, next, by studying a simplified kinetic equation, which describes the jet dynamics in longitudinal phase-space. We solve the kinetic equation using both (semi-)analytical and numerical methods. In particular, we obtain the first exact, analytic, solutions to the ultrarelativistic Fokker-Planck equation in one-dimensional phase-space. Our results confirm the physical picture aforementioned and demonstrate the quenching of the jet via multiple branching followed by the thermalization of the soft gluons in the cascades.

    Comments:
    14 figures, 42 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1506.07871 [pdf]
    JHEP(2015)·54 citations

Affiliations

first authorsco-authorsvia INSPIRE