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Nuclear Theory·nucl-th

Friday·July 20, 2018

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    Penetrating probes: Jets and photons in a non-equilibrium quark-gluon plasma

    Sigtryggur Hauksson🇨🇦 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    We employ new field-theoretical tools to study photons and jets in a non-equilibrium quark-gluon plasma. Jet broadening and photon emission takes place through radiation which is suppressed by repeated and coherent interaction with the medium. We analyze this physics in an anisotropic plasma such as is created in the early stages of heavy-ion collisions. The anisotropy introduces an angular dependence in radiation and reduces its overall rate. This can affect phenomenological predictions of the rapidity dependence and angular flow of jets and photons.

    nucl-thhep-phNPA(2019)·3 citations
  2. 02

    Small system studies: A theory overview

    Michael Strickland🇺🇸

    There is now a substantial body of evidence that a deconfined quark-gluon plasma is created in ultrarelativistic collisions of heavy nuclei. Some key observables which are used to gauge the production of the quark-gluon plasma are the hadronic spectra and multiplicities across many species, azimuthal anisotropies in the production of various hadrons, jet quenching, photon/dilepton production, and heavy quarkonium suppression. A key question in the study of the quark-gluon plasma is what happens to these observables as one changes the system size. In particular, it is very interesting to study collisions of `small systems' such as pp, dA, pA, and since naively one does not expect to produce a QGP in these cases. One of the surprises from such studies was the existence of sizable azimuthal anisotropies in the hadron spectra in the highest multiplicity classes, which led to speculations that one can generate a QGP in such relatively rare events. This interpretation, however, is complicated by the fact that there can be multiple sources of azimuthal anisotropy. I will discuss our current understanding of the different sources of azimuthal anisotropies and the multiplicity windows in which each mechanism is expected to dominate. I will also provide a critical discussion of the reliability of hydrodynamic models applied to small systems. Finally, I will briefly discuss jet quenching and heavy quarkonium suppression in small systems and discuss whether or not these observables show any indication of the production of a small QGP droplet.

    nucl-thhep-phNPA(2019)·40 citations
  3. 03

    Radiative pion capture in 2H, 3He and 3H

    J.Golak · R.Skibinski · K. Topolnicki · H. Witala · A.Grassi · H.Kamada · A.Nogga · L.E.Marcucci

    The , , , and capture reactions are studied with the AV18 two-nucleon potential and the Urbana~IX three-nucleon potential. We provide for the first time realistic predictions for the differential and total capture rates for all these processes, treating consistently the initial and final nuclear states. Our results are based on the single nucleon Kroll-Ruderman-type transition operator and concentrate on the full treatment of the nuclear final state interactions. They are compared with older theoretical predictions and experimental data.

    nucl-thPRC(2018)·10 citations
  4. 04

    Reliable extraction of the for Be from its breakup at 520 MeV/nucleon

    Laura Moschini🇧🇪 · Pierre Capel🇩🇪

    We analyze the breakup of the one-neutron halo nucleus Be measured at 520 MeV/nucleon at GSI on Pb and C targets within an eikonal description of the reaction including a proper treatment of special relativity. The Coulomb term of the projectile-target interaction is corrected at first order, while its nuclear part is described at the optical limit approximation. Excellent agreement with the data is obtained using a description of Be, which fits the breakup data of RIKEN. This solves the apparent discrepancy between the estimations from GSI and RIKEN for this nucleus.

    nucl-thPLB(2019)·32 citations

Affiliations

first authorsco-authorsvia INSPIRE