Transport coefficients from energy loss studies in an expanding QGP
Por:
Ayala, Alejandro, Dominguez, Isabel, Jalilian-Marian, Jamal, Elena Tejeda-Yeomans, Maria
Publicada:
1 ago 2017
Categoría:
Nuclear and high energy physics
Resumen:
We use linear viscous hydrodynamics to describe the energy and momentum
deposited by a fast moving parton in a quark gluon plasma. This
energy-momentum is used to compute the probability density for the
production of soft partons by means of the Cooper-Frye formula. Using
this probability density, we render manifest a relation between the
average transverse momentum given to the fast moving parton from the
medium, (q) over cap, the shear viscosity to entropy density ratio,
eta/s, and the energy lost by the fast moving parton, Delta E, in an
expanding medium under similar conditions to those generated in
nucleus-nucleus collisions at the LHC and RHIC energies. We find that
(q) over cap increases with Delta E. On the other hand, eta/s is more
stable with Delta E. The behavior of (q) over cap, with Delta E is
understood as arising from the length of medium the parton traverses
from the point where it is produced. However, since eta/s is
proportional to the ratio of the length of medium traversed by the fast
parton and the average number of scatterings it experiences, it has a
milder dependence on the energy it loses. This study represents a tool
to obtain a direct connection between transport coefficients and the
description of in-medium energy loss within a linear viscous
hydrodynamical evolution of the bulk.
Filiaciones:
Ayala, Alejandro:
Univ Cape Town, Ctr Theoret & Math Phys, ZA-7700 Rondebosch, South Africa
Univ Cape Town, Dept Phys, ZA-7700 Rondebosch, South Africa
Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Apartado Postal 70-543, Mexico City 04510, DF, Mexico
Dominguez, Isabel:
Univ Autonoma Sinaloa, Fac Ciencias Fisicomatemat, Ave Amer & Blvd Univ,Ciudad Univ, Culiacan 80000, Sinaloa, Mexico
Jalilian-Marian, Jamal:
Baruch Coll, Dept Nat Sci, New York, NY 10010 USA
CUNY, Grad Ctr, 365 Fifth Ave, New York, NY 10016 USA
Elena Tejeda-Yeomans, Maria:
Univ Sonora, Dept Fis, Blvd Luis Encinas J & Rosales, Hermosillo 83000, Sonora, Mexico
|