Baryon deceleration and partonic plasma creation by strong chromofields in ultrarelativistic heavy-ion collisions |
| |
Authors: | I N Mishustin K A Lyakhov |
| |
Institution: | 1.Frankfurt Institute for Advanced Studies,Frankfurt am Main,Germany;2.National Research Center “Kurchatov Institute”,Moscow,Russia;3.Frankfurt International Graduate School for Science,Frankfurt am Main,Germany |
| |
Abstract: | Strong chromofields generated at early stages of ultrarelativistic nuclear collisions may explain not only creation of the
quark-gluon plasma but also collective deceleration of net baryons. This is demonstrated by solving classical equations of
motion for baryonic slabs under the action of a time-dependent chromofield. We have studied sensitivity of the slab trajectories
and their final rapidities to the initial strength and decay time of the chromofield, as well as to the back reaction of the
produced plasma. By proper choice of the initial chromofield energy density we can reproduce significant baryon stopping,
an average rapidity loss of about two units, observed for Au + Au collisions at RHIC. Using a Bjorken-like hydrodynamical
model with the particle production source, we also study the evolution of partonic plasma produced as the result of the chromofield
decay. Due to the delayed formation and expansion of plasma its maximum energy density is significantly lower than the initial
energy density of the chromofield. It is shown that the fluctuations of the chromofield due to the stochastic distribution
of color charges help to populate the midrapidity region in the net-baryon distribution. To fit the midrapidity data we need
the chromofields with initial energy densities in the range of 30 to 60 GeV/fm3. Predictions of baryon stopping for Pb + Pb collisions at LHC energies are made. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|