https://doi.org/10.1140/epjc/s10052-009-0941-2
Regular Article - Theoretical Physics
A Monte Carlo model for ‘jet quenching’
1
Physics Department, Theory Unit, CERN, 1211, Genève 23, Switzerland
2
Physikalisches Institut, Universität Heidelberg, Philosophenweg 12, 69120, Heidelberg, Germany
3
High Energy Physics, Uppsala University, Box 535, 75121, Uppsala, Sweden
* e-mail: zapp@physi.uni-heidelberg.de
Received:
6
May
2008
Revised:
12
November
2008
Published online:
10
March
2009
We have developed the Monte Carlo simulation program Jewel 1.0 (Jet Evolution With Energy Loss), which interfaces a perturbative final-state parton shower with medium effects occurring in ultra-relativistic heavy-ion collisions. This is done by comparing for each jet fragment the probability of further perturbative splitting with the density-dependent probability of scattering with the medium. A simple hadronisation mechanism is included. In the absence of medium effects, we validate Jewel against a set of benchmark jet measurements. For elastic interactions with the medium, we characterise not only the medium-induced modification of the jet, but also the jet-induced modification of the medium. Our main physical result is the observation that collisional and radiative medium modifications lead to characteristic differences in the jet fragmentation pattern, which persist above a soft background cut. We argue that this should allow one to disentangle collisional and radiative parton energy loss mechanisms by measuring the n-jet fraction or a class of jet shape observables.
© Springer-Verlag, 2009