Energy Loss of a Heavy Quark Produced in a Finite Size Medium

Details Energy Loss of a Heavy Quark Produced in a Finite Size Medium Energy Loss of a Heavy Quark Produced in a Finite Size Medium

2006-08-04

arxiv.org/abs/hep-ph/0608061v2

JHEP 0704:012,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 3 figures. New version clarified and simplified. A critical discussion added in section 2, and previous sections 3 a

Scientific paper

10.1088/1126-6708/2007/04/012

We study the medium-induced energy loss $-\Delta E_0(L_p)$ suffered by a heavy quark produced at initial time in a quark-gluon plasma, and escaping the plasma after travelling the distance $L_p$. The heavy quark is treated classically, and within the same framework $-\Delta E_0(L_p)$ consistently includes: the loss from standard collisional processes, initial bremsstrahlung due to the sudden acceleration of the quark, and transition radiation. The radiative loss {\it induced by rescatterings} $-\Delta E_{rad}(L_p)$ is not included in our study. For a ultrarelativistic heavy quark with momentum $p \gsim 10 {\rm GeV}$, and for a finite plasma with $L_p \lsim 5 {\rm fm}$, the loss $-\Delta E_0(L_p)$ is strongly suppressed compared to the stationary collisional contribution $-\Delta E_{coll}(L_p) \propto L_p$. Our results support that $-\Delta E_{rad}$ is the dominant contribution to the heavy quark energy loss (at least for $L_p \lsim 5 {\rm fm}$), as indeed assumed in most of jet-quenching analyses. However they might raise some question concerning the RHIC data on large $p_{\perp}$ electron spectra.

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