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Collisional Energy Loss of a Fast Parton in a QGP · Around

2008

Collisional Energy Loss of a Fast Parton in a QGP

Peigne, Stephane

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The suppression of hadron p_T spectra in high energy central heavy-ion collisions compared to proton-proton collisions, referred to as 'jet-quenching', is currently attributed to partonic energy loss in the hot medium created in the collision.

The RHIC experiments show that at large enough p_T, hadron quenching is strong, and of similar magnitude for light and heavy flavours.
This point is difficult to understand in a parton energy loss scenario, where the energy loss is believed to be dominantly radiative, and quantitatively different for light partons and heavy quarks: gluon radiation off a heavy quark is suppressed at small angles - within the so-called dead cone - and a heavy quark suffers less radiative energy loss than a light parton.
In this context it is important to reconsider the collisional contribution to partonic energy loss.

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See the PHENIX Data Plot id p0883 b → e / ( c → e + b → e ) b\to e/(c\to e+b\to e) vs electron pt, RUN 5& 6, p+p, 200GeV, http://www.phenix.bnl.gov/WWW/plots/show_plot.php?editkey=p0883

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S. Peigné and A. Peshier, arXiv:0802.4364 [hep-ph]

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