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arXiv · hep-ex/0109014

Energy loss of fast quarks in nuclei

J. M. Moss·G. T. Garvey·M. B. Johnson·M. J. Leitch·P. L. McGaughey·J. -C. Peng B. Z. Kopeliovich·I. K. Potashnikova
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Abstract

We report an analysis of the nuclear dependence of the yield of Drell-Yan (DY) dimuons from the 800 GeV/c proton bombardment of $^2H$, C, Ca, Fe, and W targets. A light-cone formulation of the DY process is employed in the rest frame of the nucleus. In this frame, for $x_2\ll x_1$, DY production appears as bremsstrahlung of a virtual photon followed by decay into dileptons. We treat the two sources of nuclear suppression, energy loss and shadowing, in a consistent formulation. Shadowing, involving no free parameters, is calculated within the light-cone dipole formalism. Initial-state energy loss, the only unknown in the problem, is determined from a fit to the nuclear-dependence ratio versus $x_1$. With the assumption of constant energy loss per unit path length, we find $-dE/dz = 2.32 \pm 0.52\pm 0.5$ GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in nuclear environment.

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J. M. Moss, G. T. Garvey, M. B. Johnson, M. J. Leitch, P. L. McGaughey, J. -C. Peng B. Z. Kopeliovich, I. K. Potashnikova. 2001-09-12. Energy loss of fast quarks in nuclei. https://doi.org/10.1063/1.1469994

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