Energy loss of fast quarks in nuclei

Details Energy loss of fast quarks in nuclei Energy loss of fast quarks in nuclei

2000-10-19

arxiv.org/abs/hep-ex/0010051v1

Phys.Rev.Lett. 86 (2001) 4483-4487

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, including 4 figures

Scientific paper

10.1103/PhysRevLett.86.4483

We report an analysis of the nuclear dependence of the yield of Drell-Yan dimuons from the 800 GeV/c proton bombardment of $^2H$, C, Ca, Fe, and W targets. Employing a new formulation of the Drell-Yan process in the rest frame of the nucleus, this analysis examines the effect of initial-state energy loss and shadowing on the nuclear-dependence ratios versus the incident proton's momentum fraction and dimuon effective mass. The resulting energy loss per unit path length is $-dE/dz = 2.32 \pm 0.52\pm 0.5$ GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in nuclear environment.

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