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24 April 2024

» pubmed » pmid11384264

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Energy loss of fast quarks in nuclei
M B Johnson ; B Z Kopeliovich ; I K Potashnikova ; P L McGaughey ; J M Moss ; J C Peng ; G T Garvey ; M J Leitch ; M R Adams ; D M Alde ; H W Baer ; M L Barlett ; C N Brown ; W E Cooper ; T A Carey ; G Danner ; G W Hoffmann ; Y B Hsiung ; D M Kaplan ; A Klein ; C Lee ; J W Lillberg ; R L McCarthy ; C S Mishra ; M J Wang ; ;
Date:	14 May 2001
Journal:	Phys Rev Lett, 86 (20), 4483-7
Abstract:	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+/-0.52+/-0.5 GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in a nuclear environment.
Source:	PubMed, pmid11384264
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