Energy loss of fast quarks in nuclei |
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| Authors: | Johnson M B,Kopeliovich B Z,Potashnikova I K,McGaughey P L,Moss J M,Peng J C,Garvey G T,Leitch M J,Adams M R,Alde D M,Baer H W,Barlett M L,Brown C N,Cooper W E,Carey T A,Danner G,Hoffmann G W,Hsiung Y B,Kaplan D M,Klein A,Lee C,Lillberg J W,McCarthy R L,Mishra C S,Wang M J FNAL E Collaboration |
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| Affiliation: | Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. |
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| 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. |
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