Energy loss of fast quarks in nuclei

Citation
Mb. Johnson et al., Energy loss of fast quarks in nuclei, PHYS REV L, 86(20), 2001, pp. 4483-4487
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
86
Issue
20
Year of publication
2001
Pages
4483 - 4487
Database
ISI
SICI code
0031-9007(20010514)86:20<4483:ELOFQI>2.0.ZU;2-M
Abstract
We report an analysis of the nuclear dependence of the yield of Drell-Yan d imuons from the 800 GeV/c proton bombardment of H-2, C, Ca, Fe, and W targe ts. 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 l oss and shadowing on the nuclear-dependence ratios versus the incident prot on'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 nucle ar environment.