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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
; | | Date: |
12 Sep 2001 | | Subject: | hep-ex | | 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 $x_2ll x_1$, 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 $-dE/dz = 2.32 pm 0.52pm 0.5$ GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in nuclear environment. | | Source: | arXiv, hep-ex/0109014 | | Services: | Forum | Review | PDF | Favorites | |
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