Nuclear effects in the Drell-Yan process.

Conference · Tue Jan 01 04:00:00 EST 2002

DOI:https://doi.org/10.1063/1.1513697· OSTI ID:976141

Raufeisen, J ^[1]

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1. Jorg

In the target rest frame and at high energies, Drell-Yan (DY) dilepton production looks like bremsstrahlung of massive photons, rather than parton annihilation. The projectile quark is decomposed into a series of Fock states. Configurations with fixed transverse separations in impact parameter space are interaction eigenstates for p p scattering. The DY cross section can then be expressed in terms of the same color dipole cross section as DIS. We compare calculations in this dipole approach with E772 data and with next-to-leading order parton model calculations. This approach is especially suitable to describe nuclear effects, since it allows one to apply Glauber multiple scattering theory. We go beyond the Glauber eikonal approximation by taking into account transitions between states, which would be eigenstates for a proton target. We calculate nuclear shadowing at large Feynman-x{sub F} for DY in proton-nucleus collisions and compare to E772 data. Nuclear effects on the transverse momentum distribution are also investigated.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 976141
• Report Number(s): LA-UR-02-1823
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
BREMSSTRAHLUNG
COLOR
CROSS SECTIONS
DIPOLES
DISTRIBUTION
EIGENSTATES
EIKONAL APPROXIMATION
IMPACT PARAMETER
MULTIPLE SCATTERING
PHOTONS
PRODUCTION
PROJECTILES
PROTONS
QUARKS
SCATTERING
TARGETS
TRANSVERSE MOMENTUM