Pion-exchange and Fermi-motion effects on the proton-deuteron Drell-Yan process

作者：Kamano H^*; Lee T S H

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2012, 86(9): 094037.

DOI：10.1103/PhysRevD.86.094037

Within a nuclear model where the deuteron has NN and pi NN components, we derive a convolution formula for investigating the Drell-Yan process in proton-deuteron (pd) reactions. The contribution from the pi NN component is expressed in terms of a pion momentum distribution that depends sensitively on the pi NN form factor. With a pi NN form factor determined by fitting the pi N scattering data up to invariant mass W = 1.3 GeV, we find that the pion-exchange and nucleon Fermi-motion effects can change significantly the ratios between the proton-deuteron and proton-proton Drell-Yan cross sections, R-pd/pp = sigma(pd)/(2 sigma(pp)), in the region where the partons emitted from the target deuteron are in the Bjorken x(2) greater than or similar to 0.4 region. The calculated ratios R-pd/pp at 800 GeV agree with the available data. Predictions at 120 GeV for analyzing the forthcoming data from Fermilab are presented.

• 出版日期2012-11-26