Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-12-21
Phys.Rev.C51:2125-2134,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages (REVTeX), includes 2 uuencoded compressed postscript figures
Scientific paper
10.1103/PhysRevC.51.2125
In reactions with $q \bar q$ production or $q\bar q$ annihilation, initial- and final-state interactions give rise to large corrections to the lowest-order cross sections. We evaluate the correction factor first for low relative kinetic energies by studying the distortion of the relative wave function. We then follow the procedure of Schwinger to interpolate this result with the well-known perturbative QCD vertex correction factors at high energies, to obtain an explicit semi-empirical correction factor applicable to the whole range of energies. The correction factor predicts an enhancement for $q\bar q$ in color-singlet states and a suppression for color-octet states, the effect increasing as the relative velocity decreases. Consequences on dilepton production in the quark-gluon plasma, the Drell-Yan process, and heavy quark production processes are discussed.
Chatterjee Lali
Wong Cheuk-Yin
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