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HEP/Astro Seminar -- Wednesday, 05 April 2000
Heavy Quark Production in Perturbative QCD
Abstract
The standard QCD parton formalism used by many global analyses and Monte Carlo
programs apply the zero-mass approximation to all "partons", including charm
and bottom quarks above their production thresholds. On the other hand, most
recent NLO heavy quark (say, Q) calculations treat M_Q as a large parameter and
always consider Q as a "heavy particle", never as a parton, even when the
energy scale of the physical process is much larger than M_Q. By their very
nature, these two contrasting approaches are both limited in their regions of
applicability. The dichotomy between the two can be resolved naturally in a
unified PQCD formalism with full M_Q dependence, at all energies. This picture
naturally reduces to the two conventional approaches in their respective region
of validity. Recent applications to lepto- and hadro-production of heavy quarks
are briefly summarized.
3:30pm, Smith Lab 4079