We consider the energy dependence of charm and beauty production cross-sections in pp or ppBAR collisions up to square-root s = 200 TeV for different values of the scale mu^2, using different proton structure functions. The cross-sections are computed accounting for leading-order and next-to-leading order perturbative QCD contributions. The values of K-factors increase significantly with the energy for relatively small scale values, mu^2 almost-equal-to m^2, where M is the heavy-quark mass, and do not practically depend on the energy for higher values, mu^2= 4M^2-8M^2. The calculated cross-sections as functions of the energy for different values of mu^2 have a common crossing point if the gluon structure functions used have proper Altarelli-Parisi mu^2 evolution. The same holds true when considering the energy and scale dependence of the heavy-quark cross-sections in high-energy photoproduction.
Energy and scale dependence of heavy-quark production in QCD
ANZIVINO, Giuseppina
1994
Abstract
We consider the energy dependence of charm and beauty production cross-sections in pp or ppBAR collisions up to square-root s = 200 TeV for different values of the scale mu^2, using different proton structure functions. The cross-sections are computed accounting for leading-order and next-to-leading order perturbative QCD contributions. The values of K-factors increase significantly with the energy for relatively small scale values, mu^2 almost-equal-to m^2, where M is the heavy-quark mass, and do not practically depend on the energy for higher values, mu^2= 4M^2-8M^2. The calculated cross-sections as functions of the energy for different values of mu^2 have a common crossing point if the gluon structure functions used have proper Altarelli-Parisi mu^2 evolution. The same holds true when considering the energy and scale dependence of the heavy-quark cross-sections in high-energy photoproduction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.