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| Paper IPM / Physic / 7928 |
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There is a sizable and systematic discrepancy between experimental data on the b―b production in p―p, γp and γγ collisions and the existing theoretical calculations within perturbative QCD. The uncertainty is coming from renormalization and factorization scale dependence of finite order perturbative calculations of the total cross section of b―b production in such collisions and will be discussed for p―p collision in detail. If we employ the approach of "Complete RG-improvement(CORGI)", in which one should perform a resummation to all-orders of renormalization and factorization group-predictable terms at each order of perturbation theory, then the scales dependence will be avoided and the mentioned discrepency is reduced significantly.
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