Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-21
JHEP 0303:042,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, JHEP macro attached, 11 eps figures
Scientific paper
10.1088/1126-6708/2003/03/042
There a sizable and systematic discrepancy between experimental data on the $\bar{b}b$ production in $\bar{\mathrm p}$p, $\gamma$p and $\gamma\gamma$ collisions and existing theoretical calculations within perturbative QCD. Before interpreting this discrepancy as a signal of new physics, it is important to understand quantitatively the ambiguities of conventional calculations. In this paper the uncertainty coming from renormalization and factorization scale dependence of finite order perturbation calculations of the total cross section of $\bar{b}b$ production in $\bar{\mathrm{p}}$p collisions is discussed in detail. It is shown that the mentioned discrepancy is reduced significantly if these scales are fixed via the Principle of Minimal Sensitivity.
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