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Paper   IPM / Physic / 7928
School of Physics
  Title:   Investigating the QCD Scale Dependence of Total Cross Section for Heavy Quark Production in pp Collisions
1.  A. Mirjalili
2.  A.N. Khorramian
3.  S. Atashbar Tehrani
  Status:   In Proceedings
  Proceeding: Proceedings of XI Regional Conference on Mathematical Physics, 3-6 May 2004, 69-71, Tehran, Iran
  Year:  2004
  Supported by:  IPM
There is a sizable and systematic discrepancy between experimental data on the bb production in pp, 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 bb production in such collisions and will be discussed for pp 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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