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Paper   IPM / Physic / 8470
School of Physics
  Title:   QCD Analysis of Heavy Quarks Production in Hadronic Collisions
  Author(s): 
1.  A. Mirjalili
2.  A.N. Khorramian
3.  S. Atashbar Tehrani
  Status:   Published
  Journal: Nucl. Phys. B Proc. Suppl.
  Vol.:  167
  Year:  2007
  Pages:   34-37
  Supported by:  IPM
  Abstract:
The problem of renormalization scheme dependence in QCD perturbation theory remains on obstacle to mak- ing precise tests of the theory. The renormalization scale dependence of dimensionless physical QCD observable, depending on a single energy scale Q, can be avoided provided that all ultraviolet logarithms which build the physical energy dependence on Q are resummed. This was termed complete Renormalization Group improve- ment(CORGI). This argument can be extended to processes involving factorization of operator matrix elements and coefficient functions. We are trying to employ the idea of CORGI approach on analyzing of heavy quarks production in hadron collisions. There is a sizable and systematic discrepancy between experimental data on the bb production in pp, γp and γγ collisions and existing theoretical calculations within perturbative QCD. One suggested way to cope with this discrepancy is to employ the CORGI approach in which one should perform a resummation to all-orders of renormalization and factorization group -predictable terms at each order of pertur- bation theory. Then the scales dependence will be avoided and it is expected that the mentioned discrepancy is reduced signi�cantly.

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