Towards understanding bb-bar production in {gamma}{gamma} collisions
- Center for Particle Physics, Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Prague 8 (Czech Republic)
The data on the total cross section {sigma}{sub tot}(e{sup +}e{sup -}{yields}e{sup +}e{sup -}bb-bar) measured at LEP2 represent a serious challenge for perturbative QCD. In order to understand the origin of the excess of data over QCD calculations, we investigate the dependence of the four contributions to this cross section on {gamma}{gamma} collision energy. As the reliability of the existing calculations of {sigma}{sub tot}(e{sup +}e{sup -}{yields}e{sup +}e{sup -}bb-bar) depends, among other things, on the stability of the calculations of the cross section {sigma}{sub tot}({gamma}{gamma}{yields}bb-bar) with respect to variations of the renormalization and factorization scales, we investigate this aspect in detail. We show that in most of the region relevant for the LEP2 data the existing QCD calculations of the cross section {sigma}{sub tot}({gamma}{gamma}{yields}bb-bar) do not exhibit a region of local stability. A possible source of this instability is suggested.
- OSTI ID:
- 20705123
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 70, Issue 5; Other Information: DOI: 10.1103/PhysRevD.70.054001; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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