QCD coupling constant at NNLO from DIS data

Details QCD coupling constant at NNLO from DIS data QCD coupling constant at NNLO from DIS data

2009-12-23

arxiv.org/abs/0912.4672v2

Phys.Rev.D81:034008,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 6 figures, error in Eq.(8) corrected and Fig.1 changed accordingly, overall results kept intact

Scientific paper

10.1103/PhysRevD.81.034008

Deep inelastic scattering data on F2 structure function from various fixed-target experiments were analyzed in the non-singlet approximation with a next-to-next-to-leading-order accuracy. The study of high statistics deep inelastic scattering data provided by BCDMS, SLAC, NMC and BFP collaborations was carried out separately for the first one and the rest, followed by a combined analysis done as well. For the coupling constant the following value \alpha_s(M_Z^2) = 0.1167 +/- 0.0021 (total exp.error) +0.0056/-0.0036(theor) was found, which in this approximation turns out to be slightly less than that obtained at the next-to-leading-order, as was generally anticipated. Ditto the theoretical uncertainties reduced with respect to those obtained in the case of the next-to-leading-order analysis thus confirming earlier observations.

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