A Systematic Study of QCD Coupling Constant from Deep-Inelastic Measurements
- Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 (Russian Federation)
We reanalyze deep-inelastic scattering data of the BCDMS Collaboration by including proper cuts of ranges with large systematic errors. We also perform the fits of high-statistic deep-inelastic scattering data of the BCDMS, SLAC, NM, and BFP Collaborations taking the data separately and in a combined way and find good agreement between these analyses. We extract the values of both the QCD coupling constant {alpha}{sub s}(M{sup 2}{sub Z}) up to the NLO level and of the power corrections to the structure function F{sub 2}. The fits of the combined data for the nonsinglet part of the structure function F{sub 2} predict the coupling constant value {alpha}{sub s}(M{sup 2}{sub Z}) = 0.1174 {+-} 0.0007 (stat.) {+-} 0.0019 (syst.) {+-} 0.0010 (norm.) (or QCD parameter {lambda}{sup (5)}{sub MS} = 204 {+-} 25 (total experimental error) MeV). The fits of the combined data for both the nonsinglet part and the singlet part lead to the values {alpha}{sub s}(M{sup 2}{sub Z}) = 0.1177 {+-} 0.0007 (stat.) {+-} 0.0021 (syst.) {+-} 0.0009 (norm.) (or QCD parameter {lambda}{sup (5)}{sub MS} = (208 {+-} 27 (total experimental error) MeV). The above values are in very good agreement with each other. We estimate theoretical uncertainties for {alpha}{sub s}(M{sup 2}{sub Z}) at +0.0047 and -0.0057 from fits of the combined data when complete singlet and nonsinglet Q{sup 2} evolution is taken into account.
- OSTI ID:
- 20692908
- Journal Information:
- Physics of Atomic Nuclei, Vol. 68, Issue 11; Other Information: Translated from Yadernaya Fizika, ISSN 0044-0027, 68, 1935-1965 (No. 11, 2005); DOI: 10.1134/1.2131117; (c) 2005 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); TN:; ISSN 1063-7788
- Country of Publication:
- United States
- Language:
- English
Similar Records
A study of energy-energy correlations and measurement of [alpha][sub s] at the Z[sup 0] resonance
QCD analysis of deep inelastic lepton-nucleon scattering data