QCD coupling constant at NNLO from DIS data

Abstract

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 α_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.

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

References in corpus (10)

• The 2009 World Average of ${\alpha }_s$
• The 3-, 4-, and 5-flavor NNLO Parton from Deep-Inelastic-Scattering Data and at Hadron Colliders
• Update of Parton Distributions at NNLO
• Dynamical parton distributions of the nucleon and very small-x physics
• Strong-Coupling Constant with Flavor Thresholds at Five Loops in the MS-bar Scheme
• Small-x behavior of the structure function F_2 and its slope partial ln(F_2)/partial ln(1/x) for "frozen" and analytic strong-coupling constants
• Bjorken Sum Rule and pQCD frontier on the move
• Nucleon spin structure and pQCD frontier on the move
• Non-singlet QCD analysis of F_2(x,Q^2) up to NNLO
• Nonsinglet parton distribution functions from the precise next-to-next-to-next-to leading order QCD fit

Cited by in corpus (21)

• Parton distribution functions and benchmark cross sections at NNLO
• Analytic and "frozen" QCD coupling constants up to NNLO from DIS data
• Evolution of singlet structure functions from DGLAP equation at next-to-next-to-leading order at small-x
• Bjorken sum rule in QCD frameworks with analytic (holomorphic) coupling
• Transverse momentum dependent parton densities in processes with heavy quark generations
• Improved nonsinglet QCD analysis of the fixed-target DIS data
• Fractional Analytic QCD beyond Leading Order
• An Evaluation of The Proton Structure Functions $F_2$ and $F_L$ at Small $x$
• Non-perturbative momentum dependence of the coupling constant and hadronic models
• Fractional Analytic QCD beyond Leading Order in timelike region
• Transverse momentum dependent parton densities in a proton from the generalized DAS approach
• New type of parametrizations for parton distributions
• The behavior of the structure function by using the effective exponent at low-x
• Bjorken sum rule in QCD with analytic coupling
• Antishadowing in the rescaling model at x ~ 0.1
• Longitudinal structure function from the parton parameterization
• Evolution of the longitudinal structure function at small x
• The study of the gluon distribution function and reduced cross section behavior using the proton structure function
• Nonlinear corrections for the nuclear gluon distribution in $eA$ processes
• Small-x behavior of non-singlet spin structure function and Bjorken sum rule with pQCD correction up to NNLO and Higher twist correction
• The NNLO QCD analysis of gluon distribution function at small-x