The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e+ and e- beams, together with differential cross-section data on inclusive jet production in e+ p scattering and dijet production in gamma p scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. The input of jet-production data constrains the gluon and allows an accurate extraction of alpha_s(M_Z) at NLO; alpha _{s} = 0.1183 +- 0.0028(stat)+- 0.0008(model). An additional uncertainty from the choice of scales is estimated as +- 0.005 . This is the first extraction of alpha_s(M_Z) from HERA data alone.
An NLO QCD analysis of inclusive cross-section and jet-production data from the ZEUS experiment
COSTA, Marco;FERRERO, Maria Italia;MONACO, Vincenzo;SACCHI, Roberto;SOLANO, Ada Maria;
2005-01-01
Abstract
The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e+ and e- beams, together with differential cross-section data on inclusive jet production in e+ p scattering and dijet production in gamma p scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. The input of jet-production data constrains the gluon and allows an accurate extraction of alpha_s(M_Z) at NLO; alpha _{s} = 0.1183 +- 0.0028(stat)+- 0.0008(model). An additional uncertainty from the choice of scales is estimated as +- 0.005 . This is the first extraction of alpha_s(M_Z) from HERA data alone.File | Dimensione | Formato | |
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