Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross matic range of photon virtuality 2.5 ≤ Q2 ≤ 2000 GeV2 and Bjorken scaling variable 3 · 10−5 ≤ x ≤ 5 · 10−2. The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influ- ence of different heavy flavour schemes on the parton dis- tribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W ± and Z produc- tion cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.
Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA
DE PASQUALE, Salvatore;
2013-01-01
Abstract
Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross matic range of photon virtuality 2.5 ≤ Q2 ≤ 2000 GeV2 and Bjorken scaling variable 3 · 10−5 ≤ x ≤ 5 · 10−2. The combination method accounts for the correlations of the systematic uncertainties among the different data sets. The combined charm data together with the combined inclusive deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influ- ence of different heavy flavour schemes on the parton dis- tribution functions. The optimal values of the charm mass as a parameter in these different schemes are obtained. The implications on the NLO predictions for W ± and Z produc- tion cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
