Apr 16 – 20, 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

Combination and QCD analysis of beauty and charm production cross section measurements in deep inelastic ep scattering at HERA

Apr 18, 2018, 2:00 PM


WG1: Structure Functions and Parton Densities WG1-WG5 Joint Session


Achim Geiser (Deutsches Elektronen-Synchrotron (DE))


Measurements of open beauty and charm production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections for beauty and charm production are obtained in the kinematic range of photon virtuality $2.5\le Q^2 \le 2000$ GeV$^2$ and Bjorken scaling variable $3 \times 10^{−5}\le x_{Bj} \le 5 \times 10^{−2}$. The combination method accounts for the correlations of the statistical and systematic uncertainties among the different data sets. The combined data are compared to perturbative QCD predictions and used together with the combined inclusive deep inelastic scattering cross sections from HERA in a next-to-leading order QCD analysis. The running charm and beauty quark masses are determined as $m_c(m_c) = 1.290^{+0.046}_{−0.041}$(exp/fit)${}^{+0.062}_{−0.014}$(model)
${}^{+0.007}_{−0.031}$(param) GeV and $m_b(m_b) = 4.049^{+0.104}_{−0.109}$(exp/fit) ${}^{+0.090}_{ −0.032}$(model)${}^{+0.001}_{-0.031}$(param) GeV.

Primary author

Achim Geiser (Deutsches Elektronen-Synchrotron (DE))


H1 and ZEUS Collaboration (DESY) Matthew Wing (University College London) Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))

Presentation materials