Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections σ cc red for charm production are obtained in the kinematic range of photon virtuality 2.5 ≤ Q 2 ≤ 2000 GeV 2 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 a e-mail: levy@alzt. deep-inelastic scattering cross sections from HERA are used as input for a detailed NLO QCD analysis to study the influence of different heavy flavour schemes on the parton distribution 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 production cross sections at the LHC are investigated. Using the fixed flavour number scheme, the running mass of the charm quark is determined.

Inclusive e ± p single and double differential cross sections for neutral and charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken at a centre-of-mass energy of √ s = 319 GeV with a total integrated luminosity of 333.7 pb −1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in the range of negative fourmomentum transfer squared, Q 2 , between 60 and 50 000 GeV 2 , and Bjorken x between 0.0008 and 0.65. The measurements are combined with earlier published unpolarised H1 data to improve statistical precision and used to determine the structure function xF γZ 3 . A measurement of the neutral current parity violating structure function F γZ 2 is presented for the first time. The polarisation dependence of the charged current total cross section is also measured. The new measurements are well described by a next-to-leading order QCD fit based on all published H1 inclusive cross section data which are used to extract the parton distribution functions of the proton.

A measurement is presented of the inclusive neutral current e ± p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies E p of 920, 575, and 460 GeV. The kinematic range of the measurement covers

Inclusive ep double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken with a lepton beam energy of 27.6 GeV and two proton beam energies of E p = 460 and 575 GeV corresponding to centre-of-mass energies † Deceased a e-mail: daum@mail. of 225 and 252 GeV, respectively. The measurements cover the region of 6.5 × 10 −4 ≤ x ≤ 0.65 for 35 ≤ Q 2 ≤ 800 GeV 2 up to y = 0.85. The measurements are used together with previously published H1 data at E p = 920 GeV and lower Q 2 data at E p = 460, 575 and 920 GeV to extract the longitudinal proton structure function F L in the region 1.5 ≤ Q 2 ≤ 800 GeV 2 .

The cross section for ep → e bbX in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel bb → eeX is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q 2 ≤ 1 GeV 2 , the inelasticity 0.05 ≤ y ≤ 0.65 and the pseudorapidity of the b-quarks |η(b)|, |η(b)| ≤ 2. The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks