K. Daum

Precise charm-quark mass from deep-inelastic scattering

Abstract We present a determination of the charm-quark mass in the MS ¯ scheme using the data combination of charm production cross section measurements in deep-inelastic scattering at HERA. The framework of global analyses of the proton structure accounts for all correlations of the charm-quark mass with the other non-perturbative parameters, most importantly the gluon distribution function in the proton and the strong coupling constant α s ( M Z ) . We obtain at next-to-leading order in QCD the value m c ( m c ) = 1.15 ± 0.04 ( exp ) − 0.00 + 0.04 ( scale ) GeV and at approximate next-to-next-to-leading order m c ( m c ) = 1.24 ± 0.03 ( exp ) − 0.02 + 0.03 ( scale ) − 0.07 + 0.00 ( theory ) GeV with an accuracy competitive with other methods.

Measurement of F-2(c(c)over-bar) and F-2(b(b)over-bar) at high Q(2) using the H1 vertex detector at HERA

Abstract.Measurements are presented of inclusive charm and beauty cross sections in e + p collisions at HERA for values of photon virtuality Q2 > 150 GeV2 and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q2 and Bjorken x, and values for the structure functions

Search for single top quark production in ep collisions at HERA

F_2^{c\bar{c}}

Inclusive dijet production at low Bjorken-x in deep inelastic scattering

and

Multi-electron production at high transverse momenta in ep collisions at HERA

F_2^{b\bar{b}}

Determination of the charm-quark mass in the MS¯ scheme using charm production data from deep-inelastic scattering at HERA

are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics.

Running of the Charm-Quark Mass from HERA Deep-Inelastic Scattering Data

Abstract.A search for single top quark production is performed in

HERAFitter - Open source QCD fit project

e^{\pm}p

Open source QCD fit project

collisions at HERA. The search exploits data corresponding to an integrated luminosity of 118.3 pb-1. A model for the anomalous production of top quarks in a flavour changing neutral current process involving a

Measurement of the diffractive longitudinal structure function

tu\gamma