Jaap Velthuis

ZEUS next-to-leading-order QCD analysis of data on deep inelastic scattering

Next-to-leading order QCD analyses of the ZEUS data on deep inelastic scattering together with fixed-target data have been perfomed, from which the gluon and the quark densities of the proton and the value of the strong coupling constant, alpha_s(M_Z), were extracted. The study includes a full treatment of the experimental systematic uncertainties including point-to-point correlations. The resulting uncertainties in the parton density functions are presented. A combined fit for alpha_s(M_Z) and the gluon and qurak densities yields a value of alpha_s(M_Z) in agreement with the world average. The parton density functions derived from ZEUS data alone indicate the importance of HERA data in determining sea quark and gluon distributions at low x. The limits of applicability of the theoretical formalism have been explored by comparing the fit predictions to ZEUS data at very low Q^2.

Measurement of D*(+/-) production in deep inelastic e(+/-)p scattering at DESY HERA

Inclusive production of

High Q**2 neutral current cross-sections in E+ P deep inelastic scattering at S**(1/2) = 318-GeV

D^*(2010)

Measurement of beauty production in deep inelastic scattering at HERA

mesons in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.9 pb

A search for resonance decays to lepton+jet at HERA and limits on leptoquarks

^{-1}

Measurement of high Q**2 e- p neutral current cross-sections at HERA and the extraction of xF(3)

. The decay channel

Search for resonance decays to an anti-neutrino plus jet in E + P scattering at DESY HERA

D^{* +}\to D^0 \pi^+

A high resolution resistive plate chamber tracking system developed for cosmic ray muon tomography

with

Muon scattering tomography with resistive plate chambers

D^0\to K^-\pi^+

Jet production in charged current deep inelastic E+ P scattering at HERA

and corresponding antiparticle decay were used to identify