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Search for single top quark production in ep collisions at HERA
(2004)The European Physical Journal CA search for single top quark production is performed in e±p 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 tuγ coupling is investigated. Decays of top quarks into a b quark and a W boson are considered in the leptonic and the hadronic decay channels of the W. Both a cut-based ...Journal Article -
Inclusive dijet production at low Bjorken-x in deep inelastic scattering
(2004)The European Physical Journal CDijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10-4 < x < 10-2) and low photon virtualities Q 2 (5 < Q 2 < 100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, ...Journal Article -
A general search for new phenomena in ep scattering at HERA
(2004)Physics Letters BJournal Article -
Measurement of the proton structure function F2 at low Q2 in QED Compton scattering at HERA
(2004)Physics Letters BJournal Article -
Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA
(2004)The European Physical Journal CThe cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of Wγp=200 GeV in the range 0.2 < p T /M < 0.7 and |y| < 0.4, where M, p T and y are the mass, transverse momentum and rapidity of the anti-deuteron in the HERA laboratory frame, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR ...Journal Article -
Search for bosonic stop decays in R-parity violating supersymmetry in e+p collisions at HERA
(2004)Physics Letters BJournal Article -
Muon pair production in ep collisions at HERA
(2004)Physics Letters BCross sections for the production of two isolated muons up to high di-muon masses are measured in ep collisions at HERA with the H1 detector in a data sample corresponding to an integrated luminosity of 71 pb-1 at a centre of mass energy of √s=319 GeV. The results are in good agreement with Standard Model predictions, the dominant process being photon-photon interactions. Additional muons or electrons are searched for in events with two ...Journal Article -
Search for squark production in R-parity violating supersymmetry at HERA
(2004)The European Physical Journal CA search for squarks in R-parity violating supersymmetry is performed in e±p collisions at HERA using the H1 detector. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb-1 for e + p collisions and 13.5 pb-1 for e - p collisions. The resonant production of squarks via a Yukawa coupling λ′ is considered, taking into account direct and indirect R-parity violating decay modes. No ...Journal Article