Yves Fleming

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The inclusive e+p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA. The data were taken in 1999 and 2000 at a centre-of-mass energy of √ s = 319GeV and correspond to an integrated luminosity of 65.2 pb−1. The cross sections are measured in the range of four-momentum transfer(More)
PURPOSE Hypoxia-selective cytotoxic agents, like tirapazamine (TPZ), must diffuse considerable distances in tumors to reach their target cell population. This study uses a new three-dimensional tissue culture model, in which cells are grown as multicellular layers (MCL), to investigate whether metabolic consumption of TPZ is sufficiently rapid to compromise(More)
A precise measurement of the inclusive deep-inelastic ep scattering cross section is reported in the kinematic range 1.5 ≤ Q ≤ 150GeV and 3 · 10 ≤ x ≤ 0.2. The data were recorded with the H1 detector at HERA in 1996 and 1997, and correspond to an integrated luminosity of 20 pb. The double differential cross section, from which the proton structure function(More)
The HERA collider has recently been upgraded to produce a factor of approximately 5 more luminosity. In parallel, upgrades to the H1 detector and trigger have been necessary. One of the projects was the design of an improved Fast Track Trigger (FTT) which should replace the old track trigger and is based on the central drift chambers of the H1 experiment.(More)
Inclusive production cross sections are measured in deep inelastic scattering at HERA for meson states composed of a charm quark and a light antiquark or the charge conjugate. The measurements cover the kinematic region of photon virtuality 2 < Q2 < 100 GeV, inelasticity 0.05 < y < 0.7, D meson transverse momenta pt(D) ≥ 2.5 GeV and pseudorapidity |η(D)| ≤(More)
A search for scalar top quarks in R–parity violating supersymmetry is performed in e+p collisions at HERA using the H1 detector. The data, taken at √ s = 319GeV and 301GeV, correspond to an integrated luminosity of 106 pb−1. The resonant production of scalar top quarks t̃ in positron quark fusion via an R–parity violating Yukawa coupling λ′ is considered(More)
A search for squarks in R-parity violating supersymmetry is performed in ep collisions at HERA at a centre of mass energy of 300 GeV, using H1 data corresponding to an integrated luminosity of 37 pb. The direct production of single squarks of any generation in positron-quark fusion via a Yukawa coupling λ is considered, taking into account R-parity(More)
Measurements are presented of inclusive charm and beauty cross sections in ep collisions at HERA for values of photon virtuality 12 ≤ Q ≤ 60 GeV and of the Bjorken scaling variable 0.0002 ≤ x ≤ 0.005. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to(More)
Deep-inelastic positron-proton interactions at low values of Bjorken-x down to x ≈ 4 · 10 which give rise to high transverse momentum π-mesons are studied with the H1 experiment at HERA. The inclusive cross section for π-mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse(More)
A search for single top quark production is performed in ep collisions at HERA. The search exploits data corresponding to an integrated luminosity of 118.3 pb. 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(More)