Otto Kaufmann

Learn More
Comparative genomic hybridization was applied to map DNA gains and losses in 39 invasive ductal breast carcinomas. Frequent abnormalities included gains on chromosomal regions 1q, 8q, 11q12-13, 16p, 19, 20q and X as well as frequent losses on 1p, 5q, 6q, 9p, 11q, 13q and 16q. Furthermore, frequent losses on 4q (20 cases) and 21q (14 cases) were found for(More)
The inclusive single and double differential cross-sections for neutral and charged current processes with four-momentum transfer squared É ¾ between ½½¼ and ¿¼ ¼¼¼ Î ¾ and with Bjorken Ü between ¼¼¼¿¾ and ¼ are measured in · Ô collisions. The data were taken with the H1 detector at HERA between 1994 and 1997, and they correspond to an integrated luminosity(More)
The elastic electroproduction of mesons is studied at HERA with the H1 detector for a photon virtuality in the range ½ É ¾ ¼ Î ¾ and for a hadronic centre of mass energy in the range ¿¼ Ï ½½¼ GeV. The shape of the () mass distribution in the resonance region is measured as a function of É ¾. The full set of spin density matrix elements is determined, and(More)
Measurements of ep scattering with squared 4{momentum transfer Q 2 up to 35000 GeV 2 are compared with the expectation of the standard deep-inelastic model of lepton{nucleon scattering (DIS). For Q 2 > 15000 GeV 2 , N obs = 12 neutral current candidate events are observed where the expectation is N DIS = 4:71 0:76 events. In the same Q 2 range, N obs = 4(More)
A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One event with an e ? and five events with a are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this(More)
Internal jet structure in dijet production in deep-inelastic scattering is measured with the H1 detector at HERA. Jets with transverse energies E T,Breit > 5 GeV are selected in the Breit frame employing k ⊥ and cone jet algorithms. In the kinematic region of squared momentum transfers 10 < Q 2 120 GeV 2 and x-Bjorken values 2 · 10 −4 x Bj 8 · 10 −3 , jet(More)
The total cross sections for the elastic electroproduction of % and J== mesons for Q 2 > 8 GeV 2 and hWi ' 90 GeV=c 2 are measured at HERA with the H1 detector. The measurements are for an integrated electron?proton luminosity of ' 3 pb ?1. The dependences of the total virtual photon?proton (p) cross sections on Q 2 , W and the momentum transfer squared to(More)
Deep–inelastic scattering events with a leading baryon have been detected by the H1 experiment at HERA using a forward proton spectrometer and a forward neutron calorimeter. Semi–inclusive cross sections have been measured in the kinematic region 2 Q 2 50 GeV 2 , 6 10 ?5 x 6 10 ?3 and baryon p T 200 MeV, for events with a final state proton with energy 580(More)
A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented , using data taken with the H1 detector at HERA in 1994. The average thrust of the nal states X, which emerge from the dissociation of virtual photons in the range 10 < Q 2 < 100 GeV 2 , grows with hadronic mass M X and implies a dominant 2-jet topology. Thrust is(More)
We present a search for excited electrons, neutrinos and quarks using the H1 detector at the ep collider HERA, based on data taken in 1994 with an integrated luminosity of 2.75 pb ?1. Radiative decays of excited quarks and neutrinos have been investigated as well as decays of excited electrons into all possible electroweak gauge bosons. No evidence for new(More)