Michał Adamus

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Two-pion correlations are studied for pions of like charge in K + p and + p collisions at 250 GeV/c. An enhanced production is observed at small momentum diierence and is attributed to Bose-Einstein interference between identical particles. A systematic study is presented on the innuence of parametrization and reference sample. Interpreted in terms of the(More)
Exclusive production of 0 and J== mesons in e + p collisions has been studied with the ZEUS detector in the kinematic range 0:25 < Q 2 < 50 GeV 2 , 20 < W < 167 GeV for the 0 data and 2 < Q 2 < 40 GeV 2 , 50 < W < 150 GeV for the J== data. Cross sections for exclusive 0 and J== production have been measured as a function of Q 2 , W and t. The spin-density(More)
The production of D * ± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q 2 < 1000 GeV 2 , using an integrated lumi-nosity of 363 pb −1 with the ZEUS detector at HERA. Differential cross sections have been measured and compared to next-to-leading-order QCD calculations. The cross-sections are used to extract(More)
Using the ZEUS detector at HERA, we have studied the reaction e + p ! e + X for Q 2 > 5000 GeV 2 with a 20:1 pb ?1 data sample collected during the years 1994 to 1996. For Q 2 below 15000GeV 2 , the data are in good agreement with Standard Model expectations. For Q 2 > 35000 GeV 2 , two events are observed while 0:145 0:013 events are expected. A(More)
Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections σ c¯ c red for charm production are obtained in the kinematic range of photon virtuality 2.5 ≤ Q 2 ≤ 2000 GeV 2 and Bjorken scaling variable 3 · 10 −5 ≤ x ≤ 5 · 10 −2. The combination method(More)
Measurements of the cross sections for charged current deep inelastic scattering in e + p collisions with a longitudinally polarised positron beam are presented. The measurements are based on a data sample with an integrated luminosity of 132 pb −1 collected with the ZEUS detector at HERA at a centre-of-mass energy of 318 GeV. The total cross section is(More)
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb −1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential(More)
Beauty production in deep inelastic scattering with events in which a muon and a jet are observed in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb −1. The fraction of events with beauty quarks in the data was determined using the distribution of the transverse momentum of the muon relative to the(More)
A search for events containing an isolated electron or muon and missing transverse momentum produced in e ± p collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 1994–2007 and correspond to an integrated lu-minosity of 0.98 fb −1. The observed event yields are in good overall agreement with the Standard Model(More)
The ZEUS detector has been used to study dissociation of virtual photons in events with a leading proton, γ ⋆ p → Xp, in e + p collisions at HERA. The data cover photon virtualities in two ranges, 0.03 < Q 2 < 0.60 GeV 2 and 2 < Q 2 < 100 GeV 2 , with M X > 1.5 GeV, where M X is the mass of the hadronic final state, X. Events were required to have a leading(More)