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تعداد نتایج: 244 فیلتر نتایج به سال:
Glucose-6-phosphate dehydrogenase (G6PD) deficiency, one of the most common red cell abnormalities, is characterized by a wide clinical, biochemical, and molecular heterogeneity. In this study we have determined the molecular basis of G6PD deficiency in a sample of 70 male subjects, originating from different parts of Italy, who all shared a clinical and biochemical phenotype identical or very ...
A search for single-top production, ep → etX, has been made with the ZEUS detector at HERA using an integrated luminosity of 130.1 pb. Events from both the leptonic and hadronic decay channels of the W boson resulting from the decay of the top quark were sought. For the leptonic mode, the search was made for events with isolated high-energy leptons and significant missing transverse momentum. F...
A search for physics beyond the Standard Model has been performed with highQ neutral current deep inelastic scattering events recorded with the ZEUS detector at HERA. Two data sets, ep → eX and ep → eX, with respective integrated luminosities of 112 pb and 16 pb, were analyzed. The data reach Q values as high as 40000GeV. No significant deviations from Standard Model predictions were observed. ...
Exclusive production of ρ0 and J/ψ mesons in e+p collisions has been studied with the ZEUS detector in the kinematic range 0.25 < Q2 < 50 GeV, 20 < W < 167 GeV for the ρ0 data and 2 < Q2 < 40 GeV, 50 < W < 150 GeV for the J/ψ data. Cross sections for exclusive ρ0 and J/ψ production have been measured as a function of Q2, W and t. The spin-density matrix elements r04 00, r 1 1−1 and Re r 5 10 ha...
A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q inelastic neutral current scattering, ep → eX, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton (γ p) cross-section is presented for 0.11 ≤ Q ≤ 0.65 GeV and 2× 10 ≤ x ≤ 6× 10, corresponding to a range...
The ZEUS inclusive differential cross-section data from HERA, for charged and neutral current processes taken with e and e beams, together with differential cross-section data on inclusive jet production in ep scattering and dijet production in γp scattering, have been used in a new NLO QCD analysis to extract the parton distribution functions of the proton. The input of jet-production data con...
A search for single-top production, ep → etX, has been made with the ZEUS detector at HERA using an integrated luminosity of 130.1 pb. Events from both the leptonic and hadronic decay channels of the W boson resulting from the decay of the top quark were sought. For the leptonic mode, the search was made for events with isolated high-energy leptons and significant missing transverse momentum. F...
A search for stop production in R-parity-violating supersymmetry has been performed in ep interactions with the ZEUS detector at HERA, using an integrated luminosity of 65 pb. At HERA, the R-parity-violating coupling λ allows resonant squark production, ed → q̃. Since the lowest-mass squark state in most supersymmetry models is the light stop, t̃, this search concentrated on production of t̃, foll...
The production of beauty quarks with a D and a muon in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb. Low transverse-momentum thresholds for the muon and D meson allow a measurement of beauty production closer to the production threshold than previous measurements. The beauty signal was extracted using the charge correlations and angul...
First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb. Cross sections are given as a function of the pseudorapidity and the transverse energy (η , E γ T ) of the photon, for E γ T > 5 GeV in the γp centreof-mass energy range 134–285 GeV. Comparisons are made with predict...
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