نتایج جستجو برای: goers
تعداد نتایج: 227 فیلتر نتایج به سال:
Diffractive photoproduction of D(2010) mesons was measured with the ZEUS detector at the ep collider HERA, using an integrated luminosity of 78.6 pb. The D mesons were reconstructed in the kinematic range: transverse momentum pT (D ) > 1.9GeV and pseudorapidity |η(D∗)| < 1.6, using the decay D → Dπ s followed by D → Kπ (+c.c.). Diffractive events were identified by a large gap in pseudorapidity...
Diffractive production of D(2010) mesons in deep inelastic scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 44.3 pb. Diffractive charm production is identified by the presence of a large rapidity gap in the final state of events in which a D(2010) meson is reconstructed in the decay channel D → (D → Kπ)π s (+ charge conjugate). Differential cross sec...
The cross section for high-ET dijet production in photoproduction has been measured with the ZEUS detector at HERA using an integrated luminosity of 81.8 pb. The events were required to have a virtuality of the incoming photon, Q, of less than 1GeV and a photon-proton centre-of-mass energy in the range 142 < Wγp < 293GeV. Events were selected if at least two jets satisfied the transverse-energy...
Energetic neutrons produced in ep collisions at HERA have been studied with the ZEUS detector in the photoproduction regime at a mean photonproton center-of-mass energy of 220 GeV. The neutrons carry a large fraction 0.6 < xL < 0.925 of the incoming proton energy, and the fourmomentum-transfer squared at the proton-neutron vertex is small, |t| < 0.425 GeV. The xL distribution of the neutrons is...
Characteristics of the hadronic final state of diffractive deep inelastic scattering events, ep → eXp, were studied in the kinematic range 4 < MX < 35 GeV, 4 < Q < 150 GeV, 70 < W < 250 GeV and 0.0003 < xIP < 0.03 with the ZEUS detector at HERA using an integrated luminosity of 13.8 pb. The events were tagged by identifying the diffractively scattered proton using the leading proton spectromete...
Inclusive jet differential cross sections have been measured in neutral current deep inelastic ep scattering for boson virtualities Q > 125 GeV. The data were taken using the ZEUS detector at HERA and correspond to an integrated luminosity of 38.6 pb. Jets were identified in the Breit frame using the longitudinally invariant kT cluster algorithm. Measurements of differential inclusive jet cross...
The distribution of the azimuthal angle of charged and neutral hadrons relative to the lepton plane has been studied for neutral current deep inelastic ep scattering using an integrated luminosity of 45 pb taken with the ZEUS detector at HERA. The measurements were made in the hadronic centre-of-mass system. The analysis exploits the energy-flow method, which allows the measurement to be made o...
The cross sections for inelastic photoproduction of J/ψ and ψ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 38.0 pb. The events were required to have 0.1 < z < 0.9 and 50 < W < 180 GeV, where z is the fraction of the incident photon energy carried by the J/ψ in the proton rest frame and W is the photon-proton centreof-mass energy. T...
Smoke-free laws do not harm profits: new global report As increasing numbers of governments ban smoking in workplaces, including hospitality venues such as bars and restaurants, the protestations of the tobacco industry are heard louder and ever more desperate, trying to convince employers that it is bad for business. We should not be surprised that economic arguments are being used as if emplo...
Exclusive electroproduction of φ mesons has been studied in ep collisions at √ s = 318GeV with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb. The γp cross section is presented in the kinematic range 2 < Q < 70GeV, 35 < W < 145GeV and |t| < 0.6GeV. The cross sections as functions of Q, W , t and helicity angle θh are compared to cross sections for other vector mesons. The r...
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