M Riveline

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  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +403 others
  • 2008
The photoproduction reaction γp → µ + µ − p has been studied in ep interactions using the ZEUS detector at HERA. The data sample corresponds to an integrated luminosity of 43.2 pb −1. The Υ meson has been observed in photoproduction for the first time. The sum of the products of the elastic Υ(1S), Υ(2S), Υ(3S) photoproduction cross sections with their(More)
The beauty production cross section for deep inelastic scattering events with at least one hard jet in the Breit frame together with a muon has been measured, for photon virtualities Q 2 > 2 GeV 2 , with the ZEUS detector at HERA using integrated luminosity of 72 pb −1. The total visible cross section is σ bb (ep → e jet µ X) = 40.9 ± 5.7 (stat.) +6.0 −4.4(More)
  • Zeus Collaboration, J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill +412 others
  • 2007
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)
  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +421 others
  • 2007
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)
  • J Breitweg, S Chekanov, M Derrick, D Krakauer, S Magill, B Musgrave +384 others
  • 1999
Elastic and proton–dissociative photoproduction of ρ 0 , φ and J/ψ vector mesons (γp → V p, γp → V N , respectively) have been measured in e + p interactions at HERA up to −t = 3 GeV 2 , where t is the four-momentum transfer squared at the photon–vector meson vertex. The analysis is based on a data sample in which photoproduction reactions were tagged by(More)
  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +412 others
  • 1997
The reaction γ p → J/ψ p has been studied in ep interactions using the ZEUS detector at HERA. The cross section for elastic J/ψ photoproduction has been measured as a function of the photon-proton centre of mass energy W in the range 40 < W < 140 GeV at a median photon virtuality Q 2 of 5 × 10 −5 GeV 2. The photoproduction cross section, σ γp→J/ψp , is(More)
  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +407 others
  • 1998
Differential dijet cross sections have been measured with the ZEUS detector for pho-toproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross section has been measured as a function of the fraction of the photon (x OBS γ) and pomeron (β OBS)(More)
  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +416 others
  • 2008
We present a measurement of the inelastic, non diffractive J/ψ photoproduction cross section in the reaction e + p → e + J/ψX with the ZEUS detector at HERA. The J/ψ was identified using both the µ + µ − and e + e − decay channels and events were selected within the range 0.4 < z < 0.9 (0.5 < z < 0.9) for the muon (electron) decay mode, where z is the(More)
  • J Breitweg, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +413 others
  • 2008
A global event shape analysis of the multihadronic final states observed in neutral current deep inelastic scattering events with a large rapidity gap with respect to the proton direction is presented. The analysis is performed in the range 5 ≤ Q 2 ≤ 185 GeV 2 and 160 ≤ W ≤ 250 GeV, where Q 2 is the virtuality of the photon and W is the virtual-photon(More)
  • Zeus Collaboration, M Derrick, D Krakauer, S Magill, D Mikunas, B Musgrave +428 others
  • 2007
Deep inelastic charged{current reactions have been studied in e + p and e ? p collisions at a center of mass energy of about 300 GeV in the kinematic region Q 2 >200 GeV 2 and x>0:006 using the ZEUS detector at HERA. The integrated cross sections for Q 2 >200 GeV 2 are found to be e + p!X ?3:4 pb. Diierential cross sections have been measured as functions(More)