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The photoproduction of beauty quarks in events with two jets and a muon has been measured with the ZEUS detector at HERA using an integrated luminosity of 110 pb. The fraction of jets containing b quarks was extracted from the transverse momentum distribution of the muon relative to the closest jet. Differential cross sections for beauty production as a(More)
Photoproduction of beauty quarks in events with two jets and an electron associated with one of the jets has been studied with the ZEUS detector at HERA using an integrated luminosity of 120 pb. The fractions of events containing b quarks, and also of events containing c quarks, were extracted from a likelihood fit using variables sensitive to electron(More)
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(More)
Inclusive event-shape variables have been measured in the current region of the Breit frame for neutral current deep inelastic ep scattering using an integrated luminosity of 45.0 pb−1 collected with the ZEUS detector at HERA. The variables studied included thrust, jet broadening and invariant jet mass. The kinematic range covered was 10 < Q2 < 20 480GeV(More)
Beauty production in events containing two muons in the final state has been measured with the ZEUS detector at HERA using an integrated luminosity of 114 pb. A low transverse-momentum threshold for muon identification, in combination with the large rapidity coverage of the ZEUS muon system, gives access to almost the full phase space for beauty production.(More)
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(More)
Differential inclusive-jet cross sections have been measured for different jet radii in neutral current deep inelastic ep scattering for boson virtualities Q > 125 GeV with the ZEUS detector at HERA using an integrated luminosity of 81.7 pb. Jets were identified in the Breit frame using the kT cluster algorithm in the longitudinally inclusive mode for(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 GeV, with the ZEUS detector at HERA using integrated luminosity of 72 pb. The total visible cross section is σbb(ep → e jet μ X) = 40.9 ± 5.7 (stat.) −4.4(syst.) pb. The(More)
Isolated photon production in deep inelastic ep scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 320 pb. Measurements were made in the isolated-photon transverse-energy and pseudorapidity ranges 4 < E T < 15GeV and −0.7 < η < 0.9 for exchanged photon virtualities, Q, in the range 10 < Q < 350GeV and for invariant(More)