25 research outputs found

    Measurement of the hadronic final state in deep inelastic scattering at HERA

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    We report on the first experimental study of the hadronic final state in deep inelastic electron-proton scattering with the H1 detector at HERA. Energy flow and transverse momentum characteristics are measured and presented both in the laboratory and in the hadronic center of mass frames. Comparison is made with QCD models distinguished by their different treatment of parton emission

    A Search for leptoquarks, leptogluons and excited leptons in H1 at HERA

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    A direct search for new particles in the H1 experiment at HERA is presented for masses ranging from 35 GeV up to ∼ 250 GeV. The data sample of 24 nb−1 accumulated during the first year of operation was analysed for signatures of scalar and vector leptoquarks, leptogluons, excited electrons and excited neutrinos with flavours of the first generation. No evidence for the production of such particles was found in various possible decay channels. Rejection limits are derived

    Hard scattering in gamma p interactions

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    We report on the investigation of the final state in interactions of quasi-real photons with protons. The data were taken with the H1 detector at the HERA ep collider. Evidence for hard interactions is seen in both single particle spectra and jet formation. The data can best be described by inclusion of resolved photon processess as predicted by QCD. © 1992.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Total photoproduction cross-section measurement at HERA energies

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    We present first results on the total photoproduction cross section measurement with the H1 detector at HERA. The data were extracted from low Q2 collisions of 26.7 GeV electrons with 820 GeV protons. The γp total cross section has been measured by two independent methods in the γp center of mass energy range from 90 to 290 GeV. For an average center of mass energy of 195 GeV a value of σtot (γp) = 159 ± 7 (stat.) ± 20 (syst.) μb was obtained. © 1993.0320 auteursSCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Measurement of inclusive jet cross-sections in photoproduction at HERA

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    The inclusive jet cross section in photoproduction has been measured as a function of transverse energy and pseudorapidity using the H 1 detector at the HERA electron-proton collider. The results are compared with leading order QCD calculations. © 1993.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Measurement of the proton structure function F2 (x, Q2) in the low-x region at HERA

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    A measurement of the proton structure function F2 (x, Q2) is presented with about 1000 neutral current deep inelastic scattering events for Bjorken x in the range x {reversed tilde equals} 10-2 - 10-4 and Q2 > 5 GeV2. The measurement is based on an integrated luminosity of 22.5 nb-1 recorded by the H1 detector in the first year of HERA operation. The structure function F2 (x, Q2) shows a significant rise with decreasing x. © 1993.0320 auteursSCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Scaling violations of the proton structure function f2 at small x

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    An analysis is presented of scaling violations of the proton structure function F2(x,Q2) measured with the H1 detector at HERA in the range of Bjorken x values between x = 3 × 10-4 and 10-2 for four-momentum transfers Q>2 larger than 8.7 GeV2. The structure function F2(x,Q2) is observed to rise linearly with ln Q2. Under the assumption that the observed scaling violations at small x ≤ 0.01 are described correctly by perturbative QCD, an estimate is obtained of the gluon distribution function G(x,Q02) at Q22 = 20 GeV2. © 1994.0320 auteursSCOPUS: ar.jinfo:eu-repo/semantics/publishe

    Measurement of the proton structure function F2 (x, Q2) in the low-x region at HERAID2 ama17324

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    Measurement of the proton structure function F2 (x, Q2) in the low-x region at HERAID2 ama17324

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