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Sökning: WFRF:(Thompson A. M.) > Meyer J. > (2005) > Backovic S.

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1.
  • Aktas, A, et al. (författare)
  • A direct search for stable magnetic monopoles produced in positron-proton collisions at HERA
  • 2005
  • Ingår i: The European Physical Journal C. - Springer. - 1434-6044. ; 41, s. 133-141
  • Tidskriftsartikel (refereegranskat)abstract
    • A direct search has been made for magnetic monopoles produced in e(+)p collisions at a centre of mass energy of 300 GeV at HERA. The beam pipe surrounding the interaction region in 1995-1997 was investigated using a SQUID magnetometer to look for stopped magnetic monopoles. During this time an integrated luminosity of 62 pb(-1) was delivered. No magnetic monopoles were observed and charge and mass dependent upper limits on the e(+)p production cross section are set.
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2.
  • Aktas, A, et al. (författare)
  • Search for leptoquark bosons in ep collisions at HERA
  • 2005
  • Ingår i: Physics Letters B. - Elsevier. - 0370-2693. ; 629:1, s. 9-19
  • Tidskriftsartikel (refereegranskat)abstract
    • A search for scalar and vector leptoquarks coupling to first generation fermions is performed using the e(+) p and e(-) p scattering data collected by the H1 experiment between 1994 and 2000. The data correspond to a total integrated luminosity of 117 pb(-1). No evidence for the direct or indirect production of such particles is found in data samples with a large transverse momentum final state electron or with large missing transverse momentum. Constraints on leptoquark models are established. For leptoquark couplings of electromagnetic strength, leptoquarks with masses up to 275-325 GeV are ruled out at 95% confidence level. These limits improve and supercede earlier H1 limits based on subsamples of the data used here.
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3.
  • Aktas, A, et al. (författare)
  • Measurement of charm and beauty photoproduction at HERA using D*mu correlations
  • 2005
  • Ingår i: PHYSICS LETTERS B. - ELSEVIER SCIENCE BV. - 0370-2693. ; 621:1-2, s. 56-71
  • Tidskriftsartikel (refereegranskat)abstract
    • A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*(+/-) meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher.
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4.
  • Aktas, A, et al. (författare)
  • Measurement of deeply virtual Compton scattering at HERA
  • 2005
  • Ingår i: EUROPEAN PHYSICAL JOURNAL C. - SPRINGER. - 1434-6044. ; 44:1, s. 1-11
  • Tidskriftsartikel (refereegranskat)abstract
    • A measurement is presented of elastic deeply virtual Compton scattering gamma* p -> gamma p made using e(+) p collision data corresponding to a luminosity of 46.5 pb(-1), taken with the H1 detector at HERA. The cross section is measured as a function of the photon virtuality, Q(2), the invariant mass of the gamma* p system, W, and for the first time, differentially in the squared momentum transfer at the proton vertex, t, in the kinematic range 2 < Q(2) < 80 GeV2, 30 < W < 140 GeV and vertical bar t vertical bar < 1 GeV2. QCD based calculations at next-to-leading order using generalized parton distributions can describe the data, as can colour dipole model predictions.
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5.
  • Aktas, A, et al. (författare)
  • Inclusive production of D+, D-0, D-s(+) and D*(+) mesons in deep inelastic scattering at HERA
  • 2005
  • Ingår i: EUROPEAN PHYSICAL JOURNAL C. - SPRINGER. - 1434-6044. ; 38:4, s. 447-459
  • Tidskriftsartikel (refereegranskat)abstract
    • Inclusive production cross sections are measured in deep inelastic scattering at HERA for meson states composed of a charm quark and a light antiquark or the charge conjugate. The measurements cover the kinematic region of photon virtuality 2 < Q(2) < 100 GeV2, inelasticity 0.05 < y < 0.7, D meson transverse momenta p(t)( D) greater than or equal to 2.5 GeV and pseudorapidity |eta( D)| less than or equal to 1.5. The identification of the D-meson decays and the reduction of the combinatorial background profit from the reconstruction of displaced secondary vertices by means of the H1 silicon vertex detector. The production of charmed mesons containing the light quarks u, d and s is found to be compatible with a description in which the hard scattering is followed by a factorisable and universal hadronisation process.
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