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Inclusive transverse momentum distributions of charged particles in diffractive and non-diffractive photoproduction at HERA

  • Experimental Physics
  • Published:
Zeitschrift für Physik C Particles and Fields

Abstract

Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range −1.2<η<1.4 have been measured up top T =8 GeV usign the ZEUS detector. Diffractive and non-diffractive reactions have been selected with an average γp centre of mass (c.m.) energy of 〈W〉=180 GeV. For diffractive reactions, thep T spectra of the photon dissociation events have been measured in two intervals of the dissociated photon mass with mean values 〈M X 〉=5 GeV and 10 GeV. The inclusive transverse momentum spectra fall exponentially in the lowp T region. The non-diffractive data show a pronounced highp T tail departing from the exponential shape. Thep T distributions are compared to lower energy photoproduction data and to hadron-hadron collisions at a similar c.m. energy. The data are also compared to the results of a next-to-leading order QCD calculation.

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supported by Worldlab, Lausanne, Switzerland

supported by EU HCM contract ERB-CHRX-CT93-0376

now a self-employed consultant

on leave of absence

presently at Columbia Univ., supported by DAAD/HSPII-AUFE

supported by DAAD and European Community Program PRAXIS XXI

supported by the European Community

also supported by DESY

also supported by NSERC

on leave of absence at DESY, supported by DGICYT

Fulbright Scholar 1993–1994

on leave and partially supported by DESY 1993–95

supported by a MINERVA Fellowship

partially supported by DESY

supported by the Natural Sciences and Engineering Research Council of Canada (NSERC)

supported by the FCAR of Québec, Canada

supported by the German Federal Ministry for Research and Technology (BMFT)

supported by the MINERVA Gesellschaft für Forschung GmbH, and by the Israel Academy of Science

supported by the German Israeli Foundation, and by the Israel Academy of Science

supported by the Italian National Institute for Nuclear Physics (INFN)

supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research

supported by the Korean Ministry of Education and Korea Science and Engineering Foundation

supported by the Netherlands Foundation for Research on Matter (FOM)

supported by the Polish State Committee for Scientific Research (grant No. SPB/P3/202/93) and the Foundation for Polish-German Collaboration (proj. No. 506/92)

supported by the Polish State Committee for Scientific Research (grant No. PB 861/2/91 and No. 2 2372 9102, grant No. PB 2 2376 9102 and No. PB 2 0092 9101)

partially supported by the German Federal Ministry for Research and Technology (BMFT)

supported by the German Federal Ministry for Research and Technology (BMFT), the Volkswagen Foundation, and the Deutsche Forschungsgemeinschaft

supported by the Spanish Ministry of Education and Science through funds provided by CICYT

supported by the Particle Physics and Astronomy Research Council

supported by the US Department of Energy

supported by the US National Science Foundation

Centre for Subatomic Research, Univ. of Alberta, Canada and TRIUMF, Vancouver, Canada

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ZEUS Collaboration., Derrick, M., Krakauer, D. et al. Inclusive transverse momentum distributions of charged particles in diffractive and non-diffractive photoproduction at HERA. Z. Phys. C - Particles and Fields 67, 227–237 (1995). https://doi.org/10.1007/BF01571283

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  • DOI: https://doi.org/10.1007/BF01571283

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