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

Collaboration
Mar, 1995
18 pages
Published in:
  • Z.Phys.C 67 (1995) 227-238
e-Print:
DOI:
Report number:
  • DESY-95-050
Experiments:
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Abstract:
Inclusive transverse momentum spectra of charged particles in photoproduction events in the laboratory pseudorapidity range −1.2<η<1.4-1.2<\eta<1.4 have been measured up to p_{T}=8\GeV using the ZEUS detector. Diffractive and non--diffractive reactions have been selected with an average γp\gamma p centre of mass (c.m.) energy of \langle W \rangle = 180\GeV. For diffractive reactions, the pTp_{T} spectra of the photon dissociation events have been measured in two intervals of the dissociated photon mass with mean values ⟨MX⟩=5\langle M_{X} \rangle = 5 GeV and 1010 GeV. The inclusive transverse momentum spectra fall exponentially in the low pTp_{T} region. The non--diffractive data show a pronounced high pTp_{T} tail departing from the exponential shape. The pTp_{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.
Note:
  • 23 pages, latex, 4 figures appended as uuencoded file Report-no: DESY 95-050
  • electron p: colliding beams
  • colliding beams: electron p
  • electron p: inclusive reaction
  • charged particle: photoproduction
  • photoproduction: charged particle
  • diffraction
  • nondiffractive
  • transverse momentum: spectrum
  • spectrum: transverse momentum
  • quantum chromodynamics: perturbation theory
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