Measurement of the t dependence in exclusive photoproduction of gamma(1s) mesons at HERA

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, R. Aggarwal, S. Antonelli, P. Antonioli, A. Antonov, M. Arneodo, V. Aushev, Y. Aushev, O. Bachynska, A. Bamberger, A. N. Barakbaev, G. Barbagli, G. Bari, F. Barreiro, N. Bartosik, D. Bartsch, M. BasileO. Behnke, J. Behr, U. Behrens, L. Bellagamba, A. Bertolin, S. Bhadra, M. Bindi, C. Blohm, V. Bokhonov, T. Bold, K. Bondarenko, E. G. Boos, K. Borras, D. Boscherini, D. Bot, I. Brock, E. Brownson, R. Brugnera, N. Bruemmer, A. Bruni, G. Bruni, B. Brzozowska, P. J. Bussey, B. Bylsma, A. Caldwell, M. Capua, R. Carlin, C. D. Catterall, S. Chekanov, J. Chwastowski, ZEUS Collaboration

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Abstract

The exclusive photoproduction reaction gamma p -> gamma(1S)p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468 pb(-1). The measurement covers the kinematic range 60 <W <220 GeV and Q(2) <1 GeV2, where W is the photon-proton centre-of-mass energy and Q(2) is the photon virtuality. The exponential slope, b, of the t dependence of the cross section, where t is the squared four-momentum transfer at the proton vertex, has been measured, yielding b = 4.3(-1.3)(+2.0)(stat.)(-0.6)(+0.5) (syst.) GeV-2. This constitutes the first measurement of the t dependence of the gamma p -> gamma(1S)p cross section. (C) 2012 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)14-20
Number of pages7
JournalPhysics Letters B
Volume708
Issue number1-2
DOIs
Publication statusPublished - 14-Feb-2012
Externally publishedYes

Keywords

  • VIRTUAL COMPTON-SCATTERING
  • CENTRAL TRACKING DETECTOR
  • ZEUS BARREL CALORIMETER
  • J/PSI MESONS
  • UPSILON PHOTOPRODUCTION
  • VECTOR-MESONS
  • ELECTROPRODUCTION
  • DESIGN
  • CONSTRUCTION
  • QCD

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