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Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe-Heitler process in measurements on a hydrogen target

The HERMES collaboration



Hard exclusive leptoproduction of real photons from an unpolarized proton target is studied in an effort to elucidate generalized parton distributions. The data accumulated during the years 1996–2005 with the HERMES spectrometer are analyzed to yield asymmetries with respect to the combined dependence of the cross section on beam helicity and charge, thereby revealing previously unseparated contributions from deeply virtual Compton scattering and its interference with the Bethe-Heitler process. The integrated luminosity is sufficient to show correlated dependences on two kinematic variables, and provides the most precise determination of the dependence on only the beam charge.

Keywords

Lepton-Nucleon Scattering

 

E-print Number: 0909.3587

Cited: by |

Refers: to

PACS

13.60.Fz Elastic and Compton scattering

11.30.Er Charge conjugation, parity, time reversal, and other discrete symmetries

12.39.-x Phenomenological quark models

13.60.Hb Total and inclusive cross sections (including deep-inelastic processes)

Subjects

Particle physics and field theory

Dates

Issue 11 (November 2009)

Received 22 September 2009, accepted for publication 22 October 2009

Published 18 November 2009



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