Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 44: Electromagnetic and Hadronic Probes VII

HK 44.8: Talk

Thursday, March 11, 2004, 18:45–19:00, B

Deeply Virtual Compton Scattering at HERMES — •B. Krauss^1,2, R. Shanidze^1,2, J. Volmer³, F. Ellinghaus⁴, and J. Lu⁵ — ¹Physikalisches Institut, Universität Erlangen — ²supported by BMBF under contract number 06 ER 125 I — ³Deutsches Elektronensynchrotron, Zeuthen — ⁴University of Colorado, Boulder, USA — ⁵TRIUMF, Vancouver, Canada

HERMES is a multi-purpose fixed-target experiment at HERA that studies scattering of the polarized 27.6 GeV lepton beam on internal gas targets of polarized and unpolarized hydrogen and deuterium or unpolarized heavy gases like nitrogen, neon and krypton. The HERMES spectrometer allows tracking, momentum determination, particle identification and calorimetry of the forward reaction products.

Apart from measurements of the spin-dependent structure functions and quark distributions, the apparatus also allows the investigation of hard exclusive reactions in which only one meson or photon has been created in the final state. These exclusive reactions can be related to Generalized Parton Distributions (GPDs) of the nucleon.

At HERMES the production of single photons can be due to ordinary Bremsstrahlung as well as to Deeply Virtual Compton Scattering (DVCS) on single quarks inside the nucleon. The interference of the two processes leads to helicity and charge asymmetries. The present status of the analysis will be presented.