Berlin 2005 – scientific programme

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T: Teilchenphysik

T 208: Diffraktion

T 208.1: Talk

Friday, March 4, 2005, 14:00–14:15, TU H3002

Transverse target spin asymmetry of exclusive rho⁰ at HERMES — •Armine Rostomyan — HERMES/DESY, Notkestrasse 85, 22607 Hamburg, Germany

Hard exclusive production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) of the nucleon which provide an unified description of hadronic structure. This talk will report the first preliminary results for the target spin asymmetry of the ρ⁰ production on a transversely polarized hydrogen target at HERMES using the 27.6 GeV HERA positron beam. It has been predicted that the transverse spin asymmetry depends linearly on GPD E. And due to its linear dependence on the GPD E, the transverse spin asymmetry opens the perspective to extract the total angular momentum contributions J^u and J^d of the u and d quarks to the proton spin.