22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

Deeply Virtual Exclusive Reactions with CLAS

22 Jul 2010, 09:40
Salle 251 ()

Salle 251

Parallel Session Talk 04 - Hadronic Structure, Parton Distributions, soft QCD, Spectroscopy 04 - Hadronic Structure, Parton Distributions, soft QCD, Spectroscopy


Dr Valery The CLAS Collaboration (Jefferson Lab)


Deeply Virtual Exclusive Reactions with CLAS Deeply virtual exclusive reactions offer an unique opportunity to study the structure of the nucleon at the parton level as one varies both the size of the probe, i.e. the photon virtuality Q^2, and the momentum transfer to the nucleon t. Such processes can reveal much more information about the structure of the nucleon than either inclusive electroproduction (Q^2 only) or elastic form factors (t=-Q^2). A dedicated experiments to study Deeply Virtual Compton Scattering (DVCS) and Deeply Virtual Meson Production (DVMP) has been carried out in Hall B at Jefferson Lab. DVCS helicity-dependent and helicity–independent cross sections, as well as beam spin asymmetry, and cross sections and asymmetries for the π0 and η exclusive electroproduction in a very wide kinematic range of Q^2, xB and t have been measured with CLAS. The preliminary data will be presented for the wide kinematic range in Q^2=1-4.5 GeV^2, xB=0.1-0.5 and t up to 2 GeV^2. We view the work presented in this report as leading into the program of the Jefferson Lab 12 GeV upgrade. The increased energy and luminosity will allow us to make the analysis at much higher Q^2 and xB and perform Rosenbluth L/T separations of the cross sections. Exclusive electroproduction of the rho+ meson on the proton at CLAS We will present our latest results on rho+ exclusive electroproduction on the proton measured with the CLAS detector of Jefferson Lab. We have measured for the first time ever for this process the longitudinal and transverse parts of the cross sections in the kinematic domain 0.15

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