HAL : in2p3-00192985, version 1
 arXiv : 0711.4736
 Physical Review C 77 (2008) 042201
 Measurement of ep->ep $\pi^0$ beam spin asymmetries above the resonance region
 CLAS Collaboration(s)
 (2008)
 The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0711.4736
 in2p3-00192985, version 1 http://hal.in2p3.fr/in2p3-00192985 oai:hal.in2p3.fr:in2p3-00192985 Contributeur : Dominique Girod <> Soumis le : Vendredi 30 Novembre 2007, 10:44:32 Dernière modification le : Lundi 1 Décembre 2008, 15:59:49