We report the first longitudinal-transverse separation of the deeply virtual exclusive Ï0 electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dÏL/dt, dÏT/dt, dÏLT/dt, and dÏTT/dt are extracted as a function of the momentum transfer to the recoil system at Q2=1.75 GeV2 and xB=0.36. The edâedÏ0 cross sections are found compatible with the small values expected from theoretical models. The enâenÏ0 cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity generalized parton distributions of the nucleon. By combining these results with previous measurements of Ï0 electroproduction off the proton, we present a flavor decomposition of the u and d quark contributions to the cross section.
Rosenbluth Separation of the Ï0 Electroproduction Cross Section off the Neutron
Bellini, V.;Giusa, A.;Gomez, J.;Russo, G.;Sperduto, M. L.;
2017-01-01
Abstract
We report the first longitudinal-transverse separation of the deeply virtual exclusive Ï0 electroproduction cross section off the neutron and coherent deuteron. The corresponding four structure functions dÏL/dt, dÏT/dt, dÏLT/dt, and dÏTT/dt are extracted as a function of the momentum transfer to the recoil system at Q2=1.75 GeV2 and xB=0.36. The edâedÏ0 cross sections are found compatible with the small values expected from theoretical models. The enâenÏ0 cross sections show a dominance from the response to transversely polarized photons, and are in good agreement with calculations based on the transversity generalized parton distributions of the nucleon. By combining these results with previous measurements of Ï0 electroproduction off the proton, we present a flavor decomposition of the u and d quark contributions to the cross section.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
