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10 papers · 2 filters
Beam-helicity asymmetry in photon and pion electroproduction in the Delta(1232) resonance region at Q^2= 0.35 (GeV/c)^2
A1 Collaboration, I. K. Bensafa, P. Achenbach +40
The beam-helicity asymmetry has been measured simultaneously for the reactions (e p \to e p γ) and (e p \to e p π^0) in the resonance region at 0.35 (GeV/c). T…
Drell-Yan processes, transversity and light-cone wavefunctions
B. Pasquini, M. Pincetti, S. Boffi
The unpolarized, helicity and transversity distributions of quarks in the proton are calculated in the overlap representation of light-cone wavefunctions truncated to the lowest or…
Effective role of unpolarized nonvalence partons in Drell-Yan single spin asymmetries
Andrea Bianconi, Marco Radici
We perform numerical simulations of the Sivers effect from single spin asymmetries in Drell-Yan processes on transversely polarized protons. We consider colliding antiprotons and p…
Matrix elements and Parton Shower in the event generator BABAYAGA
G. Balossini, C. M. Carloni Calame, G. Montagna +2
A new version of the event generator BABAYAGA is presented, which is based on an original matching of the Parton Shower approach with the complete exact O(alpha) matrix element for…
Precision electroweak calculation of the charged current Drell-Yan process
C. M. Carloni Calame, G. Montagna, O. Nicrosini +1
We present a detailed study of the charged current Drell-Yan process, which includes the exact O(alpha) electroweak corrections properly matched with leading-log effects due to mul…
Generalized parton distributions in a meson cloud model
B. Pasquini, S. Boffi
We present a model calculation of the generalized parton distributions where the nucleon is described by a quark core surrounded by a mesonic cloud. In the one-meson approximation,…