Abstract
It is shown that, under kinematical conditions of quasielastic knockout, the differential cross section for the exclusive process p(e, e′π+)n induced by longitudinal virtual photons γ*L changes its physical nature as the recoil momentum |k| of the spectator nucleon grows from values in the range |k| ∼ 0.1–0.4 GeV/c, which are typical in studying the pion cloud of the nucleon, to values around |k| ∼ 1 GeV/c. Calculations within the 3P0 quark microscopic model reveal that the amplitudes for the deexcitation of vector and pseudovector mesons via the processes ρ+ + γ*L → π+ and b1+ + γ*L → π+ become dominant here. Concurrently, the effective momentum distributions develop a substantial angular anisotropy of about 50% with respect to the angle between the momentum of the photon γ*L and the recoil momentum of the spectator nucleon, the longitudinal differential cross sections undergoing respective changes. In this region, the energy of knock-on pions is expected to be about 5 GeV under conditions of quasilastic kinematics.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
