Leading role pseudovector and vector mesons in quasielastic pion electroproduction on a nucleon by longitudinal photons at comparatively high virtual momenta in the range 0.4 {<=} |k| {<=} 1 GeV/c

Journal Article · Sat Mar 15 04:00:00 EDT 2008 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778808030162· OSTI ID:22028126

Neudatchin, V G; Obukhovsky, I T; Fedorov, D K; Yudin, N P ^[1]

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1. Moscow State University, Institute of Nuclear Physics (Russian Federation)

It is shown that, under kinematical conditions of quasielastic knockout, the differential cross section for the exclusive process p(e, e Prime {pi}{sup +})n induced by longitudinal virtual photons {gamma}*{sub L} changes its physical nature as the recoil momentum |k| of the spectator nucleon grows from values in the range |k| {approx} 0.1-0.4 GeV/c, which are typical in studying the pion cloud of the nucleon, to values around |k| {approx} 1 GeV/c. Calculations within the {sup 3}P{sub 0} quark microscopic model reveal that the amplitudes for the deexcitation of vector and pseudovector mesons via the processes {rho}{sup +} + {gamma}*{sub L} {yields} {pi}{sup +} and b{sub 1}{sup +} + {gamma}*{sub L} {yields} {pi}{sup +} 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 {gamma}*{sub 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.

• OSTI ID: 22028126
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 3 Vol. 71; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANISOTROPY
AXIAL VECTOR MESONS
DE-EXCITATION
DIFFERENTIAL CROSS SECTIONS
ELECTROPRODUCTION
GEV RANGE
KNOCK-OUT REACTIONS
NUCLEONS
PARTICLE KINEMATICS
PHOTON-NUCLEON INTERACTIONS
PHOTONS
PIONS
QUARK MODEL
QUARKS
RECOILS
RHO-770 MESONS