Deeply inelastic pions in the exclusive reaction p(e,e{sup '}{pi}{sup +})n above the resonance region

Journal Article · Mon Dec 01 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.114022· OSTI ID:21251010

Kaskulov, Murat M; Gallmeister, Kai; Mosel, Ulrich ^[1]

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1. Institut fuer Theoretische Physik, Universitaet Giessen, D-35392 Giessen (Germany)

A model for the p(e,e{sup '}{pi}{sup +})n reaction which combines an improved treatment of gauge invariant meson-exchange currents and hard deep-inelastic scattering (DIS) of virtual photons off nucleons is proposed. It is shown that DIS dominates and explains the transverse response at moderate and high photon virtualities Q{sup 2}, whereas the longitudinal response is dominated by hadronic degrees of freedom and the pion electromagnetic form factor. This leads to a combined description of the longitudinal and transverse components of the cross section in a wide range of photon virtuality Q{sup 2} and momentum transfer to the target t and solves the longstanding problem of the observed large transverse cross sections. The latter are shown to be sensitive to the intrinsic transverse momentum distribution of partons.

• OSTI ID: 21251010
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
CROSS SECTIONS
DEEP INELASTIC SCATTERING
DEGREES OF FREEDOM
DISTRIBUTION
ELECTROMAGNETIC FORM FACTORS
ELECTRONS
GAUGE INVARIANCE
MOMENTUM TRANSFER
NEUTRONS
NUCLEONS
PARTICLE DECAY
PHOTONS
PIONS
PIONS PLUS
PROTONS
RESONANCE
TRANSVERSE MOMENTUM