Quasifree pion electroproduction from nuclei in the {Delta} region

Journal Article · Wed Jan 01 04:00:00 EST 1997 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.55.318· OSTI ID:436411

Lee, F X ^[1]; Bennhold, C ^[2]; Wright, L E ^[3]

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1. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (CANADA)
2. Center for Nuclear Studies, Department of Physics, The George Washington University, Washington, D.C. 20052 (United States)
3. Institute of Nuclear and Particle Physics, Department of Physics, Ohio University, Athens, Ohio 45701 (United States)

We present calculations of the reaction A(e,e{sup {prime}}{pi}N)B in the distorted (and plane) wave impulse approximation. The reaction allows for the study of the production process in the nuclear medium without being obscured by the details of nuclear transition densities. First, a pion electroproduction operator suitable for nuclear calculations is obtained by extending the Blomqvist-Laget photoproduction operator to the virtual photon case, which describes the existing data reasonably well. It is applied in nuclei to predict nuclear cross sections under a variety of kinematic arrangements. Issues such as the effects of the interference of the {Delta} resonance with the background, sensitivities to the quadrupole component of the {Delta} excitation and to the electromagnetic form factors, and the role of final-state interactions are studied in detail. It is found that the longitudinal and the LT interference structure functions in (e,e{sup {prime}}{pi}{sup 0}N) are sufficiently sensitive to extract medium modifications of the {Delta} quadrupole component. Methods on how to experimentally separate the various pieces in the coincidence cross section are suggested. Finally, the model is compared to a recent SLAC experiment. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: FG02-95ER40907; FG02-87ER40370
• OSTI ID: 436411
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 55; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
DELTA BARYONS
DISTORTED WAVE THEORY
DWBA
ELECTROMAGNETIC FORM FACTORS
ELECTRON REACTIONS
ELECTROPRODUCTION
FINAL-STATE INTERACTIONS
IMPULSE APPROXIMATION
INTERFERENCE
PHOTOPRODUCTION
PIONS
QUADRUPOLES
QUASI-FREE REACTIONS
SENSITIVITY
STRUCTURE FUNCTIONS