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Title: Neutral Pion Electroproduction in the Δ Resonance Region

Abstract

The electroproduction of baryon resonances at high Q 2 is examined. Analysis focuses on the Δ(1232) resonance via exclusive pseudoscalar meson production of π 0 particles. Differential cross sections are extracted for exclusive π 0 electroproduction. In the central invariant mass (W) region the cross sections are used to extract resonant multipole amplitudes. In particular, the ratio of the electric quadrupole to magnetic dipole amplitudes (E2/M1) will be discussed for the Δ(1232) resonance. The transition to pQCD is discussed in terms of E2/M1 and other multipoles. The helicity amplitude A 3/2 can be used as a baryon helicity conservation meter in this context and will be discussed. The fast shrinking of the resonant contribution in the Δ region is observed at this high momentum transfer. Apart from the observables related to pQCD scaling, the transition form factor G$$*\atop{M}$$ is extracted along with the scalar to magnetic dipole ratio C2/M1.

Authors:
 [1]
  1. Rensselaer Polytechnic Inst., Troy, NY (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
989189
Report Number(s):
JLAB-PHY-09-1006; DOE/OR/23177-0756
TRN: US1007091
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BARYONS; CROSS SECTIONS; DIFFERENTIAL CROSS SECTIONS; ELECTROPRODUCTION; FORM FACTORS; HELICITY; MAGNETIC DIPOLES; MOMENTUM TRANSFER; MULTIPOLES; PIONS; PRODUCTION; PSEUDOSCALAR MESONS; QUADRUPOLES; RESONANCE; SCALARS

Citation Formats

Villano, Anthony. Neutral Pion Electroproduction in the Δ Resonance Region. United States: N. p., 2007. Web. doi:10.2172/989189.
Villano, Anthony. Neutral Pion Electroproduction in the Δ Resonance Region. United States. doi:10.2172/989189.
Villano, Anthony. Thu . "Neutral Pion Electroproduction in the Δ Resonance Region". United States. doi:10.2172/989189. https://www.osti.gov/servlets/purl/989189.
@article{osti_989189,
title = {Neutral Pion Electroproduction in the Δ Resonance Region},
author = {Villano, Anthony},
abstractNote = {The electroproduction of baryon resonances at high Q2 is examined. Analysis focuses on the Δ(1232) resonance via exclusive pseudoscalar meson production of π0 particles. Differential cross sections are extracted for exclusive π0 electroproduction. In the central invariant mass (W) region the cross sections are used to extract resonant multipole amplitudes. In particular, the ratio of the electric quadrupole to magnetic dipole amplitudes (E2/M1) will be discussed for the Δ(1232) resonance. The transition to pQCD is discussed in terms of E2/M1 and other multipoles. The helicity amplitude A3/2 can be used as a baryon helicity conservation meter in this context and will be discussed. The fast shrinking of the resonant contribution in the Δ region is observed at this high momentum transfer. Apart from the observables related to pQCD scaling, the transition form factor G$*\atop{M}$ is extracted along with the scalar to magnetic dipole ratio C2/M1.},
doi = {10.2172/989189},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 01 00:00:00 EDT 2007},
month = {Thu Nov 01 00:00:00 EDT 2007}
}

Thesis/Dissertation:
Other availability
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