{ital N} {r_arrow}{ital {Delta} } Transition from Simultaneous Measurements of p({rvec {gamma}},{pi}) and p({rvec {gamma}},{gamma})
Journal Article
·
· Physical Review Letters
OSTI ID:550566
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- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- INFN-Laboratori Nazionali di Frascati, Frascati (Italy)
- Universita di Roma Tor Vergata and INFN-Sezione di Roma 2, Rome (Italy)
- Department of Physics, University of South Carolina, Columbia, South Carolina 29208 (United States)
- Department of Physics, University of Virginia, Charlottesville, Virginia 22901 (United States)
- Physics Department, Virginia Polytechnic Institute State University, Blacksburg, Virginia 24061 (United States)
- Department of Physics, Ohio University, Athens, Ohio, 45701 (United States)
- II Physikalisches Institut, Universitaet Giessen, Giessen (Germany)
New high-precision measurements of p({rvec {gamma}},{pi}) and p({rvec {gamma}},{gamma}) cross sections and beam asymmetries have been combined with other polarization ratios in a simultaneous analysis of both reactions. Compton scattering has provided two important new constraints on the photopion amplitude. The E2/M1 mixing ratio for the N{r_arrow}{Delta} transition extracted from this analysis is [{minus}3.0{plus_minus}0.3(stat+syst) {plus_minus}0.2 (model)] {percent} . Both data and analysis of this work are in conflict with recent results from Mainz. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 550566
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 79; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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