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Recoil Polarization for Delta Excitation in Pion Electroproduction

Kelly, J J and Fissum, Kevin LU (2005) In Physical Review Letters 95.
Abstract
We measured angular distributions of recoil-polarization response functions for neutral pion electroproduction for W=1.23 GeV at Q2=1.0 (GeV/c)2, obtaining 14 separated response functions plus 2 Rosenbluth combinations; of these, 12 have been observed for the first time. Dynamical models do not describe quantities governed by imaginary parts of interference products well, indicating the need for adjusting magnitudes and phases for nonresonant amplitudes. We performed a nearly model-independent multipole analysis and obtained values for Re (S1+/M1+)=-(6.84±0.15)% and Re (E1+/M1+)=-(2.91±0.19)% that are distinctly different from those from the traditional Legendre analysis based upon M1+ dominance and 1 truncation.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
95
publisher
American Physical Society
external identifiers
  • WOS:000231615700008
  • Scopus:27144504173
ISSN
1079-7114
DOI
10.1103/PhysRevLett.95.102001
language
English
LU publication?
yes
id
81c08aa9-c6d6-4412-b756-55c2b405d8d5 (old id 713734)
date added to LUP
2007-12-11 13:03:45
date last changed
2017-01-15 04:35:59
@article{81c08aa9-c6d6-4412-b756-55c2b405d8d5,
  abstract     = {We measured angular distributions of recoil-polarization response functions for neutral pion electroproduction for W=1.23 GeV at Q2=1.0 (GeV/c)2, obtaining 14 separated response functions plus 2 Rosenbluth combinations; of these, 12 have been observed for the first time. Dynamical models do not describe quantities governed by imaginary parts of interference products well, indicating the need for adjusting magnitudes and phases for nonresonant amplitudes. We performed a nearly model-independent multipole analysis and obtained values for Re (S1+/M1+)=-(6.84±0.15)% and Re (E1+/M1+)=-(2.91±0.19)% that are distinctly different from those from the traditional Legendre analysis based upon M1+ dominance and 1 truncation.},
  articleno    = {102001},
  author       = {Kelly, J J and Fissum, Kevin},
  issn         = {1079-7114},
  language     = {eng},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Recoil Polarization for Delta Excitation in Pion Electroproduction},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.95.102001},
  volume       = {95},
  year         = {2005},
}