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Recoil polarization for delta excitation in pion electroproduction
- Source :
- Physical Review Letters, Physical Review Letters, 2005, 95, pp.102001(1)-102001(6). ⟨10.1103/PhysRevLett.95.102001⟩, Physical Review Letters, American Physical Society, 2005, 95, pp.102001(1)-102001(6). ⟨10.1103/PhysRevLett.95.102001⟩
- Publication Year :
- 2005
-
Abstract
- We measured angular distributions of recoil-polarization response functions for neutral pion electroproduction for W=1.23 GeV at Q^2=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 sp truncation.<br />5 pages, 2 figures, for PRL
- Subjects :
- Quantum chromodynamics
Physics
010308 nuclear & particles physics
FOS: Physical sciences
General Physics and Astronomy
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Polarization (waves)
01 natural sciences
14.20.Gk,13.60.Le,13.40.Gp,13.88.+e
Nuclear physics
Pion
Amplitude
Recoil
0103 physical sciences
Nuclear Physics - Experiment
Nuclear Experiment (nucl-ex)
010306 general physics
Multipole expansion
Nuclear Experiment
Legendre polynomials
Excitation
Subjects
Details
- ISSN :
- 00319007 and 10797114
- Volume :
- 95
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Physical review letters
- Accession number :
- edsair.doi.dedup.....e0b514b629acc7f7cbbb87109c4474aa
- Full Text :
- https://doi.org/10.1103/PhysRevLett.95.102001⟩