Recoil Polarization for Delta Excitation in Pion Electroproduction

Details Recoil Polarization for Delta Excitation in Pion Electroproduction Recoil Polarization for Delta Excitation in Pion Electroproduction

2005-05-23

arxiv.org/abs/nucl-ex/0505024v1

Phys.Rev.Lett.95:102001,2005

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 2 figures, for PRL

Scientific paper

10.1103/PhysRevLett.95.102001

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.

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