Recoil Polarization for Delta Excitation in Pion Electroproduction
J. J. Kelly
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 sp truncation.
Create a lesson
Related papers
Measurements of γv p π+ π-p' Cross Sections with the CLAS12 Detector for Q2 from 2.4-8.0 GeV2 and W from 1.4-2.1 GeV
K. Neupane, R. W. Gothe, D. S. Carman et al.
Constraining the f0(980) Structure and Formation Dynamics via Anisotropy-Response Scaling
Roy A. Lacey
Comment on "Non-Monotonicity of Transverse-Momentum Correlations in Au+Au Collisions at RHIC"
Roy A. Lacey
Exploring nucleon spin by Drell-Yan process
Wen-Chen Chang
Modernization in processing and dissemination of experimental cross section data in EXFOR
Naohiko Otuka, Vidya Devi
Photon-induced J/ψ as a linearly polarized probe of collision geometry in relativistic heavy-ion collisions
STAR Collaboration