Recoil polarization for Delta excitation in pion electroproduction -
art. no. 102002

Kelly, JJ
Roche, RE
Chai, Z
Jones, MK
Gayou, O and
Sarty, AJ
Frullani, S
Aniol, K
Beise, EJ
Benmokhtar, F
and Bertozzi, W
Boeglin, WU
Botto, T
Brash, EJ
Breuer, H
and Brown, E
Burtin, E
Calarco, JR
Cavata, C
Chang, CC
and Chant, NS
Chen, JP
Coman, M
Crovelli, D
De Leo, R
and Dieterich, S
Escoffier, S
Fissum, KG
Garde, V and
Garibaldi, F
Georgakopoulus, S
Gilad, S
Gilman, R and
Glashausser, C
Hansen, JO
Higinbotham, DW
Hotta, A and
Huber, GM
Ibrahim, H
Iodice, M
de Jager, CW
Jiang, X and
Klimenko, A
Kozlov, A
Kumbartzki, G
Kuss, M
Lagamba, L
and Laveissiere, G
LeRose, JJ
Lindgren, RA
Liyanage, N and
Lolos, GJ
Lourie, RW
Margaziotis, DJ
Marie, F
Markowitz,
P
McAleer, S
Meekins, D
Michaels, R
Milbrath, BD and
Mitchell, J
Nappa, J
Neyret, D
Perdrisat, CF
Potokar, M
and Punjabi, VA
Pussieux, T
Ransome, RD
Roos, PG and
Rvachev, M
Saha, A
Sirca, S
Suleiman, R
Strauch, S and
Templon, JA
Todor, L
Ulmer, PE
Urciuoli, GM
Weinstein,
LB
Wijesooriya, K
Wojtsekhowski, B
Zheng, X
Zhu, L and
Jefferson Lab E91011 Collaboration
Hall A Collaboration

Recoil polarization for Delta excitation in pion electroproduction - art. no. 102002

Authors: JJ Kelly Roche, RE Chai, Z Jones, MK Gayou, O and Sarty, AJ Frullani, S Aniol, K Beise, EJ Benmokhtar, F and Bertozzi, W Boeglin, WU Botto, T Brash, EJ Breuer, H and Brown, E Burtin, E Calarco, JR Cavata, C Chang, CC and Chant, NS Chen, JP Coman, M Crovelli, D De Leo, R and Dieterich, S Escoffier, S Fissum, KG Garde, V and Garibaldi, F Georgakopoulus, S Gilad, S Gilman, R and Glashausser, C Hansen, JO Higinbotham, DW Hotta, A and Huber, GM Ibrahim, H Iodice, M de Jager, CW Jiang, X and Klimenko, A Kozlov, A Kumbartzki, G Kuss, M Lagamba, L and Laveissiere, G LeRose, JJ Lindgren, RA Liyanage, N and Lolos, GJ Lourie, RW Margaziotis, DJ Marie, F Markowitz, P McAleer, S Meekins, D Michaels, R Milbrath, BD and Mitchell, J Nappa, J Neyret, D Perdrisat, CF Potokar, M and Punjabi, VA Pussieux, T Ransome, RD Roos, PG and Rvachev, M Saha, A Sirca, S Suleiman, R Strauch, S and Templon, JA Todor, L Ulmer, PE Urciuoli, GM Weinstein, LB Wijesooriya, K Wojtsekhowski, B Zheng, X Zhu, L and Jefferson Lab E91011 Collaboration Hall A Collaboration
Publication date: 1 January 2005
Publisher

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 l(pi)<= 1 truncation

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