Recoil Polarization for Δ Excitation in Pion Electroproduction

Kelly, J.J.; Roche, R.E.; Chai, Z.; Jones, M.K.; Gayou, O.; Sarty, A.J.; Frullani, S.; Aniol, K.; Beise, E.J.; Benmokhtar, F.; Bertozzi, W.; Boeglin, W.U.; Botto, T.; Brash, E.J.; Breuer, H.; Brown, E.; Burtin, E.; Calarco, J.R.; Cavata, C.; Chang, C.C.; Chant, N.S.; Chen, J.-P.; Coman, M.; Crovelli, D.; De Leo, R.; Dieterich, S.; Escoffier, S.; Fissum, K.G.; Garde, V.; Garibaldi, F.; Georgakopoulus, S.; Gilad, S.; Gilman, R.; Glashausser, C.; Hansen, J.-O.; Higinbotham, D.W.; Hotta, A.; Huber, G.M.; Ibrahim, H.; Iodice, M.; de Jager, C.W.; Jiang, X.; Klimenko, A.; Kozlov, A.; Kumbartzki, G.; Kuss, M.; Lagamba, L.; Laveissiere, G.; LeRose, J.J.; Lindgren, R.A.; Liyanage, N.; Lolos, G.J.; Lourie, R.W.; Margaziotis, D.J.; Marie, F.; Markowitz, P.; McAleer, S.; Meekins, D.; Michaels, R.; Milbrath, B.D.; Mitchell, J.; Nappa, J.; Neyret, D.; Perdrisat, C.F.; Potokar, M.; Punjabi, V.A.; Pussieux, T.; Ransome, R.D.; Roos, P.G.; Rvachev, M.; Saha, A.; Sirca, S.; Suleiman, R.; Strauch, S.; Templon, J.A.; Todor, L.; Ulmer, P.E.; Urciuoli, G.M.; Weinstein, L.B.; Wijesooriya, K.; Wojtsekhowski, B.; Zheng, X.; Zhu, L.; Jefferson Laboratory E91011 and Hall A Collaborations

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Date

2005-09-02

Author

Kelly, J.J.

Roche, R.E.

Chai, Z.

Jones, M.K.

Gayou, O.

Sarty, A.J.

Frullani, S.

Aniol, K.

Beise, E.J.

Benmokhtar, F.

Bertozzi, W.

Boeglin, W.U.

Botto, T.

Brash, E.J.

Breuer, H.

Brown, E.

Burtin, E.

Calarco, J.R.

Cavata, C.

Chang, C.C.

Chant, N.S.

Chen, J.-P.

Coman, M.

Crovelli, D.

De Leo, R.

Dieterich, S.

Escoffier, S.

Fissum, K.G.

Garde, V.

Garibaldi, F.

Georgakopoulus, S.

Gilad, S.

Gilman, R.

Glashausser, C.

Hansen, J.-O.

Higinbotham, D.W.

Hotta, A.

Huber, G.M.

Ibrahim, H.

Iodice, M.

de Jager, C.W.

Jiang, X.

Klimenko, A.

Kozlov, A.

Kumbartzki, G.

Kuss, M.

Lagamba, L.

Laveissiere, G.

LeRose, J.J.

Lindgren, R.A.

Liyanage, N.

Lolos, G.J.

Lourie, R.W.

Margaziotis, D.J.

Marie, F.

Markowitz, P.

McAleer, S.

Meekins, D.

Michaels, R.

Milbrath, B.D.

Mitchell, J.

Nappa, J.

Neyret, D.

Perdrisat, C.F.

Potokar, M.

Punjabi, V.A.

Pussieux, T.

Ransome, R.D.

Roos, P.G.

Rvachev, M.

Saha, A.

Sirca, S.

Suleiman, R.

Strauch, S.

Templon, J.A.

Todor, L.

Ulmer, P.E.

Urciuoli, G.M.

Weinstein, L.B.

Wijesooriya, K.

Wojtsekhowski, B.

Zheng, X.

Zhu, L.

Jefferson Laboratory E91011 and Hall A Collaborations

Citation

Kelly, J.J. et al. "Recoil Polarization for Δ Excitation in Pion Electroproduction." Physical Review Letters 95, no. 10 (2005): 102001(6).

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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 ℓπ≤1 truncation.