The exclusive electroproduction process ep→e′p′π0 was measured in the range of photon virtualities Q2=0.4-1.0GeV2 and the invariant mass range of the pπ0 system of W=1.1-1.8 GeV. These kinematics are covered in exclusive π0 electroproduction off the proton with nearly complete angular coverage in the pπ0 center-of-mass system and with high statistical accuracy. Nearly 36 000 cross-section points were measured, and the structure functions σT+ϵσL,σLT, and σTT, were extracted via fitting the φπ0 dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying N∗ and Δ∗ resonances with M>1.6 GeV. As part of a broad effort to determine the electrocouplings of the N∗ and Δ∗ resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the Nπ and π+π-p channels.

Exclusive π0p electroproduction off protons in the resonance region at photon virtualities 0.4 GeV2≤Q2≤1 GeV2

Barion L.;Contalbrigo M.;Ciullo G.;Pappalardo L. L.;
2020

Abstract

The exclusive electroproduction process ep→e′p′π0 was measured in the range of photon virtualities Q2=0.4-1.0GeV2 and the invariant mass range of the pπ0 system of W=1.1-1.8 GeV. These kinematics are covered in exclusive π0 electroproduction off the proton with nearly complete angular coverage in the pπ0 center-of-mass system and with high statistical accuracy. Nearly 36 000 cross-section points were measured, and the structure functions σT+ϵσL,σLT, and σTT, were extracted via fitting the φπ0 dependence of the cross section. A Legendre polynomial expansion analysis demonstrates the sensitivity of our data to high-lying N∗ and Δ∗ resonances with M>1.6 GeV. As part of a broad effort to determine the electrocouplings of the N∗ and Δ∗ resonances using both single- and double-pion electroproduction, this dataset is crucial for the reliable extraction of the high-lying resonance electrocouplings from the combined isospin analysis of the Nπ and π+π-p channels.
Markov, N.; Joo, K.; Burkert, V. D.; Mokeev, V. I.; Smith, L. C.; Ungaro, M.; Adhikari, S.; Amaryan, M. J.; Angelini, G.; Atac, H.; Avakian, H.; Ayerbe Gayoso, C.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Bedlinskiy, I.; Benmokhtar, F.; Biselli, A. S.; Bossu, F.; Boiarinov, S.; Briscoe, W. J.; Brooks, W. K.; Carman, D. S.; Carvajal, J. C.; Celentano, A.; Chatagnon, P.; Chetry, T.; Cole, P. L.; Contalbrigo, M.; Crede, V.; Ciullo, G.; D'Angelo, A.; Dashyan, N.; De Vita, R.; De Sanctis, E.; Defurne, M.; Deur, A.; Diehl, S.; Djalali, C.; Dupre, R.; Ehrhart, M.; El Alaoui, A.; El Fassi, L.; Eugenio, P.; Evans, C.; Filippi, A.; Ghandilyan, Y.; Girod, F. X.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hayward, T. B.; Hicks, K.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Jo, H. S.; Keller, D.; Khachatryan, M.; Khanal, A.; Khandaker, M.; Kim, A.; Kim, C. W.; Kim, W.; Klein, F. J.; Kubarovsky, V.; Lanza, L.; Leali, M.; Livingston, K.; Macgregor, I. J. D.; Marchand, D.; Mascagna, V.; Mckinnon, B.; Mineeva, T.; Mirazita, M.; Nadel-Turonski, P.; Nanda, S.; Niccolai, S.; Niculescu, G.; Osipenko, M.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Phelps, W.; Pogorelko, O.; Price, J. W.; Prok, Y.; Protopopescu, D.; Ripani, M.; Riser, D.; Rizzo, A.; Rosner, G.; Rowley, J.; Sabatie, F.; Salgado, C.; Schumacher, R. A.; Sharabian, Y. G.; Shrestha, U.; Sokhan, D.; Soto, O.; Sparveris, N.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tan, J. A.; Tyler, N.; Venturelli, L.; Voskanyan, H.; Voutier, E.; Wang, R.; Wei, X.; Wood, M. H.; Zachariou, N.
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