Observation of Beam Spin Asymmetries in the Process e p → e ′ π + π − X with CLAS12

Hayward, T. B.; Kühn, Sebastian Paul; Wood, M. H.; Pappalardo, L. L.; Raue, B. A.; Venturelli, L.; Rossi, P.; Khachatryan, M.; Niculescu, G.; Nadel-Turonski, P.; Schmidt, Anne; Wei, X.; Sharabian, Y. G.; Joo, K.; Crede, V.; Stepanyan, S.; Paremuzyan, R.; Briscoe, W. J.; Hakobyan, H.; Deur, A.; Lanza, L.; Battaglieri, M.; Bossù, F.; Gilfoyle, G. P.; Biselli, A. S.; Joosten, S.; Carman, D. S.; Munoz Camacho, C.; Voskanyan, H.; Hattawy, M.; Bedlinskiy, I.; Thornton, A.; Ciullo, G.; Marchand, D.; Kubarovsky, V.; Dilks, C.; Angelini, G.; Kripko, A.; Soto, O.; Nanda, S.; Ungaro, M.; Watts, D. P.; Strakovsky, I. I.; Jo, H. S.; Costantini, G.; Pasyuk, E.; Benmokhtar, F.; Sokhan, D.; Gavalian, G.; Sparveris, N.; Egiyan, H.; Atac, H.; Djalali, C.; Khanal, A.; Holtrop, M.; Kim, Taegeon; Dugger, M.; Phelps, W.; Yale, B.; Mirazita, M.; Mokeev, V.; Chetry, T.; Zachariou, N.; Chatagnon, P.; Girod, F. X.; Paolone, M.; Hicks, K.; Meziani, Z. E.; Arratia, M.; Markov, Aleksandr; Keller, D.; Contalbrigo, M.; Ehrhart, M.; Fegan, S.; Hobart, A.; Diehl, S.; Sabatié, F.; McKinnon, B.; O’Connell, T. R.; Tyler, N.; Bondì, M.; De Vita, R.; Livingston, K.; Naidoo, P.; Clary, B. A.; Rizzo, A.; Neupane, K.; Dashyan, N.; Hafidi, K.; Boiarinov, S.; Kim, W.; Lee, S.; Ritman, J.; Golubenko, A. A.; Burkert, V. D.; Avakian, H.; Carvajal, J. C.; Baltzell, N. A.; Zhang, Jiayuan; El Fassi, L.; D’Angelo, A.; Movsisyan, A.; Forest, T. A.; Glazier, D. I.; Adhikari, S.; Segarra, E. P.; MacGregor, I. J. D.; Marsicano, L.; Rowley, J.; Elouadrhiri, L.; Tyson, R.; Gotra, Y.; Prok, Y.; Shrestha, U.; Hauenstein, F.; Isupov, E. L.; Griffioen, K. A.; Ayerbe Gayoso, C.; Bianconi, A.; Cole, P. L.; Vossen, A.; Salgado, C.; Strauch, S.; Bulumulla, D.; Lenisa, P.; Pogorelko, O.; Barion, L.; Wei, Daikang; Brooks, W. K.; Filippi, A.; Mascagna, V.; Dupre, R.; Niccolai, S.; Celentano, A.; Leali, M.; Defurne, M.; Gothe, R. W.; El Alaoui, A.; Osipenko, M.; Voutier, E.; Ireland, D. G.; Ripani, M.; Guidal, M.

doi:10.1103/PhysRevLett.126.152501

Journal Article

FZJ-2021-02110

Observation of Beam Spin Asymmetries in the Process e p → e ′ π + π − X with CLAS12

Hayward, T. B. ; Dilks, C. ; Vossen, A. ; Avakian, H. ; Adhikari, S. ; Angelini, G. ; Arratia, M. ; Atac, H. ; Ayerbe Gayoso, C. ; Baltzell, N. A. ; Barion, L. ; Battaglieri, M. ; Bedlinskiy, I. ; Benmokhtar, F. ; Bianconi, A. ; Biselli, A. S. ; Bondì, M. ; Bossù, F. ; Boiarinov, S. ; Briscoe, W. J. ; Brooks, W. K. ; Bulumulla, D. ; Burkert, V. D. ; Carman, D. S. ; Carvajal, J. C. ; Celentano, A. ; Chatagnon, P. ; Chetry, T. ; Ciullo, G. ; Clary, B. A. ; Cole, P. L. ; Contalbrigo, M. ; Costantini, G. ; Crede, V. ; D’Angelo, A. ; Dashyan, N. ; De Vita, R. ; Defurne, M. ; Deur, A. ; Diehl, S. ; Djalali, C. ; Dupre, R. ; Dugger, M. ; Egiyan, H. ; Ehrhart, M. ; El Alaoui, A. ; El Fassi, L. ; Elouadrhiri, L. ; Fegan, S. ; Filippi, A. ; Forest, T. A. ; Gavalian, G. ; Gilfoyle, G. P. ; Girod, F. X. ; Glazier, D. I. ; Golubenko, A. A. ; Gothe, R. W. ; Gotra, Y. ; Griffioen, K. A. ; Guidal, M. ; Hafidi, K. ; Hakobyan, H. ; Hattawy, M. ; Hauenstein, F. ; Hicks, K. ; Hobart, A. ; Holtrop, M. ; Ireland, D. G. ; Isupov, E. L. ; Jo, H. S. ; Joo, K. ; Joosten, S. ; Keller, D. ; Khachatryan, M. ; Khanal, A. ; Kim, T.FZJ* ; Kim, W. ; Kripko, A. ; Kubarovsky, V. ; Kühn, S. P. ; Lanza, L. ; Leali, M. ; Lee, S. ; Lenisa, P. ; Livingston, K. ; MacGregor, I. J. D. ; Marchand, D. ; Markov, A. ; Marsicano, L. ; Mascagna, V. ; McKinnon, B. ; Meziani, Z. E. ; Mirazita, M. ; Mokeev, V. ; Movsisyan, A. ; Munoz Camacho, C. ; Nadel-Turonski, P. ; Naidoo, P. ; Nanda, S. ; Neupane, K. ; Niccolai, S. ; Niculescu, G. ; O’Connell, T. R. ; Osipenko, M. ; Paolone, M. ; Pappalardo, L. L. ; Paremuzyan, R. ; Pasyuk, E. ; Phelps, W. ; Pogorelko, O. ; Prok, Y. ; Raue, B. A. ; Ripani, M. ; Ritman, J. (Corresponding author)FZJ* ; Rizzo, A. ; Rossi, P. ; Rowley, J. ; Sabatié, F. ; Salgado, C. ; Schmidt, A. ; Segarra, E. P. ; Sharabian, Y. G. ; Shrestha, U. ; Sokhan, D. ; Soto, O. ; Sparveris, N. ; Stepanyan, S. ; Strakovsky, I. I. ; Strauch, S. ; Thornton, A. ; Tyler, N. ; Tyson, R. ; Ungaro, M. ; Venturelli, L. ; Voskanyan, H. ; Voutier, E. ; Watts, D. P. ; Wei, D.FZJ* ; Wei, X. ; Wood, M. H. ; Yale, B. ; Zachariou, N. ; Zhang, J.

2021
APS College Park, Md.

Physical review letters 126(15), 152501 (2021) [10.1103/PhysRevLett.126.152501]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27777 doi:10.1103/PhysRevLett.126.152501

Abstract: The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here were taken in the fall of 2018 with the CLAS12 spectrometer using a 10.6 GeV longitudinally spin-polarized electron beam delivered by CEBAF at JLab. The measured asymmetries provide the first opportunity to extract the parton distribution function e(x), which provides information about the interaction between gluons and quarks, in a collinear framework that offers cleaner access than previous measurements. The asymmetries also constitute the first ever signal sensitive to the helicity-dependent two-pion fragmentation function G⊥1. A clear sign change is observed around the ρ mass that appears in model calculations and is indicative of the dependence of the produced pions on the helicity of the fragmenting quark.

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Experimentelle Hadronstruktur (IKP-1)

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Datensatz erzeugt am 2021-05-10, letzte Änderung am 2021-06-23

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