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A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

Mirazita M.;Avakian H.;Courtoy A.;Pisano S.;Adhikari S.;Amaryan M. J.;Angelini G.;Atac H.;Baltzell N. A.;Barion L.;Battaglieri M.;Bedlinskiy I.;Benmokhtar F.;Bianconi A.;Biselli A. S.;Bossu 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.;Cole P. L.;Contalbrigo M.;Crede V.;D'Angelo A.;Dashyan N.;De Vita R.;Defurne M.;Deur A.;Diehl S.;Dilks C.;Djalali C.;Dupre R.;Egiyan H.;Ehrhart M.;Alaoui A.;Fassi L.;Eugenio P.;Fegan S.;Fersch R.;Filippi A.;Forest T. A.;Ghandilyan Y.;Gavalian G.;Gilfoyle G. P.;Giovanetti K. L.;Girod F. X.;Glazier D. I.;Golovatch E.;Gothe R. W.;Griffioen K. A.;Guidal M.;Guo L.;Hafidi K.;Hakobyan H.;Hattawy M.;Hayward T. B.;Heddle D.;Hicks K.;Hobart A.;Holtrop M.;Huang Q.;Ilieva Y.;Ireland D. G.;Ishkhanov B. S.;Isupov E. L.;Jenkins D.;Jo H. S.;Joo K.;Keller D.;Khanal A.;Khandaker M.;Kim C. W.;Kim W.;Klein F. J.;Kubarovsky V.;Kuhn S. E.;Lanza L.;Leali M.;Lenisa P.;Livingston K.;Macgregor I. J. D.;Marchand D.;Markov N.;Marsicano L.;Mascagna V.;McKinnon B.;Milner R. G.;Mineeva T.;Mokeev V.;Mullen C.;Camacho C. M.;Neupane K.;Niculescu G.;O'Connell T.;Osipenko M.;Paolone M.;Pappalardo L. L.;Paremuzyan R.;Park K.;Pasyuk E.;Phelps W.;Pocanic D.;Pogorelko O.;Poudel J.;Prok Y.;Raue B. A.;Ripani M.;Ritman J.;Rizzo A.;Rossi P.;Sabatie F.;Salgado C.;Schmidt A.;Schumacher R. A.;Sharabian Y. G.;Shrestha U.;Soto O.;Sparveris N.;Stepanyan S.;Strakovsky I. I.;Strauch S.;Tyler N.;Ungaro M.;Venturelli L.;Voskanyan H.;Vossen A.;Voutier E.;Watts D.;Wei K.;Wei X.;Wood M. H.;Yale B.;Zachariou N.;Zhang J.;Zhao Z. W.

2021

Abstract

A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

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	Anno di pubblicazione
	
			2021
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevLett.126.062002
		
	Titolo della Rivista
	
			PHYSICAL REVIEW LETTERS
		
	Tutti gli autori
	
			Mirazita, M.; Avakian, H.; Courtoy, A.; Pisano, S.; Adhikari, S.; Amaryan, M. J.; Angelini, G.; Atac, H.; Baltzell, N. A.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Benmokhtar, F.; Bianconi, A.; Biselli, A. S.; Bossu, 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.; Cole, P. L.; Contalbrigo, M.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Vita, R.; Defurne, M.; Deur, A.; Diehl, S.; Dilks, C.; Djalali, C.; Dupre, R.; Egiyan, H.; Ehrhart, M.; Alaoui, A.; Fassi, L.; Eugenio, P.; Fegan, S.; Fersch, R.; Filippi, A.; Forest, T. A.; Ghandilyan, Y.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Glazier, D. I.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hattawy, M.; Hayward, T. B.; Heddle, D.; Hicks, K.; Hobart, A.; Holtrop, M.; Huang, Q.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jenkins, D.; Jo, H. S.; Joo, K.; Keller, D.; Khanal, A.; Khandaker, M.; Kim, C. W.; Kim, W.; Klein, F. J.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Leali, M.; Lenisa, P.; Livingston, K.; Macgregor, I. J. D.; Marchand, D.; Markov, N.; Marsicano, L.; Mascagna, V.; Mckinnon, B.; Milner, R. G.; Mineeva, T.; Mokeev, V.; Mullen, C.; Camacho, C. M.; Neupane, K.; Niculescu, G.; O'Connell, T.; Osipenko, M.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Phelps, W.; Pocanic, D.; Pogorelko, O.; Poudel, J.; Prok, Y.; Raue, B. A.; Ripani, M.; Ritman, J.; Rizzo, A.; Rossi, P.; Sabatie, F.; Salgado, C.; Schmidt, A.; Schumacher, R. A.; Sharabian, Y. G.; Shrestha, U.; Soto, O.; Sparveris, N.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Tyler, N.; Ungaro, M.; Venturelli, L.; Voskanyan, H.; Vossen, A.; Voutier, E.; Watts, D.; Wei, K.; Wei, X.; Wood, M. H.; Yale, B.; Zachariou, N.; Zhang, J.; Zhao, Z. W.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2474771

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