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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 G1. 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.

Observation of Beam Spin Asymmetries in the Process ep →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.;Bondi M.;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. 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 A.;Kim W.;Kripko A.;Kubarovsky V.;Kuhn S. E.;Lanza L.;Leali M.;Lee S.;Lenisa P.;Livingston K.;Macgregor I. J. D.;Marchand D.;Markov N.;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.;Rizzo A.;Rossi P.;Rowley J.;Sabatie 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 K.;Wei X.;Wood M. H.;Yale B.;Zachariou N.;Zhang J.

2021

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 G1. 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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	Anno di pubblicazione
	
			2021
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevLett.126.152501
		
	Titolo della Rivista
	
			PHYSICAL REVIEW LETTERS
		
	Tutti gli autori
	
			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.; Bondi, M.; 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. 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, A.; Kim, W.; Kripko, A.; Kubarovsky, V.; Kuhn, S. E.; Lanza, L.; Leali, M.; Lee, S.; Lenisa, P.; Livingston, K.; Macgregor, I. J. D.; Marchand, D.; Markov, N.; 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.; Rizzo, A.; Rossi, P.; Rowley, J.; Sabatie, 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, K.; Wei, X.; Wood, M. H.; Yale, B.; Zachariou, N.; Zhang, J.
		
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2474009

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