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Article ; Online: 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 / 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, 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 / 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, K / Wei, X / Wood, M H / Yale, B / Zachariou, N / Zhang, J

Physical review letters

2021 Volume 126, Issue 15, Page(s) 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 ...

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.
Language	English
Publishing date	2021-04-30
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.152501
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Article ; Online: Extraction of Beam-Spin Asymmetries from the Hard Exclusive π^{+} Channel off Protons in a Wide Range of Kinematics.

Diehl, S / Joo, K / Kim, A / Avakian, H / Kroll, P / Park, K / Riser, D / Semenov-Tian-Shansky, K / Tezgin, K / Adhikari, K P / Adhikari, S / Amaryan, M J / Angelini, G / Asryan, G / Atac, H / Barion, L / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F /

Bianconi, A / Biselli, A S / 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 / Clark, L / Cole, P L / Contalbrigo, M / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Dilks, C / Djalali, C / Dupre, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Eugenio, P / Filippi, A / Forest, T A / Ghandilyan, Y / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Glazier, D I / Golovatch, E / Gothe, R W / Griffioen, K A / Guidal, M / Guo, L / Hakobyan, H / Harrison, N / Hattawy, M / Hayward, T B / Heddle, D / Hicks, K / Holtrop, M / Ilieva, Y / Ireland, D G / Ishkhanov, B S / Isupov, E L / Jenkins, D / Jo, H S / Joosten, S / Keller, D / Khachatryan, M / Khanal, A / Khandaker, M / Kim, C W / Kim, W / 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 / Meziani, Z E / Mineeva, T / Mirazita, M / Mokeev, V / Munoz Camacho, C / Nadel-Turonski, P / Niculescu, G / Osipenko, M / Paolone, M / Pappalardo, L L / Pasyuk, E / Phelps, W / Pogorelko, O / Price, J W / Prok, Y / Raue, B A / Ripani, M / Rizzo, A / Rossi, P / Rowley, J / Sabatié, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shrestha, U / Soto, O / Sparveris, N / Stepanyan, S / Stoler, P / Strakovsky, I I / Strauch, S / Tan, J A / Tyler, N / Ungaro, M / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, X / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2020 Volume 125, Issue 18, Page(s) 182001

Abstract: We have measured beam-spin asymmetries to extract the sinϕ moment A_{LU}^{sinϕ} from the hard exclusive e[over →]p→e^{'}nπ^{+} reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center ...

Abstract	We have measured beam-spin asymmetries to extract the sinϕ moment A_{LU}^{sinϕ} from the hard exclusive e[over →]p→e^{'}nπ^{+} reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center of mass. The A_{LU}^{sinϕ} moment has been measured up to 6.6 GeV^{2} in -t, covering the kinematic regimes of generalized parton distributions (GPD) and baryon-to-meson transition distribution amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found A_{LU}^{sinϕ} to be negative, while a sign change was observed near 90° in the center of mass. The unique results presented in this Letter will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.
Language	English
Publishing date	2020-11-16
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.182001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs.

Mirazita, M / Avakian, H / Courtoy, A / Pisano, S / Adhikari, S / Amaryan, M J / Angelini, Giovanni / Atac, H / Baltzell, N A / Barion, L / Battaglieri, M / Bedlinskiy, I / Benmokhtar, Fatiha / Bianconi, A / Biselli, A S / 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 / 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 El / Fassi, L El / 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 Munoz / 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 / Sabatié, 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

Physical review letters

2020 Volume 126, Issue 6, Page(s) 62002

Abstract: A first measurement of the longitudinal beam spin asymmetry A_{LU} in the semi-inclusive electroproduction of pairs of charged pions is reported. A_{LU} is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton ... ...

Abstract	A first measurement of the longitudinal beam spin asymmetry A_{LU} in the semi-inclusive electroproduction of pairs of charged pions is reported. A_{LU} 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 A_{LU}^{sinϕ_{R}} 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.
Language	English
Publishing date	2020-12-01
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.062002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei.

Duer, M / Schmidt, A / Pybus, J R / Segarra, E P / Hrnjic, A / Denniston, A W / Weiss, R / Hen, O / Piasetzky, E / Weinstein, L B / Barnea, N / Korover, I / Cohen, E O / Hakobyan, H / Adhikari, S / Angelini, Giovanni / Battaglieri, M / Beck, A / Bedlinskiy, I /

Biselli, A S / Boiarinov, S / Brooks, W / Burkert, V D / Cao, F / Carman, D S / Celentano, A / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Cortes, O / Crede, V / Cruz Torres, R / D'Angelo, A / Dashyan, N / De Sanctis, E / De Vita, R / Deur, A / Diehl, S / Djalali, C / Dupre, R / Duran, Burcu / Egiyan, H / El Alaoui, A / El Fassi, L / Eugenio, P / Filippi, A / Forest, T A / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Golovatch, E / Gothe, R W / Griffioen, K A / Guo, L / Hafidi, K / Hanretty, C / Harrison, N / Hattawy, M / Hauenstein, F / Hayward, T B / Heddle, D / Hicks, K / Holtrop, M / Ilieva, Y / Ireland, D G / Ishkhanov, B S / Isupov, E L / Jo, H S / Joo, K / Kabir, M L / Keller, D / Khachatryan, M / Khanal, A / Khandaker, M / Kim, W / Klein, F J / Kubarovsky, V / Kuhn, S E / Lanza, L / Laskaris, G / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Markov, N / McKinnon, B / Mey-Tal Beck, S / Mirazita, M / Mokeev, V / Montgomery, R A / Movsisyan, A / Munoz Camacho, C / Mustapha, B / Nadel-Turonski, P / Niccolai, S / Niculescu, G / Osipenko, M / Ostrovidov, A I / Paolone, M / Paremuzyan, R / Park, K / Pasyuk, E / Patsyuk, M / Phelps, W / Pogorelko, O / Prok, Y / Protopopescu, D / Ripani, M / Rizzo, A / Rosner, G / Rossi, P / Sabatié, F / Schmookler, B A / Schumacher, R A / Sharabian, Y / Skorodumina, Iu / Sokhan, D / Sparveris, N / Stepanyan, S / Strauch, S / Taiuti, M / Tan, J A / Tyler, N / Ungaro, M / Voskanyan, H / Voutier, E / Wang, R / Wei, X / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W / Zheng, X

Physical review letters

2019 Volume 122, Issue 17, Page(s) 172502

Abstract: We measured the triple coincidence A(e,e^{'}np) and A(e,e^{'}pp) reactions on carbon, aluminum, iron, and lead targets at Q^{2}>1.5 (GeV/c)^{2}, x_{B}>1.1 and missing momentum >400 MeV/c. This was the first direct measurement of both proton-proton (pp) ...

Abstract	We measured the triple coincidence A(e,e^{'}np) and A(e,e^{'}pp) reactions on carbon, aluminum, iron, and lead targets at Q^{2}>1.5 (GeV/c)^{2}, x_{B}>1.1 and missing momentum >400 MeV/c. This was the first direct measurement of both proton-proton (pp) and neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton (pp) to neutron-proton (np) reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for single-charge exchange effects decreased the SRC pairs ratio to ∼3%, which is lower than previous results. Comparisons to theoretical generalized contact formalism (GCF) cross-section calculations show good agreement using both phenomenological and chiral nucleon-nucleon potentials, favoring a lower pp to np pair ratio. The ability of the GCF calculation to describe the experimental data using either phenomenological or chiral potentials suggests possible reduction of scale and scheme dependence in cross-section ratios. Our results also support the high-resolution description of high-momentum states being predominantly due to nucleons in SRC pairs.
Language	English
Publishing date	2019-05-20
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.122.172502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Experimental determination of the evolution of the Bjorken integral at low Q2.

Deur, A / Bosted, P / Burkert, V / Cates, G / Chen, J-P / Choi, Seonho / Crabb, D / de Jager, C W / De Vita, R / Dodge, G E / Fatemi, R / Forest, T A / Garibaldi, F / Gilman, R / Hughes, E W / Jiang, X / Korsch, W / Kuhn, S E / Melnitchouk, W /

Meziani, Z-E / Minehart, R / Skabelin, A V / Slifer, K / Taiuti, M / Yun, J

Physical review letters

2004 Volume 93, Issue 21, Page(s) 212001

Abstract: We extract the Bjorken integral Gamma1(p-n) in the range 0.17 < Q2 < 1.10 GeV2 from inclusive scattering of polarized electrons by polarized protons, deuterons, and 3He, for the region in which the integral is dominated by nucleon resonances. These data ... ...

Abstract	We extract the Bjorken integral Gamma1(p-n) in the range 0.17 < Q2 < 1.10 GeV2 from inclusive scattering of polarized electrons by polarized protons, deuterons, and 3He, for the region in which the integral is dominated by nucleon resonances. These data bridge the domains of the hadronic and partonic descriptions of the nucleon. In combination with earlier measurements at higher Q2, we extract the nonsinglet twist-4 matrix element f2.
Language	English
Publishing date	2004-11-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.93.212001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: Extraction of beam-spin asymmetries from the hard exclusive $\pi^{+}$ channel off protons in a wide range of kinematics

Diehl, S. / Joo, K. / Kim, A. / Avakian, H. / Kroll, P. / Park, K. / Riser, D. / Semenov-Tian-Shansky, K. / Tezgin, K. / Adhikari, K. P. / Adhikari, S. / Amaryan, M. J. / Angelini, G. / Asryan, G. / Atac, H. / Barion, L. / Battaglieri, M. / Bedlinskiy, I. / Benmokhtar, F. /

Bianconi, A. / Biselli, A. S. / Boss`u, 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. / Clark, L. / Cole, P. L. / Contalbrigo, M. / Crede, V. / D'Angelo, A. / Dashyan, N. / De Vita, R. / Defurne, M. / Deur, A. / Dilks, C. / Djalali, C. / Dupre, R. / Egiyan, H. / Ehrhart, M. / Alaoui, A. El / Fassi, L. El / Eugenio, P. / Filippi, A. / Forest, T. A. / Ghandilyan, Y. / Gilfoyle, G. P. / Giovanetti, K. L. / Girod, F. X. / Glazier, D. I. / Golovatch, E. / Gothe, R. W. / Griffioen, K. A. / Guidal, M. / Guo, L. / Hakobyan, H. / Harrison, N. / Hattawy, M. / Hayward, T. B. / Heddle, D. / Hicks, K. / Holtrop, M. / Ilieva, Y. / Ireland, D. G. / Ishkhanov, B. S. / Isupov, E. L. / Jenkins, D. / Jo, H. S. / Joosten, S. / Keller, D. / Khachatryan, M. / Khanal, A. / Khandaker, M. / Kim, C. W. / Kim, W. / 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. / Meziani, Z. E. / Mineeva, T. / Mirazita, M. / Mokeev, V. / Camacho, C. Munoz / Nadel-Turonski, P. / Niculescu, G. / Osipenko, M. / Paolone, M. / Pappalardo, L. L. / Pasyuk, E. / Phelps, W. / Pogorelko, O. / Price, J. W. / Prok, Y. / Raue, B. A. / Ripani, M. / Rizzo, A. / Rossi, P. / Rowley, J. / Sabatie, F. / Salgado, C. / Schmidt, A. / Schumacher, R. A. / Sharabian, Y. G. / Shrestha, U. / Soto, O. / Sparveris, N. / Stepanyan, S. / Stoler, P. / Strakovsky, I. I. / Strauch, S. / Tan, J. A. / Tyler, N. / Ungaro, M. / Venturelli, L. / Voskanyan, H. / Voutier, E. / Watts, D. P. / Wei, X. / Wood, M. H. / Zachariou, N. / Zhang, J. / Zhao, Z. W.

2020

Abstract: We have measured beam-spin asymmetries to extract the $\sin\phi$ moment $A_{LU}^{\sin\phi}$ from the hard exclusive $\vec{e} p \to e^\prime n \pi^+$ reaction above the resonance region, for the first time with nearly full coverage from forward to ... ...

Abstract	We have measured beam-spin asymmetries to extract the $\sin\phi$ moment $A_{LU}^{\sin\phi}$ from the hard exclusive $\vec{e} p \to e^\prime n \pi^+$ reaction above the resonance region, for the first time with nearly full coverage from forward to backward angles in the center-of-mass. The $A_{LU}^{\sin\phi}$ moment has been measured up to 6.6 GeV$^{2}$ in $-t$, covering the kinematic regimes of Generalized Parton Distributions (GPD) and baryon-to-meson Transition Distribution Amplitudes (TDA) at the same time. The experimental results in very forward kinematics demonstrate the sensitivity to chiral-odd and chiral-even GPDs. In very backward kinematics where the TDA framework is applicable, we found $A_{LU}^{\sin\phi}$ to be negative, while a sign change was observed near 90$^\circ$ in the center-of-mass. The unique results presented in this paper will provide critical constraints to establish reaction mechanisms that can help to further develop the GPD and TDA frameworks.
Keywords	Nuclear Experiment ; High Energy Physics - Experiment ; High Energy Physics - Phenomenology
Subject code	612
Publishing date	2020-07-30
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering.

Hattawy, M / Baltzell, N A / Dupré, R / Bültmann, S / De Vita, R / El Alaoui, A / El Fassi, L / Egiyan, H / Girod, F X / Guidal, M / Hafidi, K / Jenkins, D / Liuti, S / Perrin, Y / Stepanyan, S / Torayev, B / Voutier, E / Adhikari, S / Angelini, Giovanni /

Ayerbe Gayoso, C / Barion, L / Battaglieri, M / Bedlinskiy, I / Biselli, A S / Bossù, F / Brooks, W / Cao, F / Carman, D S / Celentano, A / Chatagnon, P / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Crede, V / D'Angelo, A / Dashyan, N / De Sanctis, E / Defurne, M / Deur, A / Diehl, S / Djalali, C / Ehrhart, M / Eugenio, P / Fegan, S / Filippi, A / Forest, T A / Fradi, A / Garçon, M / Gavalian, G / Gevorgyan, N / Gilfoyle, G P / Giovanetti, K L / Golovatch, E / Gothe, R W / Griffioen, K A / Harrison, N / Hauenstein, F / Hayward, T B / Heddle, D / Hicks, K / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Johnston, S / Keller, D / Khachatryan, G / Khachatryan, M / Khanal, A / Khandaker, M / Kim, C W / Kim, W / Klein, F J / Kubarovsky, V / Kuhn, S E / Lanza, L / L Kabir, M / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Markov, N / Mayer, M / McKinnon, B / Meziani, Z E / Mineeva, T / Mirazita, M / Montgomery, R A / Munoz Camacho, C / Nadel-Turonski, P / Niccolai, S / Ostrovidov, A I / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Pogorelko, O / Poudel, J / Prok, Y / Protopopescu, D / Ripani, M / Riser, D / Rizzo, A / Rosner, G / Rossi, P / Sabatié, F / Salgado, C / Schumacher, R A / Sharabian, Y G / Skorodumina, Iu / Sokhan, D / Soto, O / Sparveris, N / Strauch, S / Taiuti, M / Tan, J A / Tyler, N / Ungaro, M / Voskanyan, H / Wang, R / Watts, D P / Wei, X / Weinstein, L B / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2015 Volume 123, Issue 3, Page(s) 32502

Abstract: In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal ... ...

Abstract	In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this Letter, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering off a proton bound in ^{4}He. The data used here were accumulated using a 6 GeV longitudinally polarized electron beam incident on a pressurized ^{4}He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle (ϕ) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The Q^{2}, x_{B}, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20% to 40%, indicating possible medium modification of its partonic structure.
Language	English
Publishing date	2015-09-30
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.123.032502
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Article ; Online: Strangeness suppression of qq creation observed in exclusive reactions.

Mestayer, M D / Park, K / Adhikari, K P / Aghasyan, M / Pereira, S Anefalos / Ball, J / Battaglieri, M / Batourine, V / Bedlinskiy, I / Biselli, A S / Boiarinov, S / Briscoe, W J / Brooks, W K / Burkert, V D / Carman, D S / Celentano, A / Chandavar, S / Charles, G / Colaneri, L /

Cole, P L / Contalbrigo, M / Cortes, O / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Deur, A / Djalali, C / Doughty, D / Dupre, R / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Eugenio, P / Fedotov, G / Fleming, J A / Forest, T A / Garillon, B / Garçon, M / Ghandilyan, Y / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Goetz, J T / Golovatch, E / Gothe, R W / Griffioen, K A / Guegan, B / Guidal, M / Hakobyan, H / Hanretty, C / Hattawy, M / Holtrop, M / Hughes, S M / Hyde, C E / Ilieva, Y / Ireland, D G / Jiang, H / Jo, H S / Joo, K / Keller, D / Khandaker, M / Kim, A / Kim, W / Koirala, S / Kubarovsky, V / Kuleshov, S V / Lenisa, P / Levine, W I / Livingston, K / Lu, H Y / MacGregor, I J D / Mayer, M / McKinnon, B / Meyer, C A / Mirazita, M / Mokeev, V / Montgomery, R A / Moody, C I / Moutarde, H / Movsisyan, A / Camacho, C Munoz / Nadel-Turonski, P / Niccolai, S / Niculescu, G / Niculescu, I / Osipenko, M / Ostrovidov, A I / Pappalardo, L L / Paremuzyan, R / Peng, P / Phelps, W / Pisano, S / Pogorelko, O / Pozdniakov, S / Price, J W / Protopopescu, D / Puckett, A J R / Raue, B A / Rimal, D / Ripani, M / Rizzo, A / Rosner, G / Roy, P / Sabatié, F / Saini, M S / Schott, D / Schumacher, R A / Simonyan, A / Sokhan, D / Strauch, S / Sytnik, V / Tang, W / Tian, Ye / Ungaro, M / Vernarsky, B / Vlassov, A V / Voskanyan, H / Voutier, E / Walford, N K / Watts, D P / Wei, X / Weinstein, L B / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W / Zonta, I

Physical review letters

2014 Volume 113, Issue 15, Page(s) 152004

Abstract: We measured the ratios of electroproduction cross sections from a proton target for three exclusive meson-baryon final states: ΛK(+), pπ(0), and nπ(+), with the CLAS detector at Jefferson Lab. Using a simple model of quark hadronization, we extract qq ... ...

Abstract	We measured the ratios of electroproduction cross sections from a proton target for three exclusive meson-baryon final states: ΛK(+), pπ(0), and nπ(+), with the CLAS detector at Jefferson Lab. Using a simple model of quark hadronization, we extract qq creation probabilities for the first time in exclusive two-body production, in which only a single qq pair is created. We observe a sizable suppression of strange quark-antiquark pairs compared to nonstrange pairs, similar to that seen in high-energy production.
Language	English
Publishing date	2014-10-10
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.113.152004
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Article ; Online: First Exclusive Measurement of Deeply Virtual Compton Scattering off ^{4}He: Toward the 3D Tomography of Nuclei.

Hattawy, M / Baltzell, N A / Dupré, R / Hafidi, K / Stepanyan, S / Bültmann, S / De Vita, R / El Alaoui, A / El Fassi, L / Egiyan, H / Girod, F X / Guidal, M / Jenkins, D / Liuti, S / Perrin, Y / Torayev, B / Voutier, E / Adhikari, K P / Adhikari, S /

Adikaram, D / Akbar, Z / Amaryan, M J / Anefalos Pereira, S / Armstrong, Whitney R / Avakian, H / Ball, J / Bashkanov, M / Battaglieri, M / Batourine, V / Bedlinskiy, I / Biselli, A S / Boiarinov, S / Briscoe, W J / Brooks, W K / Burkert, V D / Thanh Cao, Frank / Carman, D S / Celentano, A / Charles, G / Chetry, T / Ciullo, G / Clark, L / Colaneri, L / Cole, P L / Contalbrigo, M / Cortes, O / Crede, V / D'Angelo, A / Dashyan, N / De Sanctis, E / Deur, A / Djalali, C / Elouadrhiri, L / Eugenio, P / Fedotov, G / Fegan, S / Fersch, R / Filippi, A / Fleming, J A / Forest, T A / Fradi, A / Garçon, M / Gevorgyan, N / Ghandilyan, Y / Gilfoyle, G P / Giovanetti, K L / Gleason, C / Gohn, W / Golovatch, E / Gothe, R W / Griffioen, K A / Guo, L / Hakobyan, H / Hanretty, C / Harrison, N / Heddle, D / Hicks, K / Holtrop, M / Hughes, S M / Ireland, D G / Ishkhanov, B S / Isupov, E L / Jiang, H / Joo, K / Joosten, S / Keller, D / Khachatryan, G / Khachatryan, M / Khandaker, M / Kim, A / Kim, W / Klein, A / Klein, F J / Kubarovsky, V / Kuhn, S E / Kuleshov, S V / Lanza, L / Lenisa, P / Livingston, K / Lu, H Y / MacGregor, I J D / Markov, N / Mayer, M / McCracken, M E / McKinnon, B / Meyer, C A / Meziani, Z E / Mineeva, T / Mirazita, M / Mokeev, V / Montgomery, R A / Moutarde, H / Movsisyan, A / Munoz Camacho, C / Nadel-Turonski, P / Net, L A / Niccolai, S / Niculescu, G / Niculescu, I / Osipenko, M / Ostrovidov, A I / Paolone, M / Paremuzyan, R / Park, K / Pasyuk, E / Phelps, E / Phelps, W / Pisano, S / Pogorelko, O / Price, J W / Prok, Y / Protopopescu, D / Ripani, M / Ritchie, B G / Rizzo, A / Rosner, G / Rossi, P / Sabatié, F / Salgado, C / Schumacher, R A / Seder, E / Sharabian, Y G / Simonyan, A / Skorodumina, Iu / Smith, G D / Sokhan, D / Sparveris, N / Strauch, S / Taiuti, M / Ungaro, M / Voskanyan, H / Walford, N K / Watts, D P / Wei, X / Weinstein, L B / Wood, M H / Zachariou, N / Zana, L / Zhang, J / Zhao, Z W

Physical review letters

2017 Volume 119, Issue 20, Page(s) 202004

Abstract: We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) ...

Abstract	We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment uses the 6 GeV electron beam from the Continuous Electron Beam Accelerator Facility (CEBAF) accelerator at Jefferson Lab incident on a pressurized ^{4}He gaseous target placed in front of the CEBAF Large Acceptance Spectrometer (CLAS). The scattered electron is detected by CLAS and the photon by a dedicated electromagnetic calorimeter at forward angles. To ensure the exclusivity of the process, a specially designed radial time projection chamber is used to detect the recoiling ^{4}He nuclei. We measure beam-spin asymmetries larger than those observed on the free proton in the same kinematic domain. From these, we are able to extract, in a model-independent way, the real and imaginary parts of the only ^{4}He Compton form factor, H_{A}. This first measurement of coherent deeply virtual Compton scattering on the ^{4}He nucleus, with a fully exclusive final state via nuclear recoil tagging, leads the way toward 3D imaging of the partonic structure of nuclei.
Language	English
Publishing date	2017-11-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.119.202004
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Article ; Online: Measurement of single- and double-spin asymmetries in deep inelastic pion electroproduction with a longitudinally polarized target.

Avakian, H / Bosted, P / Burkert, V D / Elouadrhiri, L / Adhikari, K P / Aghasyan, M / Amaryan, M / Anghinolfi, M / Baghdasaryan, H / Ball, J / Battaglieri, M / Bedlinskiy, I / Biselli, A S / Branford, D / Briscoe, W J / Brooks, W / Carman, D S / Casey, L / Cole, P L /

Collins, P / Crabb, D / Crede, V / D'Angelo, A / Daniel, A / Dashyan, N / De Vita, R / De Sanctis, E / Deur, A / Dey, B / Dhamija, S / Dickson, R / Djalali, C / Dodge, G / Doughty, D / Dupre, R / El Alaoui, A / Eugenio, P / Fegan, S / Fersch, R / Forest, T A / Fradi, A / Gabrielyan, M Y / Gavalian, G / Gevorgyan, N / Gilfoyle, G P / Giovanetti, K L / Girod, F X / Gohn, W / Gothe, R W / Griffioen, K A / Guidal, M / Guler, N / Guo, L / Hafidi, K / Hakobyan, H / Hanretty, C / Hassall, N / Heddle, D / Hicks, K / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jawalkar, S S / Jo, H S / Joo, K / Keller, D / Khandaker, M / Khetarpal, P / Kim, W / Klein, A / Klein, F J / Konczykowski, P / Kubarovsky, V / Kuhn, S E / Kuleshov, S V / Kuznetsov, V / Livingston, K / Lu, H Y / Markov, N / Mayer, M / Martinez, D / McAndrew, J / McCracken, M E / McKinnon, B / Meyer, C A / Mineeva, T / Mirazita, M / Mokeev, V / Moreno, B / Moriya, K / Morrison, B / Moutarde, H / Munevar, E / Nadel-Turonski, P / Nasseripour, R / Niccolai, S / Niculescu, G / Niculescu, I / Niroula, M R / Osipenko, M / Ostrovidov, A I / Paremuzyan, R / Park, K / Park, S / Pasyuk, E / Pereira, S Anefalos / Perrin, Y / Pisano, S / Pogorelko, O / Price, J W / Procureur, S / Prok, Y / Protopopescu, D / Raue, B A / Ricco, G / Ripani, M / Rosner, G / Rossi, P / Sabatié, F / Saini, M S / Salamanca, J / Salgado, C / Schumacher, R A / Seder, E / Seraydaryan, H / Sharabian, Y G / Sober, D I / Sokhan, D / Stepanyan, S S / Stepanyan, S / Stoler, P / Strauch, S / Suleiman, R / Taiuti, M / Tedeschi, D J / Tkachenko, S / Ungaro, M / Vernarsky, B / Vineyard, M F / Voutier, E / Watts, D P / Weinstein, L B / Weygand, D P / Wood, M H / Zhang, J / Zhao, B / Zhao, Z W

Physical review letters

2010 Volume 105, Issue 26, Page(s) 262002

Abstract: We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized ... ...

Abstract	We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between lepton scattering and hadron production planes ϕ have been measured over a wide kinematic range in Bjorken x and virtual photon squared four-momentum Q2. A significant nonzero sin2ϕ single spin asymmetry was observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton.
Language	English
Publishing date	2010-12-31
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.105.262002
Database	MEDical Literature Analysis and Retrieval System OnLINE

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