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Article ; Online: First Measurement of Hard Exclusive π^{-}Δ^{++} Electroproduction Beam-Spin Asymmetries off the Proton.

Diehl, S / Trotta, N / Joo, K / Achenbach, P / Akbar, Z / Armstrong, W R / Atac, H / Avakian, H / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biselli, A S / Bossù, F / Brinkmann, K-T /

Briscoe, W J / Bulumulla, D / Burkert, V / Capobianco, R / Carman, D S / Carvajal, J C / Celentano, A / Charles, G / Chatagnon, P / Chesnokov, V / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Deur, A / Djalali, C / Dupre, R / Ehrhart, M / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Filippi, A / Gavalian, G / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Gotra, Y / Griffioen, K / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Illari, I / Ireland, D G / Isupov, E L / Jo, H S / Johnston, R / Keller, D / Khachatryan, M / Khanal, A / Kim, A / Kim, W / Klimenko, V / Kripko, A / Kubarovsky, V / Kuhn, S E / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / MacGregor, I J D / Marchand, D / Mascagna, V / Matousek, G / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V / Moran, P / Munoz Camacho, C / Naidoo, P / Neupane, K / Niccolai, S / Niculescu, G / Osipenko, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Radic, A / Raue, B A / Reed, T / Richards, J / Ripani, M / Ritman, J / Rossi, P / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Sharabian, Y G / Shrestha, U / Sokhan, D / Sparveris, N / Spreafico, M / Stepanyan, S / Strakovsky, I / Strauch, S / Turisini, M / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, X / Williams, R / Wishart, R / Wood, M H / Yurov, M / Zachariou, N / Zhao, Z W / Zurek, M

Physical review letters

2023 Volume 131, Issue 2, Page(s) 21901

Abstract: The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and ... ...

Abstract	The polarized cross-section ratio σ_{LT^{'}}/σ_{0} from hard exclusive π^{-}Δ^{++} electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2 GeV/10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5 GeV^{2} up to 7 GeV^{2}. The reaction provides a novel access to the d-quark content of the nucleon and to p→Δ^{++} transition generalized parton distributions. A comparison to existing results for hard exclusive π^{+}n and π^{0}p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.
Language	English
Publishing date	2023-07-28
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.131.021901
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Article ; Online: Improved Λp Elastic Scattering Cross Sections between 0.9 and 2.0 GeV/c as a Main Ingredient of the Neutron Star Equation of State.

Rowley, J / Compton, N / Djalali, C / Hicks, K / Price, J / Zachariou, N / Adhikari, K P / Armstrong, W R / Atac, H / Baashen, L / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biondo, L / Biselli, A S / Bondi, 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 / Chesnokov, V / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Dupré, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Eugenio, P / Fedotov, G / Fegan, S / Fersch, R / Filippi, A / Fradi, A / Gavalian, G / Girod, F X / Glazier, D I / Golubenko, A / Gothe, R W / Griffioen, K / Guo, L / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Joo, K / Keller, D / Khanal, A / Khandaker, M / Kim, A / Korover, I / Kripko, A / 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 / McCracken, M E / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Mineeva, T / Mirazita, M / Mokeev, V / Munevar, E / Munoz Camacho, C / Nadel-Turonski, P / Neupane, K / Niccolai, S / Niculescu, G / O'Connell, T R / Osipenko, M / Ostrovidov, A I / Pandey, P / Paolone, M / Pappalardo, L L / Pasyuk, E / Pogorelko, O / Prok, Y / Reed, T / Ripani, M / Ritman, J / Rizzo, A / Rosner, G / Sabatie, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Strakovsky, I I / Strauch, S / Tyson, R / Ungaro, M / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, K / Wei, X / Wishart, R / Wood, M H / Yale, B / Yurov, M / Zhang, J / Zhao, Z W

Physical review letters

2022 Volume 127, Issue 27, Page(s) 272303

Abstract: Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering ...

Abstract	Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the neutron star equation of state. Yet, compared to other elastic scattering processes, there is very little data on Λ-N scattering. This experiment utilized the CEBAF Large Acceptance Spectrometer (CLAS) detector to study the Λp→Λp elastic scattering cross section in the incident Λ momentum range 0.9-2.0 GeV/c. These are the first data on this reaction since the 1970s. The new cross sections have significantly better accuracy and precision than the existing world data, and the techniques developed here can also be used in future experiments.
Language	English
Publishing date	2022-01-21
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.127.272303
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First Measurement of Timelike Compton Scattering.

Chatagnon, P / Niccolai, S / Stepanyan, S / Amaryan, M J / Angelini, G / Armstrong, W R / Atac, H / Ayerbe Gayoso, C / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biondo, L / Biselli, A S / Bondi, M / Bossù, F /

Boiarinov, S / Briscoe, W J / Brooks, W K / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Caudron, M / Celentano, A / Chetry, T / Ciullo, G / Clark, L / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / Defurne, M / De Vita, R / Deur, A / Diehl, S / Djalali, C / Dupré, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Fersch, R / Filippi, A / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Girod, F X / Glazier, D I / Golubenko, A A / Gothe, R W / Gotra, Y / Griffioen, K A / Guidal, M / Guo, L / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Hyde, C E / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Joo, K / Kabir, M L / Keller, D / Khachatryan, G / 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 / Marsicano, L / Mascagna, V / McKinnon, B / McLauchlin, C / Migliorati, S / Mirazita, M / Mokeev, V / Montgomery, R A / Munoz Camacho, C / Nadel-Turonski, P / Naidoo, P / Neupane, K / O'Connell, T R / Osipenko, M / Ouillon, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Phelps, W / Pogorelko, O / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Ripani, M / Rizzo, A / Rossi, P / Rowley, J / Sabatié, F / Schmidt, A / Segarra, E P / Sharabian, Y G / Shirokov, E V / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Strakovsky, I I / Strauch, S / Tyler, N / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, K / Wei, X / Wishart, R / Yale, B / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2022 Volume 127, Issue 26, Page(s) 262501

Abstract: We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{*}(γ^{*}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the ... ...

Abstract	We present the first measurement of the timelike Compton scattering process, γp→p^{'}γ^{}(γ^{}→e^{+}e^{-}), obtained with the CLAS12 detector at Jefferson Lab. The photon beam polarization and the decay lepton angular asymmetries are reported in the range of timelike photon virtualities 2.25<Q^{'2}<9 GeV^{2}, squared momentum transferred 0.1<-t<0.8 GeV^{2}, and average total center-of-mass energy squared s=14.5 GeV^{2}. The photon beam polarization asymmetry, similar to the beam-spin asymmetry in deep virtual Compton scattering, is sensitive to the imaginary part of the Compton form factors and provides a way to test the universality of the generalized parton distributions. The angular asymmetry of the decay leptons accesses the real part of the Compton form factors and thus the D-term in the parametrization of the generalized parton distributions.<br />
Language	English
Publishing date	2022-01-14
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.127.262501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Observation of Azimuth-Dependent Suppression of Hadron Pairs in Electron Scattering off Nuclei.

Paul, S J / Morán, S / Arratia, M / El Alaoui, A / Hakobyan, H / Brooks, W / Amaryan, M J / Armstrong, W R / Atac, H / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benkel, B / Benmokhtar, F / Bianconi, A / Biondo, L /

Biselli, A S / Bondi, M / Bossù, F / Boiarinov, S / Brinkmann, K-Th / Briscoe, W J / Bulumulla, D / Burkert, V D / Capobianco, R / Carman, D S / Celentano, A / Chesnokov, V / Chetry, T / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Dilks, C / Djalali, C / Dupre, R / Egiyan, H / El Fassi, L / Eugenio, P / Fegan, S / Filippi, A / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Golubenko, A A / Gosta, G / Gothe, R W / Griffioen, K A / Guidal, M / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Johnston, R / Joo, K / Joosten, S / Keller, D / Khanal, A / Khandaker, M / Kim, W / Kripko, A / Kubarovsky, V / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / McKinnon, B / Meziani, Z E / Migliorati, S / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V I / Moran, P / Munoz Camacho, C / Neupane, K / Nguyen, D / Niccolai, S / Niculescu, G / Osipenko, M / Ostrovidov, A I / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Phelps, W / Pilleux, N / Pocanic, D / Pogorelko, O / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Ripani, M / Rosner, G / Sabatié, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sokhan, D / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Wei, X / Wishart, R / Wood, M H / Zachariou, N / Zhao, Z W / Ziegler, V / Zurek, M

Physical review letters

2022 Volume 129, Issue 18, Page(s) 182501

Abstract: We present the first measurement of dihadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the ... ...

Abstract	We present the first measurement of dihadron angular correlations in electron-nucleus scattering. The data were taken with the CLAS detector and a 5.0 GeV electron beam incident on deuterium, carbon, iron, and lead targets. Relative to deuterium, the nuclear yields of charged-pion pairs show a strong suppression for azimuthally opposite pairs, no suppression for azimuthally nearby pairs, and an enhancement of pairs with large invariant mass. These effects grow with increased nuclear size. The data are qualitatively described by the gibuu model, which suggests that hadrons form near the nuclear surface and undergo multiple scattering in nuclei.These results show that angular correlation studies can open a new way to elucidate how hadrons form and interact inside nuclei.
Language	English
Publishing date	2022-11-01
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.129.182501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First CLAS12 Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries in the Extended Valence Region.

Christiaens, G / Defurne, M / Sokhan, D / Achenbach, P / Akbar, Z / Amaryan, M J / Atac, H / Avakian, H / Gayoso, C Ayerbe / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benkel, B / Benmokhtar, F / Bianconi, A / Biselli, A S /

Bondi, M / Booth, W A / Bossù, F / Boiarinov, S / Brinkmann, K-Th / Briscoe, W J / Bueltmann, S / Bulumulla, D / Burkert, V D / Cao, T / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Chetry, T / Ciullo, G / Clash, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Deur, A / Diehl, S / Dilks, C / Djalali, C / Dupre, R / Egiyan, H / Ehrhart, M / Alaoui, A El / Fassi, L El / Elouadrhiri, L / Fegan, S / Filippi, A / Gates, K / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Girod, F X / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Gotra, Y / Griffioen, K A / Guidal, M / Hafidi, K / Hakobyan, H / Hattawy, M / Hauenstein, F / Hayward, T B / Heddle, D / Hobart, A / Holmberg, D E / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Keller, D / Khachatryan, M / Khanal, A / Kim, W / Kripko, A / Kubarovsky, V / Kuhn, S E / Lagerquist, V / Lanza, L / Kabir, M L / Leali, M / Lee, S / Lenisa, P / Li, X / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / Matousek, G / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V / Molina, E / Camacho, C Munoz / Nadel-Turonski, P / Naidoo, P / Neupane, K / Niccolai, S / Nicol, M / Niculescu, G / Osipenko, M / Ouillon, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Radic, A / Ramasubramanian, N / Raue, B A / Reed, Trevor / Richards, J / Ripani, M / Ritman, J / Rossi, P / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Scott, M B C / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sparveris, N / Spreafico, M / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Trotta, N / Turisini, M / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, X / Williams, R / Wishart, R / Wood, M H / Zachariou, N / Zhang, J / Zhao, Z W / Ziegler, V / Zurek, M

Physical review letters

2023 Volume 130, Issue 21, Page(s) 211902

Abstract: Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 ... ...

Abstract	Deeply virtual Compton scattering (DVCS) allows one to probe generalized parton distributions describing the 3D structure of the nucleon. We report the first measurement of the DVCS beam-spin asymmetry using the CLAS12 spectrometer with a 10.2 and 10.6 GeV electron beam scattering from unpolarized protons. The results greatly extend the Q^{2} and Bjorken-x phase space beyond the existing data in the valence region and provide 1600 new data points measured with unprecedented statistical uncertainty, setting new, tight constraints for future phenomenological studies.
Language	English
Publishing date	2023-05-26
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.130.211902
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: First Measurement of Λ Electroproduction off Nuclei in the Current and Target Fragmentation Regions.

Chetry, T / El Fassi, L / Brooks, W K / Dupré, R / El Alaoui, A / Hafidi, K / Achenbach, P / Adhikari, K P / Akbar, Z / Armstrong, W R / Arratia, M / Atac, H / Avakian, H / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I /

Benkel, B / Benmokhtar, F / Bianconi, A / Biselli, A S / Bondi, M / Booth, W A / Bossù, F / Boiarinov, S / Brinkmann, K-Th / Briscoe, W J / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Djalali, C / Egiyan, H / Elouadrhiri, L / Eugenio, P / Fegan, S / Filippi, A / Gavalian, G / Ghandilyan, Y / Gilfoyle, G P / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Griffioen, K A / Guidal, M / Guo, L / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Hobart, A / Holtrop, M / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Kabir, M L / Khanal, A / Khandaker, M / Kim, A / Kim, W / Klein, F J / Kripko, A / Kubarovsky, V / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / McKinnon, B / McLauchlin, C / Meziani, Z E / Migliorati, S / Mineeva, T / Mirazita, M / Mokeev, V / Munoz Camacho, C / Nadel-Turonski, P / Neupane, K / Niccolai, S / Nicol, M / Niculescu, G / Osipenko, M / Ostrovidov, A I / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Paul, S J / Phelps, W / Pilleux, N / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Richards, J / Ripani, M / Ritman, J / Rosner, G / Sabatié, F / Salgado, C / Schadmand, S / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sokhan, D / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Trotta, N / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Voutier, E / Wei, X / Weinstein, L B / Williams, R / Wishart, R / Wood, M H / Yurov, M / Zachariou, N / Zhao, Z W / Zurek, M

Physical review letters

2023 Volume 130, Issue 14, Page(s) 142301

Abstract: We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These ... ...

Abstract	We report results of Λ hyperon production in semi-inclusive deep-inelastic scattering off deuterium, carbon, iron, and lead targets obtained with the CLAS detector and the Continuous Electron Beam Accelerator Facility 5.014 GeV electron beam. These results represent the first measurements of the Λ multiplicity ratio and transverse momentum broadening as a function of the energy fraction (z) in the current and target fragmentation regions. The multiplicity ratio exhibits a strong suppression at high z and an enhancement at low z. The measured transverse momentum broadening is an order of magnitude greater than that seen for light mesons. This indicates that the propagating entity interacts very strongly with the nuclear medium, which suggests that propagation of diquark configurations in the nuclear medium takes place at least part of the time, even at high z. The trends of these results are qualitatively described by the Giessen Boltzmann-Uehling-Uhlenbeck transport model, particularly for the multiplicity ratios. These observations will potentially open a new era of studies of the structure of the nucleon as well as of strange baryons.
Language	English
Publishing date	2023-04-21
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.130.142301
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Article ; Online: Photoproduction of the f_{2}(1270) Meson Using the CLAS Detector.

Carver, M / Celentano, A / Hicks, K / Marsicano, L / Mathieu, V / Pilloni, A / Adhikari, K P / 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 / Bondi, M /

Bossù, F / Boiarinov, S / Briscoe, W J / Brooks, W K / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Chatagnon, P / Chetry, T / Ciullo, G / Clark, L / Clary, B A / Cole, P L / Contalbrigo, M / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Djalali, C / Dugger, M / Dupre, R / Egiyan, H / Ehrhart, M / Alaoui, A El / Fassi, L El / Eugenio, P / Fedotov, G / Fegan, S / Filippi, A / Gavalian, G / Gevorgyan, N / Gilfoyle, G P / Girod, F X / Gothe, R W / Griffioen, K A / Hafidi, K / Hakobyan, H / Hattawy, M / Hayward, T B / Heddle, D / Holtrop, M / Huang, Q / Hyde, C E / Ilieva, Y / Ireland, D G / Isupov, E L / Jenkins, D / Jo, H S / Joo, K / Joosten, S / Keller, D / Khanal, A / Khandaker, M / Kim, A / Kim, C W / Klein, F J / Kripko, A / Kubarovsky, V / Lanza, L / Leali, M / Lenisa, P / Livingston, K / MacGregor, I J D / Marchand, D / Mascagna, V / McCracken, M E / McKinnon, B / Meziani, Z E / Mokeev, V / Movsisyan, A / Munevar, E / Camacho, C Munoz / Nadel-Turonski, P / Neupane, K / Niccolai, S / Niculescu, G / Osipenko, M / Ostrovidov, A I / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Phelps, W / Pogorelko, O / Prok, Y / Protopopescu, D / Ripani, M / Ritchie, B G / Ritman, J / Rizzo, A / Rosner, G / Rowley, J / Sabatié, F / Salgado, C / Schmidt, A / Schumacher, R A / Sharabian, Y G / Shrestha, U / Sokhan, D / Soto, O / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tyler, N / Tyson, R / Ungaro, M / Venturelli, L / Voskanyan, H / Voutier, E / Watts, D P / Wei, K / Wei, X / Yale, B / Zachariou, N / Zhang, J / Zhao, Z W

Physical review letters

2021 Volume 126, Issue 8, Page(s) 82002

Abstract: The quark structure of the f_{2}(1270) meson has, for many years, been assumed to be a pure quark-antiquark (qq[over ¯]) resonance with quantum numbers J^{PC}=2^{++}. Recently, it was proposed that the f_{2}(1270) is a molecular state made from the ... ...

Abstract	The quark structure of the f_{2}(1270) meson has, for many years, been assumed to be a pure quark-antiquark (qq[over ¯]) resonance with quantum numbers J^{PC}=2^{++}. Recently, it was proposed that the f_{2}(1270) is a molecular state made from the attractive interaction of two ρ mesons. Such a state would be expected to decay strongly to final states with charged pions due to the dominant decay ρ→π^{+}π^{-}, whereas decay to two neutral pions would likely be suppressed. Here, we measure for the first time the reaction γp→π^{0}π^{0}p, using the CEBAF Large Acceptance Spectrometer detector at Jefferson Lab for incident beam energies between 3.6 and 5.4 GeV. Differential cross sections, dσ/dt, for f_{2}(1270) photoproduction are extracted with good precision due to low backgrounds and are compared to theoretical calculations.
Language	English
Publishing date	2021-03-12
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.126.082002
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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
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Multidimensional, High Precision Measurements of Beam Single Spin Asymmetries in Semi-inclusive π^{+} Electroproduction off Protons in the Valence Region.

Diehl, S / Kim, A / Angelini, G / Joo, K / Adhikari, S / Amaryan, M / Arratia, M / Atac, H / Avakian, H / Ayerbe Gayoso, C / Baltzell, N A / Barion, L / Bastami, S / Battaglieri, M / Bedlinskiy, I / Benmokhtar, F / Bianconi, A / Biselli, A S / Bondi, M /

Bossù, F / Boiarinov, S / Brinkmann, K-T / Briscoe, W J / Brooks, W / Bulumulla, D / Burkert, V D / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chetry, T / Ciullo, G / Clark, L / Clary, B A / Cole, P L / Contalbrigo, M / Costantini, G / Crede, V / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Dilks, C / Djalali, C / Dugger, M / Dupre, R / Egiyan, H / Ehrhart, M / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Filippi, A / Forest, T / 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 / Hayward, T B / Heddle, D / Hicks, K / Hobart, A / Holtrop, M / Hyde, C E / Ireland, D G / Isupov, E L / Jo, H S / Johnston, R / Joosten, S / Keller, D / Khachatryan, M / Khanal, A / Kim, W / Kripko, A / Kubarovsky, V / Kuhn, S E / Lanza, L / Leali, M / Lee, S / Lenisa, P / Livingston, K / Lu, Z / MacGregor, I J D / Marchand, D / Markov, N / Marsicano, L / Mascagna, V / McKinnon, B / Meziani, Z E / Milner, R G / Mineeva, T / Mirazita, M / Mokeev, V / Moran, P / 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 / Prokudin, A / Raue, B A / Ripani, M / Ritman, J / Rizzo, A / Roberts, C D / Rossi, P / Rowley, J / Sabatié, F / Salgado, C / Schmidt, A / Segarra, E P / Sharabian, Y G / Shrestha, U / Simmerling, P / Sokhan, D / Soto, O / Sparveris, N / Stepanyan, S / Stoler, P / Strakovsky, I I / Strauch, S / Tezgin, K / Thornton, A / Tyler, N / Tyson, R / Ungaro, M / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, K / Wei, X / Xu, S-S / Yale, B / Zachariou, N / Zhang, J

Physical review letters

2022 Volume 128, Issue 6, Page(s) 62005

Abstract: High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We ... ...

Abstract	High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6 GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. We report here a high precision multidimensional study of single π^{+} SIDIS data over a large kinematic range in Bjorken x, fractional energy, and transverse momentum of the hadron as well as photon virtualities Q^{2} ranging from 1-7 GeV^{2}. In particular, the structure function ratio F_{LU}^{sinϕ}/F_{UU} has been determined, where F_{LU}^{sinϕ} is a twist-3 quantity that can reveal novel aspects of emergent hadron mass and quark-gluon correlations within the nucleon. The data's impact on the evolving understanding of the underlying reaction mechanisms and their kinematic variation is explored using theoretical models for the different contributing transverse momentum dependent parton distribution functions.
Language	English
Publishing date	2022-02-25
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.128.062005
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Observation of Correlations between Spin and Transverse Momenta in Back-to-Back Dihadron Production at CLAS12.

Avakian, H / Hayward, T B / Kotzinian, A / Armstrong, W R / Atac, H / Ayerbe Gayoso, C / Baashen, L / Baltzell, N A / Barion, L / Bashkanov, M / Battaglieri, M / Bedlinskiy, I / Benkel, B / Benmokhtar, F / Bianconi, A / Biondo, L / Biselli, A S / Bondi, M / Boiarinov, S /

Bossù, F / Brinkman, K T / Briscoe, W J / Brooks, W K / Bueltmann, S / Bulumulla, D / Burkert, V D / Capobianco, R / Carman, D S / Carvajal, J C / Celentano, A / Chatagnon, P / Chesnokov, V / Chetry, T / Ciullo, G / Cole, P L / Contalbrigo, M / Costantini, G / D'Angelo, A / Dashyan, N / De Vita, R / Defurne, M / Deur, A / Diehl, S / Dilks, C / Djalali, C / Dupre, R / Egiyan, H / El Alaoui, A / El Fassi, L / Elouadrhiri, L / Fegan, S / Filippi, A / Forest, T / Gates, K / Gavalian, G / Ghandilyan, Y / Glazier, D I / Golubenko, A A / Gosta, G / Gothe, R W / Gotra, Y / Griffioen, K A / Guidal, M / Hakobyan, H / Hattawy, M / Hauenstein, F / Heddle, D / Hobart, A / Holtrop, M / Hyde, C E / Ilieva, Y / Ireland, D G / Isupov, E L / Jo, H S / Johnston, R / Joo, K / Kabir, M L / Keller, D / Khachatryan, M / Khanal, A / Kim, A / Kim, W / Klimenko, V / Kripko, A / Kubarovsky, V / Kuhn, S E / Lagerquist, V / Lanza, L / Leali, M / Lee, S / Lenisa, P / Li, X / MacGregor, I J D / Marchand, D / Mascagna, V / McKinnon, B / Migliorati, S / Mineeva, T / Mirazita, M / Mokeev, V / Montgomery, R A / Munoz Camacho, C / Nadel-Turonski, P / Naidoo, P / Neupane, K / Nguyen, D / Niccolai, S / Nicol, M / Niculescu, G / Osipenko, M / Pandey, P / Paolone, M / Pappalardo, L L / Paremuzyan, R / Pasyuk, E / Paul, S J / Phelps, W / Pilleux, N / Pogorelko, O / Pokhrel, M / Poudel, J / Price, J W / Prok, Y / Raue, B A / Reed, T / Richards, J / Ripani, M / Ritman, J / Rossi, P / Sabatié, F / Salgado, C / Schmidt, A / Sharabian, Y G / Shirokov, E V / Shrestha, U / Simmerling, P / Sokhan, D / Sparveris, N / Stepanyan, S / Strakovsky, I I / Strauch, S / Tan, J A / Trotta, N / Tyson, R / Ungaro, M / Vallarino, S / Venturelli, L / Voskanyan, H / Vossen, A / Voutier, E / Watts, D P / Wei, X / Wishart, R / Wood, M H / Zachariou, N / Zhao, Z W / Zurek, M

Physical review letters

2022 Volume 130, Issue 2, Page(s) 22501

Abstract: We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction in the deep inelastic scattering process. In this reaction, two hadrons are produced in opposite hemispheres ... ...

Abstract	We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction in the deep inelastic scattering process. In this reaction, two hadrons are produced in opposite hemispheres along the z axis in the virtual photon-target nucleon center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed nonzero sinΔϕ modulations in ep→e^{'}pπ^{+}X events, where Δϕ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unexplored leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.
Language	English
Publishing date	2022-04-01
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.130.022501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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