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  1. 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
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. 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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  3. 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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  4. 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
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. 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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