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175 results on '"Nikonov, V.A."'

1. Observation of a cusp-like structure in the γp → K+Σ0 cross section at forward angles and low momentum transfer

Author

Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V.A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.-E., Romaniuk, M., Sarantsev, A.V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Published
2021
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2. Observation of a cusp-like structure in the → Σ Cross Section at Forward Angles and low Momentum Transfer

Author

Jude, T.C., Alef, S., Bauer, P., Bayadilov, D., Beck, R., Bella, A., Bieling, J., Braghieri, A., Cole, P.L., Elsner, D., Di Salvo, R., Fantini, A., Freyermuth, O., Frommberger, F., Ghio, F., Goertz, S., Gridnev, A., Hammann, D., Hannappel, J., Kohl, K., Kozlenko, N., Lapik, A., Levi Sandri, P., Lisin, V., Mandaglio, G., Messi, F., Messi, R., Moricciani, D., Nedorezov, V., Nikonov, V.A., Novinskiy, D., Pedroni, P., Polonskiy, A., Reitz, B.E., Romaniuk, M., Sarantsev, A.V., Scheluchin, G., Schmieden, H., Stuglev, A., Sumachev, V., Vegna, V., Tarakanov, V., and Zimmermann, T.

Abstract

The γp→K+Σ0 differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the K+ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900 MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.

Published
2021

3. Beam–target helicity asymmetry E in K+Σ− photoproduction on the neutron

Author

Zachariou, N., Watts, D.P., Fleming, J., Sarantsev, A.V., Nikonov, V.A., D'Angelo, A., Bashkanov, M., Hanretty, C., Kageya, T., Klein, F.J., Lowry, M., Lu, H., Sandorfi, A., Wei, X., Zonta, I., Adhikari, K.P., Adhikari, S., Amaryan, M.J., Angelini, G., Asryan, G., Atac, H., Barion, L., Bass, C., 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., Carman, D.S., Carvajal, J.C., Celentano, A., Charles, G., Chatagnon, P., Chetry, T., Ciullo, G., Cole, P.L., Contalbrigo, M., Dashyan, N., De Vita, R., Deur, A., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., Eugenio, P., Fegan, S., Fersch, R., Filippi, A., Gavalian, G., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G.P., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hattawy, M., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Joo, K., Joosten, S.J., Keller, D., Khachatryan, M., Khanal, A., Khandaker, M., Kim, C.W., Kim, W., Kubarovsky, V., Lanza, L., Leali, M., Lenisa, P., Livingston, K., MacGregor, I.J.D., Marchand, D., Markov, N., Marsicano, L., Mascagna, V., Mayer, M., McKinnon, B., Meziani, Z.E., Mineeva, T., Mokeev, V., Munevar, E., Munoz Camacho, C., Nadel Turonski, P., O'Connell, T.R., Osipenko, M., Ostrovidov, A.I., Paolone, M., Pappalardo, L.L., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pogorelko, O., Poudel, J., Price, J.W., Prok, Y., Puckett, A.J.R., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Salgado, C., Schmidt, A., Schumacher, R.A., Shrestha, U., Sokhan, D., Soto, O., Sparveris, N., Strakovsky, I.I., Strauch, S., Tan, J.A., Tyler, N., Ungaro, M., Venturelli, L., Voskanyan, H., Voutier, E., Walford, N.K., Whisnant, C.S., Wood, M.H., Zhang, J., and Zhao, Z.W.

Published
2020
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8. Beam-Target Helicity Asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ Photoproduction on the Neutron

Author

Ho , D.H., Schumacher , R.A., D'Angelo , A., Deur , A., Fleming , J., Hanretty , C., Kageya , T., Klein , F.J., Klempt , E., Lowry , M.M., Lu , H., Nikonov , V.A., Peng , P., Sandorfi , A.M., Sarantsev , A.V., Strakovsky , I.I., Walford , N.K., Wei , X., Workman , R.L., Adhikari , K.P., Adhikari , S., Adikaram , D., Akbar , Z., Ball , J., Barion , L., Bashkanov , M., Battaglieri , M., Bedlinskiy , I., Biselli , A.S., Briscoe , W.J., Boiarinov , S., Burkert , V.D., Cao , F., Carman , D.S., Celentano , A., Chandavar , S., Charles , G., Chatagnon , P., Chetry , T., Ciullo , G., Clary , B.A., Cole , P., Contalbrigo , M., Crede , V., De Vita , R., Defurne , M., Diehl , S., Djalali , C., Dupre , R., Egiyan , H., Ehrhart , M., El Alaoui , A., El Fassi , L., Eugenio , P., Fedotov , G., Fegan , S., Fersch , R., Filippi , A., Fradi , A., Ghandilyan , Y., Giovanetti , K.L., Girod , F.X., Gohn , W., Golovatch , E., Gothe , R.W., Griffioen , K.A., Guidal , M., Hafidi , K., Hakobyan , H., Harrison , N., Hattawy , M., Heddle , D., Hicks , K., Holtrop , M., Ilieva , Y., Ireland , D.G., Ishkhanov , B.S., Isupov , E.L., Jenkins , D., Jo , H.S., Johnston , S., Kabir , M.L., Keller , D., Khachatryan , G., Khachatryan , M., Khandaker , M., Kim , A., Kim , W., Klein , A., Kubarovsky , V., Laine , V., Lanza , L., Lenisa , P., Livingston , K., MacGregor , I, Marchand , D., Markov , N., Mayer , M., Mckinnon , B., Meyer , C.A., Mirazita , M., Mokeev , V., Montgomery , R.A., Movsisyan , A, Munoz Camacho , C., Nadel-Turonski , P., Niccolai , S., Niculescu , G., O'Connell , T., Osipenko , M., Ostrovidov , A.I., Paolone , M., Paremuzyan , R., Park , K., Pasyuk , E., Pogorelko , O., Price , J.W., Prok , Y., Protopopescu , D., Rehfuss , M., Ripani , M., Riser , D., Rizzo , A., Rosner , G., Sabatié , F., Salgado , C., Sharabian , Y.G., Skorodumina , Iu., Smith , G.D., Sober , D.I., Sokhan , D., Sparveris , N., Strauch , S., Taiuti , M., Tan , J.A., Ungaro , M., Voskanyan , H., Voutier , E., Wang , R., Watts , D.P., Weinstein , L.B., Wood , M.H., Zachariou , N., Zhang , J., Zhao , Z.W., Zonta , I., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de Clermont ( LPC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), and CLAS

Subjects
Automatic Keywords, isospin, solids, background: low, pseudoscalar meson: photoproduction, CLAS, hydrogen, Nuclear Theory, helicity: asymmetry, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, photon: beam, Jefferson Lab
Abstract

We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec{\gamma} \vec{n} \to K^{0}\Lambda$, and $K^{0}\Sigma^{0}$ channels in the energy range of 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab used a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride (HD) with low background contamination for the measurements. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin $I=0$ and $I=1$ photo-coupling transition amplitudes in pseudoscalar meson photoproduction.

Published
2018

9. Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory

Author

Roy , P., Akbar , Z., Park , S., Crede , V., Anisovich , A.V., Denisenko , I., Klempt , E., Nikonov , V.A., Sarantsev , A.V., Adhikari , K.P., Adhikari , S., Anefalos Pereira , S., Ball , J., Balossino , I., Bashkanov , M., Battaglieri , M., Batourine , V., Bedlinskiy , I., Biselli , A.S., Boiarinov , S., Briscoe , W.J., Brock , J., Brooks , W.K., Carlin , C., Carman , D.S., Celentano , A., Charles , G., Chetry , T., Ciullo , G., Clary , B.A., Cole , P.L., Contalbrigo , M., D'Angelo , A., Dashyan , N., De Vita , R., Deur , A., Djalali , C., Dugger , M., Dupre , R., El Alaoui , A., El Fassi , L., Elouadrhiri , L., Eugenio , P., Fedotov , G., Fegan , S., Filippi , A., Fradi , A., Gavalian , G., Gevorgyan , N., Gilfoyle , G.P., Giovanetti , K.L., Girod , F.X., Gleason , C., Gohn , W., Golovatch , E., Gothe , R.W., Griffioen , K.A., Guidal , M., Guo , L., Hafidi , K., Hakobyan , H., Hanretty , C., Hattawy , M., Hicks , K., Holtrop , M., Ilieva , Y., Ireland , D.G., Ishkhanov , B.S., Isupov , E.L., Jenkins , D., Joo , K., Joosten , S., Keith , C.D., Keller , D., Khachatryan , G., Khandaker , M., Kim , A., Kim , W., Klein , A., Klein , F.J., Kubarovsky , V., 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., Meekins , D.G., Meyer , C.A., Meziani , Z.E., Mineeva , T., Mokeev , V., Montgomery , R.A., Movsisyan , A, Munoz Camacho , C., Nadel-Turonski , P., Niccolai , S., Niculescu , G., Osipenko , M., Ostrovidov , A.I., Paremuzyan , R., Park , K., Pasyuk , E., Phelps , E., Phelps , W., Pierce , J.J., Pogorelko , O., Price , J.W., Procureur , S., Prok , Y., Protopopescu , D., Raue , B.A., Ripani , M., Riser , D., Ritchie , B.G., Rizzo , A., Rosner , G., Sabatié , F., Salgado , C., Schumacher , R.A., Sharabian , Y.G., Skorodumina , Iu., Smith , G.D., Sober , D.I., Sokhan , D., Sparveris , N., Stepanyan , S., Strakovsky , I.I., Strauch , S., Taiuti , M., Tan , J.A., Torayev , B., Ungaro , M., Voutier , E., Watts , D.P., Wei , X., Wood , M.H., Zachariou , N., Zhang , J., Zhao , Z.W., Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), and CLAS

Subjects
accelerator, partial wave analysis, meson, Automatic Keywords, beam: asymmetry, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], CLAS, High Energy Physics::Experiment, target: asymmetry, data management, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, resonance: production, photoproduction
Abstract

International audience; The photoproduction of ω mesons off the proton has been studied in the reaction γp→pω using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay ω→π+π−π0, using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30–40% in the third-resonance region. New measurements for the photon-beam asymmetry Σ are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional ω photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.

Published
2018

10. Measurement of the beam asymmetry $\Sigma$ and the target asymmetry $T$ in the photoproduction of $\omega$ mesons off the proton using CLAS at Jefferson Laboratory

Author

Roy, P., Akbar, Z., Park, S., Crede, V., Anisovich, A.V., Denisenko, I., Klempt, E., Nikonov, V.A., Sarantsev, A.V., Adhikari, K.P., Adhikari, S., Anefalos Pereira, S., Ball, J., Balossino, I., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brock, J., Brooks, W.K., Burkert, V.D., Carlin, C., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clary, B.A., Cole, P.L., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dugger, M., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fradi, A., Gavalian, G., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hattawy, M., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Joo, K., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., 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., Meekins, D.G., Meyer, C.A., Meziani, Z.E., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pierce, J.J., Pogorelko, O., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Riser, D., Ritchie, B.G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Torayev, B., Ungaro, M., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., Zhao, Z.W., Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11), CLAS, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), and Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
pomeron: exchange, beam: polarization, accelerator, helicity: asymmetry, partial wave analysis, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], photon: energy spectrum, meson, High Energy Physics - Experiment, Automatic Keywords, beam: asymmetry, meson: photoproduction, meson: exchange, CLAS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], n: target, High Energy Physics::Experiment, target: asymmetry, data management, Nuclear Experiment, experimental results, resonance: production, photoproduction
Abstract

The photoproduction of $\omega$ mesons off the proton has been studied in the reaction $\gamma p\to p\,\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (FROST) in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry, $T$, has been measured in photoproduction from the decay $\omega\to\pi^+\pi^-\pi^0$, using a transversely-polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant non-zero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry, $\Sigma$, are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional $\omega$-photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from $s$-channel resonance production were found in addition to $t$-channel exchange processes., Comment: 15 pages, 10 figures, author list and references updated

Published
2018

11. Beam-target helicity asymmetry $E$ in $K^{0}\Lambda$ and $K^{0}\Sigma^0$ photoproduction on the neutron

Author

Ho, D.H., Schumacher, R.A., d'Angelo, A., Deur, A., Fleming, J., Hanretty, C., Kageya, T., Klein, F.J., Klempt, E., Lowry, M.M., Lu, H., Nikonov, V.A., Peng, P., Sandorfi, A.M., Sarantsev, A.V., Strakovsky, I.I., Walford, N.K., Wei, X., Workman, R.L., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Ball, J., Barion, L., Bashkanov, M., Bass, C.D., Battaglieri, M., Bedlinskiy, I., Biselli, A.S., Briscoe, W.J., Boiarinov, S., Burkert, V.D., Cao, F., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Chatagnon, P., Chetry, T., Ciullo, G., Clary, B.A., Cole, P., Collins, P., Contalbrigo, M., Crede, V., de Vita, R., Defurne, M., Diehl, S., Djalali, C., Dupre, R., Egiyan, H., Ehrhart, M., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fradi, A., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Johnston, S., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Kubarovsky, V., Laine, V., Lanza, L., Lenisa, P., Livingston, K., Macgregor, I.. J . D., Marchand, D., Markov, N., Mayer, M., Mckinnon, B., Meyer, C.A., Mirazita, M., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., O'Connell, T., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Rehfuss, M., Ripani, M., Riser, D., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Strauch, S., Taiuti, M., Tan, J.A., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Watts, D.P., Weinstein, L.B., Whisnant, C.S., Wood, M.H., Zachariou, N., Zhang, J., Zhao, Z.W., Zonta, I., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, Hadronic Physics and QCD, helicity: asymmetry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], beam: asymmetry, isospin, Automatic Keywords, solids, background: low, pseudoscalar meson: photoproduction, CLAS, hydrogen, differential cross section, n: target, isospin: dependence, Nuclear Experiment, photon: beam, experimental results, hydrogen: target, Jefferson Lab
Abstract

We report the first measurements of the $E$ beam-target helicity asymmetry for the $\vec{\gamma} \vec{n} \to K^{0}\Lambda$, and $K^{0}\Sigma^{0}$ channels in the energy range 1.70$\leq W\leq$2.34 GeV. The CLAS system at Jefferson Lab uses a circularly polarized photon beam and a target consisting of longitudinally polarized solid molecular hydrogen deuteride with low background contamination for the measurements. The multivariate analysis method boosted decision trees was used to isolate the reactions of interest. Comparisons with predictions from the KaonMAID, SAID, and Bonn-Gatchina models are presented. These results will help separate the isospin $I=0$ and $I=1$ photo-coupling transition amplitudes in pseudoscalar meson photoproduction., Comment: 14 pages, 9 figures; Revised to match published version

Published
2018

12. Photon beam asymmetry Σ in the reaction [formula omitted] for Eγ = 1.152 to 1.876 GeV

Author

Collins, P., Ritchie, B.G., Dugger, M., Klein, F.J., Anisovich, A.V., Klempt, E., Nikonov, V.A., Sarantsev, A., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N.A., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, Frank Thanh, Cao, T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fleming, J.A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., 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, W., Pisano, S., Pogorelko, O., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Published
2017
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14. Photon beam asymmetry Σ for η and η′ photoproduction from the proton

Author

Collins, P., Ritchie, B.G., Dugger, M., Anisovich, A.V., Döring, M., Klempt, E., Nikonov, V.A., Rönchen, D., Sadasivan, D., Sarantsev, A., Adhikari, K.P., Akbar, Z., Amaryan, M.J., Anefalos Pereira, S., Avakian, H., Ball, J., Balossino, I., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Biselli, A.S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, Frank Thanh, Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P.L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J.A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Mirazita, M., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Roy, P., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Wei, X., Zachariou, N., and Zhang, J.

Published
2017
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15. Differential cross sections and polarization observables from CLAS K⁎ photoproduction and the search for new N⁎ states

Author

Anisovich, A.V., Hicks, K., Klempt, E., Nikonov, V.A., Sarantsev, A., Tang, W., Adikaram, D., Akbar, Z., Amaryan, M.J., Anefalos Pereira, S., Badui, R.A., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Briscoe, W.J., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Compton, N., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J.A., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Gleason, C., Gothe, R.W., Griffioen, K.A., Guo, L., Hanretty, C., Harrison, N., Hattawy, M., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, W., Klein, F.J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Mirazita, M., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Net, L.A., Ni, A., Niccolai, S., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J.W., Prok, Y., Puckett, A.J.R., Raue, B.A., Ripani, M., Ritchie, B.G., Rosner, G., Roy, P., Sabatié, F., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strauch, S., Sytnik, V., Tian, Ye., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wood, M.H., Zachariou, N., Zhang, J., and Zonta, I.

Published
2017
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16. Data on Is and Ic in γ→p→pπ0π0 reveal cascade decays of N(1900) via N(1520)π

Author

Sokhoyan, V., Gutz, E., van Pee, H., Anisovich, A.V., Bacelar, J.C.S., Bantes, B., Bartholomy, O., Bayadilov, D., Beck, R., Beloglazov, Y., Castelijns, R., Crede, V., Dutz, H., Elsner, D., Ewald, R., Frommberger, F., Fuchs, M., Funke, Ch., Gregor, R., Gridnev, A., Hillert, W., Hoffmeister, Ph., Horn, I., Jaegle, I., Junkersfeld, J., Kalinowsky, H., Kammer, S., Kleber, V., Klein, Frank, Klein, Friedrich, Klempt, E., Kotulla, M., Krusche, B., Lang, M., Löhner, H., Lopatin, I., Lugert, S., Mertens, T., Messchendorp, J.G., Metag, V., Nanova, M., Nikonov, V.A., Novinski, D., Novotny, R., Ostrick, M., Pant, L., Pfeiffer, M., Piontek, D., Roy, A., Sarantsev, A.V., Schmidt, Ch., Schmieden, H., Shende, S., Süle, A., Sumachev, V.V., Szczepanek, T., Thiel, A., Thoma, U., Trnka, D., Varma, R., Walther, D., Wendel, Ch., and Wilson, A.

Subjects
Nuclear and High Energy Physics
Published
2015
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18. Photon beam asymmetry Σ in the reaction γ→p → pω for Eγ = 1.152 to 1.876 GeV

Author

Collins, P., Ritchie, B.G., Dugger, M., Klein, F.J., Anisovich, A.V., Klempt, E., Nikonov, V.A., Sarantsev, A., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N.A., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, Frank Thanh, Cao, T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fleming, J.A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., 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, W., Pisano, S., Pogorelko, O., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Subjects
Nuclear Experiment
Abstract

Photon beam asymmetry Σ measurements for ω photoproduction in the reaction γ→p→ωp are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between t-channel meson exchange and s- and u-channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn–Gatchina partial-wave analysis indicate the Σ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the JP=3/2+ partial wave), as well as the resonant portions of the smaller partial waves with JP=1/2−, 3/2−, and 5/2+.

Published
2017

19. Photon beam asymmetry Σ in the reaction γ→p→pω for E γ = 1.152 to 1.876 GeV

Author

Collins, P., Ritchie, B.G., Dugger, M., Klein, F.J., Anisovich, A.V., Klempt, E., Nikonov, V.A., Sarantsev, A., Adhikari, K.P., Adhikari, S., Adikaram, D., Akbar, Z., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N.A., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Cao, Frank Thanh, Cao, T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fleming, J.A., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Meyer, C.A., Meziani, Z.E., Mineeva, T., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., 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, W., Pisano, S., Pogorelko, O., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zhang, J., and Zhao, Z.W.

Subjects
Nuclear Experiment
Abstract

Photon beam asymmetry Σ measurements for ω photoproduction in the reaction γ→p→ωp are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using a linearly-polarized tagged photon beam, a cryogenic hydrogen target, and the CLAS spectrometer in Hall B at Jefferson Lab. The measurements obtained markedly increase the size of the database for this observable, extend coverage to higher energies, and resolve discrepancies in previously published data. Comparisons of these new results with predictions from a chiral-quark-based model and from a dynamical coupled-channels model indicate the importance of interferences between t -channel meson exchange and s - and u -channel contributions, underscoring sensitivity to the nucleon resonances included in those descriptions. Comparisons with the Bonn–Gatchina partial-wave analysis indicate the Σ data reported here help to fix the magnitudes of the interference terms between the leading amplitudes in that calculation (Pomeron exchange and the resonant portion of the JP=3/2+ partial wave), as well as the resonant portions of the smaller partial waves with JP=1/2− , 3/2− , and 5/2+ .

Published
2017

20. Measurement of the helicity asymmetry $E$ in $\omega\to\pi^+\pi^-\pi^0$ photoproduction

Author

Akbar, Z., Roy, P., Park, S., Crede, V., Anisovich, A.V., Denisenko, I., Klempt, E., Nikonov, V.A., Sarantsev, A.V., Adhikari, K.P., Adhikari, S., Amaryan, M.J., Anefalos Pereira, S., Avakian, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Boiarinov, S., Briscoe, W.J., Brock, J., Brooks, W.K., Burkert, V.D., Cao, F.T., Carlin, C., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fradi, A., Garçon, M., Gevorgyan, N., Giovanetti, K.L., Girod, F.X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Lanza, L., Livingston, K., Macgregor, I.J.D., Markov, N., Mckinnon, B., Meekins, D.G., Mineeva, T., Mokeev, V., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
experimental methods, meson: decay modes, N(1720), magnetic field, nucleon resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], bremsstrahlung, tagged beam, High Energy Physics - Experiment, p: target, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], CLAS, threshold, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], electron: beam, 1.1-2.3 GeV, pi: mass spectrum, Nuclear Experiment, photon: beam, pomeron: exchange, polarization, background, pi: exchange, helicity: asymmetry, partial wave analysis, covariance, particle identification, experimental results, Jefferson Lab, photoproduction
Abstract

The double-polarization observable $E$ was studied for the reaction $\gamma p\to p\omega$ using the CEBAF Large Acceptance Spectrometer (CLAS) in Hall B at the Thomas Jefferson National Accelerator Facility and the longitudinally-polarized frozen-spin target (FROST). The observable was measured from the charged decay mode of the meson, $\omega\to\pi^+\pi^-\pi^0$, using a circularly-polarized tagged-photon beam with energies ranging from the $\omega$ threshold at 1.1 to 2.3 GeV. A partial-wave analysis within the Bonn-Gatchina framework found dominant contributions from the $3/2^+$ partial wave near threshold, which is identified with the sub-threshold $N(1720)\,3/2^+$ nucleon resonance. To describe the entire data set, which consisted of $\omega$ differential cross sections and a large variety of polarization observables, further contributions from other nucleon resonances were found to be necessary. With respect to non-resonant mechanisms, $\pi$ exchange in the $t$-channel was found to remain small across the analyzed energy range, while pomeron $t$-channel exchange gradually grew from the reaction threshold to dominate all other contributions above $W \approx 2$ GeV., Comment: 12 pages, 8 figures

Published
2017

21. Measurement of the differential and total cross sections of the ${\gamma}d{\rightarrow}{K}^{0}\mathrm{{\Lambda}}(p)$ reaction within the resonance region

Author

Compton, N., Taylor, C.E., Hicks, K., Zachariou, N., Ilieva, Y., Klempt, E., Nikonov, V.A., Sarantsev, A.V., Adhikari, K.P., Adhikari, S., Akbar, Z., Anefalos Pereira, S., Avakian, H., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Camp, M., Cao, Frank Thanh, Cao, T., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Filippi, A., Fleming, J.A., Fradi, A., Gavalian, G., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gleason, C., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Holtrop, M., Hughes, S.M., Hyde, C.E., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jo, H.S., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuleshov, S.V., Lanza, L., Lenisa, P., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Markov, N., Mckinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R.A., Movsisyan, A., Munevar, E., Munoz Camacho, C., Murdoch, G., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Torayev, B., Trivedi, A., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zhang, J., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), and Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay

Subjects
deuteron, p: spectator, Regge, K+: production, nucleon resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], bremsstrahlung, tagged beam, Lambda: production, CLAS, deuterium: target, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], momentum: correction, Nuclear Experiment, numerical calculations, Monte Carlo, photon: beam, total cross section, partial wave analysis, gamma ray, differential cross section, High Energy Physics::Experiment, pi+ pi, particle identification, missing-mass, 0.8-3.6 GeV0.5-2.6 GeV, experimental results, Jefferson Lab, photoproduction
Abstract

International audience; We report the first measurement of differential and total cross sections for the γd→K0Λ(p) reaction, using data from the CLAS detector at the Thomas Jefferson National Accelerator Facility. Data collected during two separate experimental runs were studied with photon-energy coverage 0.8–3.6 GeV and 0.5– 2.6 GeV, respectively. The two measurements are consistent giving confidence in the method and determination of systematic uncertainties. The cross sections are compared with predictions from the KAON-MAID theoretical model (without kaon exchange), which deviate from the data at higher W and at forward kaon angles. These data, along with previously published cross sections for K+Λ photoproduction, provide essential constraints on the nucleon resonance spectrum. A first partial wave analysis was performed that describes the data without the introduction of new resonances.

Published
2017

22. Beam-Target Helicity Asymmetry for $\vec{\gamma} \vec{n} \rightarrow \pi^- p$ in the $N^*$ Resonance Region

Author

Ho , D., Peng , P., Bass , C., Collins , P., D'Angelo , A., Deur , A., Fleming , J., Hanretty , C., Kageya , T., Khandaker , M., Klein , F.J., Klempt , E., Laine , V., Lowry , M.M., Lu , H., Nepali , C., Nikonov , V.A., O'Connell , T., Sandorfi , A.M., Sarantsev , A.V., Schumacher , R.A., Strakovsky , I.I., $v{S}varc , A., Walford , N.K., Wei , X., Whisnant , C.S., Workman , R.L., Zonta , I., Adhikari , K.P., Adikaram , D., Akbar , Z., Amaryan , M.J., Anefalos Pereira , S., Avakian , H., Ball , J., Bashkanov , M., Battaglieri , M., Batourine , V., Bedlinskiy , I., Biselli , A., Briscoe , W.J., Burkert , V.D., Carman , D.S., Celentano , A., Charles , G., Chetry , T., Ciullo , G., Clark , L., Colaneri , L., Cole , P.L., Contalbrigo , M., Crede , V., Dashyan , N., De Sanctis , E., De Vita , R., Djalali , C., Dupre , R., El Alaoui , A., El Fassi , L., Elouadrhiri , L., Eugenio , P., Fedotov , G., Fegan , S., Fersch , R., Filippi , A., Fradi , A., Ghandilyan , Y., Gilfoyle , G.P., Girod , F.X., Glazier , D.I., Gleason , C., Gohn , W., Golovatch , E., Gothe , R.W., Griffioen , K.A., Guidal , M., Guo , L., Hakobyan , H., Harrison , N., Hattawy , M., Hicks , K., Holtrop , M., Hughes , S.M., Ilieva , Y., Ireland , D.G., Ishkhanov , B.S., Isupov , E.L., Jenkins , D., Jiang , H., Jo , H.S., Joo , K., Joosten , S., Keller , D., Khachatryan , G., Kim , A., Kim , W., Klein , A., Kubarovsky , V., Kuleshov , S.V., Lanza , L., Lenisa , P., Livingston , K., MacGregor , I, Markov , N., Mckinnon , B., Mineeva , T., Mokeev , V., Montgomery , R.A., Movsisyan , A, Munoz Camacho , C., Murdoch , G., Niccolai , S., Niculescu , G., Osipenko , M., Paolone , M., Paremuzyan , R., Park , K., Pasyuk , E., Phelps , W., Pogorelko , O., Price , J.W., Procureur , S., Protopopescu , D., Ripani , M., Riser , D., Ritchie , B.G., Rizzo , A., Rosner , G., Sabati$^'e , F., Salgado , C., Sharabian , Y.G., Skorodumina , Iu., Smith , G.D., Sober , D.I., Sokhan , D., Sparveris , N., Strauch , S., Tian , Ye, Torayev , B., Ungaro , M., Voskanyan , H., Voutier , E., Watts , D.P., Wood , M.H., Zachariou , N., Zhang , J., Zhao , Z.W., Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont ( LPC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
25.20.Lj, deuteron, partial wave, nucleon resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], isospin, 13.88.+e, CLAS, 14.20.Gk, quantum chromodynamics, n: target, vertex, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, numerical calculations, Monte Carlo, polarization, photon, helicity: asymmetry, final-state interaction, resonance, kinematics, W: mass, +pi-+p%22">photon n --> pi- p, 13.60.Le, Jefferson Lab
Abstract

We report the first beam-target double-polarization asymmetries in the $\gamma + n(p) \rightarrow \pi^- + p(p)$ reaction spanning the nucleon resonance region from invariant mass $W$= $1500$ to $2300$ MeV. Circularly polarized photons and longitudinally polarized deuterons in $H\!D$ have been used with the CLAS detector at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the {\it{E}} polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses, and have led to significant revisions for several $\gamma nN^*$ resonance photo-couplings., Comment: 6 pages, 5 figures; Physical Review Letters - in press

Published
2017

23. Measurement of polarisation observables in Ks0Σ+ photoproduction off the proton

Author

Ewald, R., Anisovich, A.V., Bantes, B., Bartholomy, O., Bayadilov, D., Beck, R., Beloglazov, Y.A., Brinkmann, K.-T., Crede, V., Dutz, H., Elsner, D., Fornet-Ponse, K., Frommberger, F., Funke, Ch., Gridnev, A.B., Gutz, E., Hannappel, J., Hillert, W., Hoffmeister, P., Jaegle, I., Jahn, O., Jude, T.C., Junkersfeld, J., Kalinowsky, H., Kammer, S., Kleber, V., Klein, Frank, Klein, Friedrich, Klempt, E., Krusche, B., Lang, M., Löhner, H., Lopatin, I.V., Menze, D., Mertens, T., Messchendorp, J.G., Metag, V., Nanova, M., Nikonov, V.A., Novinski, D., Novotny, R., Ostrick, M., Pant, L., van Pee, H., Roy, A., Sarantsev, A.V., Schadmand, S., Schmidt, C., Schmieden, H., Schoch, B., Shende, S., Sokhoyan, V., Süle, A., Sumachev, V.V., Szczepanek, T., Thoma, U., Trnka, D., Varma, R., Walther, D., and Wendel, Ch.

Subjects
Polarisation in interactions and scattering, Nuclear Theory, Meson production, High Energy Physics::Experiment, Decays of baryons, Other strange mesons, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999, Baryon resonances (SCB0)
Abstract

The reaction γp→KS0Σ+ is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first measurement of photon beam asymmetries in this reaction up to Eγ=1650MeV. In addition, the recoil hyperon polarisation was determined through the asymmetry in the weak decay Σ+→pπ0 up to Eγ=2250MeV. The data are compared to partial wave analyses, and the possible impact on the interpretation of a recently observed prominent structure in the cross section near the K⁎ thresholds is discussed. Keywords: Meson production, Other strange mesons, Baryon resonances (SCB0), Decays of baryons, Polarisation in interactions and scattering

Published
2014

24. K+Λ and K+Σ0 photoproduction with fine center-of-mass energy resolution

Author

Jude, T.C., Glazier, D.I., Watts, D.P., Aguar-Bartolomé, P., Akasoy, L.K., Annand, J.R.M., Arends, H.J., Bantawa, K., Beck, R., Bekrenev, V.S., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Demissie, B.T., Dieterle, M., Downie, E.J., Fil'kov, L.V., Gregor, R., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Kashevarov, V.L., Keshelashvili, I., Kondratiev, R., Korolija, M., Koulbardis, A.A., Kruglov, S.P., Krusche, B., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Manley, D.M., Marinides, Z., Mart, T., Martinez, M., McGeorge, J.C., McNicoll, E.F., Middleton, D.G., Mushkarenkov, A., Nefkens, B.M.K., Nikolaev, A., Nikonov, V.A., Oberle, M., Ostrick, M., Otte, P.B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Sarantsev, A.V., Schumann, S., Sikora, M.H., Sober, D.I., Starostin, A., Strakovsky, I., Suarez, I.M., Supek, I., Thiel, M., Thomas, A., Unverzagt, M., Werthmüller, D., Witthauer, L., and Zehr, F.

Subjects
Nuclear and High Energy Physics
Published
2014
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27. Three I=0 JPC=2 −+ mesons

Author

Anisovich, A.V., Baker, C.A., Batty, C.J., Bugg, D.V., Cooper, A.R., Hodd, C., Nikonov, V.A., Sarantsev, A.V., Sarantsev, V.V., and Zou, B.S.

Published
2000
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41. First measurement of the polarization observable E in the [formula omitted] reaction up to 2.25 GeV

Author

Strauch, S., Briscoe, W.J., Döring, M., Klempt, E., Nikonov, V.A., Pasyuk, E., Rönchen, D., Sarantsev, A.V., Strakovsky, I., Workman, R., Adhikari, K.P., Adikaram, D., Anderson, M.D., Anefalos Pereira, S., Anisovich, A.V., Badui, R.A., Ball, J., Batourine, V., Battaglieri, M., Bedlinskiy, I., Benmouna, N., Biselli, A.S., Brock, J., Brooks, W.K., Burkert, V.D., Cao, T., Carlin, C., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P.L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Forest, T.A., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S.M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joo, K., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuhn, S.E., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Markov, N., McKinnon, B., Meekins, D.G., Meyer, C.A., Mokeev, V., Montgomery, R.A., Moody, C.I., Moutarde, H., Movsisyan, A., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., O'Rielly, G., Osipenko, M., Ostrovidov, A.I., Park, K., Peng, P., Phelps, W., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Roy, P., Sabatié, F., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seely, M.L., Senderovich, I., Sharabian, Y.G., Simonyan, A., Skorodumina, Iu., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stoler, P., Stepanyan, S., Sytnik, V., Taiuti, M., Tian, Ye, Trivedi, A., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., and Zonta, I.

Published
2015
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42. Photoproduction of ω mesons off the proton

Author

Wilson, A., Crede, V., Anisovich, A.V., Bacelar, J.C.S., Bantes, B., Bartholomy, O., Bayadilov, D., Beck, R., Beloglazov, Y.A., Brinkmann, K.T., Castelijns, R., Dutz, H., Elsner, D., Ewald, R., Frommberger, F., Fuchs, M., Funke, Chr., Gregor, R., Gridnev, A., Gutz, E., Hannappel, J., Hillert, W., Hoffmeister, P., Horn, I., Jaegle, I., Jude, T., Junkersfeld, J., Kalinowsky, H., Kleber, V., Klein, Frank, Klein, Friedrich, Klempt, E., Kotulla, M., Krusche, B., Lang, M., Löhner, H., Lopatin, I.V., Lugert, S., Mertens, T., Messchendorp, J.G., Metag, V., Nanova, M., Nikonov, V.A., Novinski, D., Novotny, R., Ostrick, M., Pant, L.M., van Pee, H., Pfeiffer, M., Roy, A., Sarantsev, A.V., Schmidt, C., Schmieden, H., Shende, S., Sokhoyan, V., Sparks, N., Süle, A., Sumachev, V.V., Szczepanek, T., Thoma, U., Trnka, D., Varma, R., Walther, D., Wendel, Ch., and Wiedner, U.

Published
2015
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43. Photon beam asymmetry Σ in the reaction γ→p→pω for E= 1.152 to 1.876 GeV

Author

Collins, P., primary, Ritchie, B.G., additional, Dugger, M., additional, Klein, F.J., additional, Anisovich, A.V., additional, Klempt, E., additional, Nikonov, V.A., additional, Sarantsev, A., additional, Adhikari, K.P., additional, Adhikari, S., additional, Adikaram, D., additional, Akbar, Z., additional, Anefalos Pereira, S., additional, Avakian, H., additional, Ball, J., additional, Baltzell, N.A., additional, Bashkanov, M., additional, Battaglieri, M., additional, Batourine, V., additional, Bedlinskiy, I., additional, Biselli, A.S., additional, Boiarinov, S., additional, Briscoe, W.J., additional, Brooks, W.K., additional, Burkert, V.D., additional, Cao, Frank Thanh, additional, Cao, T., additional, Carman, D.S., additional, Celentano, A., additional, Charles, G., additional, Chetry, T., additional, Ciullo, G., additional, Clark, L., additional, Cole, P.L., additional, Contalbrigo, M., additional, Cortes, O., additional, Crede, V., additional, Dashyan, N., additional, De Vita, R., additional, De Sanctis, E., additional, Defurne, M., additional, Deur, A., additional, Djalali, C., additional, Dupre, R., additional, Egiyan, H., additional, El Alaoui, A., additional, El Fassi, L., additional, Eugenio, P., additional, Fedotov, G., additional, Filippi, A., additional, Fleming, J.A., additional, Ghandilyan, Y., additional, Gilfoyle, G.P., additional, Giovanetti, K.L., additional, Girod, F.X., additional, Glazier, D.I., additional, Gleason, C., additional, Golovatch, E., additional, Gothe, R.W., additional, Griffioen, K.A., additional, Guidal, M., additional, Hafidi, K., additional, Hakobyan, H., additional, Hanretty, C., additional, Harrison, N., additional, Hattawy, M., additional, Heddle, D., additional, Hicks, K., additional, Hollis, G., additional, Holtrop, M., additional, Hughes, S.M., additional, Ilieva, Y., additional, Ireland, D.G., additional, Ishkhanov, B.S., additional, Isupov, E.L., additional, Jenkins, D., additional, Jiang, H., additional, Jo, H.S., additional, Joosten, S., additional, Keller, D., additional, Khachatryan, G., additional, Khachatryan, M., additional, Khandaker, M., additional, Kim, A., additional, Kim, W., additional, Klein, A., additional, Kubarovsky, V., additional, Kuleshov, S.V., additional, Lanza, L., additional, Lenisa, P., additional, Livingston, K., additional, MacGregor, I.J.D., additional, Markov, N., additional, McKinnon, B., additional, Meyer, C.A., additional, Meziani, Z.E., additional, Mineeva, T., additional, Mokeev, V., additional, Montgomery, R.A., additional, Movsisyan, A., additional, Munevar, E., additional, Munoz Camacho, C., additional, Nadel-Turonski, P., additional, Net, L.A., additional, Niccolai, S., additional, Niculescu, G., additional, Niculescu, I., additional, Osipenko, M., additional, Ostrovidov, A.I., additional, Paolone, M., additional, Paremuzyan, R., additional, Park, K., additional, Pasyuk, E., additional, Phelps, W., additional, Pisano, S., additional, Pogorelko, O., additional, Price, J.W., additional, Procureur, S., additional, Prok, Y., additional, Protopopescu, D., additional, Raue, B.A., additional, Ripani, M., additional, Rizzo, A., additional, Rosner, G., additional, Sabatié, F., additional, Salgado, C., additional, Schumacher, R.A., additional, Sharabian, Y.G., additional, Simonyan, A., additional, Skorodumina, Iu., additional, Smith, G.D., additional, Sober, D.I., additional, Sokhan, D., additional, Sparveris, N., additional, Stankovic, I., additional, Stepanyan, S., additional, Strakovsky, I.I., additional, Strauch, S., additional, Taiuti, M., additional, Ungaro, M., additional, Voskanyan, H., additional, Voutier, E., additional, Walford, N.K., additional, Watts, D.P., additional, Wei, X., additional, Wood, M.H., additional, Zachariou, N., additional, Zhang, J., additional, and Zhao, Z.W., additional

Published
2017
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45. First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV

Author

Strauch, S., Briscoe, W.J., Doring, M., Klempt, E., Nikonov, V.A., Pasyuk, E., Ronchen, D., Sarantsev, A.V., Strakovsky, I., Workman, R., Adhikari, K.P., Adikaram, D., Anderson, M.D., Anefalos Periera, S., Anisovich, A.V., Badui, R.A., Ball, J., Batourine, V., Battaglieri, M., Bedlinskiy, I., Benmouna, N., Biselli, A.S., Brock, J., Brooks, W.K., Burkert, V.D., Cao, T., Carlin, C., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colerani, L., Cole, P.L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., Dasjyan, N., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J.A., Forest, T.A., Fradi, A., Gevorgyna, N., Ghandilyan, Y., Giovanetti, K.L., Girod, F.X., Glazier, D.I., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S.M., Ilyeva, Y., Ireland, D.G., Ishkanov, B.S., Isupov, E.L., Jenkins, D., Jiang, H., Jo, H.S., Joo, K., Joosten, S., Keith, C.D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuhn, S.E., Lenisa, P., Livingston, K., Lu, H.Y., MacGregor, I.J.D., Markov, N., McKinnon, B., Meekins, D.G., Meyer, C.A., Mokeev, V., Montgomery, R.A., Moody, C.I., Moutarde, H., Movsisyan, A., Munevar, E., Munoz Camacho, C., Badel-Turonski, P., Net, L.A., Niccolai, S., Niculescu, G., Niculescu, I., O'Reilley, G., Osipenko, M., Ostrovidov, A.I., Park, K., Peng, P., Phelps, W., Phillips, J.J, Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Roy, P., Sabatie, F., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seely, M.L., Senderovich, I., Sharabian, Y.G., Simonyan, A., Skorodumina, I., Smith, G.D., Sober, D.I., Sokhan, D., Sparveris, N., Stoler, P., Stepanyan, S., Sytnik, V., Taiuti, M., Tian, Y., Trivedi, A., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., and Zonta, I.

Subjects
Polarization observables, Nuclear and High Energy Physics, Baryon spectroscopy, FROST experiment, Pion photoproduction, Socio-culturale, lcsh:QC1-999, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear Experiment, QC, lcsh:Physics
Abstract

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E , for the reaction View the MathML source, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn–Gatchina, Jülich–Bonn, and SAID groups.

Published
2015

46. Measurement of polarisation observables in [formula omitted] photoproduction off the proton

Author

Ewald, R., Anisovich, A.V., Bantes, B., Bartholomy, O., Bayadilov, D., Beck, R., Beloglazov, Y.A., Brinkmann, K.-T., Crede, V., Dutz, H., Elsner, D., Fornet-Ponse, K., Frommberger, F., Funke, Ch., Gridnev, A.B., Gutz, E., Hannappel, J., Hillert, W., Hoffmeister, P., Jaegle, I., Jahn, O., Jude, T.C., Junkersfeld, J., Kalinowsky, H., Kammer, S., Kleber, V., Klein, Frank, Klein, Friedrich, Klempt, E., Krusche, B., Lang, M., Löhner, H., Lopatin, I.V., Menze, D., Mertens, T., Messchendorp, J.G., Metag, V., Nanova, M., Nikonov, V.A., Novinski, D., Novotny, R., Ostrick, M., Pant, L., van Pee, H., Roy, A., Sarantsev, A.V., Schadmand, S., Schmidt, C., Schmieden, H., Schoch, B., Shende, S., Sokhoyan, V., Süle, A., Sumachev, V.V., Szczepanek, T., Thoma, U., Trnka, D., Varma, R., Walther, D., and Wendel, Ch.

Published
2014
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47. [formula omitted] and [formula omitted] photoproduction with fine center-of-mass energy resolution

Author

Jude, T.C., Glazier, D.I., Watts, D.P., Aguar-Bartolomé, P., Akasoy, L.K., Annand, J.R.M., Arends, H.J., Bantawa, K., Beck, R., Bekrenev, V.S., Berghäuser, H., Braghieri, A., Branford, D., Briscoe, W.J., Brudvik, J., Cherepnya, S., Demissie, B.T., Dieterle, M., Downie, E.J., Fil'kov, L.V., Gregor, R., Heid, E., Hornidge, D., Jaegle, I., Jahn, O., Kashevarov, V.L., Keshelashvili, I., Kondratiev, R., Korolija, M., Koulbardis, A.A., Kruglov, S.P., Krusche, B., Lisin, V., Livingston, K., MacGregor, I.J.D., Maghrbi, Y., Manley, D.M., Marinides, Z., Mart, T., Martinez, M., McGeorge, J.C., McNicoll, E.F., Middleton, D.G., Mushkarenkov, A., Nefkens, B.M.K., Nikolaev, A., Nikonov, V.A., Oberle, M., Ostrick, M., Otte, P.B., Oussena, B., Pedroni, P., Pheron, F., Polonski, A., Prakhov, S., Robinson, J., Rosner, G., Rostomyan, T., Sarantsev, A.V., Schumann, S., Sikora, M.H., Sober, D.I., Starostin, A., Strakovsky, I., Suarez, I.M., Supek, I., Thiel, M., Thomas, A., Unverzagt, M., Werthmüller, D., Witthauer, L., and Zehr, F.

Published
2014
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48. <math altimg='si1.gif' xmlns='http://www.w3.org/1998/Math/MathML'><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><mi>Λ</mi></math> and <math altimg='si2.gif' xmlns='http://www.w3.org/1998/Math/MathML'><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>Σ</mi></mrow><mrow><mn>0</mn></mrow></msup></math> photoproduction with fine center-of-mass energy resolution

Author

Jude, T.C.(School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, UK), Glazier, D.I.(School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, UK), Watts, D.P.(School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, UK), Aguar-Bartolomé, P.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Akasoy, L.K.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Annand, J.R.M.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), Arends, H.J.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Bantawa, K.(Kent State University, Kent, OH, 44242, USA), Beck, R.(Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, D-53115, Germany), Bekrenev, V.S.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia), Berghäuser, H.(Physikalisches Institut, University of Giessen, Giessen, D-35392, Germany), Braghieri, A.(INFN Sezione di Pavia, Pavia, I-27100, Italy), Branford, D.(School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, UK), Briscoe, W.J.(The George Washington University, Washington, DC, 20052, USA), Brudvik, J.(The George Washington University, Washington, DC, 20052, USA), Cherepnya, S.(Lebedev Physical Institute, Moscow, 119991, Russia), Demissie, B.T.(The George Washington University, Washington, DC, 20052, USA), Dieterle, M.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Downie, E.J.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Fil'kov, L.V.(Lebedev Physical Institute, Moscow, 119991, Russia), Gregor, R.(Physikalisches Institut, University of Giessen, Giessen, D-35392, Germany), Heid, E.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Hornidge, D.(Mount Allison University, Sackville, New Brunswick, E4L3B5, Canada), Jaegle, I.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Jahn, O.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Kashevarov, V.L.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Keshelashvili, I.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Kondratiev, R.(Institute for Nuclear Research, Moscow, 125047, Russia), Korolija, M.(Rudjer Boskovic Institute, Zagreb, HR-10000, Croatia), Koulbardis, A.A.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia), Kruglov, S.P.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia), Krusche, B.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Lisin, V.(Institute for Nuclear Research, Moscow, 125047, Russia), Livingston, K.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), MacGregor, I.J.D.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), Maghrbi, Y.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Manley, D.M.(Kent State University, Kent, OH, 44242, USA), Marinides, Z.(The George Washington University, Washington, DC, 20052, USA), Mart, T.(Departemen Fisika, FMIPA, Universitas Indonesia, Depok, 16424, Indonesia), Martinez, M.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), McGeorge, J.C.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), McNicoll, E.F.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), Middleton, D.G.(Mount Allison University, Sackville, New Brunswick, E4L3B5, Canada), Mushkarenkov, A.(INFN Sezione di Pavia, Pavia, I-27100, Italy), Nefkens, B.M.K.(The George Washington University, Washington, DC, 20052, USA), Nikolaev, A.(Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, D-53115, Germany), Nikonov, V.A.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia), Oberle, M.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Ostrick, M.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Otte, P.B.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Oussena, B.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Pedroni, P.(INFN Sezione di Pavia, Pavia, I-27100, Italy), Pheron, F.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Polonski, A.(Institute for Nuclear Research, Moscow, 125047, Russia), Prakhov, S.(The George Washington University, Washington, DC, 20052, USA), Robinson, J.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), Rosner, G.(Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK), Rostomyan, T.(INFN Sezione di Pavia, Pavia, I-27100, Italy), Sarantsev, A.V.(Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, D-53115, Germany), Schumann, S.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Sikora, M.H.(School of Physics, University of Edinburgh, Edinburgh, EH9 3JZ, UK), Sober, D.I.(The Catholic University of America, Washington, DC, 20064, USA), Starostin, A.(The George Washington University, Washington, DC, 20052, USA), Strakovsky, I.(The George Washington University, Washington, DC, 20052, USA), Suarez, I.M.(The George Washington University, Washington, DC, 20052, USA), Supek, I.(Rudjer Boskovic Institute, Zagreb, HR-10000, Croatia), Thiel, M.(Physikalisches Institut, University of Giessen, Giessen, D-35392, Germany), Thomas, A.(Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Bonn, D-53115, Germany), Unverzagt, M.(Institut für Kernphysik, University of Mainz, Mainz, D-55099, Germany), Werthmüller, D.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), Witthauer, L.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland), and Zehr, F.(Institut für Physik, University of Basel, Basel, CH-4056, Switzerland)

Abstract

Measurements of γp→K+Λ and γp→K+Σ0 cross-sections have been obtained with the photon tagging facility and the Crystal Ball calorimeter at MAMI-C. The measurement uses a novel K+ meson identification technique in which the weak decay products are characterized using the energy and timing characteristics of the energy deposit in the calorimeter, a method that has the potential to be applied at many other facilities. The fine center-of-mass energy ( W ) resolution and statistical accuracy of the new data results in a significant impact on partial wave analyses aiming to better establish the excitation spectrum of the nucleon. The new analyses disfavor a strong role for quark–diquark dynamics in the nucleon.

Published
2014

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