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1. Theep→e′pηReaction at and above theS11(1535)Baryon Resonance

Author: M. J. Amaryan, M. Taiuti, S. K. Matthews, J. Ficenec, Gyurjyan, W. Kim, A. Longhi, R. A. Schumacher, B. E. Bonner, L. Elouadrhiri, A. P. Freyberger, R. Magahiz, Robert E. Welsh, S. Dytman, S. Whisnant, B. M. Preedom, Federico Ronchetti, R. J. Feuerbach, K. L. Giovanetti, B. Asavapibhop, Michael Dugger, Shalev Gilad, De Sanctis E, A. V. Vlassov, G. Ricco, J. R. Kane, H. Avakian, Philip L. Cole, J. P. Cummings, G. S. Adams, Larry Weinstein, R. A. Miskimen, K. Joo, J. Shaw, R. W. Major, Moshe Gai, M. Kossov, W. J. Briscoe, D. Rowntree, D. Doughty, K. Beard, W. K. Brooks, Friedrich Klein, R. S. Hicks, Brian Raue, Kevin Fissum, Kalvir S. Dhuga, Barry Ritchie, A. Coleman, K. A. Griffioen, M. M. Ito, G. Riccardi, L. M. Qin, J. J. Manak, M. Mirazita, J. M. Laget, C. E. Hyde-Wright, J. W C McNabb, M. S. Ohandjanyan, D. Heddle, C. Salgado, H. R. Weller, Roy Thompson, Curtis Smith, D. P. Weygand, Herbert O. Funsten, S. A. Philips, Patrick Girard, Y. Kuang, H. Egiyan, M. Witkowski, Bernhard Mecking, Mestayer, A. J. Sarty, Jing Zhao, S. Stepanyan, De Vita R, D. G. Jenkins, C. Djalali, Z. L. Zhou, M. Lucas, Airton Deppman, D. I. Sober, A. Shafi, D. Hancock, Avraham Klein, Leskin Ga, M. Battaglieri, S. McAleer, William Bertozzi, E. Polli, E. Anciant, L. Farhi, G. E. Dodge, Daniel S. Carman, V. B. Gavrilov, O. Pogorelko, A. K. Opper, G. Audit, J. W. Price, M. Khandaker, E. Wolin, P. V. Degtyarenko, Y. Patois, Gerard Gilfoyle, Dinko Pocanic, L.C. Dennis, K. Loukachine, N. Pivnyuk, M. Bektasoglu, S. E. Kuhn, S. M. Shuvalov, D. Lawrence, M. Eckhause, J. Napolitano, M. Ripani, M. Guillo, Jochen Heisenberg, Y. V. Efremenko, Volker D. Burkert, M. Sanzone, J. Connelly, Donal Day, M. Sargsyan, G. A. Peterson, M. Guidal, A. V. Skabelin, J. Yun, D. Cords, A. Yegneswaran, A. S. Biselli, Elton Smith, S. Barrow, M. Holtrop, Thomas E. Smith, G. S. Mutchler, M. Anghinolfi, Hall Crannell, D. G. Crabb, James Mueller, S. Taylor, P. D. Rubin, G. Capitani, F. Roudot, D. J. Tedeschi, Y. G. Sharabian, M. Spraker, Sapunenko, R. C. Minehart, M. Klusman, Nicola Bianchi, S. Boiarinov, C. A. Meyer, J. S. McCarthy, B. Carnahan, Thierry Auger, A. R. Reolon, Michael Vineyard, C. Marchand, P. Rossi, P. Dragovitsch, F. W. Hersman, R. A. Demirchyan, T. Y. Tung, J. Hardie, K. Y. Kim, Muccifora, R. A. Niyazov, John T. O'Brien, P. Corvisiero, K. S. Egiyan, Calarco, P. Stoler, and K. Hicks
Subjects: Baryon, Physics, Nuclear physics, Particle physics, Photon, Amplitude, Angular distribution, Meson, Momentum transfer, General Physics and Astronomy, Resonance, Invariant (physics), Nuclear Experiment
Abstract: New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
Published: 2001

2. Precise Measurement of the Neutron Magnetic Form FactorGMnin the Few-GeV2Region

Author: R. J. Feuerbach, J. P. Cummings, L. C. Smith, E. Munevar, R. De Masi, D. Keller, M. Kossov, B. S. Ishkhanov, I. Popa, K. S. Egiyan, G. Ricco, K. Mikhailov, L. Cheng, M. Khandaker, M. Garçon, J. Shaw, Michael Wood, P. Nadel-Turonski, Nikolay Shvedunov, M. R. Niroula, K. Hafidi, R. Nasseripour, S. McAleer, Friedrich Klein, B. P. Quinn, Brian Raue, V. S. Serov, L. Casey, F. X. Girod, Susan Taylor, Marco A. Huertas, M. Lowry, V. Sapunenko, D. P. Watts, L. C. Dennis, B. E. Bonner, Hartmuth Arenhövel, Dinko Pocanic, H. Egiyan, R. G. Fersch, H. Avakian, D. Doughty, B. B. Niczyporuk, G. S. Adams, S. Park, D. Sharov, N. Kalantarians, P. L. Cole, Sylvain Bouchigny, Sabine Jeschonnek, R. C. Minehart, Kei Moriya, D. Heddle, P. Rossi, J. Lachniet, H. G. Juengst, C. A. Meyer, N. Pivnyuk, K. Joo, W. J. Briscoe, B. L. Berman, A. Tkabladze, G. V. Fedotov, E. Pasyuk, D. Rowntree, A. Coleman, L. M. Qin, M. Y. Gabrielyan, S. E. Kuhn, S. A. Dytman, V. Crede, Y. Ilieva, J. R. Calarco, T. Mineeva, J. W. Price, M. J. Amaryan, C. Paterson, S. Strauch, M. MacCormick, A.V. Stavinsky, M. Klusman, I. Hleiqawi, V. P. Kubarovsky, K. P. Adhikari, S. L. Careccia, A. Empl, L. El Fassi, O. Pogorelko, B. Moreno, D. P. Weygand, J. Salamanca, R. Suleiman, M. E. McCracken, Elton Smith, K. L. Giovanetti, B. Asavapibhop, G. V. O'Rielly, Tsutomu Mibe, Larry Weinstein, Z. W. Zhao, J. W C McNabb, D. J. Tedeschi, D. Protopopescu, D. G. Jenkins, Barry Ritchie, M. Anghinolfi, James Mueller, S. Malace, S. A. Morrow, P. Rubin, I. Bedlinskiy, G. S. Mutchler, Konstantin Stopani, S. Pozdniakov, V. Gyurjyan, M. M. Ito, C. Djalali, Y. G. Sharabian, G. Rosner, T. Kageya, K. Livingston, D. S. Dale, X. Wei, R. Dickson, V. Kuznetsov, C. E. Hyde-Wright, H. Denizli, N. Guler, N. A. Baltzell, P. Mattione, K. A. Griffioen, M. S. Saini, A. V. Skabelin, P. Dragovitsch, J. Zhang, S. Barrow, E. De Sanctis, S. Niccolai, J. T. Goetz, E. Polli, H. Bagdasaryan, R. A. Miskimen, J. D. Kellie, B. McKinnon, Sergey Kuleshov, M. Bektasoglu, J. Hardie, M. Nozar, W. Kim, Laird Kramer, G. Niculescu, D. I. Sober, D. Branford, M. Guidal, R. A. Schumacher, H. Hakobyan, M. Mirazita, P. Khetarpal, C. Hanretty, J. M. Laget, M. Holtrop, Victor Mokeev, L. Graham, J. R. Johnstone, N. Gevorgyan, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, A. Daniel, K. Beard, Kalvir S. Dhuga, S. Bültmann, A. I. Ostrovidov, J. Yun, D. Cords, V. Batourine, T. A. Forest, A. Yegneswaran, A. C S Lima, A. Sandorfi, K. Park, R. Fatemi, S. Stepanyan, A. V. Vlassov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, J. Pierce, Avraham Klein, B. Zhao, J. Langheinrich, R. De Vita, A. Fradi, S. S. Stepanyan, S. A. Philips, William Brooks, N. Markov, P. Konczykowski, B. E. Stokes, J. J. Manak, S. Anefalos Pereira, G. E. Dodge, H. Y. Lu, N. Dashyan, Maryam Moteabbed, P. V. Degtyarenko, K. V. Dharmawardane, I. Niculescu, D. Lawrence, D. Schott, F. W. Hersman, M. Battaglieri, N. Baillie, P. Stoler, K. Hicks, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, R. Bradford, B. A. Mecking, K. Lukashin, E. Wolin, Gerard Gilfoyle, M. Guillo, D. Sokhan, W. Gohn, N. Hassall, M. Bellis, E. Golovatch, J. P. Ball, J. Hu, Y. Prok, D. S. Carman, S. Dhamija, M. D. Mestayer, L. Elouadrhiri, I. I. Strakovsky, E. L. Isupov, R. W. Gothe, G. Gavalian, S. Tkachenko, A. Deur, Michael L. Williams, J. Kuhn, N. Benmouna, J. P. Santoro, Andrei Afanasev, M. Ripani, D. G. Crabb, K. Y. Kim, Roy Thompson, Cynthia Marie Hadjidakis, S. Boiarinov, Michael Dugger, B. M. Preedom, Douglas Higinbotham, M. Yurov, Lorenzo Zana, H. S. Jo, C. Bookwalter, C. Salgado, Kwangsoo Kim, G. Riccardi, P. Eugenio, A. Starostin, M. Taiuti, Michael Vineyard, and P. Collins
Subjects: Physics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, Scintillator, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, Deuterium, 0103 physical sciences, Magnetic form factor, Neutron detection, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering
Abstract: The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
Published: 2009

3. Search for the Photoexcitation of Exotic Mesons in theπ+π+π−System

Author: M. Nozar, C. Salgado, D. P. Weygand, L. Guo, G. Adams, Ji Li, P. Eugenio, M. J. Amaryan, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, R. Fatemi, G. Fedotov, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, J. Salamanca, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao, and Z. W. Zhao
Subjects: Quantum chromodynamics, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Bremsstrahlung, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Isobar, Production (computer science), 010306 general physics, Spin-½
Abstract: A search for exotic mesons in the $$\pi^{+}\pi^{+}\pi^{-}$$ system photoproduced by the charge exchange reaction $$\gamma p\to \pi^{+}\pi^{+}\pi^{-}(n)$$ was carried out by the CLAS collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on a sample of 83,000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic $$J^{PC} = 1^{-+}$$ resonant state in the 1 to 2 GeV mass range. Our PWA analysis, based on the isobar model, shows production of the $$a_{2}(1320)$$ and the $$\pi_{2}(1670)$$ mesons, but no evidence for the $$a_{1}(1260)$$, nor the $$\pi_{1}(1600)$$ exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic $$\pi_1(1600)$$ cross section, less than 2% of the $a_2(1320)
Published: 2009

4. Measurement of Directf0(980)Photoproduction on the Proton

Author: S. Park, Sylvain Bouchigny, V. Crede, J. R. Calarco, E. Wolin, C. E. Hyde, R. A. Schumacher, V. Sapunenko, Dinko Pocanic, P. Nadel-Turonski, L. Casey, V. Mokeev, D. Lawrence, J. P. Cummings, H. G. Juengst, B. E. Stokes, Cynthia Marie Hadjidakis, J. P. Ball, D. S. Carman, A. Fradi, A. V. Vlassov, P. Konczykowski, M. J. Amaryan, S. Dhamija, Michael Dugger, K. Livingston, D. S. Dale, T. Lee, Maryam Moteabbed, M. Kossov, S. E. Kuhn, L. Graham, Ashot Gasparian, B. B. Niczyporuk, C. I O Gordon, M. MacCormick, R. W. Gothe, Z. W. Zhao, R. Dickson, N. Gevorgyan, T. Kageya, H. Avakian, I. Hleiqawi, K. V. Dharmawardane, A.V. Stavinsky, J. Donnelly, G. Asryan, N. Pivnyuk, D. G. Crabb, J. Kuhn, M. E. McCracken, R. De Vita, S. Strauch, E. Clinton, S. Bültmann, S. L. Careccia, D. G. Jenkins, O. P. Dzyubak, D. P. Watts, H. Egiyan, Gerard Gilfoyle, G. Ricco, Lorenzo Zana, J. P. Santoro, C. Tur, L. Gan, Tsutomu Mibe, W. Gohn, T. A. Forest, D. J. Tedeschi, N. Markov, D. Sokhan, D. Sharov, W. Kim, S. Anefalos Pereira, S. Stepanyan, G. Niculescu, M. Yurov, J. Goett, R. A. Miskimen, I. Bedlinskiy, B. McKinnon, M. Y. Gabrielyan, J. Pierce, K. L. Giovanetti, F. X. Girod, Sergey Kuleshov, Avraham Klein, Shifeng Chen, N. Guler, E. Golovatch, Friedrich Klein, Larry Weinstein, N. A. Baltzell, G. E. Dodge, P. Khetarpal, K. A. Stopani, Brian Raue, D. Keller, H. Y. Lu, M. Nozar, D. Branford, J. Salamanca, H. S. Jo, C. Bookwalter, E. De Sanctis, L. Lesniak, G. Riccardi, J. M. Laget, V. V. Mochalov, P. Mattione, K. A. Griffioen, M. Aghasyan, X. Wei, V. Kuznetsov, M. S. Saini, P. V. Degtyarenko, A. I. Ostrovidov, D. I. Sober, A. Sandorfi, K. Park, P. Eugenio, Adam P. Szczepaniak, V. Batourine, C. Hanretty, A. Starostin, M. Guidal, N. Dashyan, M. Taiuti, W. J. Briscoe, E. Pasyuk, H. Hakobyan, S. A. Morrow, G. Rosner, J. T. Goetz, M. Mirazita, C. Djalali, Paolo Rossi, M. Khandaker, L. Bibrzycki, I. Niculescu, J. Lachniet, A. Tkabladze, Y. Ilieva, J. W. Price, M. Holtrop, R. A. Niyazov, Elton Smith, D. G. Ireland, A. Daniel, A. Teymurazyan, I. I. Strakovsky, G. Gavalian, N. Hassall, M. Bellis, P. Ambrozewicz, P. Collins, B. Zhao, R. De Masi, S. Tkachenko, D. Schott, M. Ripani, D. Doughty, P. Stoler, J. J. Melone, S. Niccolai, Z. Krahn, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, C. Salgado, N. Benmouna, J. Langheinrich, S. S. Stepanyan, D. Heddle, J. D. Kellie, A. Deur, N. Baillie, T. Mineeva, S. Malace, Mark W. Paris, J. R. Johnstone, Hall Crannell, M. Osipenko, V. P. Kubarovsky, Y. G. Sharabian, Laird Kramer, L. Cheng, W. K. Brooks, J. Hardie, F. W. Hersman, R. S. Hakobyan, L. Guo, M. Ungaro, B. Moreno, O. Pogorelko, G. S. Mutchler, K. Hicks, Nikolay Shvedunov, D. Protopopescu, B. L. Berman, K. S. Egiyan, L. El Fassi, S. Pozdniakov, M. Garçon, Michael Wood, K. Mikhailov, K. Hafidi, V. S. Serov, M. Battaglieri, N. Kalantarians, R. Bradford, B. A. Mecking, R. Nasseripour, K. Joo, A. Yegneswaran, Michael Vineyard, V. Gyurjyan, J. Zhang, H. Bagdasaryan, L. Todor, R. G. Fersch, C. Paterson, Ji Li, P. L. Cole, M. D. Mestayer, E. L. Isupov, Michael L. Williams, M. M. Ito, S. Boiarinov, F. Sabatié, L. C. Smith, E. Munevar, B. S. Ishkhanov, M. R. Niroula, M. Lowry, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, K. P. Adhikari, D. P. Weygand, O. Glamazdin, Alexei V. Klimenko, Y. Prok, Barry Ritchie, and I. Nakagawa
Subjects: Physics, Particle physics, Proton, Meson, 010308 nuclear & particles physics, Partial wave analysis, Hadron, General Physics and Astronomy, Resonance, 01 natural sciences, 7. Clean energy, Nuclear physics, Particle decay, Pion, 0103 physical sciences, 010306 general physics, Nucleon
Abstract: We report on the results of the first measurement of exclusive f{sub 0}(980) meson photoproduction on protons for E{sub {gamma}}=3.0-3.8 GeV and -t=0.4-1.0 GeV{sup 2}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the {pi}{sup +}{pi}{sup -} channel by performing a partial wave analysis of the reaction {gamma}p{yields}p{pi}{sup +}{pi}{sup -}. Clear evidence of the f{sub 0}(980) meson was found in the interference between P and S waves at M{sub {pi}{sup +}}{sub {pi}{sup -}}{approx}1 GeV. The S-wave differential cross section integrated in the mass range of the f{sub 0}(980) was found to be a factor of about 50 smaller than the cross section for the {rho} meson. This is the first time the f{sub 0}(980) meson has been measured in a photoproduction experiment.
Published: 2009

5. Search for Medium Modifications of theρMeson

Author: S. A. Morrow, C. Djalali, C. Hanretty, A.V. Stavinsky, P. Ambrozewicz, D. J. Tedeschi, Baile Zhang, M. J. Amaryan, H. Juengst, R. A. Miskimen, B. McKinnon, M. MacCormick, Shifeng Chen, I. Bedlinskiy, Carlos A. Salgado, I. Hleiqawi, Andreas Klein, Ji Li, S. L. Careccia, D. Branford, L. Casey, B. B. Niczyporuk, N. Pivnyuk, Nikolay Shvedunov, M. Mirazita, J. M. Laget, K. L. Giovanetti, P. Collins, E. L. Isupov, N. Markov, J. Salamanca, Mark Richard James Williams, J. W C McNabb, Larry Weinstein, J. T. Goetz, S. Boiarinov, K. A. Griffioen, B. M. Preedom, S. McAleer, C. E. Hyde-Wright, J. P. Cummings, S. Niccolai, L. Elouadrhiri, S. Mehrabyan, H. Denizli, F. X. Girod, L. Blaszczyk, R. J. Feuerbach, Lorenzo Zana, J. Hardie, E. De Sanctis, Jens H. Kuhn, I. I. Strakovsky, A. I. Ostrovidov, K. Park, R. A. Schumacher, N. A. Baltzell, M. Khandaker, Dinko Pocanic, D. G. Ireland, V. Crede, Sergey Kuleshov, J. P. Santoro, M. Bektasoglu, H. Hakobyan, Federico Ronchetti, H. S. Jo, G. Riccardi, P. Muehlich, A. Deur, M. Kossov, Gerald Feldman, Volker D. Burkert, A. S. Biselli, S. E. Kuhn, J. R. Calarco, M. Guidal, Z. Krahn, L. C. Smith, E. Munevar, G. Ricco, D. I. Sober, S. Strauch, Rakhsha Nasseripour, K. Moriya, L. Todor, D. Doughty, C. Butuceanu, D. Protopopescu, N. Dashyan, G. Niculescu, M. Holtrop, N. Baillie, Mestayer, M. Battaglieri, B. S. Ishkhanov, S. Pozdniakov, M. Garçon, P. Eugenio, D. P. Watts, H. Egiyan, M. Taiuti, J. D. Kellie, R. C. Minehart, C. A. Meyer, B. Carnahan, S. Tkachenko, C. I O Gordon, F. Sabatié, V. Sapunenko, Laird Kramer, R. Bradford, B. A. Mecking, A. V. Vlassov, J. Langheinrich, G. V. Fedotov, N. Kalantarians, N. Benmouna, M. Ripani, M. Nozar, Yordanka Ilieva, Michael Vineyard, R. De Vita, Gerard Gilfoyle, M. Anghinolfi, Ulrich Mosel, J. J. Melone, Brian Raue, K. Livingston, James Mueller, D. P. Weygand, D. Sokhan, Cynthia Marie Hadjidakis, E. S. Smith, Maryam Moteabbed, M. R. Niroula, Alexei V. Klimenko, S. Anefalos Pereira, D. G. Jenkins, G. S. Mutchler, Michael Dugger, H. O. Funsten, Y. G. Sharabian, K. V. Dharmawardane, E. Wolin, B. L. Berman, S. Stepanyan, L. C. Dennis, R. Dickson, Sylvain Bouchigny, Barry Ritchie, J. P. Ball, Y. Prok, D. S. Carman, P. Rossi, C. Paterson, D. G. Crabb, J. Pierce, H. Avakian, P. Mattione, D. Sharov, N. Guler, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, S. Barrow, I. Niculescu, D. Lawrence, R. De Masi, P. Coltharp, William Brooks, Hall Crannell, M. M. Ito, S. Bültmann, W. J. Briscoe, E. Pasyuk, J. R. Johnstone, L. Guo, M. Ungaro, S. A. Dytman, M. Bellis, K. Joo, S. S. Stepanyan, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, J. W. Price, V. P. Kubarovsky, G. Rosner, O. Pogorelko, Frank Klein, Michael Wood, K. Hafidi, K. S. Egiyan, V. S. Serov, B. E. Stokes, G. S. Adams, K. Mikhailov, Clarisse Tur, P. Nadel-Turonski, Tsutomu Mibe, G. Gavalian, V. Mokeev, P. Stoler, W. Kim, J. Lachniet, K. Hicks, A. Tkabladze, R. S. Hakobyan, L. El Fassi, M. Osipenko, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. L. Cole, Z. W. Zhao, B. Zhao, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Particle physics, Rho meson, Meson, Spectrometer, Nuclear Theory, Spectrum (functional analysis), General Physics and Astronomy, Order (ring theory), Physics and Astronomy(all), Resonance (particle physics), medicine.anatomical_structure, Deuterium, medicine, High Energy Physics::Experiment, Nuclear Experiment, Nucleus
Abstract: The photoproduction of vector mesons on various nuclei has been studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Laboratory. The vector mesons, $$\rho$$, $$\omega$$, and $$\phi$$, are observed via their decay to $e^+e^-$, in order to reduce the effects of final state interactions in the nucleus. Of particular interest are possible in-medium effects on the properties of the $$\rho$$ meson. The $$\rho$$ spectral function is extracted from the data on various nuclei, carbon, iron, and titanium, and compared to the spectrum from liquid deuterium, which is relatively free of nuclear effects. We observe no significant mass shift for the $$\rho$$ meson; however, there is some widening of the resonance in titanium and iron, which is consistent with expected collisional broadening.
Published: 2007

6. Experimental Study of ExclusiveH2(e,e′p)nReaction Mechanisms at HighQ2

Author: Y. Ilieva, V. Gyurjyan, R. Miskimen, N. Dashyan, J. Zhang, M. Guillo, G. Gavalian, H. Bagdasaryan, S. A. Morrow, S. Tkachenko, S. Mehrabyan, M. Guidal, G. Riccardi, N. Benmouna, E. Wolin, V. Sapunenko, Alexei V. Klimenko, J. P. Ball, D. S. Carman, Dinko Pocanic, R. J. Feuerbach, L. Guo, M. Ungaro, M. Holtrop, P. Eugenio, R. G. Fersch, D. G. Crabb, D. Lawrence, C. Marchand, J. P. Cummings, S. E. Kuhn, A. Deur, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, P. L. Cole, Marco Ripani, Y. Prok, Barry Ritchie, M. Kossov, M. Taiuti, V. Mokeev, S. Bouchigny, R. A. Schumacher, Nikolay Shvedunov, C. Tur, W. K. Brooks, E. De Sanctis, M. Khandaker, Elton Smith, G. Audit, C. E. Hyde-Wright, K. Livingston, C. I O Gordon, R. Dickson, S. Bültmann, D. Cords, P. Nadel-Turonski, Tsutomu Mibe, M. Battaglieri, D. I. Sober, Federico Ronchetti, Sergey Kuleshov, C. Djalali, A. Yegneswaran, M. J. Amaryan, M. Anghinolfi, M. Nozar, N. Kalantarians, N. Guler, S. Stepanyan, Ji Li, P. Coltharp, M. M. Ito, James Mueller, P. Collins, Cynthia Marie Hadjidakis, I. Hleiqawi, J. Pierce, Avraham Klein, R. Fatemi, B. L. Berman, J. Langheinrich, S. S. Stepanyan, Michael Dugger, R. Bradford, G. S. Mutchler, J. J. Melone, J. Lachniet, S. L. Careccia, A. Tkabladze, Z. Krahn, S. Barrow, Michael Wood, A. V. Vlassov, Y. G. Sharabian, G. E. Dodge, H. Y. Lu, H. Denizli, L. C. Smith, E. Munevar, G. V. O'Rielly, P. Ambrozewicz, K. Hafidi, M. D. Mestayer, S. Niccolai, M. Osipenko, B. S. Ishkhanov, P. Rossi, N. A. Baltzell, Friedrich Klein, N. Baillie, P. V. Degtyarenko, V. S. Serov, L. C. Dennis, C. Hanretty, K. L. Giovanetti, Brian Raue, K. A. Griffioen, E. L. Isupov, Z. W. Zhao, M. Bellis, Larry Weinstein, R. S. Hakobyan, S. Strauch, J. Hardie, H. G. Juengst, D. P. Watts, D. Doughty, H. Avakian, R. De Vita, D. G. Ireland, L. El Fassi, Michael L. Williams, V. Crede, M. MacCormick, Shifeng Chen, W. Kim, D. G. Jenkins, I. Niculescu, H. Egiyan, C. Paterson, G. Niculescu, A. V. Skabelin, A.V. Stavinsky, M. R. Niroula, J. R. Calarco, R. De Masi, A. Cazes, Maryam Moteabbed, Bernhard Mecking, B. Zhao, K. V. Dharmawardane, P. Mattione, S. Anefalos Pereira, W. J. Briscoe, E. Pasyuk, S. Boiarinov, B. M. Preedom, Latifa Elouadrhiri, Gerard Gilfoyle, S. McAleer, J. D. Kellie, R. C. Minehart, Kei Moriya, D. J. Tedeschi, F. X. Girod, L. Blaszczyk, C. A. Meyer, S. A. Dytman, D. Sokhan, G. V. Fedotov, J. Kuhn, J. T. Goetz, K. Park, J. Salamanca, I. Bedlinskiy, Laird Kramer, H. S. Jo, F. W. Hersman, B. McKinnon, Lorenzo Zana, J. W C McNabb, J. P. Santoro, V. Batourine, V. P. Kubarovsky, D. P. Weygand, D. Branford, O. Pogorelko, Giovanni Ricco, M. Mirazita, J. M. Laget, Atilla Gonenc, F. Sabatié, N. Gevorgyan, B. B. Niczyporuk, R. W. Gothe, J. W. Price, N. Pivnyuk, H. Hakobyan, Gerald Feldman, G. Rosner, R. Nasseripour, C. Salgado, B. E. Stokes, G. S. Adams, M. Bektasoglu, K. Joo, P. Stoler, C. Butuceanu, Michael Vineyard, K. Hicks, N. Markov, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, U. Thoma, P. Corvisiero, A. I. Ostrovidov, K. S. Egiyan, Volker D. Burkert, A. S. Biselli, and K. Mikhailov
Subjects: Physics, Nuclear reaction, Reaction mechanism, Particle physics, 010308 nuclear & particles physics, Partial wave analysis, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, Delta baryon, Chemical kinetics, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The reaction 2H(e,e'p)n has been studied with full kinematic coverage for photon virtuality 1.75 NN transition is the primary contribution at higher momenta.
Published: 2007

7. Experimental study of exclusive 2H(e,e'p)n reaction mechanisms at high Q2

Author: K S, Egiyan, G, Asryan, N, Gevorgyan, K A, Griffioen, J M, Laget, S E, Kuhn, G, Adams, M J, Amaryan, P, Ambrozewicz, M, Anghinolfi, G, Audit, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, S, Barrow, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, L, Blaszczyk, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, A, Cazes, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Cords, P, Corvisiero, D, Crabb, V, Crede, J P, Cummings, N, Dashyan, R, De Masi, R, De Vita, E, De Sanctis, P V, Degtyarenko, H, Denizli, L, Dennis, A, Deur, K V, Dharmawardane, R, Dickson, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, S, Dytman, O P, Dzyubak, H, Egiyan, L, El Fassi, L, Elouadrhiri, P, Eugenio, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, R, Fersch, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, C I O, Gordon, R W, Gothe, M, Guidal, M, Guillo, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, K, Hafidi, H, Hakobyan, R S, Hakobyan, C, Hanretty, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, N, Kalantarians, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, Z, Krahn, L H, Kramer, V, Kubarovsky, J, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, Ji, Li, K, Livingston, H Y, Lu, M, Maccormick, C, Marchand, N, Markov, P, Mattione, S, McAleer, B, McKinnon, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, K, Moriya, S A, Morrow, M, Moteabbed, J, Mueller, E, Munevar, G S, Mutchler, P, Nadel-Turonski, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, G V, O'Rielly, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, S, Anefalos Pereira, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, J, Salamanca, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, D, Sokhan, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, P, Stoler, S, Strauch, M, Taiuti, D J, Tedeschi, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, D P, Watts, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z W, Zhao
Abstract: The reaction 2H(e,e'p)n has been studied with full kinematic coverage for photon virtuality 1.75Q25.5 GeV2. Comparisons of experimental data with theory indicate that for very low values of neutron recoil momentum (p(n)100 MeV/c) the neutron is primarily a spectator and the reaction can be described by the plane-wave impulse approximation. For 100p(n)750 MeV/c, proton-neutron rescattering dominates the cross section, while Delta production followed by the NDelta--NN transition is the primary contribution at higher momenta.
Published: 2007

8. Measurement of theN→Δ+(1232)Transition at High-Momentum Transfer byπ0Electroproduction

Author: L. C. Smith, B. Zhao, B. S. Ishkhanov, G. E. Dodge, P. V. Degtyarenko, V. Gyurjyan, I. Niculescu, D. Lawrence, M. Battaglieri, M. R. Niroula, J. Zhang, R. Fatemi, H. Bagdasaryan, A. V. Vlassov, L. Todor, T. Lee, F. W. Hersman, C. Marchand, V. Sapunenko, D. Protopopescu, R. A. Schumacher, I. Bedliski, Dinko Pocanic, B. M. Preedom, Inna Aznauryan, S. Pozdniakov, M. Garçon, Michael Wood, C. I O Gordon, S. Bültmann, L. Morand, Avraham Klein, R. Bradford, M. Khandaker, V. S. Serov, J. Lachniet, A. Tkabladze, B. L. Berman, Lorenzo Zana, J. P. Santoro, B. E. Stokes, Alexei V. Klimenko, E. Wolin, J. P. Cummings, S. Strauch, H. Egiyan, S. E. Kuhn, L. M. Qin, J. R. Calarco, G. S. Adams, M. Guidal, K. Park, H. S. Jo, Gerald Feldman, Y. Ilieva, R. A. Miskimen, B. McKinnon, V. P. Kubarovsky, Barry Ritchie, C. Salgado, M. Kossov, G. V. O'Rielly, S. A. Morrow, J. Kuhn, O. Pogorelko, C. Djalali, C. Tur, Baile Zhang, D. Doughty, L. C. Dennis, W. Kim, Rakhsha Nasseripour, N. Markov, B. E. Bonner, D. Branford, J. P. Ball, Y. Prok, H. Avakian, M. Holtrop, G. Niculescu, M. Bellis, Shifeng Chen, Ji Li, M. Mirazita, Latifa Elouadrhiri, J. M. Laget, R. C. Minehart, R. S. Hakobyan, N. A. Baltzell, C. A. Meyer, M. Guillo, E. De Sanctis, V. Batourine, K. Livingston, D. G. Jenkins, M. D. Mestayer, G. V. Fedotov, D. I. Sober, Sylvain Bouchigny, F. Sabatié, P. Ambrozewicz, S. Stepanyan, Michael L. Williams, K. A. Griffioen, Laird Kramer, P. Rossi, D. G. Crabb, N. Guler, S. Boiarinov, W. J. Briscoe, J. T. Goetz, E. Polli, Elton Smith, P. Eugenio, M. Taiuti, E. Pasyuk, D. P. Weygand, P. L. Cole, S. Barrow, S. McAleer, J. Langheinrich, S. S. Stepanyan, M. Anghinolfi, S. A. Philips, James Mueller, H. Denizli, F. X. Girod, U. Thoma, S. A. Dytman, J. D. Kellie, P. D. Rubin, P. Coltharp, Y. G. Sharabian, S. Mehrabyan, A. Cazes, Bernhard Mecking, D. Heddle, A. I. Ostrovidov, K. V. Dharmawardane, I. I. Strakovsky, I. Hleiqawi, G. Rosner, M. M. Ito, J. J. Melone, G. Riccardi, A. Deur, A. V. Skabelin, D. G. Ireland, R. DeVita, J. W C McNabb, S. L. Careccia, Michael Vineyard, Volker D. Burkert, W. K. Brooks, C. Butuceanu, J. W. Price, G. S. Mutchler, B. B. Niczyporuk, K. L. Giovanetti, M. Osipenko, N. Pivnyuk, J. Napolitano, Larry Weinstein, Gerard Gilfoyle, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, M. Nozar, Victor Mokeev, A. S. Biselli, R. W. Gothe, G. Ricco, M. Amarian, P. Stoler, Friedrich Klein, K. Hicks, Brian Raue, K. S. Egiyan, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, K. Mikhailov, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Federico Ronchetti, P. Corvisiero, G. Gavalian, S. Tkachenko, N. Benmouna, M. Ripani, H. G. Juengst, A.V. Stavinsky, D. J. Tedeschi, S. Niccolai, J. Hardie, L. Guo, M. Ungaro, K. Joo, D. Cords, A. Yegneswaran, and R. J. Feuerbach
Subjects: Physics, Proton, 010308 nuclear & particles physics, Momentum transfer, Scalar (mathematics), Solid angle, General Physics and Astronomy, Resonance, 01 natural sciences, Helicity, Nuclear physics, Amplitude, 0103 physical sciences, Magnetic form factor, 010306 general physics
Abstract: We report a new measurement of the exclusive electroproduction reaction gamma*_p --> pi0_p to explore the evolution from soft nonperturbative physics to hard processes via the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the N --> Delta transition. 9000 differential cross section data points cover W from threshold to 1.4 GeV/c2, 4pi center-of-mass solid angle, and Q2 from 3 to 6 GeV2/c2, the highest yet achieved. It is found that the magnetic form factor G^*M decreases with Q2 more steeply than the proton magnetic form factor, the ratio E1+/M1+ is small and negative, indicating strong helicity nonconservation, and the ratio S1+/M1+ is negative, while its magnitude increases with Q2.
Published: 2006

9. Search forΘ++Pentaquarks in the Exclusive Reactionγp→K+K−p

Author: H. Avakian, P. Eugenio, M. Taiuti, Shifeng Chen, M. Battaglieri, P. Stoler, R. Bradford, G. Rosner, R. Nasseripour, J. Lachniet, W. J. Briscoe, E. Wolin, R. A. Schumacher, E. Pasyuk, G. Ricco, A. Tkabladze, P. Collins, J. J. Melone, E. Clinton, K. Hicks, L. Guo, M. Ungaro, L. Gan, J. P. Ball, K. S. Egiyan, Y. Prok, M. Y. Gabrielyan, B. E. Stokes, J. T. Goetz, R. S. Hakobyan, Ashot Gasparian, C. I O Gordon, M. Bellis, K. Mikhailov, L. C. Smith, Elton Smith, M. Guidal, K. Joo, R. A. Niyazov, S. Niccolai, V. Mokeev, B. S. Ishkhanov, Sylvain Bouchigny, A. Yegneswaran, E. De Sanctis, S. Bültmann, M. F. Vineyard, D. G. Crabb, L. Morand, O. Glamazdin, M. Anghinolfi, M. Holtrop, J. Kuhn, M. R. Niroula, P. Rossi, J. P. Cummings, Alexei V. Klimenko, Cynthia Marie Hadjidakis, J. Hardie, J. P. Santoro, S. Stepanyan, Friedrich Klein, Hong Lu, Michael Wood, Maryam Moteabbed, Bernhard Mecking, P. L. Cole, J. Donnelly, D. I. Sober, F. X. Girod, G. Asryan, R. De Vita, Y. G. Sharabian, O. P. Dzyubak, K. V. Dharmawardane, H. G. Juengst, K. Hafidi, Barry Ritchie, J. Pierce, Avraham Klein, Brian Raue, Daniel S. Carman, V. S. Serov, P. Nadel-Turonski, Tsutomu Mibe, Michael Dugger, M. Kossov, I. Nakagawa, V. Crede, V. Sapunenko, B. B. Niczyporuk, A.V. Stavinsky, Dinko Pocanic, C. E. Hyde-Wright, K. Park, H. O. Funsten, J. R. Calarco, V. Gyurjyan, N. Pivnyuk, N. A. Baltzell, I. I. Strakovsky, R. W. Gothe, M. Khandaker, S. E. Kuhn, Latifa Elouadrhiri, P. Coltharp, A. V. Vlassov, T. Lee, R. C. Minehart, C. A. Meyer, J. Zhang, Sergey Kuleshov, Hall Crannell, D. J. Tedeschi, U. Thoma, M. Nozar, G. V. Fedotov, M. M. Ito, V. P. Kubarovsky, H. Bagdasaryan, A. Deur, K. A. Griffioen, C. Tur, M. Osipenko, S. A. Morrow, Atilla Gonenc, C. Djalali, B. Zhao, J. Langheinrich, O. Pogorelko, S. S. Stepanyan, I. Bedlinskiy, D. P. Weygand, J. W. Price, W. K. Brooks, W. Kim, G. E. Dodge, J. D. Kellie, V. Mochalov, P. Ambrozewicz, F. W. Hersman, Federico Ronchetti, G. Niculescu, P. V. Degtyarenko, G. Gavalian, S. Tkachenko, N. Benmouna, M. MacCormick, I. Niculescu, D. Lawrence, M. Ripani, I. Hleiqawi, G. Riccardi, S. L. Careccia, R. De Masi, Nikolay Shvedunov, G. S. Mutchler, Gerard Gilfoyle, D. G. Jenkins, K. L. Giovanetti, C. Butuceanu, Larry Weinstein, D. Doughty, Laird Kramer, S. Strauch, H. Egiyan, K. Livingston, D. S. Dale, A. I. Ostrovidov, N. Baillie, J. Goett, R. A. Miskimen, B. McKinnon, D. G. Ireland, D. Branford, M. Mirazita, J. M. Laget, N. Guler, Volker D. Burkert, A. S. Biselli, E. N. Golovach, N. Markov, Y. Ilieva, V. Batourine, F. Sabatié, D. Protopopescu, S. Pozdniakov, M. Garçon, B. L. Berman, C. Paterson, L. Todor, Lorenzo Zana, H. S. Jo, C. Salgado, Ji Li, M. D. Mestayer, E. L. Isupov, Michael L. Williams, S. Boiarinov, and A. Teymurazyan
Subjects: Physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, 01 natural sciences, Pentaquark, Baryon, Particle decay, Pair production, Isospin, 0103 physical sciences, Production (computer science), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The reaction {gamma}p{yields}pK{sup +}K{sup -} was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a {theta}{sup ++} pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK{sup +} invariant mass spectrum. No statistically significant evidence of a {theta}{sup ++} was found. Upper limits on the total and differential cross section for the reaction {gamma}p{yields}K{sup -}{theta}{sup ++} were obtained in the mass range from 1.5 to 2.0 GeV/c{sup 2}, with an upper limit for a narrow resonance with a mass M{sub {theta}{sup ++}}=1.54 GeV/c{sup 2} of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the {theta}{sup ++} width {gamma}{sub {theta}{sup ++}}
Published: 2006

10. Search for theΘ+Pentaquark in theγd→ΛnK+Reaction Measured with the CLAS Spectrometer

Author: A. V. Vlassov, T. Lee, J. Lachniet, A. Tkabladze, E. De Sanctis, D. I. Sober, Shifeng Chen, G. Ricco, M. Khandaker, J. P. Cummings, K. S. Egiyan, K. Park, R. S. Hakobyan, Maryam Moteabbed, B. L. Berman, Bernhard Mecking, V. Mokeev, D. Doughty, J. T. Goetz, Y. Ilieva, K. Mikhailov, K. V. Dharmawardane, L. El Fassi, V. Crede, Nikolay Shvedunov, Laird Kramer, J. Kuhn, L. Guo, M. Ungaro, V. Sapunenko, Dinko Pocanic, M. Kossov, V. P. Kubarovsky, J. R. Calarco, S. E. Kuhn, Airton Deppman, Latifa Elouadrhiri, P. Nadel-Turonski, O. Pogorelko, R. C. Minehart, Friedrich Klein, C. A. Meyer, C. Paterson, L. C. Smith, Tsutomu Mibe, C. Tur, B. S. Ishkhanov, K. Joo, R. A. Niyazov, Jonathan Mellor, M. Bektasoglu, Brian Raue, H. Avakian, M. MacCormick, G. V. Fedotov, A. Yegneswaran, Elton Smith, M. F. Vineyard, M. Anghinolfi, J. Donnelly, I. Hleiqawi, S. L. Careccia, M. Battaglieri, V. Batourine, M. R. Niroula, Y. G. Sharabian, V. Gyurjyan, M. Osipenko, G. Asryan, O. P. Dzyubak, G. Gavalian, K. Livingston, S. Tkachenko, K. L. Giovanetti, N. Benmouna, B. Carnahan, F. Sabatié, M. Ripani, P. Eugenio, S. Strauch, J. Zhang, N. Markov, R. DeVita, Larry Weinstein, D. P. Weygand, W. J. Briscoe, E. Pasyuk, S. Niccolai, Alexei V. Klimenko, H. Bagdasaryan, M. Taiuti, Cynthia Marie Hadjidakis, R. Bradford, D. P. Watts, W. Kim, Federico Ronchetti, I. I. Strakovsky, J. Hardie, Sylvain Bouchigny, G. S. Mutchler, H. G. Juengst, N. Guler, Michael Dugger, S. A. Morrow, H. O. Funsten, C. Djalali, P. Coltharp, G. Niculescu, P. Rossi, Barry Ritchie, S. Anefalos Pereira, A.V. Stavinsky, M. M. Ito, A. Deur, P. L. Cole, P. Ambrozewicz, P. Collins, D. J. Tedeschi, W. K. Brooks, P. Stoler, M. Bellis, D. Protopopescu, J. J. Melone, Michael Wood, K. Hafidi, S. Pozdniakov, M. Garçon, I. Bedlinskiy, K. Hicks, V. S. Serov, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, N. A. Baltzell, K. A. Griffioen, J. D. Kellie, B. E. Stokes, G. S. Adams, U. Thoma, R. A. Schumacher, C. I O Gordon, S. Bültmann, L. Morand, S. Stepanyan, J. Pierce, Avraham Klein, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, A. I. Ostrovidov, R. De Masi, D. G. Ireland, Volker D. Burkert, A. S. Biselli, G. Rosner, R. Nasseripour, Gerard Gilfoyle, Hall Crannell, Daniel S. Carman, C. E. Hyde-Wright, B. Zhao, Hovanes Egiyan, Sergey Kuleshov, N. Baillie, M. Nozar, R. A. Miskimen, B. McKinnon, D. Branford, M. Mirazita, M. Guidal, F. W. Hersman, M. Holtrop, Hong Lu, J. de Oliveira Echeimberg, J. Langheinrich, S. S. Stepanyan, Ji Li, R. W. Gothe, M. D. Mestayer, Z. W. Zhao, E. L. Isupov, Michael L. Williams, S. Boiarinov, G. Riccardi, C. Butuceanu, D. G. Jenkins, E. Wolin, J. P. Ball, L. Todor, B. M. Preedom, Y. Prok, F. X. Girod, Lorenzo Zana, J. P. Santoro, D. G. Crabb, H. Hakobyan, H. S. Jo, Gerald Feldman, C. Salgado, N. Dashyan, Atilla Gonenc, and J. W. Price
Subjects: Physics, Nuclear physics, Baryon, Nuclear reaction, Particle physics, Spectrometer, Hadron, General Physics and Astronomy, Nuclear Experiment, Nucleon, Lambda, Lambda baryon, Pentaquark
Abstract: For the first time, the reaction gamma d -> Lambda n K+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Lab, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant mass distribution. The upper limit on the gamma d -> Lambda Theta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
Published: 2006

11. Search for theΘ+Pentaquark in the Reactionγd→pK−K+n

Author: L. Guo, M. Ungaro, J. Lachniet, A. Tkabladze, E. Wolin, K. Joo, R. A. Niyazov, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, J. P. Ball, Y. Prok, S. Strauch, M. MacCormick, I. Hleiqawi, J. Langheinrich, Gerard Gilfoyle, Michael Vineyard, G. E. Dodge, S. S. Stepanyan, H. Egiyan, S. L. Careccia, G. Ricco, B. Zhao, D. G. Crabb, V. Mokeev, Sylvain Bouchigny, P. V. Degtyarenko, G. Rosner, R. Nasseripour, A. V. Vlassov, F. X. Girod, R. S. Hakobyan, M. Y. Gabrielyan, A. I. Ostrovidov, P. Rossi, R. A. Miskimen, K. L. Giovanetti, Lorenzo Zana, J. P. Santoro, Y. Ilieva, J. Kuhn, B. McKinnon, I. Niculescu, D. G. Ireland, H. S. Jo, Gerald Feldman, D. Lawrence, M. Guidal, Barry Ritchie, R. De Masi, F. W. Hersman, G. S. Mutchler, Volker D. Burkert, A. S. Biselli, M. Holtrop, C. Salgado, R. A. Schumacher, P. Nadel-Turonski, Tsutomu Mibe, Friedrich Klein, D. Branford, Atilla Gonenc, Larry Weinstein, J. W. Price, P. Coltharp, Brian Raue, N. A. Baltzell, B. E. Stokes, M. Bellis, V. Crede, P. Eugenio, Ashot Gasparian, Elton Smith, K. A. Griffioen, M. Mirazita, M. D. Mestayer, Hong Lu, S. Niccolai, M. Taiuti, Latifa Elouadrhiri, I. I. Strakovsky, M. M. Ito, S. Bültmann, J. R. Calarco, C. A. Meyer, J. Donnelly, G. Asryan, Daniel S. Carman, G. Gavalian, A. Deur, P. Collins, M. Khandaker, M. Kossov, Michael L. Williams, G. V. Fedotov, C. E. Hyde-Wright, M. Anghinolfi, S. Tkachenko, S. Stepanyan, S. Boiarinov, O. P. Dzyubak, N. Benmouna, M. Ripani, H. G. Juengst, E. De Sanctis, D. Doughty, L. C. Smith, M. Osipenko, Sergey Kuleshov, W. K. Brooks, J. D. Kellie, Federico Ronchetti, J. Pierce, Avraham Klein, M. Nozar, D. I. Sober, D. P. Weygand, B. S. Ishkhanov, Y. G. Sharabian, A.V. Stavinsky, C. Butuceanu, P. L. Cole, D. Protopopescu, R. W. Gothe, A. Teymurazyan, B. L. Berman, W. Kim, Maryam Moteabbed, G. Niculescu, D. J. Tedeschi, Bernhard Mecking, I. Nakagawa, U. Thoma, I. Bedlinskiy, V. Sapunenko, Z. W. Zhao, D. G. Jenkins, Michael Dugger, H. O. Funsten, M. R. Niroula, S. Pozdniakov, M. Garçon, C. Paterson, S. E. Kuhn, V. Batourine, M. Battaglieri, C. Tur, L. Gan, N. Baillie, K. Livingston, F. Sabatié, Laird Kramer, D. S. Dale, Shifeng Chen, B. B. Niczyporuk, R. Bradford, K. S. Egiyan, N. Guler, K. Mikhailov, J. T. Goetz, N. Pivnyuk, P. Stoler, K. Hicks, S. A. Morrow, C. Djalali, P. Ambrozewicz, R. DeVita, H. Avakian, W. J. Briscoe, E. Pasyuk, Michael Wood, V. S. Serov, K. Park, V. P. Kubarovsky, and O. Pogorelko
Subjects: Physics, Baryon, Nuclear physics, Particle physics, Meson, Hadron, General Physics and Astronomy, Resonance, Nuclear Experiment, Lambda baryon, Nucleon, Lambda, Pentaquark
Abstract: A search for the Theta+ in the reaction gammad --> pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta+ production in the mass range of 1.52-1.56 GeV/c2 for the gammad --> pK-Theta+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta+ production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamman --> K-Theta+ reaction is estimated to be a factor of 10 higher, i.e., approximately 3 nb (95% C.L.).
Published: 2006

12. Search for Theta++ pentaquarks in the exclusive reaction gammap--K+K-p

Author: V, Kubarovsky, M, Battaglieri, R, De Vita, J, Goett, L, Guo, G S, Mutchler, P, Stoler, D P, Weygand, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, V, Batourine, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, S, Chen, E, Clinton, P L, Cole, P, Collins, P, Coltharp, D, Crabb, H, Crannell, V, Crede, J P, Cummings, R, De Masi, D, Dale, E, De Sanctis, P V, Degtyarenko, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, H, Funsten, M Y, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, O, Glamazdin, J T, Goetz, E, Golovach, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, V, Gyurjyan, C, Hadjidakis, K, Hafidi, R S, Hakobyan, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, H, Lu, M, MacCormick, N, Markov, B, McKinnon, B A, Mecking, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mochalov, V, Mokeev, L, Morand, S A, Morrow, M, Moteabbed, P, Nadel-Turonski, I, Nakagawa, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, and B, Zhao
Abstract: The reaction gammap --pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Theta++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++)0.1 MeV/c2.
Published: 2006

13. Erratum:η′Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV [Phys. Rev. Lett.96, 062001 (2006)]

Author: Laird Kramer, Dinko Pocanic, G. S. Mutchler, S. E. Kuhn, G. Rosner, Stephen Taylor, Yordanka Ilieva, M. D. Mestayer, J. J. Manak, P. Eugenio, M. Osipenko, Shifeng Chen, M. Taiuti, S. Boiarinov, B. M. Preedom, M. Guidal, G. Niculescu, K. Beard, K. Livingston, K. S. Egiyan, M. Holtrop, R. A. Schumacher, Lorenzo Zana, Frank Klein, K. Mikhailov, M. Guillo, J. T. Goetz, J. Langheinrich, S. A. Philips, K. A. Griffioen, V. Batourine, D. G. Ireland, V. Crede, S. A. Morrow, P. Rubin, L. Elouadrhiri, A.V. Stavinsky, H. S. Jo, Gerald Feldman, J. R. Calarco, N. Guler, G. Gavalian, C. Djalali, G. Audit, C. E. Hyde-Wright, R. J. Feuerbach, M. Bektasoglu, J. Shaw, N. A. Baltzell, I. I. Strakovsky, B. Carnahan, F. Sabatié, K. Wang, B. E. Stokes, G. S. Adams, D. J. Tedeschi, V. Mokeev, J. P. Cummings, J. Hu, E. Wolin, P. Ambrozewicz, Michael Wood, A. Deur, J. Donnelly, G. Asryan, S. Barrow, O. P. Dzyubak, R. A. Niyazov, H. Juengst, V. S. Serov, R. A. Miskimen, B. McKinnon, I. Bedlinskiy, M. Anghinolfi, G. V. O'Rielly, J. P. Ball, Y. Prok, M. Kossov, Andreas Klein, K. V. Dharmawardane, M. Nozar, P. Corvisiero, James Mueller, Rakhsha Nasseripour, K. S. Dhuga, D. Branford, J. P. Santoro, M. Bellis, E. S. Smith, Marco A. Huertas, D. S. Carman, A. Coleman, H. R. Weller, Roy Thompson, D. Protopopescu, T. A. Forest, D. G. Jenkins, J. D. Kellie, Y. G. Sharabian, Cynthia Marie Hadjidakis, E. De Sanctis, M. Mirazita, J. M. Laget, M. Battaglieri, P. Collins, M. Spraker, V. Gyurjyan, A. I. Ostrovidov, P. Stoler, A. C S Lima, K. Park, L. C. Smith, S. Pozdniakov, M. Garçon, B. S. Ishkhanov, P. L. Cole, Michael Vineyard, A. Shafi, Mark Richard James Williams, S. Stepanyan, Sylvain Bouchigny, R. Bradford, B. A. Mecking, P. Rossi, R. DeVita, J. Zhang, V. P. Kubarovsky, D. G. Crabb, Michael Dugger, Volker D. Burkert, H. Egiyan, J. Pierce, J. W C McNabb, K. Hicks, W. Kim, Clarisse Tur, P. Nadel-Turonski, H. Bagdasaryan, J. W. Price, V. Sapunenko, Valeria Muccifora, A. Empl, O. Pogorelko, A. S. Biselli, P. Dragovitsch, D. I. Sober, S. McAleer, F. X. Girod, Tsutomu Mibe, B. L. Berman, H. O. Funsten, S. Niccolai, L. M. Qin, Gerard Gilfoyle, B. B. Niczyporuk, William Brooks, U. Thoma, L. C. Dennis, B. E. Bonner, P. Coltharp, N. Pivnyuk, K. Lukashin, J. Napolitano, Hall Crannell, H. Avakian, M. M. Ito, J. Hardie, S. Strauch, Jens H. Kuhn, C. Paterson, Nicola Bianchi, L. C. Maximon, C. Marchand, M. Klusman, J. Lachniet, A. Tkabladze, L. Guo, M. Ungaro, G. E. Dodge, D. Rowntree, P. V. Degtyarenko, K. Kim, S. Bültmann, W. J. Briscoe, E. Pasyuk, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, N. Baillie, S. A. Dytman, R. S. Hakobyan, R. Fatemi, A. Yegneswaran, D. Lawrence, A. V. Vlassov, Kwangsoo Kim, G. Riccardi, C. Butuceanu, S. Tkachenko, N. Benmouna, T. Lee, M. Ripani, Carlos A. Salgado, G. Ricco, Brian Raue, Federico Ronchetti, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, D. Doughty, H. Denizli, D. Heddle, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, E. Anciant, M. Khandaker, I. Hleiqawi, S. L. Careccia, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Nuclear physics, Meson production, Photon, Proton, General Physics and Astronomy
Published: 2006

14. Search for the Theta+ Pentaquark in the gammad--DeltanK+ reaction measured with the CLAS spectrometer

Author: S, Niccolai, M, Mirazita, P, Rossi, N A, Baltzell, D S, Carman, K, Hicks, B, McKinnon, T, Mibe, S, Stepanyan, D J, Tedeschi, G, Adams, P, Ambrozewicz, S, Anefalos Pereira, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bektasoglu, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Boiarinov, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, B, Carnahan, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Crabb, H, Crannell, V, Crede, J P, Cummings, N, Dashyan, P V, Degtyarenko, R, De Masi, A, Deppman, E, De Sanctis, A, Deur, R, Devita, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, El Fassi, L, Elouadrhiri, P, Eugenio, G, Fedotov, G, Feldman, H, Funsten, M, Garçon, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, L, Guo, V, Gyurjyan, C, Hadjidakis, K, Hafidi, H, Hakobyan, R S, Hakobyan, J, Hardie, F W, Hersman, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, E L, Isupov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, H, Lu, M, MacCormick, N, Markov, B A, Mecking, J, Mellor, J J, Melone, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, M, Moteabbed, G S, Mutchler, P, Nadel-Turonski, J, Napolitano, R, Nasseripour, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, J, de Oliveira Echeimberg, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, N V, Shvedunov, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, B E, Stokes, P, Stoler, I I, Strakovsky, S, Strauch, M, Taiuti, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, D P, Watts, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z, Zhao
Abstract: For the first time, the reaction gammad--DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad--DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
Published: 2006

15. Search for the Theta+ pentaquark in the reaction gammad --pK-K+n

Author: B, McKinnon, K, Hicks, N A, Baltzell, D S, Carman, M D, Mestayer, T, Mibe, M, Mirazita, S, Niccolai, P, Rossi, S, Stepanyan, D J, Tedeschi, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, V, Batourine, M, Battaglieri, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, S, Chen, P L, Cole, P, Collins, P, Coltharp, D, Crabb, V, Crede, D, Dale, R, De Masi, R, DeVita, E, De Sanctis, P V, Degtyarenko, A, Deur, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, G, Feldman, H, Funsten, M, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, J T, Goetz, A, Gonenc, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, L, Guo, V, Gyurjyan, R S, Hakobyan, F W, Hersman, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, M, Kossov, L H, Kramer, V, Kubarovsky, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J, Langheinrich, D, Lawrence, K, Livingston, H, Lu, M, MacCormick, B A, Mecking, C A, Meyer, K, Mikhailov, R, Miskimen, V, Mokeev, S A, Morrow, M, Moteabbed, G S, Mutchler, I, Nakagawa, P, Nadel-Turonski, R, Nasseripour, G, Niculescu, I, Niculescu, B B, Niczyporuk, M R, Niroula, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, B E, Stokes, P, Stoler, I I, Strakovsky, S, Strauch, M, Taiuti, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, D P, Weygand, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, B, Zhao, and Z, Zhao
Abstract: A search for the Theta+ in the reaction gammad --pK-K+n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta+ resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta+ production in the mass range of 1.52-1.56 GeV/c2 for the gammad --pK-Theta+ reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta+ production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamman --K-Theta+ reaction is estimated to be a factor of 10 higher, i.e., approximately 3 nb (95% C.L.).
Published: 2006

16. Measurement of Two- and Three-Nucleon Short-Range Correlation Probabilities in Nuclei

Author: D. Doughty, J. Langheinrich, E. Pasyuk, P. Nadel-Turonski, L. M. Qin, Tsutomu Mibe, K. Mikhailov, Y. Prok, H. Denizli, M. Klusman, N. A. Baltzell, V. Batourine, B. Carnahan, K. A. Griffioen, K. S. Egiyan, P. Coltharp, G. Ricco, Victor Mokeev, R. A. Schumacher, C. Bultuceanu, Cynthia Marie Hadjidakis, Michael Dugger, K. Park, Daniel S. Carman, H. O. Funsten, Friedrich Klein, S. Tkachenko, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, S. Bültmann, T. A. Forest, Bernhard Mecking, V. P. Kubarovsky, K. V. Dharmawardane, C. E. Hyde-Wright, J. Donnelly, G. Asryan, O. P. Dzyubak, M. M. Ito, P. Eugenio, M. Taiuti, S. Stepanyan, J. D. Kellie, B. E. Stokes, C. Peterson, G. S. Adams, Alexei V. Klimenko, R. Miskimen, Sergey Kuleshov, M. Bektasoglu, J. Pierce, R. J. Feuerbach, A. Empl, O. Pogorelko, Avraham Klein, L. C. Dennis, P. Corvisiero, K. Joo, L. C. Smith, Elton Smith, B. E. Bonner, R. A. Niyazov, J. Yun, M. Battaglieri, D. J. Tedeschi, H. Avakian, M. Guidal, Barry Ritchie, J. R. Calarco, B. S. Ishkhanov, N. Guler, E. De Sanctis, Federico Ronchetti, David Jenkins, A. Yegneswaran, R. Bradford, G. Gavalian, R. DeVita, J. W C McNabb, Hall Crannell, F. W. Hersman, P. Stoler, M. Anghinolfi, M. Holtrop, W. Kim, James Mueller, N. Benmouna, M. Ripani, Latifa Elouadrhiri, S. Strauch, P. L. Cole, J. Lachniet, E. Golovatch, D. I. Sober, R. C. Minehart, C. A. Meyer, Michael Vineyard, P. D. Rubin, G. E. Dodge, A. Tkabladze, Y. G. Sharabian, G. V. Fedotov, G. Rosner, B. B. Niczyporuk, Misak Sargsian, M. Bellis, P. Dragovitsch, D. Rowntree, Mark Strikman, P. V. Degtyarenko, R. Fatemi, J. Zhang, R. Suleiman, S. Taylor, G. Niculescu, S. A. Dytman, N. Pivnyuk, V. Sapunenko, Dinko Pocanic, A. V. Vlassov, J. Hu, D. P. Weygand, J. Kuhn, T. Lee, G. S. Mutchler, I. Niculescu, S. Niccolai, L. C. Maximon, M. Khandaker, Roy Thompson, S. E. Kuhn, D. Lawrence, S. A. Morrow, C. Djalali, M. Guillo, C. Tur, J. Hardie, J. Shaw, Shifeng Chen, R. W. Gothe, P. Ambrozewicz, M. D. Mestayer, H. Egiyan, W. K. Brooks, K. Y. Kim, A.V. Stavinsky, J. T. Goetz, E. Polli, V. Gyurjyan, Marco A. Huertas, Michael Wood, V. S. Serov, Michael L. Williams, Sylvain Bouchigny, I. Bedlinskiy, S. Boiarinov, B. M. Preedom, Lorenzo Zana, J. P. Santoro, H. S. Jo, C. Salgado, A. I. Ostrovidov, D. G. Ireland, Gerard Gilfoyle, Volker D. Burkert, A. S. Biselli, B. McKinnon, H. G. Juengst, K.H. Hicks, D. Branford, M. Mirazita, J. M. Laget, N. Gevorgyan, Laird Kramer, N. Baillie, E. Wolin, J. P. Ball, D. G. Crabb, Kwangsoo Kim, Jim Napolitano, G. Riccardi, B. A. Raue, N. Dashyan, I. Hleiqawi, S. L. Careccia, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, S. McAleer, F. X. Girod, Y. Ilieva, Hovhannes Baghdasaryan, J. W. Price, J. P. Cummings, Rakhsha Nasseripour, L. Todor, D. Protopopescu, S. Pozdniakov, G. V. O'Rielly, K. Livingston, and P. Rossi
Subjects: Physics, Nuclear physics, Helium-4, Scattering, Helium-3, Carbon-12, General Physics and Astronomy, Nuclear force, Electron, Atomic physics, Nucleon, Electron scattering
Abstract: The ratios of inclusive electron scattering cross sections of {sup 4}He, {sup 12}C, and {sup 56}Fe to {sup 3}He have been measured at 1 1.4 GeV{sup 2}, the ratios exhibit two separate plateaus, at 1.5 2.25. This pattern is predicted by models that include 2- and 3-nucleon short-range correlations (SRC). Relative to A=3, the per-nucleon probabilities of 3-nucleon SRC are 2.3, 3.1, and 4.4 times larger for A=4, 12, and 56. This is the first measurement of 3-nucleon SRC probabilities in nuclei.
Published: 2006

17. Search forΘ+(1540)Pentaquark in High-Statistics Measurement ofγp→K¯0K+nat CLAS

Author: S. A. Morrow, C. Djalali, G. E. Dodge, P. V. Degtyarenko, P. Ambrozewicz, K. A. Griffioen, I. Niculescu, D. Lawrence, R. W. Gothe, R. A. Schumacher, J. Donnelly, G. Asryan, Ashot Gasparian, C. I O Gordon, Hall Crannell, S. Bültmann, P. Eugenio, L. Morand, O. P. Dzyubak, U. Thoma, A. V. Vlassov, S. Stepanyan, M. Bellis, J. Pierce, Avraham Klein, B. E. Stokes, P. Nadel-Turonski, T. Lee, Tsutomu Mibe, S. Niccolai, V. Gyurjyan, Federico Ronchetti, H. Avakian, M. Taiuti, J. Hardie, Y. Ilieva, V. Batourine, G. Ricco, J. Zhang, M. Y. Gabrielyan, G. S. Mutchler, J. P. Cummings, H. G. Juengst, M. Osipenko, L. C. Smith, H. Bagdasaryan, F. X. Girod, Gerard Gilfoyle, R. De Vita, A.V. Stavinsky, K. S. Egiyan, B. S. Ishkhanov, J. Langheinrich, J. Lachniet, A. Tkabladze, K. Mikhailov, A. Teymurazyan, I. Hleiqawi, Sylvain Bouchigny, D. J. Tedeschi, E. De Sanctis, J. J. Melone, B. Zhao, Friedrich Klein, Brian Raue, M. Kossov, N. A. Baltzell, F. Sabatié, I. Bedlinskiy, B. B. Niczyporuk, J. Goett, R. A. Miskimen, B. McKinnon, P. Rossi, D. I. Sober, V. V. Mochalov, N. Pivnyuk, Lorenzo Zana, S. L. Careccia, R. S. Hakobyan, Daniel S. Carman, K. V. Dharmawardane, D. G. Ireland, C. E. Hyde-Wright, J. R. Calarco, Sergey Kuleshov, M. Nozar, W. J. Briscoe, E. Pasyuk, P. Stoler, I. Nakagawa, L. Guo, M. Ungaro, M. Battaglieri, K. Joo, R. A. Niyazov, R. Bradford, B. A. Mecking, S. S. Stepanyan, A. Yegneswaran, D. Protopopescu, D. Branford, S. Pozdniakov, M. Garçon, M. Mirazita, J. M. Laget, K. Livingston, D. S. Dale, F. W. Hersman, G. Rosner, R. Nasseripour, J. Kuhn, J. P. Santoro, H. S. Jo, C. Salgado, J. D. Kellie, P. Coltharp, M. M. Ito, Atilla Gonenc, J. W. Price, K. L. Giovanetti, Larry Weinstein, Laird Kramer, M. Khandaker, K. Hicks, N. Guler, S. Strauch, K. Park, E. N. Golovach, M. Guidal, H. Egiyan, N. Baillie, E. Clinton, D. G. Jenkins, B. L. Berman, V. Mokeev, M. Holtrop, V. P. Kubarovsky, O. Pogorelko, P. L. Cole, C. Paterson, D. Doughty, Michael Wood, W. Kim, V. S. Serov, G. Niculescu, Cynthia Marie Hadjidakis, L. Todor, Michael Dugger, H. O. Funsten, I. I. Strakovsky, Ji Li, A. I. Ostrovidov, M. D. Mestayer, V. Sapunenko, Dinko Pocanic, Michael L. Williams, A. Deur, S. Boiarinov, Volker D. Burkert, S. E. Kuhn, A. S. Biselli, W. K. Brooks, C. Tur, Latifa Elouadrhiri, Shifeng Chen, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, O. Glamazdin, Alexei V. Klimenko, Barry Ritchie, J. T. Goetz, Elton Smith, L. Gan, M. F. Vineyard, M. Anghinolfi, G. Gavalian, S. Tkachenko, N. Benmouna, M. Ripani, Y. G. Sharabian, G. Riccardi, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, and D. G. Crabb
Subjects: Physics, Particle physics, Luminosity (scattering theory), Hyperon, General Physics and Astronomy, Strangeness, Photon energy, Pentaquark, Baryon, Nuclear physics, Particle decay, Exotic baryon, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The exclusive reaction gammap-->K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)-->nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
Published: 2006

18. Search for Theta+ (1540) Pentaquark in High-Statistics Measurement of gammap--K0K+n at CLAS

Author: M, Battaglieri, R, De Vita, V, Kubarovsky, L, Guo, G S, Mutchler, P, Stoler, D P, Weygand, P, Ambrozewicz, M, Anghinolfi, G, Asryan, H, Avakian, H, Bagdasaryan, N, Baillie, J P, Ball, N A, Baltzell, V, Batourine, I, Bedlinskiy, M, Bellis, N, Benmouna, B L, Berman, A S, Biselli, S, Bouchigny, S, Boiarinov, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, S, Bültmann, V D, Burkert, C, Butuceanu, J R, Calarco, S L, Careccia, D S, Carman, S, Chen, E, Clinton, P L, Cole, P, Coltharp, D, Crabb, H, Crannell, J P, Cummings, D, Dale, E, De Sanctis, P V, Degtyarenko, A, Deur, K V, Dharmawardane, C, Djalali, G E, Dodge, J, Donnelly, D, Doughty, M, Dugger, O P, Dzyubak, H, Egiyan, K S, Egiyan, L, Elouadrhiri, P, Eugenio, G, Fedotov, H, Funsten, M Y, Gabrielyan, L, Gan, M, Garçon, A, Gasparian, G, Gavalian, G P, Gilfoyle, K L, Giovanetti, F X, Girod, O, Glamazdin, J, Goett, J T, Goetz, E, Golovach, A, Gonenc, C I O, Gordon, R W, Gothe, K A, Griffioen, M, Guidal, N, Guler, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, F W, Hersman, K, Hicks, I, Hleiqawi, M, Holtrop, C E, Hyde-Wright, Y, Ilieva, D G, Ireland, B S, Ishkhanov, M M, Ito, D, Jenkins, H S, Jo, K, Joo, H G, Juengst, J D, Kellie, M, Khandaker, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Kossov, L H, Kramer, J, Kuhn, S E, Kuhn, S V, Kuleshov, J, Lachniet, J M, Laget, J, Langheinrich, D, Lawrence, T, Lee, Ji, Li, K, Livingston, B, McKinnon, B A, Mecking, J J, Melone, M D, Mestayer, C A, Meyer, T, Mibe, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mochalov, V, Mokeev, L, Morand, S A, Morrow, P, Nadel-Turonski, I, Nakagawa, R, Nasseripour, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, M, Osipenko, A I, Ostrovidov, K, Park, E, Pasyuk, C, Paterson, J, Pierce, N, Pivnyuk, D, Pocanic, O, Pogorelko, S, Pozdniakov, J W, Price, Y, Prok, D, Protopopescu, B A, Raue, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, G, Rosner, P, Rossi, F, Sabatié, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, E S, Smith, L C, Smith, D I, Sober, A, Stavinsky, S S, Stepanyan, S, Stepanyan, B E, Stokes, I I, Strakovsky, S, Strauch, M, Taiuti, D J, Tedeschi, A, Teymurazyan, U, Thoma, A, Tkabladze, S, Tkachenko, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, L B, Weinstein, M, Williams, E, Wolin, M H, Wood, A, Yegneswaran, L, Zana, J, Zhang, and B, Zhao
Abstract: The exclusive reaction gammap--K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)--nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
Published: 2005

19. Proton Source Size Measurements in theeA→e′ppXReaction

Author: R. A. Schumacher, P. Eugenio, M. Taiuti, C. I O Gordon, Daniel S. Carman, Sylvain Bouchigny, L. Morand, T. A. Forest, G. Audit, C. E. Hyde-Wright, C. A. Meyer, Muccifora, P. Rossi, H. Bagdasaryan, S. Stepanyan, Enzo De Sanctis, G. Asryan, F. Ronchetti, O. P. Dzyubak, R. A. Niyazov, Avraham Klein, M. Bellis, K. Park, L. M. Qin, I. Hleiqawi, A. Tkabladze, S. McAleer, Shifeng Chen, P. Corvisiero, J. Lachniet, D. Rowntree, R. S. Hakobyan, Susan Taylor, D. P. Weygand, R. Fatemi, A. V. Vlassov, K. S. Egiyan, K. Mikhailov, M. Bektasoglu, M. Nozar, S. Simionatto, M. Klusman, E. Polli, B. E. Stokes, G. S. Adams, A. Empl, O. Pogorelko, K. Lukashin, T. Lee, L. C. Smith, G. E. Dodge, Cynthia Marie Hadjidakis, H. Egiyan, K. Joo, Mokeev, K. L. Giovanetti, B. Asavapibhop, B. B. Niczyporuk, N. Pivnyuk, J. Kuhn, Elton Smith, M. Guidal, Chaden Djalali, Daijin Kim, Alexei V. Klimenko, Michael Dugger, M. Spraker, Larry Weinstein, J. W. Price, M. Anghinolfi, C. Cetina, J. Napolitano, Roy Thompson, James Mueller, C. S. Whisnant, Patrick Girard, J. Shaw, P. V. Degtyarenko, K. Kim, Strakovsky, Barry Ritchie, H. O. Funsten, Michael Vineyard, L. Guo, M. Ungaro, L. Todor, R. W. Gothe, S. A. Morrow, M. Holtrop, J. J. Manak, Michael Wood, Raffaella De Vita, V. S. Serov, E. Anciant, P. D. Rubin, Y. G. Sharabian, B. E. Bonner, H. Avakian, Ji Li, R Lednicky, Dinko Pocanic, S. Mehrabyan, K. Y. Kim, G. V. O'Rielly, Thierry Auger, M. Khandaker, Bernhard Mecking, K. V. Dharmawardane, H. Denizli, E. Pasyuk, S. E. Kuhn, D. G. Jenkins, K. Sabourov, J. Langheinrich, U. Thoma, S. S. Stepanyan, S. A. Philips, S. A. Dytman, G. S. Mutchler, G. Riccardi, I. Niculescu, D. Lawrence, Calarco, P. Stoler, C. Butuceanu, J. H. Kelley, G. Ricco, A.V. Stavinsky, D. Doughty, Michael L. Williams, C. Tur, Sapunenko, J. Yun, D. Cords, A. Yegneswaran, D. Heddle, S. Boiarinov, B. M. Preedom, N. Dashyan, R. G. Fersch, A. V. Skabelin, D. I. Sober, P. L. Cole, LS Vorobeyev, Lorenzo Zana, J. P. Santoro, S. O. Nelson, N. Benmouna, M. Ripani, K. Hicks, K. A. Griffioen, K. Wang, J. J. Melone, Friedrich Klein, C. Salgado, J. D. Kellie, Brian Raue, F. W. Hersman, E. Wolin, D. J. Tedeschi, Mestayer, J. P. Ball, Y. Prok, A. Coleman, H. R. Weller, J. P. Cummings, C. Marchand, M. Kossov, D. G. Crabb, Rakhsha Nasseripour, J. Hu, Shalev Gilad, J. W C McNabb, G. Rosner, M. Battaglieri, P. Dragovitsch, S. Niccolai, L.C. Dennis, R. Bradford, J. Hardie, M. Osipenko, F. Sabatié, M. M. Ito, K. Beard, G. Gavalian, Kubarovski, Gyurjyan, W. Kim, G. Niculescu, Batourine, Gerard Gilfoyle, Kim, R. A. Miskimen, H. G. Juengst, G.A. Leksin, D. Branford, M. Mirazita, J. M. Laget, P Ambrozewich, D. Protopopescu, S. Pozdniakov, M. Garçon, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Nicola Bianchi, K. Livingston, N. Guler, G. A. Peterson, R. J. Feuerbach, Laird Kramer, S. Barrow, M. Guillo, L. Elouadrhiri, A. Deur, and W. K. Brooks
Subjects: Nuclear reaction, Baryon, Physics, Proton, Helium-3, Hadron, General Physics and Astronomy, Atomic physics, Nucleon, Isotopes of helium, Lepton
Abstract: Two-proton correlations at small relative momentum q were studied in the e A ( 3 H e , 4 H e , C , F e ) → e ′ p p X reaction at E 0 = 4.46 G e V using the CLAS detector at Jefferson Lab. The enhancement of the correlation function at small q was found to be in accordance with theoretical expectations. Sizes of the emission region were extracted, and proved to be dependent on A and on the proton momentum. The size of the two-proton emission region for He was measured in e A reactions for the first time.
Published: 2004

20. Onset of asymptotic scaling in deuteron photodisintegration

Author: P. Rossi, M. Mirazita, F. Ronchetti, E. De Sanctis, G. Adams, P. Ambrozewicz, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Audit, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, S. Chen, P. L. Cole, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, R. De Vita, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deppman, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, P. Eugenio, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, H. Funsten, M. Gai, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, C. I. O. Gordon, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, R. S. Hakobyan, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, Y. Ilieva, M. M. Ito, D. Jenkins, H. S. Jo, K. Joo, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, A. C. S. Lima, K. Livingston, K. Lukashin, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, J. J. Melone, M. D. Mestayer, C. A. Meyer, K. Mikhailov, R. Miskimen, V. Mokeev, L. Morand, S. A. Morrow, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O'Brien, G. V. O'Rielly, M. Osipenko, A. Ostrovidov, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, G. Rosner, D. Rowntree, P. D. Rubin, F. Sabatié, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. Simionatto, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, B. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, S. Taylor, D. J. Tedeschi, U. Thoma, R. Thompson, A. Tkabladze, L. Todor, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, B. Zhang, and Z. Zhou
Subjects: Physics, Proton, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Strong interaction, 2-BODY PHOTODISINTEGRATION, FOS: Physical sciences, General Physics and Astronomy, Photon energy, High Energy Physics - Experiment, Nuclear physics, Momentum, Baryon, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Photodisintegration, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, Nucleon
Abstract: We investigate the transition from the nucleon-meson to quark-gluon description of the strong interaction using the photon energy dependence of the $d(\gamma,p)n$ differential cross section for photon energies above 0.5 GeV and center-of-mass proton angles between $30^{\circ}$ and $150^{\circ}$. A possible signature for this transition is the onset of cross section $s^{-11}$ scaling with the total energy squared, $s$, at some proton transverse momentum, $P_T$. The results show that the scaling has been reached for proton transverse momentum above about 1.1 GeV/c. This may indicate that the quark-gluon regime is reached above this momentum., Comment: Accepted by PRL; 5 pages, 2 figures
Published: 2004

21. Publisher’s Note: Two-Nucleon Momentum Distributions Measured inHe3(e,e′pp)n[Phys. Rev. Lett.PRLTAO0031-900792, 052303 (2004)]

Author: K. A. Griffioen, Shifeng Chen, G. Gavalian, S. McAleer, Y. Kuang, J. Langheinrich, Cynthia Marie Hadjidakis, S. A. Philips, E. Wolin, E. Polli, Michael Dugger, R. DeVita, H. O. Funsten, J. W C McNabb, S. Strauch, J. P. Ball, Y. Prok, P. L. Cole, D. S. Carman, Dinko Pocanic, V. Gyurjyan, H. Bagdasaryan, J. W. Price, Min Suk Kim, J. R. Calarco, R. A. Schumacher, Frank Klein, S. E. Kuhn, J. P. Cummings, J. Hu, C. A. Meyer, G. S. Mutchler, J. H. Kelley, Stephen Taylor, R. Fatemi, Carlos A. Salgado, C. I O Gordon, Patrick Girard, J. Shaw, Federico Ronchetti, G. Audit, C. E. Hyde-Wright, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, A. V. Vlassov, D. G. Crabb, L. Ciciani, M. Nozar, Michael Wood, G. V. O'Rielly, R. J. Feuerbach, J. Lachniet, L. Morand, D. Rowntree, M. Kossov, T. A. Forest, V. S. Serov, G. Ricco, S. Stepanyan, P. Ambrozewicz, H. Juengst, M. Osipenko, J. R. Ficenec, M. Bektasoglu, Rakhsha Nasseripour, N. Dashyan, D. G. Jenkins, M. Bellis, K. Sabourov, M. Anghinolfi, K. Park, Shalev Gilad, S. Simionatto, E. S. Smith, James Mueller, K. Beard, R. S. Hakobyan, E. De Sanctis, P. Eugenio, L. C. Smith, B. Carnahan, G. E. Dodge, F. Sabatié, D. P. Weygand, M. Guidal, Y. G. Sharabian, Sylvain Bouchigny, Yordanka Ilieva, D. I. Sober, P. Dragovitsch, Ji Li, Brian Raue, P. Rossi, G. Niculescu, Daijin Kim, P. V. Degtyarenko, K. Kim, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, W. Kim, M. Taiuti, N. Pivnyuk, K. L. Giovanetti, B. Asavapibhop, S. Niccolai, A. Empl, O. Pogorelko, M. Holtrop, M. D. Mestayer, J. J. Manak, Clarisse Tur, K. Lukashin, J. Napolitano, L. C. Dennis, I. Niculescu, D. Lawrence, Laird Kramer, Alexei V. Klimenko, Larry Weinstein, B. E. Bonner, Thierry Auger, J. Hardie, H. Avakian, G. Asryan, O. P. Dzyubak, R. A. Niyazov, N. Benmouna, M. Ripani, D. Doughty, K. V. Dharmawardane, S. Boiarinov, S. Mehrabyan, Barry Ritchie, D. Heddle, Kwangsoo Kim, G. Riccardi, William Brooks, Hall Crannell, C. Butuceanu, P. Corvisiero, M. Spraker, C. Cetina, Michael Vineyard, J. D. Kellie, K. S. Dhuga, C. Marchand, B. M. Preedom, J. J. Melone, William Bertozzi, E. Anciant, B. L. Berman, L. M. Qin, E. Pasyuk, M. Khandaker, K. Wang, J. P. Santoro, M. Klusman, S. A. Dytman, Roy Thompson, M. Battaglieri, P. Stoler, A. Coleman, S. O. Nelson, H. Denizli, H. R. Weller, K. Hicks, K. S. Egiyan, R. Bradford, B. A. Mecking, K. Mikhailov, A. V. Skabelin, M. M. Ito, H. Egiyan, S. McLauchlan, C. S. Whisnant, G. S. Adams, L. Todor, D. Protopopescu, S. Pozdniakov, A. Shafi, U. Thoma, Jens H. Kuhn, Nicola Bianchi, K. Livingston, W. Ingram, F. W. Hersman, G. A. Peterson, M. Guillo, S. Barrow, R. W. Gothe, L. Elouadrhiri, R. A. Miskimen, I. I. Strakovsky, L. Guo, M. Ungaro, K. Joo, D. Branford, J. Yun, D. Cords, A. Yegneswaran, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, A.V. Stavinsky, D. J. Tedeschi, Gerard Gilfoyle, Andreas Klein, and Baile Zhang
Subjects: Physics, Momentum (technical analysis), General Physics and Astronomy, Few-body systems, Nucleon, Mathematical physics
Published: 2004

22. Two-Nucleon Momentum Distributions Measured inHe3(e,e′pp)n

Author: S. A. Morrow, C. Djalali, Ji Li, P. Ambrozewicz, M. D. Mestayer, E. Wolin, Susan Taylor, L. C. Smith, S. Strauch, P. Eugenio, M. Bellis, K. Park, S. McLauchlan, J. P. Ball, Y. Prok, H. Denizli, S. Boiarinov, M. Taiuti, M. Eckhause, G. S. Mutchler, C. S. Whisnant, Dinko Pocanic, G. S. Adams, Bernhard Mecking, K. V. Dharmawardane, Sylvain Bouchigny, R. Fatemi, G. Gavalian, Cynthia Marie Hadjidakis, P. Rossi, J. Hu, D. G. Crabb, A. V. Vlassov, A. V. Skabelin, Shalev Gilad, A. Empl, Michael Dugger, O. Pogorelko, H. O. Funsten, G. Riccardi, R. J. Feuerbach, S. E. Kuhn, M. Guidal, K. Lukashin, M. Battaglieri, G. Niculescu, Daijin Kim, J. R. Calarco, R. DeVita, J. W C McNabb, J. J. Manak, S. Mehrabyan, R. Bradford, Hall Crannell, Alexei V. Klimenko, P. Stoler, C. Cetina, Michael Vineyard, M. Holtrop, Barry Ritchie, J. H. Kelley, C. Marchand, J. P. Cummings, L. Guo, M. Ungaro, B. M. Preedom, C. Tur, S. O. Nelson, R. A. Schumacher, B. Carnahan, C. Butuceanu, F. Sabatié, L.C. Dennis, B. B. Niczyporuk, K. A. Griffioen, K. Hicks, M. M. Ito, Patrick Girard, J. Shaw, E. De Sanctis, M. Kossov, C. I O Gordon, U. Thoma, N. Dashyan, J. P. Santoro, J. Kuhn, N. Pivnyuk, M. Osipenko, Michael Wood, D. I. Sober, Rakhsha Nasseripour, K. S. Egiyan, Thierry Auger, J. Napolitano, Roy Thompson, J. Langheinrich, S. A. Philips, C. A. Meyer, K. Beard, L. Morand, T. A. Forest, V. S. Serov, B. E. Bonner, S. Stepanyan, Elton Smith, J. R. Ficenec, H. Avakian, K. Mikhailov, Kalvir S. Dhuga, K. Wang, G. V. O'Rielly, J. D. Kellie, Avraham Klein, R. W. Gothe, C. Salgado, G. E. Dodge, M. Anghinolfi, D. P. Weygand, Daniel S. Carman, P. V. Degtyarenko, K. Kim, James Mueller, B. L. Berman, G. Audit, C. E. Hyde-Wright, E. Pasyuk, L. M. Qin, S. A. Dytman, I. Niculescu, D. Lawrence, P. D. Rubin, N. Benmouna, M. Ripani, Y. G. Sharabian, G. Asryan, O. P. Dzyubak, R. A. Niyazov, M. Klusman, K. Joo, D. G. Jenkins, K. Sabourov, J. Yun, D. Cords, A. Coleman, Baile Zhang, H. R. Weller, P. Corvisiero, M. Nozar, K. Y. Kim, Shifeng Chen, A. Yegneswaran, Y. Kuang, S. McAleer, E. Polli, W. Ingram, V. Gyurjyan, Laird Kramer, H. Bagdasaryan, M. Guillo, Min Suk Kim, J. W. Price, L. Elouadrhiri, I. I. Strakovsky, J. Lachniet, F. W. Hersman, W. K. Brooks, D. Rowntree, M. Bektasoglu, R. S. Hakobyan, D. Doughty, Volker D. Burkert, A. S. Biselli, D. Heddle, William Bertozzi, Hovanes Egiyan, E. Anciant, V. Sapunenko, G. Ricco, Valeria Muccifora, Philip L. Cole, P. Dragovitsch, M. Khandaker, S. Niccolai, J. J. Melone, Friedrich Klein, J. Hardie, Gerard Gilfoyle, Brian Raue, A.V. Stavinsky, D. J. Tedeschi, L. Todor, R. A. Miskimen, H. G. Juengst, D. Protopopescu, L. Ciciani, Federico Ronchetti, D. Branford, S. Pozdniakov, S. Simionatto, M. Mirazita, J. M. Laget, K. L. Giovanetti, B. Asavapibhop, A. Shafi, M. Spraker, Larry Weinstein, Y. Ilieva, Nicola Bianchi, K. Livingston, G. A. Peterson, S. Barrow, and W. Kim
Subjects: Nuclear reaction, Physics, Particle physics, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Kinetic energy, Nuclear physics, Momentum, Baryon, Pair production, Nuclear Experiment, Nucleon, Lepton
Abstract: We have measured the 3He(e,e'pp)n reaction at 2.2 GeV over a wide kinematic range. The kinetic energy distribution for ''fast'' nucleons (p > 250 MeV/c) peaks where two nucleons each have 20% or less, and the third nucleon has most of the transferred energy. These fast pp and pn pairs are back-to-back with little momentum along the three-momentum transfer, indicating that they are spectators. Experimental and theoretical evidence indicates that we have measured distorted two-nucleon momentum distributions by striking the third nucleon and detecting the spectator correlated pair.
Published: 2004

23. Publisher’s Note: Observation of an Exotic Baryon withS=+1in Photoproduction from the Proton [Phys. Rev. Lett.PRLTAO0031-900792, 032001 (2004)]

Author: K. Park, Clarisse Tur, Volker D. Burkert, A. K. Opper, Shifeng Chen, A. S. Biselli, M. Osipenko, U. Thoma, L. C. Smith, K. Beard, S. J. Gaff, R. W. Major, B. Carnahan, F. Sabatié, E. Polli, G. V. O'Rielly, B. M. Preedom, J. Lachniet, D. Rowntree, L. Elouadrhiri, V. Gyurjyan, J. P. Santoro, L. Ciciani, K. A. Griffioen, S. Simionatto, D. G. Jenkins, Roy Thompson, K. Sabourov, Thierry Auger, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Dinko Pocanic, I. I. Strakovsky, G. Gavalian, V. Mokeev, R. S. Hakobyan, Brian Raue, S. E. Kuhn, K. Wang, R. C. Minehart, R. A. Miskimen, C. A. Meyer, J. Langheinrich, E. De Sanctis, V. V. Frolov, J. H. Kelley, Stephen Taylor, H. Bagdasaryan, S. A. Philips, G. S. Adams, F. W. Hersman, S. McAleer, G. A. Peterson, J. P. Cummings, O. P. Dzyubak, R. A. Niyazov, D. Branford, M. Mirazita, J. W. Price, L. Guo, M. Ungaro, S. Barrow, B. L. Berman, John T. O'Brien, W. Kim, M. Kossov, D. I. Sober, P. L. Cole, P. Dragovitsch, J. M. Laget, L. M. Qin, Laird Kramer, H. Egiyan, D. P. Weygand, P. Corvisiero, Alexei V. Klimenko, R. Fatemi, J. R. Ficenec, Rakhsha Nasseripour, L. Todor, D. Protopopescu, William Brooks, A. V. Vlassov, P. Eugenio, M. Taiuti, M. Anghinolfi, S. Strauch, S. Niccolai, Hall Crannell, S. Pozdniakov, M. Garçon, C. S. Whisnant, Federico Ronchetti, James Mueller, M. Spraker, C. Cetina, Frank Klein, G. S. Mutchler, Barry Ritchie, J. Hardie, Michael Vineyard, A. Longhi, J. R. Calarco, R. DeVita, J. W C McNabb, Y. G. Sharabian, R. W. Gothe, M. Guidal, M. Klusman, M. Guillo, N. Benmouna, A.V. Stavinsky, J. J. Melone, A. Weisberg, P. Stoler, J. Hu, K. Joo, C. Marchand, Ji Li, M. Ripani, G. Niculescu, Carlos A. Salgado, S. A. Morrow, P. Rubin, J. Yun, D. Cords, A. Shafi, M. D. Mestayer, P. Heimberg, C. Djalali, D. J. Tedeschi, A. Yegneswaran, Patrick Girard, J. J. Manak, J. Shaw, S. O. Nelson, K. Hicks, Michael Wood, S. Boiarinov, M. Holtrop, Thomas E. Smith, R. A. Schumacher, E. S. Smith, K. S. Egiyan, P. Ambrozewicz, V. S. Serov, K. Mikhailov, Cynthia Marie Hadjidakis, H. Denizli, Sylvain Bouchigny, H. Juengst, Michael Dugger, H. O. Funsten, C. I O Gordon, P. Rossi, L. Farhi, M. Nozar, M. Bellis, M. U. Mozer, L. Morand, T. A. Forest, S. Stepanyan, G. Audit, V. Sapunenko, G. E. Dodge, J. Connelly, A. V. Skabelin, K. V. Dharmawardane, R. J. Feuerbach, P. V. Degtyarenko, K. Kim, V. P. Kubarovsky, Valeria Muccifora, I. Niculescu, D. Lawrence, M. Bektasoglu, A. Empl, B. B. Niczyporuk, O. Pogorelko, D. Hancock, N. Pivnyuk, K. Lukashin, J. Napolitano, L. C. Dennis, Gerard Gilfoyle, Jens H. Kuhn, Nicola Bianchi, H. Avakian, M. M. Ito, W. J. Briscoe, M. Battaglieri, E. Pasyuk, S. A. Dytman, R. Bradford, B. A. Mecking, E. Anciant, M. Khandaker, D. Doughty, D. Heddle, Yordanka Ilieva, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, M. Sargsyan, and D. G. Crabb
Subjects: Nuclear physics, Physics, Particle physics, Proton, Exotic baryon, Hyperon, General Physics and Astronomy
Published: 2004

24. Measurement of the Proton Spin Structure Functiong1(x,Q2)forQ2from 0.15 to1.6 GeV2with CLAS

Author: S. J. Gaff, D. Doughty, M. Seely, G. Ricco, D. Heddle, R. J. Feuerbach, Philip L. Cole, C. S. Whisnant, L. Farhi, Bernhard Mecking, V. Sapunenko, Dinko Pocanic, Valeria Muccifora, K. V. Dharmawardane, C. D. Keith, P. Eugenio, Shalev Gilad, M. Taiuti, M. Guillo, Gerard Gilfoyle, S. E. Kuhn, R. A. Niyazov, John T. O'Brien, S. Strauch, Friedrich Klein, L. C. Dennis, B. E. Bonner, B. Carnahan, F. Sabatié, W. K. Brooks, L. M. Qin, P. Corvisiero, J. H. Kelley, R. S. Hicks, Brian Raue, Jing Zhao, William Bertozzi, C. Tur, S. Mehrabyan, D. Protopopescu, J. P. Cummings, H. R. Weller, Volker D. Burkert, C. Cetina, A. S. Biselli, S. Pozdniakov, M. Garçon, Thierry Auger, J. R. Calarco, F. W. Hersman, K. S. Egiyan, V. Koubarovski, K. Mikhailov, E. Anciant, Michael Vineyard, Baile Zhang, E. Pasyuk, B. M. Preedom, G. V. O'Rielly, L. Elouadrhiri, Z. L. Zhou, C. Butuceanu, M. Kossov, W. Kim, E. Wolin, R. A. Miskimen, S. A. Dytman, M. Ripani, J. P. Santoro, C. E. Hyde-Wright, J. Hu, D. Branford, Rakhsha Nasseripour, M. Khandaker, A. V. Skabelin, G. S. Mutchler, D. G. Jenkins, Susan Taylor, H. Egiyan, K. Sabourov, J. P. Ball, Y. Prok, M. Eckhause, M. Sargsyan, D. G. Crabb, M. Spraker, Y. Ilieva, Patrick Girard, J. Shaw, Michael Wood, M. Mirazita, J. M. Laget, K. Wang, C. Salgado, P. E. Bosted, A. P. Freyberger, Harut Avakian, Y. Kuang, K. Y. Kim, C. Marchand, Laird Kramer, V. S. Serov, S. McAleer, E. Polli, M. Battaglieri, M. Bellis, K. Park, Federico Ronchetti, K. A. Griffioen, Roy Thompson, V. Frolov, Elton Smith, M. Guidal, R. Bradford, M. M. Ito, J. Ficenec, G. Niculescu, L. Ciciani, A. Longhi, M. Klusman, Ji Li, L. Todor, R. Clark, P. Heimberg, Jens H. Kuhn, M. Holtrop, Thomas E. Smith, M. Anghinolfi, M. D. Mestayer, A. Empl, O. Pogorelko, S. Simionatto, J. D. Kellie, S. Stepanyan, Nicola Bianchi, K. Lukashin, Sylvain Bouchigny, K. Livingston, James Mueller, H. Funsten, Cynthia Marie Hadjidakis, K. L. Giovanetti, B. Asavapibhop, P. Rossi, S. Boiarinov, P. D. Rubin, J. W. Price, Michael Dugger, Larry Weinstein, M. Osipenko, Y. G. Sharabian, H. Denizli, Daniel S. Carman, G. Audit, K. Beard, G. A. Peterson, J. Connelly, Kalvir S. Dhuga, Alexei V. Klimenko, S. Barrow, M. Bektasoglu, G. Gavalian, Barry Ritchie, M. Nozar, R. C. Minehart, C. A. Meyer, P. Stoler, S. O. Nelson, K. Hicks, R. Fatemi, A. V. Vlassov, R. De Vita, J. J. Manak, E. De Sanctis, D. I. Sober, A.V. Stavinsky, L. Sorrel, D. J. Tedeschi, V. Gyurjyan, H. Bagdasaryan, D. Hancock, L. Guo, M. Ungaro, P. Dragovitsch, S. Niccolai, K. Joo, J. Yun, J. Hardie, D. Cords, A. Yegneswaran, G. E. Dodge, P. V. Degtyarenko, K. Kim, I. Niculescu, D. Lawrence, R. A. Schumacher, J. Lachniet, D. Rowntree, C. I O Gordon, L. Morand, T. A. Forest, A. Coleman, B. B. Niczyporuk, N. Pivnyuk, S. E. Rock, Avraham Klein, J. Napolitano, W. Major, G. S. Adams, Hall Crannell, G. Riccardi, J. W C McNabb, S. A. Morrow, C. Djalali, U. Thoma, D. P. Weygand, and L. C. Smith
Subjects: Physics, Nuclear physics, Particle physics, Scattering, Proton spin crisis, General Physics and Astronomy, Electron, Nucleon, Parametrization, Resonance (particle physics), Scaling, Sign (mathematics)
Abstract: Double-polarization asymmetries for inclusive $ep$ scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH$_3$ target in the CLAS detector. The polarized structure function $g_1(x,Q^2)$ was extracted throughout the nucleon resonance region and into the deep inelastic regime, for $Q^2 = 0.15 -1.64 $GeV$^2$. The contributions to the first moment $\Gamma_1(Q^2) = \int g_1(x,Q^2)dx$ were determined up to $Q^2=1.2$ GeV$^2$. Using a parametrization for $g_1$ in the unmeasured low $x$ regions, the complete first moment was estimated over this $Q^2$ region. A rapid change in $\Gamma_1$ is observed for $Q^2 < 1 $GeV$^2$, with a sign change near $Q^2 = 0.3 $GeV$^2$, indicating dominant contributions from the resonance region. At $Q^2=1.2$ GeV$^2$ our data are below the pQCD evolved scaling value.
Published: 2003

25. Measurement ofep→e′pπ+π−and Baryon Resonance Analysis

Author: R. Fatemi, A. Cazes, M. U. Mozer, Bernhard Mecking, K. V. Dharmawardane, A. V. Vlassov, J. Hu, M. Battaglieri, R. Bradford, R. De Vita, E. Wolin, J. J. Manak, R. A. Niyazov, B. Carnahan, Jing Zhao, S. A. Philips, E. De Sanctis, Thierry Auger, D. I. Sober, Patrick Girard, J. Shaw, Michael Wood, P. Corvisiero, E. Golovach, J. P. Ball, Y. Prok, V. S. Serov, R. A. Schumacher, Daniel S. Carman, D. Protopopescu, S. Pozdniakov, M. Garçon, M. Eckhause, G. Ricco, G. Audit, Z. L. Zhou, A. Shafi, C. E. Hyde-Wright, Philip L. Cole, M. Taiuti, M. Ripani, Moshe Gai, Friedrich Klein, M. Bektasoglu, R. S. Hicks, Brian Raue, L. Morand, T. A. Forest, Roy Thompson, Avraham Klein, G. E. Dodge, S. A. Morrow, D. G. Crabb, I. I. Strakovsky, C. Djalali, P. V. Degtyarenko, K. Kim, G. S. Adams, B. M. Preedom, M. Spraker, M. Bellis, K. Park, B. L. Berman, I. Niculescu, K. Joo, D. Lawrence, J. P. Santoro, M. Klusman, E. Anciant, M. Guidal, G. Niculescu, W. K. Brooks, L. M. Qin, A. Empl, O. Pogorelko, K. Lukashin, B. E. Bonner, M. Holtrop, U. Thoma, H. Avakian, D. P. Weygand, Dinko Pocanic, Gerald Feldman, A. K. Opper, S. E. Kuhn, W. J. Briscoe, E. Pasyuk, K. Wang, F. W. Hersman, S. A. Dytman, R. A. Miskimen, J. H. Kelley, C. Salgado, M. Khandaker, M. Nozar, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, D. Branford, J. Napolitano, Elton Smith, Ji Li, Cynthia Marie Hadjidakis, M. Mirazita, J. M. Laget, G. V. O'Rielly, Michael Dugger, S. O. Nelson, M. D. Mestayer, L. Elouadrhiri, K. Hicks, M. Anghinolfi, Laird Kramer, J. P. Cummings, James Mueller, S. Boiarinov, K. S. Egiyan, G. Riccardi, J. W C McNabb, V. Sapunenko, P. D. Rubin, F. Ronchetti, Y. G. Sharabian, Valeria Muccifora, K. Mikhailov, D. G. Jenkins, M. Kossov, K. Sabourov, Rakhsha Nasseripour, J. Ficenec, M. Guillo, Gerard Gilfoyle, L. Ciciani, Hall Crannell, W. Kim, Baile Zhang, R. C. Minehart, J. R. Calarco, C. A. Meyer, S. Simionatto, C. Cetina, Michael Vineyard, P. Dragovitsch, Volker D. Burkert, A. S. Biselli, G. V. Fedotov, Y. Kuang, L. Y. Murphy, E. Polli, K. Y. Kim, A. Longhi, S. Niccolai, S. McAleer, C. Marchand, K. L. Giovanetti, B. Asavapibhop, H. Funsten, S. Stepanyan, Sylvain Bouchigny, J. W. Price, P. Rossi, L.C. Dennis, M. M. Ito, L. Todor, J. Hardie, H. Denizli, Larry Weinstein, L. C. Smith, S. J. Gaff, B. S. Ishkhanov, B. P. Quinn, D. Doughty, H. R. Weller, Alexei V. Klimenko, Barry Ritchie, D. Heddle, M. Osipenko, F. Sabatié, K. Beard, A. V. Skabelin, G. Gavalian, V. Mokeev, G. S. Mutchler, K. A. Griffioen, P. Heimberg, J. D. Kellie, Shalev Gilad, R. J. Feuerbach, A.V. Stavinsky, D. J. Tedeschi, J. S. McCarthy, J. Lachniet, D. Rowntree, Jens H. Kuhn, L. Guo, M. Ungaro, Nicola Bianchi, A. Coleman, Susan Taylor, H. Egiyan, C. S. Whisnant, K. Livingston, G. A. Peterson, S. Barrow, J. Yun, D. Cords, A. Yegneswaran, V. Gyurjyan, and H. Bagdasaryan
Subjects: Baryon, Nuclear physics, Physics, Particle physics, Meson production, Resonance analysis, General Physics and Astronomy, Resonance (particle physics)
Abstract: The cross section for the reaction ep→e'ppi(+)pi(-) was measured in the resonance region for 1.4 lt W lt 2.1 GeV and 0.5 lt Q(2) lt 1.5 GeV2/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N* and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P-13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Published: 2003

26. First Measurement of Transferred Polarization in the Exclusivee→p→e′K+Λ→Reaction

Author: L. Guo, M. Ungaro, R. Fatemi, D. S. Armstrong, A. V. Vlassov, R. C. Minehart, C. A. Meyer, G. V. Fedotov, C. Bennhold, A. Coleman, H. R. Weller, V. Sapunenko, Valeria Muccifora, J. Yun, D. Cords, L. Elouadrhiri, D. P. Weygand, Baile Zhang, J. J. Manak, S. A. Morrow, A. Yegneswaran, Gerard Gilfoyle, M. Eckhause, C. Djalali, J. P. Cummings, Susan Taylor, A. K. Opper, P. Dragovitsch, H. Egiyan, H. Denizli, Laird Kramer, R. A. Miskimen, M. Kossov, P. Ambrozewicz, Rakhsha Nasseripour, R. A. Schumacher, S. Niccolai, A. V. Skabelin, Y. Kuang, D. Branford, L. Ciciani, G. S. Adams, K. S. Egiyan, M. Mirazita, J. M. Laget, S. Stepanyan, Sylvain Bouchigny, L. C. Smith, J. Hardie, S. J. Gaff, S. Simionatto, Alexei V. Klimenko, C. S. Whisnant, E. Polli, K. Joo, B. S. Ishkhanov, L. Todor, D. Protopopescu, K. Mikhailov, P. Rossi, Barry Ritchie, K. L. Giovanetti, B. Asavapibhop, S. Pozdniakov, M. Garçon, A. Cazes, M. U. Mozer, M. Guidal, C. Cetina, E. DeSanctis, W. K. Brooks, B. B. Niczyporuk, A.V. Stavinsky, Jing Zhao, M. Spraker, Larry Weinstein, Michael Vineyard, C. I O Gordon, Z. L. Zhou, G. Niculescu, K. V. Dharmawardane, D. J. Tedeschi, Dinko Pocanic, S. E. Kuhn, N. Pivnyuk, J. Napolitano, M. Holtrop, U. Thoma, E. Anciant, Ji Li, J. R. Calarco, L. Morand, K. A. Griffioen, J. H. Kelley, G. V. O'Rielly, T. A. Forest, C. Tur, O. P. Dzyubak, R. A. Niyazov, K. Livingston, M. Khandaker, J. Lachniet, D. G. Jenkins, K. Sabourov, M. D. Mestayer, K. Paschke, D. Rowntree, P. Corvisiero, V. Gyurjyan, Elton Smith, Daniel S. Carman, S. Mehrabyan, S. McAleer, D. Doughty, D. Heddle, S. Boiarinov, Terry Mart, D. I. Sober, Avraham Klein, R. J. Feuerbach, J. R. Ficenec, M. M. Ito, B. M. Preedom, G. Audit, C. E. Hyde-Wright, J. W C McNabb, G. E. Dodge, M. Anghinolfi, R. S. Hakobyan, P. Stoler, James Mueller, J. P. Santoro, J. W. Price, P. D. Rubin, H. Bagdasaryan, J. Hu, E. N. Golovach, G. A. Peterson, S. O. Nelson, P. V. Degtyarenko, K. Hicks, Y. G. Sharabian, M. Bektasoglu, K. Wang, C. Salgado, M. Battaglieri, M. Guillo, S. Barrow, I. Niculescu, D. Lawrence, R. Bradford, B. A. Mecking, Hall Crannell, C. Marchand, Kwangsoo Kim, M. Ripani, G. Riccardi, Cynthia Marie Hadjidakis, Jens H. Kuhn, C. Butuceanu, Michael Dugger, Nicola Bianchi, H. O. Funsten, W. Kim, M. Bellis, K. Park, J. S. McCarthy, K. Y. Kim, A. Longhi, R. Clark, L. Y. Murphy, A. Empl, O. Pogorelko, K. Lukashin, G. Ricco, Philip L. Cole, M. Osipenko, E. Wolin, F. Sabatié, Moshe Gai, F. W. Hersman, Friedrich Klein, K. Beard, M. Nozar, R. S. Hicks, Brian Raue, Kalvir S. Dhuga, Patrick Girard, J. Shaw, Michael Wood, Steven M. Grimes, G. Gavalian, V. Mokeev, J. P. Ball, Federico Ronchetti, Roy Thompson, Y. Prok, V. S. Serov, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, P. Eugenio, M. Taiuti, S. A. Dytman, J. J. Melone, D. G. Crabb, Volker D. Burkert, A. S. Biselli, G. S. Mutchler, L. M. Qin, R. DeVita, Shalev Gilad, M. Klusman, B. Carnahan, P. Heimberg, J. D. Kellie, and Thierry Auger
Subjects: Physics, Quark, Particle physics, Spectrometer, Spins, Nuclear Theory, Quark model, Hyperon, General Physics and Astronomy, Creation and annihilation operators, Particle accelerator, Polarization (waves), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The first measurements of the transferred polarization for the exclusive (e) over right arrow p --> e'K+(U) over right arrow reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q(2) from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the s (s) over bar quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.
Published: 2003

27. First measurement of transferred polarization in the exclusive ep--e'K+Lambda--reaction

Author: D S, Carman, K, Joo, M D, Mestayer, B A, Raue, G, Adams, P, Ambrozewicz, E, Anciant, M, Anghinolfi, D S, Armstrong, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S P, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, M, Bellis, C, Bennhold, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, C, Butuceanu, J R, Calarco, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, R, Clark, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, H, Denizli, L, Dennis, R, DeVita, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, O P, Dzyubak, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, P, Eugenio, R, Fatemi, G, Fedotov, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovach, C I O, Gordon, K, Griffioen, S, Grimes, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, R S, Hakobyan, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, J, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, T, Mart, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, S, Mehrabyan, J J, Melone, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Mokeev, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, K, Paschke, E, Pasyuk, G, Peterson, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, C, Tur, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The first measurements of the transferred polarization for the exclusive e--p--e(')K+Lambda--reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q2 from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the ssmacr; quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.
Published: 2002

28. Publisher’s Note:ηPhotoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.89, 222002 (2002)]

Author: V. V. Frolov, D. Doughty, R. A. Niyazov, John T. O'Brien, D. Heddle, Barry Ritchie, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, P. Dragovitsch, K. A. Griffioen, G. E. Dodge, M. Lucas, P. Corvisiero, D. Hancock, E. S. Smith, Sylvain Bouchigny, P. Rossi, P. V. Degtyarenko, S. Niccolai, Carlos A. Salgado, L. Elouadrhiri, G. Ricco, J. Hardie, K. S. Egiyan, Baile Zhang, R. C. Minehart, C. A. Meyer, G. S. Mutchler, V. Koubarovski, K. Mikhailov, G. Gavalian, A. K. Opper, I. Niculescu, M. M. Ito, I. I. Strakovsky, A.V. Stavinsky, D. Lawrence, M. Spraker, C. Cetina, H. Egiyan, G. V. O'Rielly, E. Wolin, Michael Vineyard, J. P. Cummings, D. P. Weygand, L. Farhi, Y. Kuang, D. J. Tedeschi, C. S. Whisnant, D. G. Jenkins, K. Sabourov, G. P. Capitani, E. Polli, William Brooks, G. S. Adams, R. DeVita, J. W C McNabb, Ji Li, H. Denizli, Hall Crannell, M. U. Mozer, P. Heimberg, M. Witkowski, K. V. Dharmawardane, A. Coleman, P. L. Cole, Cynthia Marie Hadjidakis, Andreas Klein, J. R. Ficenec, S. McAleer, J. D. Kellie, P. Stoler, J. Lachniet, H. R. Weller, M. Kossov, J. R. Calarco, C. Marchand, M. D. Mestayer, J. J. Manak, D. Rowntree, M. Anghinolfi, James Mueller, Michael Dugger, J. Connelly, A. V. Skabelin, K. S. Dhuga, D. Pogorelko, H. O. Funsten, S. O. Nelson, Y. G. Sharabian, Frank Klein, L. C. Smith, Rakhsha Nasseripour, S. J. Gaff, K. Hicks, M. Sanzone-Arenhovel, R. A. Schumacher, S. Boiarinov, B. B. Niczyporuk, B. M. Preedom, S. Strauch, S. A. Philips, W. Kim, N. Pivnyuk, C. I O Gordon, K. Lukashin, J. Napolitano, Moshe Gai, Dinko Pocanic, M. Battaglieri, Shalev Gilad, M. Nozar, S. E. Kuhn, L. Morand, T. A. Forest, B. Carnahan, F. Sabatié, K. L. Giovanetti, B. Asavapibhop, J. H. Kelley, Stephen Taylor, J. P. Ball, Y. Prok, Patrick Girard, R. Bradford, B. A. Mecking, Larry Weinstein, Gerald Feldman, J. Shaw, S. Stepanyan, D. S. Carman, Jens H. Kuhn, A. Longhi, E. Anciant, K. Wang, U. Thoma, Nicola Bianchi, Thierry Auger, Michael Wood, R. S. Hicks, Brian Raue, K. Livingston, V. S. Serov, L. C. Dennis, M. Khandaker, G. Audit, M. Ripani, M. Guillo, C. E. Hyde-Wright, B. L. Berman, L. M. Qin, H. Avakian, R. J. Feuerbach, K. Beard, M. Klusman, D. G. Crabb, G. A. Peterson, W. Major, M. Bektasoglu, S. Barrow, M. Guidal, G. Niculescu, W. J. Briscoe, E. Pasyuk, Federico Ronchetti, M. Holtrop, Thomas E. Smith, S. A. Dytman, L. Todor, J. S. McCarthy, M. Bellis, D. Protopopescu, L. Y. Murphy, S. Pozdniakov, S. Mehrabyan, Z. L. Zhou, R. Clark, A. Shafi, G. Riccardi, J. P. Santoro, Roy Thompson, Jing Zhao, M. Taiuti, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, F. W. Hersman, R. A. Miskimen, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, R. Fatemi, A. V. Vlassov, K. Park, D. I. Sober, Volker D. Burkert, A. S. Biselli, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, E. DeSanctis, V. Gyurjyan, H. Bagdasaryan, and J. W. Price
Subjects: Physics, Nuclear physics, Photon, Proton, General Physics and Astronomy
Published: 2002

29. Measurement of ep--e' ppi+ pi- and baryon resonance analysis

Author: M, Ripani, V D, Burkert, V, Mokeev, M, Battaglieri, R, De Vita, E, Golovach, M, Taiuti, G, Adams, E, Anciant, M, Anghinolfi, B, Asavapibhop, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, K, Beard, M, Bektasoglu, M, Bellis, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, S, Bouchigny, R, Bradford, D, Branford, W J, Briscoe, W K, Brooks, J R, Calarco, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, L, Ciciani, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, H, Denizli, L, Dennis, K V, Dharmawardane, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, R, Fatemi, G, Fedotov, G, Feldman, R J, Feuerbach, J, Ficenec, T A, Forest, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, K, Griffioen, M, Guidal, M, Guillo, L, Guo, V, Gyurjyan, C, Hadjidakis, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B, Ishkhanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, A V, Klimenko, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Lukashin, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, L, Morand, S A, Morrow, M U, Mozer, V, Muccifora, J, Mueller, L Y, Murphy, G S, Mutchler, J, Napolitano, R, Nasseripour, S O, Nelson, S, Niccolai, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, M, Nozar, G V, O'Rielly, A K, Opper, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B, Quinn, B A, Raue, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, J P, Santoro, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, S, Simionatto, A V, Skabelin, E S, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, U, Thoma, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M H, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The cross section for the reaction ep--e(')ppi(+)pi(-) was measured in the resonance region for 1.4W2.1 GeV and 0.5Q21.5 GeV(2)/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N(*) and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P13(1720) resonance or by introducing a new baryon state, not reported in published analyses.
Published: 2002

30. Eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV

Author: R. Fatemi, K. S. Egiyan, V. Koubarovski, A. V. Vlassov, B. Carnahan, F. Sabatié, K. Mikhailov, C. Marchand, M. Taiuti, Thierry Auger, S. A. Morrow, C. Djalali, W. J. Briscoe, E. Pasyuk, M. Lucas, G. Ricco, S. A. Dytman, J. J. Manak, C. E. Hyde-Wright, A.V. Stavinsky, H. R. Weller, Patrick Girard, A. V. Skabelin, G. S. Mutchler, S. Stepanyan, Sylvain Bouchigny, J. Shaw, D. J. Tedeschi, S. McAleer, Philip L. Cole, Moshe Gai, R. A. Niyazov, Michael Wood, B. M. Preedom, V. S. Serov, E. Anciant, J. S. McCarthy, J. P. Santoro, A. K. Opper, M. Sanzone-Arenhovel, John T. O'Brien, D. I. Sober, F. W. Hersman, B. B. Niczyporuk, M. U. Mozer, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, B. L. Berman, Shalev Gilad, P. Rossi, W. Kim, M. Bellis, K. Park, M. Guillo, Friedrich Klein, P. Corvisiero, H. Egiyan, S. Mehrabyan, M. Khandaker, Gerald Feldman, N. Pivnyuk, J. P. Cummings, J. Napolitano, P. Dragovitsch, M. Ripani, R. S. Hicks, Brian Raue, A. Longhi, R. Clark, Roy Thompson, K. Wang, S. Strauch, C. Salgado, O. Pogorelko, D. Protopopescu, H. Funsten, M. Kossov, K. Lukashin, D. Doughty, D. Heddle, M. Klusman, C. S. Whisnant, S. Pozdniakov, L.C. Dennis, J. R. Calarco, M. M. Ito, L. Todor, J. W. Price, S. Niccolai, J. Hardie, R. J. Feuerbach, Rakhsha Nasseripour, P. Stoler, C. Cetina, S. O. Nelson, R. A. Miskimen, Volker D. Burkert, L. C. Smith, A. S. Biselli, K. Beard, S. J. Gaff, Michael Vineyard, K. A. Griffioen, Kalvir S. Dhuga, L. Y. Murphy, M. Battaglieri, G. Riccardi, R. DeVita, J. W C McNabb, E. Wolin, F. Ronchetti, V. Frolov, Ji Li, G. Gavalian, R. Bradford, Cynthia Marie Hadjidakis, D. Branford, J. Ficenec, J. P. Ball, Y. Prok, P. Heimberg, M. Eckhause, Z. L. Zhou, A. Shafi, G. V. O'Rielly, M. D. Mestayer, Michael Dugger, D. G. Jenkins, K. Sabourov, K. L. Giovanetti, B. Asavapibhop, D. G. Crabb, S. Boiarinov, L. Elouadrhiri, Larry Weinstein, M. Spraker, M. Mirazita, J. M. Laget, J. D. Kellie, I. I. Strakovsky, K. Livingston, Baile Zhang, W. K. Brooks, L. M. Qin, Laird Kramer, L. Farhi, Harut Avakian, V. Sapunenko, Valeria Muccifora, Y. Kuang, G. A. Peterson, E. Polli, Dinko Pocanic, S. Barrow, S. E. Kuhn, J. H. Kelley, Gerard Gilfoyle, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, Jens H. Kuhn, Jing Zhao, Nicola Bianchi, Barry Ritchie, R. C. Minehart, C. A. Meyer, S. A. Philips, H. Denizli, K. Hicks, Daniel S. Carman, J. Connelly, G. Audit, M. Bektasoglu, M. Nozar, M. Guidal, G. Niculescu, M. Holtrop, Thomas E. Smith, Hall Crannell, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, L. Morand, R. A. Schumacher, C. I O Gordon, T. A. Forest, Avraham Klein, V. Gyurjyan, H. Bagdasaryan, D. Hancock, W. Major, E. DeSanctis, G. P. Capitani, L. Guo, M. Ungaro, J. Lachniet, D. Rowntree, S. Taylor, G. S. Adams, K. Joo, J. Yun, A. Coleman, D. Cords, A. Yegneswaran, U. Thoma, and D. P. Weygand
Subjects: Physics, Particle physics, Photon, Meson, Proton, media_common.quotation_subject, Quark model, General Physics and Astronomy, Constituent quark, Resonance (particle physics), Asymmetry, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure), media_common
Abstract: Differential cross sections for gammap-->etap have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W=1.75 GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass approximately 1.8 GeV couples to the etaN channel.
Published: 2002

31. Erratum: First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region [Phys. Rev. Lett. 88, 082001 (2002)]

Author: R. De Vita, M. Anghinolfi, V. D. Burkert, G. E. Dodge, R. Minehart, M. Taiuti, H. Weller, G. Adams, M. J. Amaryan, E. Anciant, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, P. Bosted, S. Bouchigny, D. Branford, W. K. Brooks, S. Bueltmann, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, K. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, B. S. Ishkanov, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, K. Livingston, A. Longhi, K. Loukachine, M. Lucas, W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, A. K. Opper, G. V. O'Rielly, M. Osipenko, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, L. Sorrell, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Taylor, D. J. Tedeschi, R. Thompson, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, A. Weisberg, D. P. Weygand, C. S. Whisnant, E. Wolin, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou
Subjects: Physics, media_common.quotation_subject, Pi, General Physics and Astronomy, Resonance, Angular dependence, Atomic physics, Spin (physics), Asymmetry, Helicity, media_common
Published: 2002

32. Q2Dependence of Quadrupole Strength in theγ*p→Δ+(1232)→pπ0Transition

Author: C. Marchand, T. Y. Tung, M. Witkowski, Bernhard Mecking, C. E. Hyde-Wright, K. V. Dharmawardane, M. J. Amaryan, S. Stepanyan, J. Ficenec, Jochen Heisenberg, G. A. Peterson, S. Barrow, K. Y. Kim, S. A. Philips, Jing Zhao, P. Rossi, Patrick Girard, J. Shaw, Nicola Bianchi, G. E. Dodge, G. S. Adams, P. V. Degtyarenko, K. L. Giovanetti, B. Asavapibhop, J. P. Cummings, L. C. Dennis, B. E. Bonner, R. A. Niyazov, M. Guidal, S. McAleer, H. Avakian, G. Niculescu, W. Kim, K. Loukachine, K. Joo, K. A. Griffioen, J. R. Calarco, P. Corvisiero, Z. L. Zhou, Larry Weinstein, R. De Vita, Michael Vineyard, M. Holtrop, Thomas E. Smith, D. Lawrence, Roy Thompson, A. Longhi, R. A. Demirchyan, M. Battaglieri, F. W. Hersman, K. S. Egiyan, William Bertozzi, E. Anciant, M. Kossov, L. Farhi, V. Sapunenko, H. Egiyan, R. A. Schumacher, M. S. Ohandjanyan, D. P. Weygand, Valeria Muccifora, Daniel S. Carman, S. A. Dytman, A. K. Opper, M. Khandaker, M. D. Mestayer, A. Coleman, V. B. Gavrilov, G. Audit, Y. Patois, H. R. Weller, G. Riccardi, Gerard Gilfoyle, J. W C McNabb, M. Taiuti, H. Funsten, M. Klusman, K. Beard, S. Boiarinov, Federico Ronchetti, J. W. Price, D. Doughty, Airton Deppman, S. Whisnant, B. M. Preedom, D. J. Tedeschi, R. A. Miskimen, L. C. Smith, A. V. Skabelin, D. Heddle, P. Stoler, T. A. Forest, R. J. Feuerbach, G. Ricco, G. S. Mutchler, Kalvir S. Dhuga, Kevin Fissum, B. B. Niczyporuk, M. Mirazita, J. M. Laget, O. Pogorelko, Philip L. Cole, B. Carnahan, K. Hicks, N. Pivnyuk, J. Napolitano, Avraham Klein, R. W. Major, Volker D. Burkert, M. Sanzone, A. S. Biselli, S. K. Matthews, G. P. Capitani, Moshe Gai, Shalev Gilad, Thierry Auger, C. Salgado, Friedrich Klein, Inna Aznauryan, C. Djalali, M. Lucas, A. R. Reolon, S. M. Shuvalov, R. S. Hicks, Brian Raue, M. Guillo, D. Rowntree, D. G. Jenkins, L. Elouadrhiri, Hall Crannell, Robert E. Welsh, P. Dragovitsch, M. M. Ito, W. K. Brooks, L. M. Qin, L. Todor, Y. V. Efremenko, S. Taylor, J. Hardie, M. Bektasoglu, A. V. Vlassov, J. J. Manak, E. De Sanctis, D. I. Sober, Barry Ritchie, E. Wolin, Y. Kuang, E. Polli, H. Denizli, Dinko Pocanic, M. Eckhause, M. Sargsyan, S. E. Kuhn, R. C. Minehart, D. G. Crabb, J. H. Kelley, C. A. Meyer, M. Spraker, Michael Dugger, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, M. Ripani, V. Gyurjyan, H. Bagdasaryan, D. Hancock, D. S. Armstrong, J. Yun, D. Cords, and A. Yegneswaran
Subjects: Quark, Physics, Unitarity, 010308 nuclear & particles physics, Nuclear Theory, Scalar (mathematics), General Physics and Astronomy, 01 natural sciences, Nuclear physics, Baryon, Pion, 0103 physical sciences, Quadrupole, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Multipole expansion
Abstract: Models of baryon structure predict a small quadrupole deformation of the nucleon due to residual tensor forces between quarks or distortions from the pion cloud. Sensitivity to quark versus pion degrees of freedom occurs through the Q2 dependence of the magnetic (M1+), electric (E1+), and scalar (S1+) multipoles in the gamma*p-->Delta(+)-->p pi(0) transition. We report new experimental values for the ratios E(1+)/M(1+) and S(1+)/M(1+) over the range Q2 = 0.4-1.8 GeV2, extracted from precision p(e,e(')p)pi(0) data using a truncated multipole expansion. Results are best described by recent unitary models in which the pion cloud plays a dominant role.
Published: 2002

33. First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region

Author: Elton Smith, B. S. Ishkanov, E. Golovatch, M. Ungaro, V. Frolov, M. J. Amaryan, D. S. Armstrong, J. R. Calarco, S. A. Philips, J. Ficenec, L. Ciciani, R. A. Schumacher, Shalev Gilad, R. A. Demirchyan, L. C. Dennis, B. E. Bonner, M. Anghinolfi, James Mueller, T. A. Forest, S. Stepanyan, Avraham Klein, H. Avakian, A.V. Stavinsky, P. D. Rubin, Hall Crannell, Y. G. Sharabian, K. L. Giovanetti, B. Asavapibhop, L. Elouadrhiri, M. Osipenko, M. Klusman, G. E. Dodge, B. B. Niczyporuk, D. J. Tedeschi, K. Beard, Kalvir S. Dhuga, J. P. Cummings, Dinko Pocanic, R. C. Minehart, C. A. Meyer, M. Taiuti, N. Pivnyuk, J. Napolitano, R. J. Feuerbach, J. Lachniet, D. Rowntree, J. Yun, D. Cords, A. Yegneswaran, P. V. Degtyarenko, K. Kim, K. Loukachine, I. Niculescu, D. Lawrence, G. S. Adams, K. Joo, A. Cazes, Bernhard Mecking, M. Guidal, G. Niculescu, E. Pasyuk, C. Marchand, Larry Weinstein, S. A. Dytman, I. I. Strakovsky, G. Gavalian, J. S. McCarthy, K. V. Dharmawardane, R. De Vita, G. V. O'Rielly, G. Asryan, M. Holtrop, Thomas E. Smith, K. Park, M. Kossov, S. E. Kuhn, D. P. Weygand, E. Anciant, R. A. Niyazov, B. Carnahan, J. H. Kelley, D. G. Jenkins, M. Battaglieri, W. K. Brooks, A. K. Opper, A. Empl, O. Pogorelko, P. Dragovitsch, F. Sabatié, Daniel S. Carman, Sylvain Bouchigny, K. Sabourov, Federico Ronchetti, L. M. Qin, L. C. Smith, M. Khandaker, S. J. Gaff, G. Riccardi, J. W C McNabb, E. De Sanctis, P. Corvisiero, Victor Mokeev, C. E. Hyde-Wright, G. Audit, L. Sorrell, Thierry Auger, P. Rossi, Barry Ritchie, Baile Zhang, A. Weisberg, A. R. Reolon, D. Protopopescu, J. Hardie, M. Ripani, Michael Vineyard, Patrick Girard, J. Shaw, S. Pozdniakov, M. Garçon, D. Doughty, M. Bektasoglu, S. McAleer, V. Gyurjyan, C. Djalali, W. Kim, Cynthia Marie Hadjidakis, P. Stoler, H. Denizli, D. Heddle, M. Lucas, V. S. Serov, F. W. Hersman, W. Major, K. A. Griffioen, Y. Kuang, Michael Dugger, S. O. Nelson, Z. L. Zhou, H. Bagdasaryan, A. Shafi, H. Egiyan, K. Hicks, Roy Thompson, D. I. Sober, D. Hancock, E. Polli, J. Connelly, A. Coleman, Stephen M. Rock, K. S. Egiyan, M. Guillo, G. Ricco, Ji Li, C. S. Whisnant, A. Longhi, E. Wolin, K. Mikhailov, H. Funsten, P. Bosted, P. Heimberg, J. Hu, J. P. Ball, Y. Prok, J. W. Price, M. Eckhause, Philip L. Cole, M. D. Mestayer, K. Y. Kim, M. Sargsyan, J. D. Kellie, D. G. Crabb, M. Spraker, G. P. Capitani, Nicola Bianchi, K. Livingston, S. Taylor, S. Bueltmann, G. A. Peterson, S. Barrow, R. Fatemi, A. V. Vlassov, S. Boiarinov, B. M. Preedom, A. V. Skabelin, G. S. Mutchler, Moshe Gai, H. R. Weller, Friedrich Klein, R. S. Hicks, K. Wang, Brian Raue, C. Salgado, J. J. Manak, M. M. Ito, L. Todor, Laird Kramer, Jing Zhao, L. Farhi, V. Sapunenko, Valeria Muccifora, Volker D. Burkert, A. S. Biselli, Gerard Gilfoyle, R. A. Miskimen, D. Branford, M. Mirazita, and J. M. Laget
Subjects: Physics, Nuclear physics, media_common.quotation_subject, Cathode ray, General Physics and Astronomy, Resonance, High Energy Physics::Experiment, Nuclear Experiment, Spin (physics), Asymmetry, Helicity, media_common
Abstract: The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
Published: 2002

34. First measurement of the double spin asymmetry in (--)e(--)p--e(prime)pi(+)n in the resonance region

Author: R, De Vita, M, Anghinolfi, V D, Burkert, G E, Dodge, R, Minehart, M, Taiuti, H, Weller, G, Adams, M J, Amaryan, E, Anciant, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, H, Bagdasaryan, J P, Ball, S, Barrow, M, Battaglieri, K, Beard, M, Bektasoglu, N, Bianchi, A S, Biselli, S, Boiarinov, B E, Bonner, P, Bosted, S, Bouchigny, D, Branford, W K, Brooks, S, Bueltmann, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, L, Ciciani, P L, Cole, A, Coleman, J, Connelly, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, De Sanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, A, Empl, L, Farhi, R, Fatemi, R J, Feuerbach, J, Ficenec, T A, Forest, V, Frolov, H, Funsten, S J, Gaff, M, Gai, M, Garçon, G, Gavalian, S, Gilad, G P, Gilfoyle, K L, Giovanetti, P, Girard, E, Golovatch, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, C, Hadjidakis, D, Hancock, J, Hardie, D, Heddle, P, Heimberg, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, J, Hu, C E, Hyde-Wright, B S, Ishkanov, M M, Ito, D, Jenkins, K, Joo, J H, Kelley, J D, Kellie, M, Khandaker, K Y, Kim, K, Kim, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, J, Lachniet, J M, Laget, D, Lawrence, Ji, Li, K, Livingston, A, Longhi, K, Loukachine, M, Lucas, W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W C, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, M, Mirazita, R, Miskimen, V, Mokeev, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, G, Niculescu, I, Niculescu, B B, Niczyporuk, R A, Niyazov, A K, Opper, G V, O'Rielly, M, Osipenko, K, Park, E, Pasyuk, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, S, Pozdniakov, B M, Preedom, J W, Price, Y, Prok, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, M, Ripani, B G, Ritchie, S, Rock, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, F, Sabatié, K, Sabourov, C, Salgado, V, Sapunenko, M, Sargsyan, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, L, Sorrell, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, I I, Strakovsky, S, Taylor, D J, Tedeschi, R, Thompson, L, Todor, M, Ungaro, M F, Vineyard, A V, Vlassov, K, Wang, L B, Weinstein, A, Weisberg, D P, Weygand, C S, Whisnant, E, Wolin, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The double spin asymmetry in the (--)e(--)p --e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.
Published: 2001

35. Photoproduction of theρ0Meson on the Proton at Large Momentum Transfer

Author: V. Frolov, M. J. Amaryan, V. Mokeev, A. Cazes, J. P. Cummings, R. De Vita, P. Dragovitsch, Roy Thompson, R. Demirchyan, K. V. Dharmawardane, G. Asryan, R. A. Niyazov, M. Kossov, Volker D. Burkert, A. S. Biselli, J. Hardie, K. L. Giovanetti, B. Asavapibhop, R. A. Miskimen, John T. O'Brien, M. Spraker, Larry Weinstein, Laird Kramer, G. S. Adams, B. L. Berman, P. Corvisiero, G. Riccardi, M. Taiuti, M. Battaglieri, Susan Taylor, L. M. Qin, K. Joo, K. Beard, E. Anciant, L. Todor, D. Protopopescu, Kalvir S. Dhuga, K. S. Egiyan, B. A. Mecking, J. R. Calarco, A.V. Stavinsky, M. Klusman, M. M. Ito, H. Egiyan, W. Kim, R. W. Major, E. Wolin, J. W C McNabb, A. P. Freyberger, K. Mikhailov, D. J. Tedeschi, M. Khandaker, D. Branford, K. A. Griffioen, M. Mirazita, Z. L. Zhou, A. Shafi, Dinko Pocanic, L. Farhi, M. Sanzone-Arenhovel, Federico Ronchetti, J. M. Laget, B. B. Niczyporuk, D. Doughty, Shalev Gilad, B. Carnahan, G. Ricco, D. G. Crabb, N. Pivnyuk, D. Heddle, C. S. Whisnant, S. E. Kuhn, J. Napolitano, P. Stoler, A. Coleman, Philip L. Cole, H. R. Weller, Thierry Auger, A. Weisberg, A. R. Reolon, Moshe Gai, K. Sabourov, S. O. Nelson, J. Shaw, K. Hicks, M. Eckhause, P. Rossi, C. Djalali, Michael Wood, M. Lucas, R. J. Feuerbach, Friedrich Klein, R. S. Hicks, Brian Raue, V. S. Serov, V. Sapunenko, Valeria Muccifora, Michael Dugger, J. H. Kelley, F. W. Hersman, H. O. Funsten, M. Guillo, S. McAleer, J. S. McCarthy, A. V. Vlassov, Gerard Gilfoyle, O. Pogorelko, K. Lukashin, L. C. Dennis, L. C. Smith, S. J. Gaff, Nicola Bianchi, H. Avakian, L. Elouadrhiri, G. S. Mutchler, Jing Zhao, W. J. Briscoe, M. Ripani, S. A. Dytman, Elton Smith, E. N. Golovach, G. A. Peterson, W. K. Brooks, S. Barrow, J. R. Ficenec, D. S. Armstrong, M. Anghinolfi, J. Yun, D. Cords, James Mueller, A. Yegneswaran, P. D. Rubin, Y. G. Sharabian, E. DeSanctis, Baile Zhang, J. J. Manak, A. K. Opper, Y. Kuang, V. Gyurjyan, E. Polli, D. I. Sober, J. W. Price, D. Hancock, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, D. P. Weygand, Barry Ritchie, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, S. A. Philips, M. Guidal, M. D. Mestayer, M. Holtrop, Thomas E. Smith, S. Boiarinov, R. A. Schumacher, T. A. Forest, S. Stepanyan, Avraham Klein, Hall Crannell, C. Cetina, C. Marchand, G. E. Dodge, Michael Vineyard, B. M. Preedom, P. V. Degtyarenko, D. Lawrence, G. P. Capitani, C. Salgado, and D. Rowntree
Subjects: Nuclear physics, Physics, Proton, Meson, Momentum transfer, General Physics and Astronomy
Published: 2001

36. Photoproduction of the rho(0) meson on the proton at large momentum transfer

Author: M, Battaglieri, E, Anciant, M, Anghinolfi, R, De Vita, E, Golovach, J M, Laget, V, Mokeev, M, Ripani, G, Adams, M J, Amaryan, D S, Armstrong, B, Asavapibhop, G, Asryan, G, Audit, T, Auger, H, Avakian, S, Barrow, K, Beard, M, Bektasoglu, B L, Berman, N, Bianchi, A S, Biselli, S, Boiarinov, D, Branford, W J, Briscoe, W K, Brooks, V D, Burkert, J R, Calarco, G P, Capitani, D S, Carman, B, Carnahan, A, Cazes, C, Cetina, P L, Cole, A, Coleman, D, Cords, P, Corvisiero, D, Crabb, H, Crannell, J P, Cummings, E, DeSanctis, P V, Degtyarenko, R, Demirchyan, H, Denizli, L, Dennis, K V, Dharmawardane, K S, Dhuga, C, Djalali, G E, Dodge, D, Doughty, P, Dragovitsch, M, Dugger, S, Dytman, M, Eckhause, H, Egiyan, K S, Egiyan, L, Elouadrhiri, L, Farhi, R J, Feuerbach, J, Ficenec, T A, Forest, A P, Freyberger, V, Frolov, H, Funsten, S J, Gaff, M, Gai, S, Gilad, G P, Gilfoyle, K L, Giovanetti, K, Griffioen, M, Guidal, M, Guillo, V, Gyurjyan, D, Hancock, J, Hardie, D, Heddle, F W, Hersman, K, Hicks, R S, Hicks, M, Holtrop, C E, Hyde-Wright, M M, Ito, K, Joo, J H, Kelley, M, Khandaker, W, Kim, A, Klein, F J, Klein, M, Klusman, M, Kossov, L H, Kramer, Y, Kuang, S E, Kuhn, D, Lawrence, M, Lucas, K, Lukashin, R W, Major, J J, Manak, C, Marchand, S, McAleer, J, McCarthy, J W, McNabb, B A, Mecking, M D, Mestayer, C A, Meyer, K, Mikhailov, R, Minehart, M, Mirazita, R, Miskimen, V, Muccifora, J, Mueller, G S, Mutchler, J, Napolitano, S O, Nelson, B B, Niczyporuk, R A, Niyazov, J T, O'Brien, A K, Opper, G, Peterson, S A, Philips, N, Pivnyuk, D, Pocanic, O, Pogorelko, E, Polli, B M, Preedom, J W, Price, D, Protopopescu, L M, Qin, B A, Raue, A R, Reolon, G, Riccardi, G, Ricco, B G, Ritchie, F, Ronchetti, P, Rossi, D, Rowntree, P D, Rubin, K, Sabourov, C, Salgado, M, Sanzone-Arenhovel, V, Sapunenko, R A, Schumacher, V S, Serov, A, Shafi, Y G, Sharabian, J, Shaw, A V, Skabelin, E S, Smith, T, Smith, L C, Smith, D I, Sober, M, Spraker, A, Stavinsky, S, Stepanyan, P, Stoler, M, Taiuti, S, Taylor, D J, Tedeschi, L, Todor, R, Thompson, M F, Vineyard, A V, Vlassov, L B, Weinstein, A, Weisberg, H, Weller, D P, Weygand, C S, Whisnant, E, Wolin, M, Wood, A, Yegneswaran, J, Yun, B, Zhang, J, Zhao, and Z, Zhou
Abstract: The differential cross section, d sigma/dt, for rho(0) meson photoproduction on the proton above the resonance region was measured up to a momentum transfer -t = 5 GeV2 using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The rho(0) channel was extracted from the measured two charged-pion cross sections by fitting the pi(+)pi(-) and p pi(+) invariant masses. The low momentum transfer region shows the typical diffractive pattern expected from Reggeon exchange. The flatter behavior at large -t cannot be explained solely in terms of QCD-inspired two-gluon exchange models. The data indicate that other processes, like quark interchange, are important to fully describe rho photoproduction.
Published: 2001

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