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1. Baryons 2002, Proceedings Of The 9th International Conference On The Structure Of Baryons

Author: Bernhard Mecking, Carl Carlson
Published: 2003

2. Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2

Author: R. A. Schumacher, G. V. O'Rielly, C. D. Keith, Cynthia Marie Hadjidakis, Z. W. Zhao, Chaden Djalali, D. G. Jenkins, Michael Dugger, S. Tkachenko, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, S. Bültmann, L. Morand, M. R. Niroula, T. A. Forest, D. G. Ireland, G. Asryan, Volker D. Burkert, A. S. Biselli, J. Pierce, Elton Smith, M. J. Amaryan, M. MacCormick, O. P. Dzyubak, R. A. Niyazov, I. Hleiqawi, S. L. Careccia, Larry Weinstein, Avraham Klein, E. Golovatch, H. G. Juengst, K. Moriya, Daniel S. Carman, J. Kuhn, Philip L. Cole, S. McAleer, H. Hakobyan, S. Anefalos Pereira, P. D. Rubin, L. Blaszczyk, P. Corvisiero, Y. G. Sharabian, A. Fradi, L. Cheng, G. Audit, A.V. Stavinsky, C. E. Hyde-Wright, F. Sabatié, Nikolay Shvedunov, D. Heddle, P. Stoler, Friedrich Klein, J. P. Cummings, R. De Vita, N. Markov, V. Sapunenko, C. Salgado, Dinko Pocanic, L. Elouadrhiri, N. Kalantarians, S. Stepanyan, K. S. Egiyan, R. C. Minehart, C. A. Meyer, J. Ball, M. Taiuti, S. E. Kuhn, I. I. Strakovsky, M. Bektasoglu, M. Kossov, K. Mikhailov, K.H. Hicks, R. J. Feuerbach, G. V. Fedotov, M. Nozar, A. Deur, I. Popa, V. Crede, J. W. Price, Shifeng Chen, M. Anghinolfi, Laird Kramer, D. P. Watts, H. Egiyan, G. Gavalian, John A. Mueller, L. Casey, B. L. Berman, P. Mattione, B. B. Niczyporuk, G. Rosner, N. Benmouna, N. Pivnyuk, Kwangsoo Kim, J. T. Goetz, M. Mirazita, G. Riccardi, J. R. Calarco, R. A. Miskimen, B. A. Raue, B. McKinnon, W. J. Briscoe, L. M. Qin, R. G. Fersh, P. Eugenio, J. Langheinrich, C. Butuceanu, C. Hanretty, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Ripani, G. Ricco, S. A. Morrow, C. Paterson, Y. Ilieva, Michael Vineyard, Victor Mokeev, M. Klusman, B. M. Preedom, D. Branford, P. Collins, B. Moreno, J. R. Johnstone, Lorenzo Zana, J. P. Santoro, Tsutomu Mibe, Gerald Feldman, J. M. Laget, L. Todor, D. Protopopescu, K. L. Giovanetti, S. V. Kuleshov, C. Marchand, S. Pozdniakov, M. Garçon, M. L. Seely, Ji Li, D. J. Tedeschi, G. E. Dodge, H. Y. Lu, J. Lachniet, I. Bedlinskiy, Marco A. Huertas, A. Tkabladze, M. D. Mestayer, E. L. Isupov, P. V. Degtyarenko, D. Rowntree, K. Livingston, Michael L. Williams, M. Holtrop, R. Suleiman, V. Kuznetsov, D. S. Dale, J. Zhang, S. Boiarinov, D. I. Sober, Gerard Gilfoyle, F. X. Girod, G. S. Mutchler, N. A. Baltzell, I. Niculescu, D. Sokhan, J. Salamanca, K. A. Griffioen, D. Lawrence, M. Guillo, N. Guler, R. De Masi, L. El Fassi, J. W C McNabb, Sylvain Bouchigny, H. Denizli, M. Guidal, M. Battaglieri, J. Hardie, S. Strauch, J. D. Kellie, Z. Krahn, R. Nasseripour, S. Barrow, P. Rossi, R. Dickson, N. Baillie, D. Doughty, V. Gyurjyan, R. Bradford, K. Lukashin, B. E. Stokes, G. S. Adams, H. Bagdasaryan, P. Nadel-Turonski, A. V. Skabelin, K. Joo, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, L. Guo, M. Ungaro, D. P. Weygand, E. Wolin, N. Hassall, M. Bellis, D. G. Crabb, J. Yun, D. Cords, P. Bosted, A. Yegneswaran, N. Dashyan, Y. Prok, Barry Ritchie, E. De Sanctis, H. S. Jo, S. Niccolai, R. Fatemi, A. V. Vlassov, P. Coltharp, R. W. Gothe, M. M. Ito, K. Y. Kim, M. Osipenko, K. Beard, L. C. Smith, E. Munevar, Kalvir S. Dhuga, B. S. Ishkhanov, O. Pogorelko, M. Khandaker, B. Zhao, F. W. Hersman, W. Kim, G. Niculescu, N. Gevorgyan, L. C. Dennis, B. E. Bonner, H. Avakian, D. Sharov, S. A. Dytman, W. K. Brooks, K. Park, V. P. Kubarovsky, J. Shaw, Michael Wood, K. Hafidi, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Heavy baryon chiral perturbation theory, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Nuclear physics, Polarizability, 0103 physical sciences, Sum rule in quantum mechanics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The spin structure functions g 1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q 2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 Q 2 5 GeV 2 and W 3 GeV . The first moments of g 1 for the proton and deuteron are presented – both have a negative slope at low Q 2 , as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ 0 p is also reported. This quantity shows strong Q 2 dependence at low Q 2 . Our analysis of the Q 2 evolution of the first moment of g 1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ 0 p data and Chiral Perturbation calculations for γ 0 p , even at the lowest Q 2 .
Published: 2009

3. Exclusive ρ0 electroproduction on the proton at CLAS

Author: J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, N. Dashyan, V. Sapunenko, G. Ricco, Alexei V. Klimenko, N. A. Baltzell, C. Salgado, Dinko Pocanic, Barry Ritchie, H. Denizli, A. V. Skabelin, K. A. Griffioen, B. Zhao, V. Gyurjyan, A. I. Ostrovidov, R. Fatemi, K. Park, S. E. Kuhn, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, H. G. Juengst, B. E. Stokes, G. S. Adams, G. V. Fedotov, V. P. Kubarovsky, J. Zhang, P. Eugenio, K. P. Adhikari, A. V. Vlassov, D. P. Weygand, G. E. Dodge, H. Y. Lu, M. J. Amaryan, G. V. O'Rielly, S. Niccolai, Z. W. Zhao, V. Mokeev, Y. Ilieva, Ji Li, D. G. Jenkins, C. Tur, Gerard Gilfoyle, Elton Smith, H. Hakobyan, A.V. Stavinsky, J. D. Kellie, M. Guidal, M. MacCormick, I. Hleiqawi, S. L. Careccia, R. De Vita, Friedrich Klein, Brian Raue, P. V. Degtyarenko, M. D. Mestayer, J. P. Didelez, R. Nasseripour, L. Todor, F. W. Hersman, P. Coltharp, E. L. Isupov, J. P. Cummings, W. Gohn, S. A. Morrow, S. McAleer, M. Anghinolfi, P. Nadel-Turonski, D. Sokhan, D. Protopopescu, D. J. Tedeschi, M. Holtrop, Michael L. Williams, P. Collins, K. L. Giovanetti, I. Niculescu, F. X. Girod, L. Blaszczyk, B. Carnahan, James Mueller, D. Lawrence, R. G. Fersch, R. A. Miskimen, B. McKinnon, S. Pozdniakov, M. Garçon, J. J. Melone, M. M. Ito, S. Boiarinov, Larry Weinstein, L. Zana, P. D. Rubin, R. De Masi, D. Keller, I. Bedlinskiy, B. M. Preedom, S. Anefalos Pereira, D. Schott, Y. G. Sharabian, R. A. Schumacher, P. L. Cole, M. Yurov, M. Taiuti, S. Mehrabyan, D. Branford, L. C. Smith, E. Munevar, G. S. Mutchler, B. S. Ishkhanov, Michael Wood, K. Hafidi, L. Graham, M. Kossov, M. E. McCracken, C. I O Gordon, J. M. Laget, V. Kuznetsov, J. Kuhn, E. Hourany, M. Khandaker, V. S. Serov, L. C. Dennis, B. E. Bonner, J. W. Price, Tsutomu Mibe, S. Bültmann, G. Audit, Shifeng Chen, C. Bookwalter, N. Gevorgyan, M. Osipenko, C. E. Hyde-Wright, J. P. Santoro, H. S. Jo, H. Avakian, L. Morand, I. Popa, D. Sharov, T. A. Forest, G. Riccardi, M. R. Niroula, E. De Sanctis, O. Pogorelko, S. Stepanyan, P. Mattione, C. Butuceanu, M. S. Saini, D. Doughty, J. Pierce, M. Ripani, B. L. Berman, Avraham Klein, L. M. Qin, M. Aghasyan, E. Wolin, Sergey Kuleshov, W. J. Briscoe, D. Heddle, J. T. Goetz, D. I. Sober, Kalvir S. Dhuga, M. Bektasoglu, S. A. Dytman, S. Dhamija, M. Nozar, E. Polli, M. Mirazita, C. Paterson, J. P. Ball, R. W. Gothe, Y. Prok, B. Moreno, W. Kim, J. Hardie, Hall Crannell, D. S. Carman, K. Livingston, G. Rosner, C. Marchand, G. Niculescu, D. S. Dale, N. Baillie, S. Park, Sylvain Bouchigny, J. Lachniet, A. Tkabladze, D. G. Crabb, R. Dickson, Michael Vineyard, D. G. Ireland, V. Crede, J. R. Calarco, P. Khetarpal, N. Guler, J. Salamanca, L. El Fassi, J. W C McNabb, S. Barrow, P. Rossi, L. Casey, H. Bagdasaryan, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, C. Hanretty, Laird Kramer, J. R. Johnstone, L. Guo, M. Ungaro, A. Fradi, K. Joo, D. Cords, N. Markov, A. Yegneswaran, K. Hicks, M. Battaglieri, R. Bradford, K. S. Egiyan, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, N. Hassall, M. Bellis, K. Mikhailov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, S. Strauch, D. P. Watts, H. Egiyan, I. I. Strakovsky, A. Deur, W. K. Brooks, R. J. Feuerbach, Cynthia Marie Hadjidakis, M. Guillo, Chaden Djalali, Michael Dugger, L. Cheng, F. Sabatié, Nikolay Shvedunov, N. Kalantarians, G. Gavalian, S. Tkachenko, and N. Benmouna
Subjects: Quark, Physics, REPRESENTATION, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), Proton, Hadron, Parton, VECTOR-MESON ELECTROPRODUCTION, Approx, PHOTONS, QCD, EVOLUTION, High Energy Physics - Experiment, Regge theory, Nuclear physics, Scattering amplitude, GENERALIZED PARTON DISTRIBUTIONS, VIRTUAL COMPTON-SCATTERING, VECTOR-MESON ELECTROPRODUCTION, LARGE MOMENTUM-TRANSFER, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, PHOTONS, QCD, REPRESENTATION, EVOLUTION, LARGE MOMENTUM-TRANSFER, GENERALIZED PARTON DISTRIBUTIONS, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, Nuclear Experiment, VIRTUAL COMPTON-SCATTERING
Abstract: The $e p\to e^\prime p \rho^0$ reaction has been measured, using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross sections are presented. The $W$, $Q^2$ and $t$ dependences of the cross section are compared to theoretical calculations based on $t$-channel meson-exchange Regge theory on the one hand and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the $\approx$ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present., Comment: 29 pages, 29 figures
Published: 2008

4. Twenty years of physics at MAMI --What did it mean?

Author: Bernhard Mecking
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Hadron, Form factor (quantum field theory), Nuclear fusion, Nucleon, Microtron
Abstract: The development over the last twenty years of the physics program and the experimental facilities at the Mainz Microtron MAMI will be reviewed. Ground-breaking contributions have been made to the development of experimental techniques and to our understanding of the structure of nucleons and nuclei.
Published: 2006

5. 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

6. Electro- and photoproduction of ω (783) mesons using CLAS at Jefferson Lab

Author: J.J. Manak, A. Coleman, Bernhard Mecking, Volker D. Burkert, Franz Klein, and H. O. Funsten
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Photon, Proton, Meson, Nuclear Theory, Particle accelerator, Photon energy, Omega, law.invention, Nuclear physics, Angular distribution, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Electro- and photoproduction of {omega}(783) from a proton target have been measured in the CLAS detector at the Thomas Jefferson National Accelerator Facility in Newport News, VA. The photoproduction data were taken over a photon energy range from 0.5 to 2.3 GeV, while the electroproduction data was obtained over a W range of 1.8--2.5 GeV/c{sup 2}. Preliminary acceptance-corrected center-of-mass angular distributions have been examined for both data sets.
Published: 2000

7. The time-of-flight system for CLAS

Author: Elton Smith, K. Loukachine, A. D. Hancock, C. Marchand, J. Distelbrink, L. C. Smith, W. Kim, T.Y. Tung, J. Ficenec, K. MacArthur, G. S. Mutchler, Andrew G. Weisenberger, D. Schutt, Bernhard Mecking, L. Elouadrhiri, Robert E. Welsh, D. A. Jenkins, T. Carstens, F. W. Hersman, M. Guidal, M. Holtrop, Susan Taylor, H. Egiyan, T. P. Smith, and M. Eckhause
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Cosmic ray, Particle accelerator, Particle identification, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, Time of flight, law, Scintillation counter, Instrumentation
Abstract: The time-of-flight system for the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility is described. The system, covering an area of 206-square-meters, is composed of scintillation counters 5.08 cm thick, 15 and 22 cm wide, and lengths which vary from 32 cm at the most forward angle to 450 cm at larger angles. All of the components of the system have been designed to optimize the time resolution. Event timing, achieved by leading-edge discrimination with time-walk correction, has been measured with cosmic rays, a laser pulser, and known particle interactions. The intrinsic time resolution varies from about 80 ps for the short counters to 160 ps for the longer counters. Reconstruction of interacting particles during the first period of operation yields an average time resolution for electrons of 163 ps.
Published: 1999

8. Strange-particle physics at Jefferson Lab

Author: Bernhard Mecking
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Strange quark, Meson, Nuclear Theory, Particle accelerator, Electron, law.invention, Nuclear physics, Electron beam accelerator, law, Physics::Accelerator Physics, Photon beams, Nuclear Experiment, Nucleon
Abstract: The Continuous Electron Beam Accelerator Facility (CEBAF) at the Thomas Jefferson National Accelerator Facility is devoted to the investigation of the electromagnetic structure of mesons, nucleons, and nuclei using high duty-cycle electron and photon beams in the energy range up to 4 GeV. The basic features and the status of the accelerator and the experimental instrumentation are presented. The program to study strange particle physics is discussed, and some specific examples are given.
Published: 1998

9. Measurement of semi-inclusive pi+ electroproduction off the proton

Author: L. C. Smith, E. Munevar, M. H. Wood, Y. Ilieva, M. E. McCracken, P. Nadel-Turonski, E. Wolin, R. J. Feuerbach, B. S. Ishkhanov, G. E. Dodge, Tsutomu Mibe, P. V. Degtyarenko, J. P. Ball, Y. Prok, D. S. Carman, M. R. Niroula, Alexander Ilyichev, O. P. Dzyubak, I. I. Strakovsky, Paolo Rossi, K. S. Egiyan, P. L. Cole, Z. W. Zhao, J. Lachniet, A. Tkabladze, W. Kim, I. Niculescu, R. A. Niyazov, D. G. Crabb, R. S. Hakobyan, L. El Fassi, Elton Smith, A. Deur, G. Niculescu, R. De Masi, B. L. Berman, J. Kuhn, B. McKinnon, W. K. Brooks, G. P. Gilfoyle, K. Livingston, R. Fatemi, N. Markov, A. V. Vlassov, J. P. Cummings, M. Anghinolfi, G. Ricco, B. Zhao, D. J. Tedeschi, S. Niccolai, R. Dickson, Ji Li, Y. G. Sharabian, S. Strauch, D. P. Watts, H. Egiyan, L. M. Qin, C. Paterson, L. Zana, D. Branford, J. M. Laget, M. Khandaker, G. Riccardi, N. Hassall, M. Bellis, Cynthia Marie Hadjidakis, R. De Vita, A. I. Ostrovidov, K. A. Griffioen, N. Guler, F. W. Hersman, J. Hardie, C. Butuceanu, M. J. Amaryan, M. Kossov, Shifeng Chen, E. N. Golovach, Volker D. Burkert, A. S. Biselli, Michael Dugger, J. Langheinrich, H. O. Funsten, H. G. Juengst, Luca Trentadue, M. MacCormick, I. Hleiqawi, M. D. Mestayer, C. Djalali, H. Denizli, P. Eugenio, S. Dytman, A. V. Skabelin, S. L. Careccia, I. Popa, P. Coltharp, R. A. Schumacher, P. Mattione, M. Osipenko, S. Barrow, M. Taiuti, A.V. Stavinsky, S. Anefalos Pereira, P. D. Rubin, R. W. Gothe, Laird Kramer, E. L. Isupov, D. Lawrence, D. Sokhan, M. M. Ito, H. Hakobyan, A. Cazes, J. R. Calarco, C. I O Gordon, K. L. Giovanetti, S. Mehrabyan, Alexei V. Klimenko, J. T. Goetz, R. Miskimen, C. Hanretty, G. V. O'Rielly, E. Polli, Michael L. Williams, Larry Weinstein, M. Mirazita, Kalvir S. Dhuga, J. D. Kellie, P. Collins, Friedrich Klein, F. Sabatié, Nikolay Shvedunov, J. J. Melone, V. Sapunenko, Sylvain Bouchigny, S. Bültmann, L. Todor, Barry Ritchie, Dinko Pocanic, Victor Mokeev, Brian Raue, G. Asryan, E. De Sanctis, M. Battaglieri, I. Bedlinskiy, V. A. Drozdov, S. Stepanyan, S. E. Kuhn, N. A. Baltzell, D. Protopopescu, S. Pozdniakov, M. Garçon, M. F. Vineyard, J. Pierce, Avraham Klein, Z. Krahn, N. Dashyan, S. Boiarinov, U. Thoma, D. I. Sober, R. Bradford, N. Kalantarians, Latifa Elouadrhiri, V. Gyurjyan, G. S. Mutchler, D. G. Ireland, V. Crede, N. Baillie, B. B. Niczyporuk, R. C. Minehart, Kei Moriya, S. McAleer, N. Pivnyuk, B. E. Stokes, J. Napolitano, G. S. Adams, J. Zhang, B. M. Preedom, F. X. Girod, L. Blaszczyk, H. Bagdasaryan, J. P. Santoro, C. Tur, C. A. Meyer, L. Guo, M. Ungaro, G. Gavalian, J. Donnelly, S. Tkachenko, D. Heddle, J. Salamanca, N. Benmouna, G. V. Fedotov, M. Ripani, J. W C McNabb, D. Jenkins, R. Nasseripour, S. A. Morrow, K. Joo, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, A. Yegneswaran, Atilla Gonenc, P. Ambrozewicz, J. W. Price, M. Holtrop, D. P. Weygand, P. Corvisiero, H. S. Jo, Gerald Feldman, Federico A. Ceccopieri, C. Salgado, G. Rosner, M. Guillo, K. Mikhailov, M. Guidal, H. Y. Lu, C. E. Hyde-Wright, P. Stoler, Sergey Kuleshov, M. Bektasoglu, M. Nozar, K. Hicks, S. S. Stepanyan, S. A. Philips, J. Mueller, K. Hafidi, V. S. Serov, K. Park, V. P. Kubarovsky, O. Pogorelko, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, D. Doughty, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Nuclear and High Energy Physics, Proton, DEEP-INELASTIC-SCATTERING, TARGET FRAGMENTATION REGION, TRANSVERSE-MOMENTUM, PARTON DISTRIBUTIONS, AZIMUTHAL ASYMMETRY, PION ELECTROPRODUCTION, CHARGED HADRONS, HARD PROCESSES, LEADING ORDER, CROSS-SECTION, TARGET FRAGMENTATION REGION, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Spectral line, Nuclear physics, Pion, Factorization, 0103 physical sciences, 010306 general physics, Nuclear Experiment, PION ELECTROPRODUCTION, Physics, DEEP-INELASTIC-SCATTERING, 010308 nuclear & particles physics, LEADING ORDER, TRANSVERSE-MOMENTUM, Azimuth, Diquark, CHARGED HADRONS, HARD PROCESSES, PARTON DISTRIBUTIONS, Cathode ray, AZIMUTHAL ASYMMETRY, High Energy Physics::Experiment, CROSS-SECTION
Abstract: Semi-inclusive {pi}{sup +} electroproduction on protons has been measured with the CLAS detector at Jefferson Lab. The measurement was performed on a liquid-hydrogen target using a 5.75 GeV electron beam. The complete five-fold differential cross sections were measured over a wide kinematic range including the complete range of azimuthal angles between hadronic and leptonic planes, {phi}, enabling us to separate the {phi}-dependent terms. Our measurements of the {phi}-independent term of the cross section at low Bjorken x were found to be in fairly good agreement with pQCD calculations. Indeed, the conventional current fragmentation calculation can account for almost all of the observed cross section, even at small {pi}{sup +} momentum. The measured center-of-momentum spectra are in qualitative agreement with high-energy data, which suggests a surprising numerical similarity between the spectator diquark fragmentation in the present reaction and the antiquark fragmentation measured in e{sup +}e{sup -} collisions. We have observed that the two {phi}-dependent terms of the cross section are small. Within our precision the cos2{phi} term is compatible with zero, except for the low-z region, and the measured cos{phi} term is much smaller in magnitude than the sum of the Cahn and Berger effects.
Published: 2009

10. Electroexcitation of the Roper resonance for1.7<Q2<4.5GeV2ine→p→enπ+

Author: B. Zhao, F. W. Hersman, Marco Ripani, S. Dhamija, R. W. Gothe, K. Y. Kim, J. Kuhn, J. P. Santoro, E. De Sanctis, Latifa Elouadrhiri, B. M. Preedom, P. Eugenio, R. C. Minehart, Kei Moriya, D. I. Sober, M. Taiuti, G. Rosner, C. A. Meyer, M. Battaglieri, G. V. Fedotov, P. Collins, J. J. Melone, Lorenzo Zana, R. Bradford, K. Lukashin, J. Shaw, V. Batourine, D. P. Weygand, H. Hakobyan, Friedrich Klein, H. S. Jo, Michael Wood, K. Hafidi, Brian Raue, Gerald Feldman, Elton Smith, R. Fatemi, V. S. Serov, A. V. Vlassov, T. Lee, M. Anghinolfi, P. Coltharp, James Mueller, I. I. Strakovsky, N. A. Baltzell, R. De Vita, P. D. Rubin, A. Cazes, Maryam Moteabbed, C. Salgado, Bernhard Mecking, Y. G. Sharabian, A. Deur, K. A. Griffioen, K. S. Egiyan, K. V. Dharmawardane, Baile Zhang, Alexei V. Klimenko, S. Anefalos Pereira, Z. Krahn, W. K. Brooks, Shifeng Chen, J. D. Kellie, Y. Prok, N. Hassall, M. Bellis, J. Langheinrich, Barry Ritchie, N. Baillie, P. Mattione, M. S. Saini, L. C. Dennis, B. E. Bonner, S. S. Stepanyan, S. A. Philips, R. A. Miskimen, B. McKinnon, H. Avakian, J. T. Goetz, E. Polli, B. L. Berman, D. Sharov, M. Mirazita, D. Branford, K. Livingston, D. S. Dale, Ji Li, L. M. Qin, J. M. Laget, H. Denizli, N. Gevorgyan, C. Paterson, G. Gavalian, W. J. Briscoe, E. Pasyuk, S. Tkachenko, M. D. Mestayer, S. A. Dytman, J. Donnelly, G. Asryan, A. V. Skabelin, N. Benmouna, Gerard Gilfoyle, O. P. Dzyubak, R. A. Niyazov, E. L. Isupov, A. Fradi, D. Sokhan, M. Guillo, V. Crede, Michael L. Williams, W. Gohn, N. Markov, V. Sapunenko, Dinko Pocanic, J. R. Calarco, P. Corvisiero, E. Golovatch, S. Boiarinov, S. E. Kuhn, Charles Hyde, V. P. Kubarovsky, O. Pogorelko, C. Tur, M. J. Amaryan, M. MacCormick, I. Hleiqawi, R. Nasseripour, S. L. Careccia, S. McAleer, F. X. Girod, Laird Kramer, B. E. Stokes, G. S. Adams, J. P. Cummings, Cynthia Marie Hadjidakis, G. E. Dodge, H. Y. Lu, K. L. Giovanetti, L. Blaszczyk, P. V. Degtyarenko, M. Kossov, V. Gyurjyan, K. Joo, I. Popa, Sergey Kuleshov, M. Bektasoglu, Michael Dugger, D. Heddle, M. Nozar, P. Stoler, I. Niculescu, D. Lawrence, J. Zhang, R. De Masi, D. Schott, S. A. Morrow, C. Djalali, R. A. Schumacher, M. Guidal, Larry Weinstein, K. Hicks, M. Holtrop, L. Graham, H. Bagdasaryan, C. I O Gordon, P. Ambrozewicz, S. Bültmann, L. Morand, T. A. Forest, S. Stepanyan, J. Pierce, Avraham Klein, K. Mikhailov, L. Cheng, Nikolay Shvedunov, A. I. Ostrovidov, L. Casey, A. C S Lima, K. Park, N. Kalantarians, B. B. Niczyporuk, D. G. Ireland, Michael Vineyard, N. Pivnyuk, Giovanni Ricco, Atilla Gonenc, E. Wolin, Volker D. Burkert, A. S. Biselli, J. P. Ball, D. S. Carman, D. G. Crabb, J. Salamanca, J. W C McNabb, M. Yurov, J. W. Price, S. Mehrabyan, C. Bookwalter, G. Riccardi, H. Funsten, P. Nadel-Turonski, C. Butuceanu, Tsutomu Mibe, N. Dashyan, K. Hafnaoui, C. Hanretty, G. V. O'Rielly, J. R. Johnstone, Z. W. Zhao, D. Keller, Paolo Rossi, D. G. Jenkins, J. Lachniet, A. Tkabladze, S. Park, Sylvain Bouchigny, D. Rowntree, M. M. Ito, R. S. Hakobyan, L. El Fassi, M. Khandaker, H. G. Juengst, A.V. Stavinsky, D. J. Tedeschi, V. Mokeev, I. Bedlinskiy, L. C. Smith, E. Munevar, B. S. Ishkhanov, M. R. Niroula, V. Kuznetsov, S. Strauch, R. Suleiman, L. Guo, G. S. Mutchler, M. Ungaro, S. Niccolai, J. Hardie, D. Doughty, W. Kim, D. P. Watts, G. Niculescu, J. Yun, D. Cords, H. Egiyan, T. Takeuchi, A. Yegneswaran, M. Osipenko, F. Sabatié, Kalvir S. Dhuga, M. Y. Gabrielyan, R. Dickson, R. J. Feuerbach, N. Guler, Inna Aznauryan, P. L. Cole, S. Barrow, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, Y. Ilieva, and B. Moreno
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Roper resonance, Meson production, 010308 nuclear & particles physics, State (functional analysis), 01 natural sciences, Helicity, Baryon, 0103 physical sciences, Pi, Isobar, 010306 general physics, Ground state
Abstract: The helicity amplitudes of the electroexcitation of the Roper resonance are extracted for $1.7l{Q}^{2}l4.5\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$ from recent high precision JLab-CLAS cross section and longitudinally polarized beam asymmetry data for ${\ensuremath{\pi}}^{+}$ electroproduction on protons at $W=1.15\ensuremath{-}1.69$ GeV. The analysis is made using two approaches, dispersion relations and a unitary isobar model, which give consistent ${Q}^{2}$ behavior of the helicity amplitudes for the ${\ensuremath{\gamma}}^{*}p\ensuremath{\rightarrow}$N(1440)P${}_{11}$ transition. It is found that the transverse helicity amplitude ${A}_{1/2}$, which is large and negative at ${Q}^{2}=0$, becomes large and positive at ${Q}^{2}\ensuremath{\simeq}2\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$, and then drops slowly with ${Q}^{2}$. The longitudinal helicity amplitude ${S}_{1/2}$, which was previously found from CLAS $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}\mathit{ep}{\ensuremath{\pi}}^{0},\mathit{en}{\ensuremath{\pi}}^{+}$ data to be large and positive at ${Q}^{2}=0.4,0.65\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$, drops with ${Q}^{2}$. Available model predictions for ${\ensuremath{\gamma}}^{*}p\ensuremath{\rightarrow}$N(1440)P${}_{11}$ allow us to conclude that these results provide strong evidence in favor of N(1440)P${}_{11}$ as a first radial excitation of the $3q$ ground state. The results of the present paper also confirm the conclusion of our previous analysis for ${Q}^{2}l1$ GeV${}^{2}$ that the presentation of N(1440)P${}_{11}$ as a q$^{3}\mathrm{G}$ hybrid state is ruled out.
Published: 2008

11. First measurement of target and double spin asymmetries fore→p→→epπ0in the nucleon resonance region above theΔ(1232)

Author: F. X. Girod, L. Blaszczyk, Lorenzo Zana, N. Dashyan, H. Hakobyan, E. Munevar, B. Zhao, H. S. Jo, B. S. Ishkhanov, D. Keller, V. Crede, J. W. Price, William Brooks, C. Salgado, J. Kuhn, J. P. Santoro, E. Wolin, J. R. Calarco, J. P. Ball, Y. Prok, D. S. Carman, M. Yurov, G. Gavaliann, D. G. Crabb, J. Langheinrich, S. S. Stepanyan, C. Bookwalter, C. Butuceanu, Shifeng Chen, W. Kim, M. Khandaker, M. R. Niroula, H. Avakian, V. Gyurjyan, R. A. Schumacher, Barry Ritchie, S. A. Morrow, H. G. Juengst, M. Kossov, C. Djalali, D. Sharov, A. Fradi, S. Tkachenko, Maryam Moteabbed, L. Graham, F. Sabatié, P. Eugenio, J. Zhang, Bernhard Mecking, N. Benmouna, S. Dhamija, M. Ripani, I. I. Strakovsky, D. P. Watts, H. Bagdasaryan, A. Tkabladze, M. Taiuti, G. Niculescu, H. Egiyan, S. Bültmann, L. Todor, M. S. Saini, S. Strauch, M. D. Mestayer, A.V. Stavinsky, K. Mikhailov, Z. W. Zhao, T. A. Forest, R. W. Gothe, J. T. Goetz, M. J. Amaryan, G. Ricco, D. J. Tedeschi, E. L. Isupov, D. G. Jenkins, D. Protopopescu, S. Stepanyan, P. Collins, V. Sapunenko, M. MacCormick, I. Hleiqawi, A. Deur, Latifa Elouadrhiri, Michael L. Williams, N. Hassall, M. Bellis, J. Pierce, Kei Moriya, Avraham Klein, Michael Dugger, S. L. Careccia, I. Bedlinskiy, S. Park, C. A. Meyer, N. Markov, L. Casey, W. J. Briscoe, S. Pozdniakov, M. Garçon, G. S. Mutchler, G. V. Fedotov, C. Hanretty, S. Boiarinov, N. A. Baltzell, G. Rosner, B. L. Berman, S. E. Kuhn, E. Pasyuk, K. L. Giovanetti, P. Rossi, V. Kuznetsov, Friedrich Klein, G. E. Dodge, H. Y. Lu, B. B. Niczyporuk, Larry Weinstein, K. A. Griffioen, Brian Raue, E. De Sanctis, P. V. Degtyarenko, M. Battaglieri, Victor Mokeev, J. R. Johnstone, D. Doughty, N. Pivnyuk, L. Guo, P. Mattione, R. J. Feuerbach, L. Cheng, C. Paterson, M. Ungaro, Nikolay Shvedunov, L. El Fassi, I. Niculescu, R. A. Niyazov, D. P. Weygand, R. Bradford, D. Lawrence, Elton Smith, J. D. Kellie, J. Lachniet, D. I. Sober, R. De Masi, D. Schott, S. Niccolai, M. F. Vineyard, P. Stoler, R. Nasseripour, N. Kalantarians, J. Salamanca, K. Joo, Y. G. Sharabian, P. Coltharp, J. W C McNabb, A. V. Vlassov, W. Gohn, Z. Krahn, V. P. Kubarovsky, B. E. Stokes, R. G. Fersch, K. Hicks, A. Yegneswaran, M. M. Ito, O. Pogorelko, Y. Ilieva, N. Baillie, R. De Vita, B. McKinnon, P. L. Cole, D. Branford, S. Anefalos Pereira, G. Asryan, O. P. Dzyubak, M. Osipenko, M. Mirazita, J. M. Laget, N. Gevorgyan, P. Nadel-Turonski, Tsutomu Mibe, Michael Wood, K. Hafidi, P. Bosted, Gerard Gilfoyle, B. Moreno, D. Sokhan, V. S. Serov, K. Livingston, D. S. Dale, R. Dickson, A. I. Ostrovidov, K. Park, N. Guler, D. G. Ireland, Volker D. Burkert, A. S. Biselli, M. Guidal, M. Holtrop, C. E. Hyde-Wright, Sergey Kuleshov, and M. Nozar
Subjects: Physics, Nuclear and High Energy Physics, Roper resonance, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Coupling (probability), 01 natural sciences, Resonance (particle physics), Asymmetry, Nuclear physics, 0103 physical sciences, Invariant mass, 010306 general physics, Nucleon, Spin (physics), media_common
Abstract: DOI: http://dx.doi.org/10.1103/PhysRevC.78.045204 The exclusive channel polarized proton(polarized e,e prime p)pi0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). Longitudinal target and beam-target asymmetries were extracted over a large range of center-of-mass angles of the pi0 and compared to the unitary isobar model MAID, the dynamic model by Sato and Lee, and the dynamic model DMT. A strong sensitivity to individual models was observed, in particular for the target asymmetry and in the higher invariant mass region. This data set, once included in the global fits of the above models, is expected to place strong constraints on the electrocoupling amplitudes A_{1/2} and S_{1/2} for the Roper resonance N(1400)P11, and the N(1535)S11 and N(1520)D13 states.
Published: 2008

12. Electroproduction ofϕ(1020)mesons at1.4⩽Q2⩽3.8GeV2measured with the CLAS spectrometer

Author: M. Guidal, R. Nasseripour, M. Holtrop, I. I. Strakovsky, R. J. Feuerbach, G. V. O'Rielly, Cynthia Marie Hadjidakis, B. Zhao, Z. W. Zhao, D. G. Jenkins, Alexei V. Klimenko, R. De Masi, A. Deur, Michael Dugger, H. O. Funsten, Michael Wood, K. Hafidi, N. Dashyan, B. E. Stokes, G. S. Adams, Barry Ritchie, P. L. Cole, B. M. Preedom, V. S. Serov, C. E. Hyde-Wright, S. McAleer, J. Langheinrich, S. S. Stepanyan, S. A. Philips, L. Blaszczyk, G. Ricco, J. Ball, F. W. Hersman, Sergey Kuleshov, Lorenzo Zana, J. P. Santoro, M. Bektasoglu, M. Nozar, M. Garçon, Elton Smith, M. Battaglieri, J. Salamanca, J. Lachniet, A. Tkabladze, Latifa Elouadrhiri, P. Coltharp, H. Hakobyan, F. Sabatié, H. S. Jo, K. Livingston, D. S. Dale, J. W C McNabb, J. R. Ficenec, N. A. Baltzell, V. Kuznetsov, R. Bradford, R. C. Minehart, Kei Moriya, C. A. Meyer, J. W. Price, M. M. Ito, S. Strauch, V. Mokeev, C. Salgado, L. Cheng, B. L. Berman, L. M. Qin, D. P. Watts, H. Egiyan, K. A. Griffioen, J. P. Cummings, V. Gyurjyan, G. V. Fedotov, S. A. Morrow, M. Anghinolfi, E. De Sanctis, V. P. Kubarovsky, D. Keller, Nikolay Shvedunov, Friedrich Klein, R. Dickson, James Mueller, C. Paterson, D. I. Sober, O. Pogorelko, C. Djalali, E. Munevar, D. P. Weygand, L. C. Smith, M. Kossov, L. C. Dennis, J. Zhang, B. E. Bonner, H. Avakian, Ji Li, M. Guillo, Brian Raue, S. Niccolai, I. Popa, S. Dhamija, N. Hassall, M. Bellis, H. Bagdasaryan, F. X. Girod, B. S. Ishkhanov, S. Park, R. Fatemi, N. Kalantarians, W. Gohn, A. V. Vlassov, J. R. Johnstone, D. Sharov, M. D. Mestayer, Y. G. Sharabian, Sylvain Bouchigny, J. Hardie, H. G. Juengst, J. Kuhn, L. El Fassi, C. Marchand, G. Audit, E. Wolin, H. Denizli, E. L. Isupov, R. De Vita, J. D. Kellie, L. Morand, Michael L. Williams, P. Rossi, N. Guler, William Brooks, Christian Weiss, A.V. Stavinsky, M. R. Niroula, R. W. Gothe, S. Boiarinov, W. Kim, M. Mirazita, W. J. Briscoe, L. Casey, G. Gavalian, C. Hanretty, S. Tkachenko, S. Anefalos Pereira, G. Niculescu, P. Nadel-Turonski, N. Benmouna, J. P. Ball, Tsutomu Mibe, Y. Prok, D. S. Carman, A. V. Skabelin, A. Cazes, Maryam Moteabbed, Hall Crannell, Bernhard Mecking, D. J. Tedeschi, M. Ripani, E. Pasyuk, V. Crede, Shifeng Chen, G. Rosner, K. V. Dharmawardane, J. R. Calarco, S. A. Dytman, I. Bedlinskiy, B. B. Niczyporuk, L. Guo, M. Ungaro, N. Pivnyuk, D. G. Crabb, R. A. Schumacher, M. Khandaker, S. Barrow, P. Mattione, M. S. Saini, P. Eugenio, M. Taiuti, K. Joo, G. S. Mutchler, Michael Vineyard, D. Cords, L. Graham, C. I O Gordon, A. Yegneswaran, M. Yurov, J. T. Goetz, S. Mehrabyan, S. Bültmann, V. Sapunenko, P. Collins, Dinko Pocanic, J. J. Melone, M. Osipenko, S. Procureur, T. A. Forest, C. Bookwalter, G. Riccardi, S. Stepanyan, S. E. Kuhn, Kalvir S. Dhuga, C. Butuceanu, J. Pierce, Avraham Klein, C. Tur, G. E. Dodge, L. Todor, H. Y. Lu, P. V. Degtyarenko, M. J. Amaryan, D. Protopopescu, M. MacCormick, I. Hleiqawi, S. Pozdniakov, I. Niculescu, D. Lawrence, S. L. Careccia, D. Schott, K. L. Giovanetti, Larry Weinstein, D. Doughty, D. Heddle, Y. Ilieva, B. Moreno, R. A. Miskimen, B. McKinnon, D. Branford, J. M. Laget, N. Gevorgyan, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Z. Krahn, N. Baillie, Laird Kramer, Gerard Gilfoyle, D. Sokhan, A. Fradi, N. Markov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, K. S. Egiyan, K. Mikhailov, P. Stoler, and K. Hicks
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Vector meson dominance, 01 natural sciences, Helicity, Gluon, 0103 physical sciences, Exponent, Vector meson, 010306 general physics, Nucleon, Exchange model
Abstract: Electroproduction of exclusive \ensuremath{\phi} vector mesons has been studied with the CLAS detector in the kinematic range $1.4\ensuremath{\leqslant}{Q}^{2}\ensuremath{\leqslant}3.8$ GeV${}^{2},0.0\ensuremath{\leqslant}{t}^{'}\ensuremath{\leqslant}3.6$ GeV${}^{2}$, and $2.0\ensuremath{\leqslant}W\ensuremath{\leqslant}3.0$ GeV. The scaling exponent for the total cross section as $1/({Q}^{2}+{M}_{\ensuremath{\phi}}^{2}){}^{n}$ was determined to be $n=2.49\ifmmode\pm\else\textpm\fi{}0.33$. The slope of the four-momentum transfer ${t}^{'}$ distribution is ${b}_{\ensuremath{\phi}}=0.98\ifmmode\pm\else\textpm\fi{}0.17$ GeV${}^{\ensuremath{-}2}$. Under the assumption of $s$-channel helicity conservation, we determine the ratio of longitudinal to transverse cross sections to be $R=0.86\ifmmode\pm\else\textpm\fi{}0.24$. A two-gluon exchange model is able to reproduce the main features of the data.
Published: 2008

13. Ratios ofN15/C12andHe4/C12inclusive electroproduction cross sections in the nucleon resonance region

Author: K. S. Egiyan, L. Guo, K. Mikhailov, Calarco, P. Stoler, K. Hicks, Susan Taylor, M. Ungaro, C. D. Keith, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, H. Egiyan, P. Corvisiero, C. E. Hyde-Wright, Y. Ilieva, R. A. Miskimen, G. Ricco, M. Amarian, E. Wolin, B. Zhao, B. McKinnon, R. Fatemi, S. Strauch, Laird Kramer, K. Park, B. B. Niczyporuk, P. Dragovitsch, Nikolay Shvedunov, J. P. Ball, Y. Prok, D. S. Carman, K. Joo, L. M. Qin, R. Suleiman, D. Branford, N. Pivnyuk, Shifeng Chen, A. V. Vlassov, Sergey Kuleshov, J. Yun, D. Cords, M. Mirazita, D. G. Crabb, J. M. Laget, M. Bektasoglu, G. S. Mutchler, S. Niccolai, A. Yegneswaran, M. Battaglieri, Niroula, A. Fradi, M. Nozar, N. A. Baltzell, J. Hardie, P. Eugenio, H. G. Juengst, S. A. Morrow, R. De Vita, O. Pogorelko, C. Djalali, Kubarovsky, C. Paterson, Friedrich Klein, K. A. Griffioen, R. J. Feuerbach, N. Markov, K. Livingston, M. Klusman, M. Taiuti, A.V. Stavinsky, N. Kalantarians, Brian Raue, F. W. Hersman, R. Bradford, K. Lukashin, Marco A. Huertas, D. J. Tedeschi, J. Langheinrich, A. I. Ostrovidov, A. C S Lima, J. T. Goetz, J. Shaw, E. Polli, S. S. Stepanyan, Crede, S. A. Philips, P. Collins, D. G. Ireland, Michael Wood, K. Hafidi, I. Bedlinskiy, Batourine, Elton Smith, Gerard Gilfoyle, Mestayer, Volker D. Burkert, V. S. Serov, L. C. Dennis, A. S. Biselli, N. Guler, B. E. Bonner, H. Avakian, B. Carnahan, G. Gavalian, S. Tkachenko, M. Anghinolfi, N. Benmouna, M. Ripani, Kwangsoo Kim, J. Kuhn, J. Zhang, S Anefalos, R. W. Gothe, G. Riccardi, A. Cazes, James Mueller, J. W C McNabb, Maryam Moteabbed, Bernhard Mecking, J. D. Kellie, S. Barrow, C. Butuceanu, K. V. Dharmawardane, E. Pasyuk, H. Bagdasaryan, Mokeev, Cynthia Marie Hadjidakis, E. De Sanctis, P. D. Rubin, K. Y. Kim, Y. G. Sharabian, M. Guidal, S. A. Dytman, R. G. Fersch, Michael Dugger, H. O. Funsten, L. Todor, N. Baillie, D. I. Sober, D. Protopopescu, M. Holtrop, S. Pozdniakov, M. Garçon, Hong Lu, Sbr Ultmann, Dinko Pocanic, Sylvain Bouchigny, P. L. Cole, P. Rossi, S. E. Kuhn, M. Bellis, J. Lachniet, H. Denizli, A. Tkabladze, D. Rowntree, Sapunenko, R. S. Hakobyan, A. V. Skabelin, P. Nadel-Turonski, Tsutomu Mibe, R. C. Minehart, C. A. Meyer, G. V. Fedotov, B. E. Stokes, G. S. Adams, D. P. Weygand, U. Thoma, M. Khandaker, L. C. Smith, B. S. Ishkhanov, D. Doughty, D. Heddle, Gyurjyan, W. Kim, S. Stepanyan, G. Niculescu, M. MacCormick, I. Hleiqawi, G. Rosner, R. Nasseripour, P. Bosted, S. L. Careccia, K. L. Giovanetti, Larry Weinstein, P. Coltharp, M. M. Ito, M. Osipenko, F. Sabatié, M. Guillo, K. Beard, L. Elouadrhiri, A. Deur, W. K. Brooks, R. A. Schumacher, G. V. O'Rielly, E. Golovatch, L. Morand, T. A. Forest, J. Pierce, Avraham Klein, Z. W. Zhao, J. P. Cummings, Hall Crannell, M. Kossov, D. G. Jenkins, G. E. Dodge, P. V. Degtyarenko, S. McAleer, F. X. Girod, I. Niculescu, D. Lawrence, J. W. Price, R. De Masi, Ji Li, E. L. Isupov, Michael L. Williams, S. Boiarinov, Michael Vineyard, B. M. Preedom, Lorenzo Zana, J. P. Santoro, H. S. Jo, and C. Salgado
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Hadron, Carbon-12, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Baryon, Helium-4, 0103 physical sciences, Phenomenological model, Atomic physics, 010306 general physics, Nucleon
Abstract: The (W,Q{sup 2}) dependence of the ratio of inclusive electron scattering cross sections for {sup 15}N/{sup 12}C was determined in the kinematic ranges 0.8
Published: 2008

14. Polarized structure functionσLT'forH1(e→,e'K+)Λin the nucleon resonance region

Author: L. C. Dennis, B. E. Bonner, S. McAleer, F. X. Girod, L. Blaszczyk, H. Avakian, D. Sharov, D. Lawrence, P. Stoler, K. Hicks, K. S. Egiyan, Laird Kramer, D. Doughty, L. C. Smith, E. Munevar, V. Mokeev, K. Mikhailov, Elton Smith, J. Langheinrich, S. S. Stepanyan, S. A. Philips, W. J. Briscoe, E. Pasyuk, B. S. Ishkhanov, D. P. Watts, S. A. Dytman, R. A. Schumacher, P. Eugenio, D. Heddle, H. Egiyan, J. W. Price, M. F. Vineyard, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Nadel-Turonski, Tsutomu Mibe, H. G. Juengst, P. Corvisiero, E. Wolin, M. Taiuti, M. Anghinolfi, M. Kossov, James Mueller, E. De Sanctis, M. R. Niroula, J. P. Ball, M. Battaglieri, Y. Ilieva, P. D. Rubin, Y. G. Sharabian, A.V. Stavinsky, D. S. Carman, Patrick Girard, W. Kim, T. A. Forest, G. Niculescu, J. Lachniet, D. I. Sober, R. J. Feuerbach, Michael Wood, A. I. Ostrovidov, V. Sapunenko, L. Casey, Dinko Pocanic, R. Bradford, K. Lukashin, D. J. Tedeschi, K. Park, C. Hanretty, S. Stepanyan, K. Hafidi, D. G. Crabb, J. Pierce, V. S. Serov, S. E. Kuhn, Avraham Klein, E. Anciant, B. E. Stokes, B. B. Niczyporuk, I. Bedlinskiy, G. Ricco, D. G. Ireland, B. Moreno, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, N. Pivnyuk, Volker D. Burkert, A. S. Biselli, G. Audit, C. E. Hyde-Wright, R. Fatemi, A. V. Vlassov, R. De Vita, Z. W. Zhao, V. Kuznetsov, K. Joo, S. Procureur, Maryam Moteabbed, B. Zhao, D. G. Jenkins, Bernhard Mecking, Z. Krahn, Shifeng Chen, D. Sayre, S. Strauch, P. Collins, D. Protopopescu, I. Niculescu, M. Khandaker, S. Pozdniakov, Sylvain Bouchigny, J. J. Manak, P. Rossi, N. Baillie, S. Anefalos Pereira, A. Fradi, C. Cetina, A. Shafi, P. Dragovitsch, P. Mattione, Friedrich Klein, Kwangsoo Kim, R. A. Miskimen, B. McKinnon, V. P. Kubarovsky, G. Riccardi, J. Salamanca, Sergey Kuleshov, M. Osipenko, R. De Masi, Brian Raue, D. Branford, M. Mirazita, J. M. Laget, J. W C McNabb, S. A. Morrow, C. Djalali, G. S. Mutchler, M. Bektasoglu, S. Niccolai, F. Sabatié, N. Gevorgyan, C. Butuceanu, K. Beard, F. W. Hersman, N. A. Baltzell, J. T. Goetz, K. Livingston, D. S. Dale, N. Markov, O. Pogorelko, P. Coltharp, V. Crede, K. A. Griffioen, R. Dickson, J. Hardie, M. J. Amaryan, Kalvir S. Dhuga, P. Ambrozewicz, Gerard Gilfoyle, M. Nozar, D. Sokhan, M. MacCormick, M. Bellis, I. Hleiqawi, M. M. Ito, S. L. Careccia, J. Kuhn, R. W. Gothe, G. Gavalian, N. Guler, J. R. Calarco, G. A. Peterson, S. Simionatto, J. D. Kellie, S. Taylor, S. Tkachenko, K. Y. Kim, K. L. Giovanetti, B. Asavapibhop, J. P. Santoro, Roy Thompson, Larry Weinstein, S. Barrow, N. Benmouna, M. Ripani, M. Guidal, M. Guillo, L. Cheng, M. D. Mestayer, G. Rosner, R. Nasseripour, Nikolay Shvedunov, J. Hu, E. L. Isupov, L. Elouadrhiri, M. Holtrop, Michael L. Williams, S. Boiarinov, I. I. Strakovsky, B. M. Preedom, A. Deur, Lorenzo Zana, N. Kalantarians, H. Hakobyan, H. S. Jo, Gerald Feldman, Michael Dugger, W. K. Brooks, K. Wang, H. O. Funsten, C. Salgado, B. L. Berman, L. M. Qin, C. Paterson, Thierry Auger, M. Garçcon, J. R. Johnstone, V. Gyurjyan, J. Zhang, H. Bagdasaryan, L. Guo, M. Ungaro, A. Tkabladze, J. Yun, D. Cords, L. El Fassi, A. Yegneswaran, P. L. Cole, Y. Prok, Barry Ritchie, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, D. P. Weygand, A. V. Skabelin, and N. Dashyan
Subjects: Physics, Nuclear and High Energy Physics, Angular range, 010308 nuclear & particles physics, Hydrogen-1, Structure function, Hyperon, Sigma, Resonance, Lambda, 01 natural sciences, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The first measurements of the polarized structure function {sigma}{sub LT{sup '}} for the reaction {sup 1}H(e-vector,e{sup '}K{sup +}){lambda} in the nucleon resonance region are reported. Measurements are included from threshold up to W=2.05 GeV for central values of Q{sup 2} of 0.65 and 1.00 GeV{sup 2}, and nearly the entire kaon center-of-mass angular range. {sigma}{sub LT{sup '}} is the imaginary part of the longitudinal-transverse response and is expected to be sensitive to interferences between competing intermediate s-channel resonances, as well as resonant and nonresonant processes. The results for {sigma}{sub LT{sup '}} are comparable in magnitude to previously reported results from CLAS for {sigma}{sub LT}, the real part of the same response. An intriguing sign change in {sigma}{sub LT{sup '}} is observed in the high Q{sup 2} data at W{approx_equal}1.9 GeV. Comparisons to several existing model predictions are shown.
Published: 2008

15. Light Vector Mesons in the Nuclear Medium

Author: V. Crede, S. McAleer, L. Blaszczyk, J. R. Calarco, B. L. Berman, E. De Sanctis, S. Tkachenko, M. Taiuti, R. A. Schumacher, Michael Wood, A. I. Ostrovidov, G. Asryan, C. I O Gordon, K. Hafidi, K. Park, C. Paterson, J. W. Price, O. P. Dzyubak, R. A. Niyazov, V. S. Serov, L. C. Dennis, D. G. Ireland, B. G. Ritchie, B. E. Stokes, J. Kuhn, M. R. Niroula, Cynthia Marie Hadjidakis, M. J. Amaryan, H. Avakian, M. MacCormick, I. Hleiqawi, Volker D. Burkert, G. S. Adams, S. L. Careccia, A. S. Biselli, S. Stepanyan, D. Sharov, A. V. Vlassov, Philip L. Cole, Larry Weinstein, J. Pierce, Avraham Klein, Chaden Djalali, K.H. Hicks, D. J. Tedeschi, K. Joo, Sylvain Bouchigny, G. S. Mutchler, Michael Dugger, W. Kim, Gerard Gilfoyle, D. Sokhan, H. S. Jo, K. S. Egiyan, J. Hardie, Friedrich Klein, J. P. Cummings, Laird Kramer, K. Livingston, S. A. Dytman, W. K. Brooks, B. Carnahan, S. Niccolai, H. O. Funsten, P. Collins, Ulrich Mosel, Z. W. Zhao, I. Bedlinskiy, H. G. Juengst, G. Niculescu, R. Nasseripour, K. Mikhailov, R. A. Miskimen, B. McKinnon, H. Hakobyan, S. Anefalos Pereira, D. G. Jenkins, P. Coltharp, Hall Crannell, A.V. Stavinsky, P. Eugenio, R. W. Gothe, V. Sapunenko, M. Bektasoglu, C. Salgado, Dinko Pocanic, M. M. Ito, D. Branford, V. Gyurjyan, P. Khetarpal, A. Fradi, M. Holtrop, M. Kossov, J. M. Laget, D. P. Weygand, Y. Ilieva, V. P. Kubarovsky, R. De Vita, L. C. Smith, E. Munevar, G. E. Dodge, B. S. Ishkhanov, P. Nadel-Turonski, H. Bagdasaryan, P. V. Degtyarenko, N. Guler, S. E. Kuhn, Federico Ronchetti, J. J. Melone, K. Moriya, C. Hanretty, I. Niculescu, D. Lawrence, J. D. Kellie, Victor Mokeev, J. R. Johnstone, L. Guo, M. Ungaro, Latifa Elouadrhiri, G. Rosner, J. Lachniet, A. Tkabladze, M. Guidal, A. Yegneswaran, R. C. Minehart, S. Barrow, C. Tur, P. Rossi, J. Langheinrich, S. S. Stepanyan, E. Pasyuk, J. Zhang, C. A. Meyer, S. Mehrabyan, F. X. Girod, Baile Zhang, G. V. Fedotov, G. Gavalian, R. S. Hakobyan, R. Dickson, M. Ripani, L. El Fassi, D. Doughty, Z. Krahn, N. Benmouna, G. Riccardi, B. A. Raue, M. Osipenko, C. Butuceanu, Tsutomu Mibe, L. Cheng, Shifeng Chen, N. Baillie, Daniel S. Carman, F. Sabatié, Nikolay Shvedunov, K. L. Giovanetti, S. V. Kuleshov, D. Protopopescu, G. Ricco, S. Pozdniakov, M. Garçon, E. Wolin, C. E. Hyde-Wright, O. Pogorelko, J. Ball, N. Kalantarians, M. Khandaker, D. G. Crabb, M. Nozar, B. Zhao, H. Denizli, H. Y. Lu, J. T. Goetz, F. W. Hersman, M. Mirazita, Elton Smith, N. Dashyan, James Mueller, Alexei V. Klimenko, Y. Prok, I. I. Strakovsky, Y. G. Sharabian, P. Muehlich, A. Deur, Ji Li, M. D. Mestayer, R. J. Feuerbach, E. L. Isupov, Michael L. Williams, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, S. Boiarinov, B. M. Preedom, Lorenzo Zana, J. P. Santoro, M. Battaglieri, D. P. Watts, H. Egiyan, Gerald Feldman, N. A. Baltzell, N. Markov, R. Bradford, K. A. Griffioen, N. Hassall, M. Bellis, J. Salamanca, P. Mattione, J. W C McNabb, M. Anghinolfi, L. Casey, B. B. Niczyporuk, Michael Vineyard, N. Pivnyuk, W. J. Briscoe, L. Todor, S. A. Morrow, S. Strauch, P. Ambrozewicz, P. Stoler, D. I. Sober, Thomas Jefferson National Accelerator Facility (Jefferson Lab), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, Rho meson, Meson, Nuclear Theory, FOS: Physical sciences, light vector mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, chiral symmetry, Spectral line, Nuclear physics, ENHANCEMENT, CLAS, 0103 physical sciences, 11.30.Rd, 14.40.Cs, 24.85.+p, QCD SUM-RULES, Invariant mass, RHO-MESON, Nuclear Experiment (nucl-ex), 010306 general physics, in-medium modifications, Nuclear Experiment, Physics, AU COLLISIONS, QCD sum rules, CEBAF, 010308 nuclear & particles physics, QCD SUM-RULES, RHO-MESON, SPECTRAL-FUNCTION, AU COLLISIONS, OMEGA-MESONS, MATTER, CLAS, ENHANCEMENT, SYSTEM, CEBAF, Nuclear matter, SPECTRAL-FUNCTION, Deuterium, Mass spectrum, High Energy Physics::Experiment, MATTER, SYSTEM, OMEGA-MESONS
Abstract: The light vector mesons ($\rho$, $\omega$, and $\phi$) were produced in deuterium, carbon, titanium, and iron targets in a search for possible in-medium modifications to the properties of the $\rho$ meson at normal nuclear densities and zero temperature. The vector mesons were detected with the CEBAF Large Acceptance Spectrometer (CLAS) via their decays to $e^{+}e^{-}$. The rare leptonic decay was chosen to reduce final-state interactions. A combinatorial background was subtracted from the invariant mass spectra using a well-established event-mixing technique. The $\rho$ meson mass spectrum was extracted after the $\omega$ and $\phi$ signals were removed in a nearly model-independent way. Comparisons were made between the $\rho$ mass spectra from the heavy targets ($A > 2$) with the mass spectrum extracted from the deuterium target. With respect to the $\rho$-meson mass, we obtain a small shift compatible with zero. Also, we measure widths consistent with standard nuclear many-body effects such as collisional broadening and Fermi motion., Comment: 15 pages, 18 figures, 3 tables
Published: 2008

16. Bayesian analysis of pentaquark signals from CLAS data

Author: W. Kim, P. Coltharp, L. C. Smith, E. Munevar, G. Niculescu, B. S. Ishkhanov, M. R. Niroula, E. Wolin, D. P. Watts, A. V. Vlassov, Lorenzo Zana, N. Markov, Gerard Gilfoyle, H. Avakian, D. Sharov, R. De Vita, A. Fradi, F. X. Girod, L. Blaszczyk, D. Sokhan, H. Hakobyan, H. S. Jo, Gerald Feldman, D. Doughty, Chaden Djalali, J. Kuhn, Michael Dugger, B. Zhao, W. J. Briscoe, G. E. Dodge, H. Y. Lu, S. Anefalos Pereira, Federico Ronchetti, M. Kossov, H. O. Funsten, J. P. Ball, Y. Prok, E. Pasyuk, B. E. Stokes, J. P. Santoro, D. S. Carman, C. Salgado, B. L. Berman, C. E. Hyde-Wright, Atilla Gonenc, P. V. Degtyarenko, Sylvain Bouchigny, K. Joo, Y. Ilieva, N. Hassall, M. Bellis, G. Ricco, J. W. Price, E. De Sanctis, P. Rossi, Laird Kramer, V. Kuznetsov, J. Lachniet, D. I. Sober, Z. Krahn, D. G. Crabb, F. W. Hersman, Sergey Kuleshov, Friedrich Klein, Brian Raue, N. Dashyan, Michael Wood, M. Nozar, M. Ripani, M. D. Mestayer, P. Eugenio, N. Baillie, K. Hafidi, M. Taiuti, Z. W. Zhao, C. Paterson, I. Niculescu, E. L. Isupov, V. Crede, R. A. Miskimen, B. McKinnon, D. G. Jenkins, Michael L. Williams, J. Langheinrich, A. I. Ostrovidov, D. Lawrence, M. Osipenko, V. S. Serov, N. A. Baltzell, S. S. Stepanyan, D. G. Ireland, S. Boiarinov, D. Branford, J. D. Kellie, J. R. Calarco, K. A. Griffioen, Volker D. Burkert, A. S. Biselli, P. Collins, M. Mirazita, V. Batourine, M. Khandaker, G. Rosner, R. Nasseripour, G. Gavalian, J. M. Laget, J. Donnelly, S. Tkachenko, N. Gevorgyan, R. De Masi, K. Park, F. Sabatié, G. Asryan, N. Benmouna, S. Procureur, Maryam Moteabbed, Bernhard Mecking, Michael Vineyard, B. Moreno, R. A. Schumacher, R. W. Gothe, L. Cheng, O. P. Dzyubak, C. Butuceanu, Nikolay Shvedunov, S. Strauch, M. Guidal, M. MacCormick, D. Protopopescu, I. Hleiqawi, M. Battaglieri, S. L. Careccia, G. S. Mutchler, S. Pozdniakov, M. Garçon, R. Bradford, K. L. Giovanetti, N. Kalantarians, Larry Weinstein, K. Livingston, M. Holtrop, S. Niccolai, R. Dickson, N. Guler, S. Stepanyan, H. G. Juengst, J. Pierce, Avraham Klein, A.V. Stavinsky, K. S. Egiyan, D. J. Tedeschi, V. Gyurjyan, I. Bedlinskiy, K. Mikhailov, J. Zhang, H. Bagdasaryan, L. Guo, M. Ungaro, P. Stoler, R. A. Niyazov, A. Yegneswaran, P. Nadel-Turonski, Tsutomu Mibe, C. Hanretty, Barry Ritchie, Victor Mokeev, J. R. Johnstone, P. L. Cole, A. Tkabladze, Latifa Elouadrhiri, L. El Fassi, Kei Moriya, C. A. Meyer, V. Sapunenko, G. V. Fedotov, S. A. Morrow, P. Ambrozewicz, D. P. Weygand, J. Salamanca, L. Casey, W. Gohn, C. Tur, B. B. Niczyporuk, N. Pivnyuk, A. Deur, W. K. Brooks, M. Anghinolfi, Y. G. Sharabian, Shifeng Chen, P. Mattione, J. T. Goetz, V. P. Kubarovsky, O. Pogorelko, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Quark, Particle physics, Bayesian probability, FOS: Physical sciences, General Physics and Astronomy, Physics and Astronomy(all), 01 natural sciences, Bayesian, Particle identification, High Energy Physics - Phenomenology (hep-ph), CLAS, 0103 physical sciences, Feature (machine learning), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, pentaquark, Physics, 010308 nuclear & particles physics, Hyperon, Probability and statistics, Fermion, 13.60.Rj, 12.39.Mk, 14.20.Jn, 14.80.-j, 02.50.-r, 02.70.Uu, Pentaquark, High Energy Physics - Phenomenology, Physics - Data Analysis, Statistics and Probability, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Data Analysis, Statistics and Probability (physics.data-an)
Abstract: We examine the results of two measurements by the CLAS collaboration, one of which claimed evidence for a $\Theta^{+}$ pentaquark, whilst the other found no such evidence. The unique feature of these two experiments was that they were performed with the same experimental setup. Using a Bayesian analysis we find that the results of the two experiments are in fact compatible with each other, but that the first measurement did not contain sufficient information to determine unambiguously the existence of a $\Theta^{+}$. Further, we suggest a means by which the existence of a new candidate particle can be tested in a rigorous manner., Comment: 5 pages, 3 figures
Published: 2008

17. Measurement of Deeply Virtual Compton Scattering Beam-Spin Asymmetries

Author: G. Niculescu, Gerard Gilfoyle, K. Livingston, L. Blaszczyk, S. Tkachenko, I. I. Strakovsky, A. Deur, D. Sokhan, J. Donnelly, G. Asryan, O. P. Dzyubak, A. V. Vlassov, M. Taiuti, K. S. Egiyan, K. Mikhailov, T. Lee, Atilla Gonenc, G. E. Dodge, R. W. Gothe, J. W. Price, M. Guidal, P. Rossi, R. Dickson, V. Crede, D. Doughty, P. V. Degtyarenko, Daniel S. Carman, Alexei V. Klimenko, J. R. Calarco, M. Mazouz, R. Miskimen, J. Salamanca, Lorenzo Zana, J. Kuhn, M. Ripani, Philip L. Cole, J. P. Santoro, Y. Prok, Z. Krahn, Hovanes Egiyan, B. A. Raue, D. P. Watts, Barry Ritchie, O. Pogorelko, M. Khandaker, V. Batourine, C. Butuceanu, G. Ricco, I. Niculescu, R. A. Niyazov, H. Y. Lu, Friedrich Klein, D. Lawrence, E. Wolin, Z. W. Zhao, N. Markov, Elton Smith, Gerald Feldman, B. McKinnon, J. Ball, S. A. Morrow, N. Baillie, R. De Masi, J. P. Ball, M. Nozar, P. Eugenio, B. Zhao, D. Protopopescu, C. E. Hyde, S. Pozdniakov, M. Garçon, D. Branford, P. Stoler, Michael Wood, R. A. Schumacher, E. De Sanctis, M. J. Amaryan, J. M. Laget, K. Hafidi, P. Ambrozewicz, M. MacCormick, Y. Ilieva, B. Michel, V. S. Serov, D. G. Crabb, J. Langheinrich, E. Voutier, S. S. Stepanyan, E. Pasyuk, R. De Vita, I. Hleiqawi, M. Osipenko, M. Kossov, S. L. Careccia, B. E. Stokes, N. Guler, Sylvain Bouchigny, S. Bültmann, Tsutomu Mibe, M. Anghinolfi, M. R. Niroula, N. Dashyan, F. W. Hersman, L. C. Smith, E. Munevar, S. Stepanyan, L. Casey, K.H. Hicks, K. Joo, Y. G. Sharabian, Larry Weinstein, J. Pierce, Avraham Klein, Latifa Elouadrhiri, D. J. Tedeschi, B. L. Berman, B. S. Ishkhanov, I. Bedlinskiy, N. A. Baltzell, C. A. Meyer, V. P. Kubarovsky, G. V. Fedotov, Laird Kramer, P. Collins, David Jenkins, J. D. Kellie, B. B. Niczyporuk, K. L. Giovanetti, S. V. Kuleshov, C. Hanretty, M. Holtrop, C. Paterson, V. Sapunenko, Michael Vineyard, H. Avakian, D. Sharov, N. Pivnyuk, Dinko Pocanic, D. P. Weygand, W. J. Briscoe, H. S. Jo, K. A. Griffioen, A. I. Ostrovidov, K. Park, D. G. Ireland, S. E. Kuhn, M. D. Mestayer, Volker D. Burkert, A. S. Biselli, S. Niccolai, E. L. Isupov, Michael L. Williams, W. K. Brooks, S. Boiarinov, C. Tur, G. Rosner, P. Coltharp, Victor Mokeev, J. R. Johnstone, Shifeng Chen, J. Lachniet, M. M. Ito, L. Guo, P. Mattione, A. Tkabladze, J. T. Goetz, V. Gyurjyan, M. Mirazita, M. Ungaro, J. Zhang, F. X. Girod, S. Strauch, L. El Fassi, R. Nasseripour, P. Nadel-Turonski, D. I. Sober, G. S. Mutchler, H. Bagdasaryan, M. Bellis, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, G. Gavalian, M. Battaglieri, N. Benmouna, R. Bradford, Chaden Djalali, Michael Dugger, H. O. Funsten, K. Moriya, Carlos A. Salgado, L. Cheng, F. Sabatié, Nikolay Shvedunov, A. Yegneswaran, N. Kalantarians, H. G. Juengst, H. Hakobyan, S. Anefalos Pereira, A.V. Stavinsky, W. Kim, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quark, Particle physics, Photon, Proton, media_common.quotation_subject, HERA, General Physics and Astronomy, Parton, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PARTON DISTRIBUTIONS, NUCLEON, HERA, NUCLEON, 010306 general physics, Nuclear Experiment, media_common, Physics, 010308 nuclear & particles physics, Compton scattering, 12.40.Vv,13.40.Gp,13.60.Fz,13.60.Hb,13.60.-r,14.20.Dh,24.85.+p, PARTON DISTRIBUTIONS, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, Nucleon
Abstract: 1 tex file (6 pages), 4 (eps) figures; The beam spin asymmetries in the hard exclusive electroproduction of photons on the proton (ep -> epg) were measured over a wide kinematic range and with high statistical accuracy. These asymmetries result from the interference of the Bethe-Heitler process and of deeply virtual Compton scattering. Over the whole kinematic range (x_B from 0.11 to 0.58, Q^2 from 1 to 4.8 GeV^2, -t from 0.09 to 1.8 GeV^2), the azimuthal dependence of the asymmetries is compatible with expectations from leading-twist dominance, A = a*sin(phi)/[1+c*cos(phi)]. This extensive set of data can thus be used to constrain significantly the generalized parton distributions of the nucleon in the valence quark sector.
Published: 2008

18. New physics possibilities at electron accelerators

Author: Bernhard Mecking
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Applied physics, Physics beyond the Standard Model, Electron
Published: 1990

19. π0photoproduction on the proton for photon energies from 0.675 to 2.875 GeV

Author: B. M. Preedom, J. P. Ball, D. S. Carman, L. C. Dennis, B. E. Bonner, R. A. Schumacher, H. Avakian, J. Kuhn, J. P. Santoro, Roy Thompson, B. Carnahan, D. G. Crabb, P. Eugenio, M. Taiuti, P. Collins, R. A. Niyazov, F. Sabatié, S. Bültmann, T. A. Forest, A. I. Ostrovidov, J. Langheinrich, A. C S Lima, W. J. Briscoe, V. Gyurjyan, S. S. Stepanyan, P. Stoler, J. Slamanca, S. A. Philips, S. Stepanyan, H. S. Jo, Gerald Feldman, E. Pasyuk, Valeria Muccifora, J. Pierce, Avraham Klein, D. Doughty, S. A. Dytman, D. G. Ireland, K. Wang, K. Hicks, J. Zhang, H. Bagdasaryan, D. Heddle, L. Elouadrhiri, R. J. Feuerbach, I. I. Strakovsky, Volker D. Burkert, B. B. Niczyporuk, A. S. Biselli, Gerard Gilfoyle, Marco A. Huertas, H. G. Juengst, L. Zana, G. E. Dodge, P. Coltharp, A. Deur, B. E. Stokes, W. K. Brooks, N. Pivnyuk, P. V. Degtyarenko, G. S. Adams, W. Kim, G. Gavalian, A.V. Stavinsky, J. Shaw, G. Niculescu, J. Napolitano, B. L. Berman, J. Donnelly, G. Asryan, O. P. Dzyubak, S. Tkachenko, Federico Ronchetti, Kwangsoo Kim, G. Riccardi, R. Fatemi, C. Butuceanu, Laird Kramer, M. M. Ito, L. M. Qin, F. W. Hersman, M. Kossov, A. V. Vlassov, Sylvain Bouchigny, P. Rossi, E. Anciant, G. V. O'Rielly, M. D. Mestayer, K. Joo, I. Niculescu, D. Lawrence, N. Benmouna, P. Corvisiero, M. Ripani, Carlos A. Salgado, G. Ricco, Michael L. Williams, Victor Mokeev, T. Lee, D. J. Tedeschi, M. Amarian, L. Guo, P. Nadel-Turonski, Tsutomu Mibe, Z. Krahn, Y. Ilieva, M. Spraker, M. Ungaro, Michael Wood, V. S. Serov, M. Guidal, Susan Taylor, S. Strauch, M. Khandaker, N. Baillie, C. Paterson, M. Klusman, S. Boiarinov, J. P. Cummings, R. De Vita, R. A. Miskimen, K. Park, K. S. Egiyan, B. McKinnon, D. G. Jenkins, H. Egiyan, L. C. Maximon, K. Mikhailov, A. Coleman, I. Hleiqawi, H. R. Weller, J. R. Calarco, M. Guillo, I. Bedlinskiy, S. L. Careccia, S. Simionatto, M. Holtrop, S. McAleer, Friedrich Klein, D. Branford, F. X. Girod, Brian Raue, N. Kalantarians, Hall Crannell, J. J. Manak, M. Osipenko, M. Mirazita, K. L. Giovanetti, B. Asavapibhop, Cynthia Marie Hadjidakis, J. M. Laget, A. Tkabladze, J. Yun, D. Cords, Larry Weinstein, J. W C McNabb, D. Rowntree, K. Beard, L. C. Smith, A. Yegneswaran, Michael Dugger, H. O. Funsten, Michael Vineyard, V. P. Kubarovsky, Nicola Bianchi, R. W. Gothe, B. S. Ishkhanov, Kalvir S. Dhuga, C. Marchand, V. Kuznetsov, S. A. Morrow, C. Djalali, L. Todor, A. Empl, R. S. Hakobyan, O. Pogorelko, K. Y. Kim, G. Rosner, R. Nasseripour, E. De Sanctis, D. Protopopescu, J. W. Price, M. R. Niroula, S. Pozdniakov, M. Garçon, G. Audit, C. E. Hyde-Wright, J. Lachniet, D. I. Sober, A. Shafi, P. Ambrozewicz, P. Dragovitsch, M. Bektasoglu, M. Nozar, K. Livingston, S. Niccolai, P. L. Cole, R. Dickson, J. Hardie, N. Guler, S. Barrow, M. Battaglieri, N. A. Baltzell, K. A. Griffioen, J. D. Kellie, Ron L. Workman, R. Bradford, K. Lukashin, G. S. Mutchler, M. Bellis, J. Hu, Alexei V. Klimenko, R. A. Arndt, Barry Ritchie, Bernhard Mecking, K. V. Dharmawardane, R. C. Minehart, Kei Moriya, C. A. Meyer, G. V. Fedotov, Y. Prok, D. P. Weygand, H. Denizli, A. V. Skabelin, Shifeng Chen, J. T. Goetz, V. Sapunenko, Dinko Pocanic, S. E. Kuhn, C. Tur, Elton Smith, J. R. Ficenec, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, and E. Wolin
Subjects: Physics, Normalization (statistics), Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, Proton, 010308 nuclear & particles physics, Forward scatter, Scattering, 01 natural sciences, Particle identification, Nuclear physics, 0103 physical sciences, Photon beam, Nuclear Experiment, 010306 general physics
Abstract: Differential cross sections for the reaction $\gamma p \to p \pi^0$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged photon beam with energies from 0.675 to 2.875 GeV. The results reported here possess greater accuracy in the absolute normalization than previous measurements. They disagree with recent CB-ELSA measurements for the process at forward scattering angles. Agreement with the SAID and MAID fits is found below 1 GeV. The present set of cross sections has been incorporated into the SAID database, and exploratory fits have been extended to 3 GeV. Resonance couplings have been extracted and compared to previous determinations.
Published: 2007

20. Q2dependence of theS11(1535)photocoupling and evidence for aP-wave resonance in η electroproduction

Author: S. A. Morrow, Laird Kramer, P. Dragovitsch, P. Stoler, Barry Ritchie, J. Hardie, S. O. Nelson, K. Hicks, H. G. Juengst, M. L. Leber, Federico Ronchetti, K. Livingston, A.V. Stavinsky, D. J. Tedeschi, J. Kuhn, N. A. Baltzell, R. C. Minehart, C. A. Meyer, G. V. Fedotov, R. Dickson, L. Elouadrhiri, H. Denizli, J. P. Santoro, Roy Thompson, D. P. Weygand, I. Bedlinskiy, K. A. Griffioen, G. Ricco, N. Markov, J. Langheinrich, S. S. Stepanyan, N. Dashyan, S. A. Philips, I. I. Strakovsky, N. Guler, M. Bellis, G. A. Peterson, K. S. Egiyan, Nikolay Shvedunov, A. Deur, V. Frolov, M. J. Amaryan, K. Mikhailov, Shifeng Chen, R. J. Feuerbach, A. I. Ostrovidov, P. Eugenio, R. Fatemi, B. B. Niczyporuk, S. Barrow, W. K. Brooks, M. Taiuti, V. Batourine, I. Hleiqawi, Friedrich Klein, Y. Ilieva, C. Cetina, A. V. Vlassov, S. L. Careccia, N. Kalantarians, J. Hu, J. D. Kellie, J. P. Cummings, S. Simionatto, C. E. Hyde-Wright, Brian Raue, N. Pivnyuk, J. Napolitano, Michael Vineyard, L. Farhi, D. Rowntree, Sergey Kuleshov, N. Baillie, J. T. Goetz, E. Polli, M. Bektasoglu, M. Nozar, V. Gyurjyan, G. V. O'Rielly, P. Collins, Maryam Moteabbed, K. L. Giovanetti, B. Asavapibhop, M. Kossov, M. MacCormick, Valeria Muccifora, Bernhard Mecking, V. Sapunenko, Dinko Pocanic, R. De Vita, J. Zhang, M. Guidal, Z. W. Zhao, G. Gavalian, S. Tkachenko, R. A. Schumacher, Susan Taylor, N. Benmouna, P. L. Cole, M. Spraker, Larry Weinstein, D. Doughty, G. Rosner, L. C. Smith, S. J. Gaff, H. Bagdasaryan, R. Nasseripour, M. Holtrop, D. G. Jenkins, C. Djalali, M. D. Mestayer, E. L. Isupov, M. Ripani, L. Guo, S. Strauch, Gerard Gilfoyle, K. Sabourov, D. Heddle, Nicola Bianchi, D. P. Watts, H. Egiyan, S. Bültmann, M. Ungaro, Michael L. Williams, B. S. Ishkhanov, Sylvain Bouchigny, S. E. Kuhn, T. A. Forest, D. Sokhan, S. Stepanyan, P. Nadel-Turonski, B. E. Stokes, J. W. Price, J. Pierce, Avraham Klein, G. S. Adams, Tsutomu Mibe, G. E. Dodge, J. J. Manak, S. Boiarinov, Michael Dugger, S. McAleer, B. M. Preedom, H. Y. Lu, P. Rossi, H. O. Funsten, F. X. Girod, P. V. Degtyarenko, D. Protopopescu, R. A. Miskimen, B. McKinnon, J. H. Kelley, K. Joo, G. S. Mutchler, S. Pozdniakov, M. Garçon, L. M. Qin, J. Yun, D. Cords, C. Tur, Lorenzo Zana, D. G. Ireland, A. Shafi, A. Yegneswaran, I. Niculescu, M. Battaglieri, V. Crede, D. Lawrence, D. Branford, P. Ambrozewicz, H. Hakobyan, Kwangsoo Kim, G. Riccardi, Gerald Feldman, K. Moriya, U. Thoma, J. R. Calarco, A. Tkabladze, M. Mirazita, J. M. Laget, C. Paterson, Elton Smith, K. Wang, C. Salgado, Atilla Gonenc, M. R. Niroula, M. Klusman, R. Bradford, K. Lukashin, C. Butuceanu, M. Guillo, E. De Sanctis, M. Khandaker, M. Anghinolfi, E. Wolin, H. S. Jo, R. S. Hakobyan, James Mueller, L. El Fassi, P. D. Rubin, J. P. Ball, Y. Prok, Y. G. Sharabian, D. S. Carman, J. Lachniet, D. I. Sober, S. Niccolai, D. G. Crabb, J. Salamanca, J. W C McNabb, A. Coleman, H. R. Weller, Volker D. Burkert, A. S. Biselli, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, J. Miles, P. Coltharp, M. Osipenko, F. Sabatié, M. M. Ito, K. Beard, R. W. Gothe, Kalvir S. Dhuga, K. Y. Kim, W. Kim, A. V. Skabelin, G. Niculescu, B. Zhao, R. D. Levine, V. Mokeev, F. W. Hersman, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, Patrick Girard, J. Shaw, Michael Wood, K. Hafidi, V. S. Serov, K. Park, V. P. Kubarovsky, A. Empl, and O. Pogorelko
Subjects: Baryon, Scattering cross-section, Physics, Nuclear and High Energy Physics, Cross section.transverse, Particle physics, Amplitude, Photon, Angular distribution, Momentum transfer, Resonance, High Energy Physics::Experiment
Abstract: New cross sections for the reaction $\mathit{ep}\ensuremath{\rightarrow}{e}^{'}\ensuremath{\eta}p$ are reported for total center-of-mass energy $W=1.5\text{\ensuremath{-}}2.3$ GeV and invariant squared momentum transfer ${Q}^{2}=0.13\text{\ensuremath{-}}3.3$ GeV${}^{2}$. This large kinematic range allows the extraction of new information about response functions, photocouplings, and $\ensuremath{\eta}N$ coupling strengths of baryon resonances. A sharp structure is seen at $W~1.7$ GeV. The shape of the differential cross section is indicative of the presence of a $P$-wave resonance that persists to high ${Q}^{2}$. Improved values are derived for the photocoupling amplitude for the ${S}_{11}$(1535) resonance. The new data greatly expand the ${Q}^{2}$ range covered, and an interpretation of all data with a consistent parametrization is provided.
Published: 2007

21. 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

22. Cross sections for theγp→K*0Σ+reaction atEγ=1.7–3.0GeV

Author: S. McAleer, H. G. Juengst, F. X. Girod, J. Kuhn, A.V. Stavinsky, A. V. Vlassov, R. W. Gothe, Roy Thompson, Atilla Gonenc, R. De Vita, J. W. Price, D. J. Tedeschi, U. Thoma, S. A. Morrow, B. E. Stokes, P. Coltharp, Michael Vineyard, V. Sapunenko, G. Ricco, Latifa Elouadrhiri, C. Djalali, M. M. Ito, J. P. Cummings, I. Bedlinskiy, M. Kossov, Hall Crannell, R. C. Minehart, S. E. Kuhn, C. A. Meyer, K. Park, A. Tkabladze, Maryam Moteabbed, L. C. Smith, E. Munevar, P. Ambrozewicz, Bernhard Mecking, B. M. Preedom, G. V. Fedotov, Friedrich Klein, C. Tur, M. Osipenko, B. S. Ishkhanov, H. Egiyan, B. Zhao, Z. W. Zhao, P. Eugenio, Lorenzo Zana, J. P. Santoro, M. Taiuti, Brian Raue, G. E. Dodge, H. Y. Lu, V. Gyurjyan, E. De Sanctis, K. Beard, H. S. Jo, M. R. Niroula, V. P. Kubarovsky, D. P. Weygand, M. Battaglieri, R. S. Hakobyan, J. Zhang, P. Stoler, G. Gavalian, V. Crede, S. Tkachenko, D. G. Jenkins, Elton Smith, N. Benmouna, M. Ripani, Gerald Feldman, K. Wang, P. V. Degtyarenko, Daniel S. Carman, C. Salgado, H. Bagdasaryan, R. Bradford, J. Lachniet, D. I. Sober, J. R. Calarco, O. Pogorelko, M. Anghinolfi, P. Collins, Y. G. Sharabian, L. Guo, M. Ungaro, B. L. Berman, P. Nadel-Turonski, Tsutomu Mibe, J. W C McNabb, Federico Ronchetti, Michael Dugger, I. Niculescu, Alexei V. Klimenko, Ji Li, D. Lawrence, K. Hicks, G. Rosner, Barry Ritchie, R. Nasseripour, S. Niccolai, F. W. Hersman, K. S. Egiyan, C. E. Hyde-Wright, Kwangsoo Kim, S. Strauch, M. D. Mestayer, K. Joo, G. Riccardi, K. Moriya, R. A. Niyazov, Shifeng Chen, B. B. Niczyporuk, R. De Masi, R. A. Schumacher, K. Mikhailov, A. Yegneswaran, M. Bellis, Michael L. Williams, C. Paterson, M. Amarian, N. Pivnyuk, J. Hardie, C. Butuceanu, S. Boiarinov, Sergey Kuleshov, M. Nozar, Sylvain Bouchigny, N. Kalantarians, J. T. Goetz, S. Bültmann, P. Rossi, R. G. Fersch, J. Donnelly, G. Asryan, O. P. Dzyubak, P. L. Cole, S. Whisnant, S. Stepanyan, I. I. Strakovsky, M. Guidal, J. Pierce, Avraham Klein, G. S. Mutchler, A. Deur, W. K. Brooks, M. Holtrop, V. Batourine, B. Carnahan, F. Sabatié, E. Wolin, J. Langheinrich, S. S. Stepanyan, J. P. Ball, Y. Prok, N. A. Baltzell, K. A. Griffioen, D. G. Crabb, J. D. Kellie, V. Mokeev, K. Lukashin, W. Kim, G. Niculescu, Michael Wood, V. S. Serov, L. C. Dennis, H. Avakian, M. MacCormick, I. Hleiqawi, Laird Kramer, W. J. Briscoe, E. Pasyuk, S. A. Dytman, S. L. Careccia, Gerard Gilfoyle, K. L. Giovanetti, S. Taylor, Y. Ilieva, Larry Weinstein, K. Livingston, R. Dickson, N. Guler, L. Todor, D. Protopopescu, A. I. Ostrovidov, M. Khandaker, S. Pozdniakov, M. Garçon, Z. Krahn, N. Baillie, D. G. Ireland, D. Doughty, R. A. Miskimen, B. McKinnon, Volker D. Burkert, A. S. Biselli, D. Heddle, D. Branford, M. Mirazita, J. M. Laget, and R. J. Feuerbach
Subjects: Quark, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Photon, Meson, 010308 nuclear & particles physics, Scalar (mathematics), Dalitz plot, Photon energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Tensor, Nuclear Experiment, 010306 general physics
Abstract: Differential cross sections for the reaction $$\gamma p \to K^{*0} \Sigma^+$$ are presented at nine bins in photon energy in the range from 1.7 to 3.0 GeV. The \kstar was detected by its decay products, $$K^+\pi^-$$, in the CLAS detector at Jefferson Lab. These data are the first \kstar photoproduction cross sections ever published over a broad range of angles. Comparison with a theoretical model based on the vector and tensor $K^*$-quark couplings shows good agreement with the data in general, after adjusting the model's two parameters in a fit to our data. Disagreement between the data at forward angles and the global angle-energy fit to the model suggests that the role of scalar $$\kappa$$ meson exchange in $t$-channel diagrams should be investigated.
Published: 2007

23. Separated structure functions for the exclusive electroproduction ofK+ΛandK+Σ0final states

Author: Y. Ilieva, L. C. Dennis, B. E. Bonner, J. Kuhn, J. P. Santoro, Elton Smith, D. P. Watts, Roy Thompson, Nicola Bianchi, R. W. Gothe, H. Avakian, H. Egiyan, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, D. G. Ireland, P. Eugenio, V. Crede, M. Taiuti, P. Collins, Michael Dugger, C. A. Meyer, H. O. Funsten, K. Livingston, P. L. Cole, M. Anghinolfi, G. V. Fedotov, R. A. Miskimen, B. McKinnon, K. Y. Kim, N. Markov, A. Tkabladze, J. R. Calarco, E. Wolin, R. Dickson, I. I. Strakovsky, James Mueller, D. Rowntree, D. Branford, E. De Sanctis, A. Deur, K. S. Egiyan, W. J. Briscoe, P. D. Rubin, J. P. Ball, B. Zhao, E. Pasyuk, M. Mirazita, J. M. Laget, N. Guler, J. Lachniet, D. I. Sober, A. I. Ostrovidov, D. Doughty, W. K. Brooks, Y. G. Sharabian, D. P. Weygand, K. Mikhailov, L. El Fassi, D. G. Crabb, V. Batourine, S. A. Dytman, Volker D. Burkert, R. Fatemi, G. V. O'Rielly, D. Heddle, Daniel S. Carman, A. S. Biselli, S. Barrow, A. V. Vlassov, G. Gavalian, F. W. Hersman, P. Dragovitsch, Z. W. Zhao, L. Farhi, S. Tkachenko, V. Sapunenko, D. Sayre, N. Benmouna, M. Ripani, P. Nadel-Turonski, Dinko Pocanic, D. G. Jenkins, D. Protopopescu, Kwangsoo Kim, G. Riccardi, M. Amarian, D. Lawrence, Nikolay Shvedunov, J. P. Cummings, C. E. Hyde-Wright, A. V. Skabelin, K. Park, S. Pozdniakov, M. Garçon, C. Butuceanu, Tsutomu Mibe, P. Stoler, R. De Vita, Laird Kramer, N. Baillie, A. Shafi, S. McAleer, M. Osipenko, F. Sabatié, N. Kalantarians, S. E. Kuhn, F. X. Girod, K. Beard, M. Kossov, P. Coltharp, S. Niccolai, K. Hicks, Valeria Muccifora, B. L. Berman, Sylvain Bouchigny, C. Tur, Y. Prok, Barry Ritchie, Kalvir S. Dhuga, L. M. Qin, Gerard Gilfoyle, R. J. Feuerbach, M. M. Ito, Sergey Kuleshov, M. Guillo, M. Bektasoglu, P. Rossi, M. Nozar, V. P. Kubarovsky, J. Donnelly, G. Asryan, V. Frolov, D. Sokhan, O. P. Dzyubak, R. A. Niyazov, C. Paterson, Atilla Gonenc, J. W. Price, M. Klusman, W. Kim, J. Hardie, M. MacCormick, I. Hleiqawi, L. C. Smith, Shifeng Chen, B. S. Ishkhanov, S. L. Careccia, P. Corvisiero, S. Simionatto, G. Niculescu, K. L. Giovanetti, B. Asavapibhop, S. Taylor, Larry Weinstein, M. R. Niroula, M. Khandaker, H. G. Juengst, M. Guidal, M. Bellis, J. Salamanca, V. Mokeev, M. Holtrop, A.V. Stavinsky, C. Cetina, J. T. Goetz, Jian Zhang, E. Polli, Michael Vineyard, J. Langheinrich, S. S. Stepanyan, S. A. Philips, D. J. Tedeschi, I. Bedlinskiy, J. W C McNabb, J. Hu, M. D. Mestayer, E. L. Isupov, B. B. Niczyporuk, S. Boiarinov, Maryam Moteabbed, N. Pivnyuk, B. M. Preedom, Bernhard Mecking, Lorenzo Zana, J. Napolitano, H. Hakobyan, H. S. Jo, Gerald Feldman, K. Wang, C. Salgado, S. A. Morrow, C. Djalali, M. Battaglieri, R. Bradford, P. Ambrozewicz, K. Lukashin, N. A. Baltzell, K. A. Griffioen, J. J. Manak, J. D. Kellie, S. Strauch, G. S. Mutchler, Mathew Williams, V. Gyurjyan, H. Bagdasaryan, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, B. E. Stokes, G. Ricco, G. Rosner, R. Nasseripour, A. Empl, O. Pogorelko, Patrick Girard, Michael Wood, K. Hafidi, V. S. Serov, Friedrich Klein, Brian Raue, Federico Ronchetti, G. E. Dodge, H. Y. Lu, P. V. Degtyarenko, I. Niculescu, R. De Masi, R. A. Schumacher, S. Bültmann, T. A. Forest, S. Stepanyan, J. Pierce, Avraham Klein, and N. Dashyan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Momentum transfer, Hyperon, Sigma, Strangeness, Lambda, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract: We report measurements of the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states from a proton target using the Continuous Electron Beam Accelerator Facility (CEBAF) large-acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions {sigma}{sub T},{sigma}{sub L},{sigma}{sub TT}, and {sigma}{sub LT} were extracted from the {phi}- and {epsilon}-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first {sigma}{sub L}/{sigma}{sub T} separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from 0.5{
Published: 2007

24. First measurement of beam-recoil observablesCxandCzin hyperon photoproduction

Author: V. Gyurjyan, L. C. Dennis, B. E. Bonner, H. Avakian, Maryam Moteabbed, Bernhard Mecking, J. Zhang, K. V. Dharmawardane, H. Bagdasaryan, K. Park, F. Sabatiã, V. P. Kubarovsky, A. Empl, O. Pogorelko, S. A. Morrow, K. Lukashin, W. J. Briscoe, E. Pasyuk, L. C. Smith, V. Sapunenko, Dinko Pocanic, S. A. Dytman, B. S. Ishkhanov, Barry Ritchie, J. Kuhn, Hall Crannell, Marco Ripani, S. E. Kuhn, E. Anciant, Roy Thompson, C. Marchand, M. Bellis, J. Shaw, M. R. Niroula, Michael Wood, J. P. Cummings, K. Hafidi, V. S. Serov, L. Elouadrhiri, C. Tur, B. P. Quinn, R. A. Schumacher, G. V. O'Rielly, R. Fatemi, B. Zhao, Kei Moriya, Federico Ronchetti, C. A. Meyer, Victor Mokeev, Z. W. Zhao, J. Hu, M. Khandaker, G. V. Fedotov, M. Kossov, L. Guo, M. Ungaro, B. L. Berman, D. G. Jenkins, Cynthia Marie Hadjidakis, S. Bültmann, T. A. Forest, A. V. Vlassov, I. Popa, I. I. Strakovsky, J. Langheinrich, S. S. Stepanyan, S. A. Philips, A. Coleman, S. Stepanyan, P. Eugenio, B. B. Niczyporuk, H. R. Weller, N. Baillie, M. Battaglieri, R. A. Miskimen, B. McKinnon, P. Dragovitsch, D. P. Weygand, M. Taiuti, J. Pierce, Avraham Klein, Shifeng Chen, Michael Dugger, Kwangsoo Kim, G. Riccardi, N. Pivnyuk, L. M. Qin, J. Napolitano, H. O. Funsten, R. Bradford, J. Yun, D. Cords, Friedrich Klein, M. Osipenko, F. W. Hersman, G. E. Dodge, S. McAleer, F. X. Girod, A. Yegneswaran, C. Butuceanu, R. J. Feuerbach, A. Deur, H. Denizli, Brian Raue, D. Branford, P. V. Degtyarenko, R. De Vita, N. Guler, P. Collins, Marco A. Huertas, M. Mirazita, J. M. Laget, P. L. Cole, M. Guidal, W. K. Brooks, K. Beard, J. Hardie, G. Niculescu, A. V. Skabelin, I. Niculescu, Giovanni Ricco, Atilla Gonenc, M. D. Mestayer, J. J. Manak, H. G. Juengst, P. Coltharp, D. Lawrence, M. Holtrop, J. W. Price, C. Paterson, R. De Masi, E. L. Isupov, P. Nadel-Turonski, M. M. Ito, C. Djalali, R. W. Gothe, Tsutomu Mibe, A.V. Stavinsky, M. Klusman, Michael L. Williams, E. De Sanctis, M. MacCormick, J. T. Goetz, J. Lachniet, D. I. Sober, G. Audit, C. E. Hyde-Wright, E. Polli, M. Guillo, J. D. Kellie, Valeria Muccifora, D. J. Tedeschi, K. Y. Kim, G. Gavalian, S. Tkachenko, V. Batourine, S. Boiarinov, B. M. Preedom, H. Y. Lu, Sergey Kuleshov, I. Bedlinskiy, M. Bektasoglu, N. Benmouna, M. Nozar, Gerard Gilfoyle, E. Wolin, B. Carnahan, Elton Smith, P. Ambrozewicz, D. Sokhan, A. Tkabladze, Nikolay Shvedunov, D. Rowntree, Lorenzo Zana, J. P. Santoro, W. Kim, J. P. Ball, Y. Prok, U. Thoma, R. S. Hakobyan, M. Anghinolfi, D. S. Carman, Sylvain Bouchigny, L. El Fassi, N. Natasha, N. Kalantarians, James Mueller, S. Niccolai, D. G. Crabb, J. Salamanca, Susan Taylor, P. Rossi, J. W C McNabb, D. P. Watts, H. Egiyan, P. D. Rubin, Y. G. Sharabian, V. Crede, J. R. Calarco, B. E. Stokes, G. S. Adams, H. S. Jo, K. Joo, N. A. Baltzell, K. A. Griffioen, N. Markov, Laird Kramer, Y. Ilieva, S. Strauch, G. S. Mutchler, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, Nicola Bianchi, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, G. Rosner, R. Nasseripour, A. Shafi, K. S. Egiyan, K. Livingston, R. Dickson, K. Mikhailov, S. Barrow, P. Stoler, K. Hicks, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, M. J. Amaryan, I. Hleiqawi, S. L. Careccia, S. Simionatto, P. Corvisiero, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, D. Doughty, D. Heddle, H. Hakobyan, Gerald Feldman, K. Wang, C. Salgado, and Michael Vineyard
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, Bremsstrahlung, Hyperon, Observable, Lambda, Polarization (waves), 01 natural sciences, Induced polarization, Nuclear physics, Recoil, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract: Spin transfer from circularly polarized real photons to recoiling hyperons has been measured for the reactions $$\vec\gamma + p \to K^+ + \vec\Lambda$$ and $$\vec\gamma + p \to K^+ + \vec\Sigma^0$$. The data were obtained using the CLAS detector at Jefferson Lab for center-of-mass energies $W$ between 1.6 and 2.53 GeV, and for $$-0.85
Published: 2007

25. Quark-hadron duality in spin structure functionsg1pandg1d

Author: Carlos A. Salgado, M. Amarian, Nikolay Shvedunov, S. Bültmann, M. Guidal, L. Morand, T. A. Forest, P. Dragovitsch, J. Pierce, Avraham Klein, Elton Smith, Gerard Gilfoyle, S. Niccolai, M. Holtrop, K. Livingston, G. E. Dodge, E. Wolin, Hall Crannell, Michael Vineyard, P. V. Degtyarenko, M. Anghinolfi, Hong Lu, J. Hardie, I. Niculescu, James Mueller, B. M. Preedom, D. Lawrence, P. D. Rubin, Y. G. Sharabian, P. Eugenio, R. De Masi, Lorenzo Zana, J. P. Santoro, V. Batourine, H. G. Juengst, J. Langheinrich, S. S. Stepanyan, S. A. Philips, R. Fatemi, B. Carnahan, F. Sabatié, H. S. Jo, D. Doughty, A. V. Vlassov, M. Taiuti, J. P. Ball, Y. Prok, A.V. Stavinsky, L. Elouadrhiri, N. Guler, P. Nadel-Turonski, Tsutomu Mibe, V. Gyurjyan, Federico Ronchetti, R. J. Feuerbach, V. Sapunenko, V. Crede, D. J. Tedeschi, J. P. Cummings, P. Stoler, Dinko Pocanic, D. Heddle, Daniel S. Carman, J. Zhang, B. E. Stokes, D. G. Crabb, S. E. Kuhn, C. E. Hyde-Wright, G. Ricco, J. R. Calarco, H. Denizli, G. Gavalian, N. Baillie, H. Bagdasaryan, J. W. Price, G. V. O'Rielly, I. Bedlinskiy, S. Tkachenko, M. Kossov, C. Tur, Ji Li, S. Barrow, A. Deur, K. Hicks, R. A. Miskimen, B. McKinnon, G. S. Adams, Jeffrey P. Donnelly, N. Benmouna, M. Ripani, Shifeng Chen, M. D. Mestayer, R. DeVita, Sergey Kuleshov, M. Bektasoglu, M. Nozar, E. L. Isupov, Cynthia Marie Hadjidakis, Michael L. Williams, L. M. Qin, J. W C McNabb, K. S. Egiyan, D. Branford, Friedrich Klein, Michael Dugger, P. L. Cole, S. Boiarinov, W. K. Brooks, J. Lachniet, Z. W. Zhao, A. Tkabladze, A. V. Skabelin, Brian Raue, H. O. Funsten, C. Paterson, J. T. Goetz, E. Polli, S. Stepanyan, P. Collins, M. Mirazita, S. A. Morrow, J. M. Laget, Victor Mokeev, J. J. Manak, D. Rowntree, M. Klusman, L. Todor, C. Djalali, K. Mikhailov, Marco A. Huertas, L. Guo, M. Ungaro, D. G. Jenkins, R. S. Hakobyan, Susan Taylor, E. Golovatch, Sylvain Bouchigny, D. Protopopescu, S. Pozdniakov, M. Garçon, C. D. Keith, Kwangsoo Kim, G. Riccardi, H. Egiyan, P. Rossi, P. Ambrozewicz, R. C. Minehart, C. Butuceanu, K. Joo, J. Yun, D. Cords, M. MacCormick, U. Thoma, G. Asryan, I. Hleiqawi, C. A. Meyer, A. Yegneswaran, O. P. Dzyubak, R. A. Niyazov, G. V. Fedotov, M. Bellis, S. L. Careccia, P. Corvisiero, E. De Sanctis, J. Kuhn, Roy Thompson, K. L. Giovanetti, D. I. Sober, M. Guillo, Larry Weinstein, B. B. Niczyporuk, S. McAleer, N. Pivnyuk, J. Napolitano, M. Khandaker, Y. Ilieva, F. X. Girod, D. P. Weygand, Atilla Gonenc, G. Rosner, P. Bosted, R. Nasseripour, P. Coltharp, M. M. Ito, L. C. Smith, B. S. Ishkhanov, A. Cazes, Maryam Moteabbed, Bernhard Mecking, M. R. Niroula, K. V. Dharmawardane, M. Osipenko, K. Beard, W. Kim, M. Battaglieri, G. Niculescu, R. Bradford, K. Lukashin, L. C. Dennis, Laird Kramer, B. E. Bonner, H. Avakian, E. Pasyuk, S. A. Dytman, N. Markov, K. Park, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, V. P. Kubarovsky, O. Pogorelko, J. Shaw, Michael Wood, K. Hafidi, V. S. Serov, S. Strauch, R. Suleiman, G. S. Mutchler, N. A. Baltzell, K. A. Griffioen, J. D. Kellie, R. W. Gothe, K. Y. Kim, B. Zhao, F. W. Hersman, and R. A. Schumacher
Subjects: Physics, Quantum chromodynamics, Quark, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Duality (optimization), 01 natural sciences, Resonance (particle physics), Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Spin-½
Abstract: New measurements of the spin structure functions of the proton and deuteron g1p(x,Q2) and g1d(x,Q2) in the nucleon resonance region are compared with extrapolations of target-mass-corrected next-to-leading-order (NLO) QCD fits to higher energy data. Averaged over the entire resonance region (W 1.7 GeV2. This global duality appears to result from cancellations among the prominent local resonance regions: in particular strong sigma{3/2} contributions in the Delta(1232) region appear to be compensated by strong sigma{1/2} contributions in the resonance region centered on 1.5 GeV. These results are encouraging for the extension of NLO QCD fits to lower W and Q2 than have been used previously.
Published: 2007

26. Measurement of coherent $\phi$-meson photoproduction on deuteron at low energies

Author: J. P. Cummings, M. Kossov, V. Gyurjyan, H. Bagdasaryan, J. Langheinrich, S. S. Stepanyan, F. Sabatié, M. Nozar, G. Audit, C. E. Hyde-Wright, Friedrich Klein, Brian Raue, Sergey Kuleshov, A. V. Vlassov, T. Lee, M. H. Wood, Marco Ripani, R. De Vita, Shifeng Chen, Federico Ronchetti, S. Anefalos Pereira, P. Mattione, E. De Sanctis, D. I. Sober, J. T. Goetz, Elton Smith, P. Eugenio, Lorenzo Zana, J. P. Santoro, M. Taiuti, J. Donnelly, G. Asryan, H. Hakobyan, G. S. Mutchler, Gerald Feldman, O. P. Dzyubak, M. Anghinolfi, B. B. Niczyporuk, C. Salgado, M. Guidal, N. Pivnyuk, M. Battaglieri, Y. G. Sharabian, P. Collins, B. L. Berman, C. Djalali, M. Holtrop, J. J. Melone, I. I. Strakovsky, M. D. Mestayer, K. Kramer, E. L. Isupov, C. Paterson, P. Ambrozewicz, A. Deur, S. Boiarinov, R. Bradford, Y. Ilieva, K. S. Egiyan, N. A. Baltzell, J. Kuhn, K. Mikhailov, J. Salamanca, W. K. Brooks, V. Sapunenko, K. A. Griffioen, Dinko Pocanic, N. Dashyan, Michael Vineyard, Latifa Elouadrhiri, S. E. Kuhn, R. C. Minehart, Kei Moriya, L. Todor, Jia Li, C. A. Meyer, C. Tur, G. V. Fedotov, Z. Krahn, B. Zhao, M. Bellis, G. Gavalian, D. P. Weygand, S. Tkachenko, N. Baillie, S. A. Morrow, P. Stoler, Alexei V. Klimenko, N. Benmouna, R. A. Miskimen, B. McKinnon, Barry Ritchie, K. Hicks, F. W. Hersman, Nikolay Shvedunov, D. Branford, M. Mirazita, J. M. Laget, U. Thoma, Maryam Moteabbed, H. Avakian, A. I. Ostrovidov, Bernhard Mecking, N. Kalantarians, K. V. Dharmawardane, R. W. Gothe, D. G. Ireland, D. Sharov, Volker D. Burkert, A. S. Biselli, Cynthia Marie Hadjidakis, Michael Dugger, R. A. Schumacher, M. MacCormick, H. O. Funsten, W. J. Briscoe, E. Pasyuk, N. Markov, Z. W. Zhao, G. Riccardi, Gerard Gilfoyle, D. G. Jenkins, C. I O Gordon, D. Sokhan, C. Butuceanu, K. Park, E. Wolin, Laird Kramer, S. Bültmann, P. Rossi, F. X. Girod, L. Blaszczyk, J. P. Ball, Y. Prok, Mathew Williams, S. Stepanyan, D. S. Carman, C. Hanretty, V. P. Kubarovsky, Haiyan Gao, J. Pierce, Avraham Klein, J. R. Johnstone, L. Guo, M. Ungaro, O. Pogorelko, K. Joo, V. Crede, R. A. Niyazov, A. Yegneswaran, S. Niccolai, D. G. Crabb, G. E. Dodge, H. Y. Lu, J. R. Calarco, Giovanni Ricco, Atilla Gonenc, P. V. Degtyarenko, J. W. Price, B. E. Stokes, K. Hafidi, V. S. Serov, I. Niculescu, D. Lawrence, H. S. Jo, R. De Masi, Hall Crannell, C. Marchand, G. Rosner, R. Nasseripour, J. D. Kellie, V. Mokeev, S. Bouchigny, P. Coltharp, Jian Zhang, W. Kim, M. M. Ito, G. Niculescu, K. Livingston, M. Osipenko, R. Dickson, M. Khandaker, L. C. Smith, E. Munevar, B. S. Ishkhanov, N. Guler, M. R. Niroula, D. Doughty, V. Kuznetsov, P. Nadel-Turonski, Tsutomu Mibe, P. L. Cole, J. Lachniet, A. Tkabladze, S. Strauch, D. P. Watts, J. Hardie, H. G. Juengst, D. Protopopescu, R. S. Hakobyan, H. Egiyan, L. El Fassi, M. J. Amaryan, S. Pozdniakov, M. Garçon, A.V. Stavinsky, I. Hleiqawi, S. L. Careccia, D. J. Tedeschi, I. Bedlinskiy, K. L. Giovanetti, Larry Weinstein, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, Hadron, Elementary particle, Physics and Astronomy(all), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Particle identification, Nuclear physics, Particle decay, 0103 physical sciences, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, 13.25.-k, 13.75.-n, 14.40.Cs, 25.20.Lj, Vector meson dominance, Phi meson, Helicity, High Energy Physics::Experiment
Abstract: The cross section and decay angular distributions for the coherent \phi meson photoproduction on the deuteron have been measured for the first time up to a squared four-momentum transfer t =(p_{\gamma}-p_{\phi})^2 =-2 GeV^2/c^2, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cross sections are compared with predictions from a re-scattering model. In a framework of vector meson dominance, the data are consistent with the total \phi-N cross section \sigma_{\phi N} at about 10 mb. If vector meson dominance is violated, a larger \sigma_{\phi N} is possible by introducing larger t-slope for the \phi N \to \phi N process than that for the \gamma N \to \phi N process. The decay angular distributions of the \phi are consistent with helicity conservation., Comment: 6 pages
Published: 2007

27. 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

28. 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

29. Search for theΘ+pentaquark in the reactionsγp→K¯0K+nandγp→K¯0K0p

Author: Latifa Elouadrhiri, R. C. Minehart, C. A. Meyer, G. V. Fedotov, Ji Li, J. Donnelly, G. Asryan, Elton Smith, O. P. Dzyubak, B. L. Berman, M. F. Vineyard, F. X. Girod, M. Anghinolfi, M. D. Mestayer, D. P. Weygand, E. L. Isupov, Michael L. Williams, H. Avakian, Y. G. Sharabian, M. Guidal, Atilla Gonenc, S. Boiarinov, C. Paterson, L. C. Smith, J. Goett, B. S. Ishkhanov, J. W. Price, M. Holtrop, Shifeng Chen, M. J. Amaryan, R. De Masi, M. Bellis, N. A. Baltzell, I. I. Strakovsky, P. Eugenio, K. A. Griffioen, K. S. Egiyan, Daniel S. Carman, J. P. Cummings, V. Batourine, C. E. Hyde-Wright, Sergey Kuleshov, M. Nozar, M. R. Niroula, W. J. Briscoe, M. Taiuti, E. Pasyuk, J. T. Goetz, R. De Vita, R. A. Schumacher, J. D. Kellie, O. Glamazdin, Alexei V. Klimenko, H. G. Juengst, Nikolay Shvedunov, F. Sabatié, K. Mikhailov, J. Langheinrich, S. S. Stepanyan, M. Kossov, V. Mochalov, A. Deur, V. Sapunenko, L. Todor, S. Strauch, Maryam Moteabbed, Bernhard Mecking, Z. W. Zhao, D. P. Watts, K. Park, K. V. Dharmawardane, A.V. Stavinsky, Dinko Pocanic, P. Collins, H. Egiyan, D. G. Jenkins, Lorenzo Zana, Ashot Gasparian, C. I O Gordon, J. J. Melone, S. E. Kuhn, W. K. Brooks, M. Battaglieri, H. Hakobyan, D. J. Tedeschi, H. S. Jo, C. Tur, S. Bültmann, V. P. Kubarovsky, P. Coltharp, S. A. Morrow, C. Djalali, P. Stoler, R. Bradford, C. Salgado, M. Khandaker, Barry Ritchie, L. Morand, O. Pogorelko, I. Bedlinskiy, P. Ambrozewicz, S. Stepanyan, G. S. Mutchler, K. Hicks, J. Kuhn, M. M. Ito, J. Pierce, Avraham Klein, V. Gyurjyan, J. P. Santoro, G. Gavalian, Michael Wood, K. Hafidi, B. B. Niczyporuk, S. Tkachenko, N. Benmouna, N. Pivnyuk, Hall Crannell, V. S. Serov, M. Ripani, M. MacCormick, I. Hleiqawi, G. Riccardi, Cynthia Marie Hadjidakis, A. Teymurazyan, S. L. Careccia, G. E. Dodge, H. Y. Lu, S. Niccolai, Michael Dugger, P. V. Degtyarenko, J. Hardie, H. O. Funsten, I. Niculescu, D. Lawrence, K. L. Giovanetti, C. Butuceanu, J. Zhang, Larry Weinstein, D. Doughty, E. Clinton, H. Bagdasaryan, G. Rosner, L. Gan, E. Wolin, R. Nasseripour, A. V. Vlassov, L. Guo, J. P. Ball, Y. Prok, M. Ungaro, T. Lee, D. G. Crabb, B. E. Stokes, V. Crede, J. R. Calarco, K. Joo, R. A. Niyazov, A. Yegneswaran, E. De Sanctis, D. I. Sober, B. Zhao, Victor Mokeev, I. Nakagawa, Sylvain Bouchigny, G. Ricco, M. Y. Gabrielyan, P. Rossi, Friedrich Klein, Brian Raue, F. W. Hersman, W. Kim, Federico Ronchetti, G. Niculescu, R. W. Gothe, M. Osipenko, U. Thoma, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, J. Lachniet, A. Tkabladze, K. Livingston, D. S. Dale, R. S. Hakobyan, L. El Fassi, N. Guler, E. N. Golovach, Gerard Gilfoyle, D. Protopopescu, S. Pozdniakov, M. Garçon, Y. Ilieva, N. Baillie, R. A. Miskimen, B. McKinnon, Laird Kramer, D. Branford, M. Mirazita, J. M. Laget, N. Markov, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, and A. S. Biselli
Subjects: Physics, Nuclear and High Energy Physics, Meson, Proton, 010308 nuclear & particles physics, Lambda baryon, 01 natural sciences, Pentaquark, Baryon, Crystallography, Particle decay, 0103 physical sciences, Mass spectrum, Production (computer science), Atomic physics, 010306 general physics
Abstract: The exclusive reactions {gamma}p {yields} {bar K}{sup 0} K{sup +} n and {gamma}p {yields} {bar K}{sup 0} K{sup 0} p have been studied in the photon energy range 1.6--3.8 GeV, searching for evidence of the exotic baryon {Theta}{sup +}(1540) in the decays {Theta}{sup +} {yields} nK{sup +} and {Theta}{sup +} {yields} pK{sup 0}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The integrated luminosity was about 70 pb{sup -1}. The reactions have been isolated by detecting the K{sup +} and proton directly, the neutral kaon via its decay to K{sub S} {yields} {pi}{sup +}{pi}{sup -} and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as {Sigma}{sup +}, {Sigma}{sup -} and {Lambda}(1116) were used as a check of the mass determination accuracy and experimental resolution. Approximately 100,000 {Lambda}*(1520)'s and 150,000 {phi}'s were observed in the {bar K}{sup 0} K{sup +} n and {bar K}{sup 0} K{sup 0} p final state respectively. No evidence for the {Theta}{sup +} pentaquark was found in the nK{sup +} or pK{sub S} invariant mass spectra. Upper limits were set on the production cross section of the reaction {gamma}p {yields} {Theta}{supmore » +} {bar K}{sup 0} as functions of center-of-mass angle, nK{sup +} and pK{sub S} masses. Combining the results of the two reactions, the 95% C.L. upper limit on the total cross section for a resonance peaked at 1540 MeV was found to be 0.7 nb. Within most of the available theoretical models, this corresponds to an upper limit on the {Theta}{sup +} width, {Gamma}{sub {Theta}{sup +}}, ranging between 0.01 and 7 MeV.« less
Published: 2006

30. 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

31. 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

32. Measurement of the deuteron structure functionF2in the resonance region and evaluation of its moments

Author: B. E. Stokes, G. S. Adams, Daniel S. Carman, J. P. Cummings, K. Joo, M. Guillo, G. Audit, C. E. Hyde-Wright, B. M. Preedom, M. Kossov, Susan Taylor, S. Strauch, C. Marchand, H. Egiyan, Silvano Simula, Lorenzo Zana, J. P. Santoro, P. Eugenio, K. Park, M. Taiuti, H. S. Jo, M. Nozar, G. V. O'Rielly, I. Hleiqawi, Alexei V. Klimenko, K. S. Egiyan, S. L. Careccia, J. R. Calarco, W. Kim, Y. Ilieva, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, M. Khandaker, K. Mikhailov, V. P. Kubarovsky, C. Salgado, Barry Ritchie, M. Battaglieri, D. Doughty, G. Niculescu, R. DeVita, J. W C McNabb, D. Heddle, R. J. Feuerbach, R. A. Schumacher, D. G. Jenkins, A. Empl, N. A. Baltzell, L. C. Smith, B. S. Ishkhanov, E. Wolin, O. Pogorelko, Shifeng Chen, H. G. Juengst, R. Bradford, K. Lukashin, J. J. Melone, E. Golovatch, S. McAleer, K. A. Griffioen, S. A. Morrow, M. Guidal, H. Denizli, C. Djalali, F. X. Girod, J. P. Ball, Y. Prok, A.V. Stavinsky, Ji Li, L. M. Qin, A. V. Skabelin, Marco A. Huertas, Federico Ronchetti, J. Donnelly, G. Rosner, R. Nasseripour, J. D. Kellie, D. G. Crabb, J. T. Goetz, E. Polli, U. Thoma, C. I O Gordon, M. Holtrop, G. Asryan, L. Todor, D. J. Tedeschi, D. Protopopescu, M. D. Mestayer, G. Gavalian, R. C. Minehart, P. Ambrozewicz, L. Elouadrhiri, S. Pozdniakov, M. Garçon, O. P. Dzyubak, A. Cazes, V. Sapunenko, Dinko Pocanic, Sylvain Bouchigny, C. A. Meyer, N. Benmouna, M. Ripani, J. Shaw, G. V. Fedotov, Michael L. Williams, Bernhard Mecking, J. Kuhn, K. V. Dharmawardane, J. W. Price, M. Osipenko, I. Bedlinskiy, M. Klusman, P. Rossi, P. Corvisiero, S. E. Kuhn, S. Boiarinov, S. Bültmann, A. Tkabladze, Michael Wood, D. P. Weygand, A. Deur, Roy Thompson, K. Beard, R. Suleiman, G. Ricco, C. Tur, L. Morand, T. A. Forest, P. Coltharp, V. S. Serov, L. C. Dennis, B. E. Bonner, W. K. Brooks, Cynthia Marie Hadjidakis, G. S. Mutchler, S. Stepanyan, H. Avakian, Michael Dugger, H. O. Funsten, K. Livingston, M. M. Ito, Michael Vineyard, P. Stoler, J. Pierce, Avraham Klein, J. Langheinrich, S. S. Stepanyan, S. A. Philips, B. B. Niczyporuk, Elton Smith, M. Anghinolfi, N. Pivnyuk, J. Napolitano, V. Batourine, S. Mehrabyan, James Mueller, F. Sabatié, P. D. Rubin, E. Pasyuk, P. Dragovitsch, N. Guler, G. Nefedov, K. Hicks, S. A. Dytman, M. Bellis, S. Niccolai, Y. G. Sharabian, G. E. Dodge, J. Hardie, Friedrich Klein, S. Barrow, Brian Raue, P. V. Degtyarenko, Kwangsoo Kim, G. Riccardi, J. Hu, A. Coleman, F. W. Hersman, I. Niculescu, D. Lawrence, C. Butuceanu, Gerard Gilfoyle, R. W. Gothe, R. A. Miskimen, K. Y. Kim, B. McKinnon, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, N. Baillie, E. De Sanctis, D. I. Sober, R. Fatemi, A. V. Vlassov, T. Lee, J. J. Manak, A. I. Ostrovidov, A. C S Lima, D. G. Ireland, Volker D. Burkert, A. S. Biselli, M. Bektasoglu, J. Lachniet, D. Rowntree, R. S. Hakobyan, P. Nadel-Turonski, P. L. Cole, L. Guo, M. Ungaro, R. A. Niyazov, J. Yun, D. Cords, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, and Victor Mokeev
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Scattering, Hadron, Resonance, 01 natural sciences, Nuclear physics, Cover (topology), 0103 physical sciences, Invariant mass, Operator product expansion, Twist, 010306 general physics
Abstract: Inclusive electron scattering off the deuteron has been measured to extract the deuteron structure function F{sub 2} with the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. The measurement covers the entire resonance region from the quasielastic peak up to the invariant mass of the final-state hadronic system W{approx_equal}2.7 GeV with four-momentum transfers Q{sup 2} from 0.4 to 6 (GeV/c){sup 2}. These data are complementary to previous measurements of the proton structure function F{sub 2} and cover a similar two-dimensional region of Q{sup 2} and Bjorken variable x. Determination of the deuteron F{sub 2} over a large x interval including the quasielastic peak as a function of Q{sup 2}, together with the other world data, permit a direct evaluation of the structure function moments for the first time. By fitting the Q{sup 2} evolution of these moments with an OPE-based twist expansion we have obtained a separation of the leading twist and higher twist terms. The observed Q{sup 2} behavior of the higher twist contribution suggests a partial cancelation of different higher twists entering into the expansion with opposite signs. This cancelation, found also in the proton moments, is a manifestation of the 'duality' phenomenon inmore » the F{sub 2} structure function.« less
Published: 2006

33. 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

34. Singleπ+electroproduction on the proton in the first and second resonance regions at0.25GeV2<Q2<0.65GeV2

Author: J. Kuhn, Shifeng Chen, R. J. Feuerbach, Roy Thompson, R. W. Gothe, K. Y. Kim, C. Cetina, Y. Kuang, V. Gyurjyan, J. Zhang, E. Anciant, Michael Vineyard, M. Guidal, G. E. Dodge, H. Bagdasaryan, E. Polli, F. W. Hersman, G. Gavalian, K. S. Egiyan, G. Niculescu, Daijin Kim, Min Suk Kim, S. Stepanyan, P. V. Degtyarenko, L. M. Qin, Sylvain Bouchigny, N. Benmouna, M. Ripani, M. Khandaker, K. A. Griffioen, G. Ricco, K. Mikhailov, P. Rossi, M. Holtrop, H. Denizli, Elton Smith, P. Eugenio, M. Taiuti, Philip L. Cole, Ji Li, F. Ronchetti, K. Livingston, E. DeSanctis, G. V. O'Rielly, M. Klusman, M. Anghinolfi, James Mueller, I. Niculescu, Moshe Gai, A. V. Skabelin, E. Wolin, I. G. Aznauryan, I. Hleiqawi, P. D. Rubin, Y. G. Sharabian, J. P. Cummings, D. G. Jenkins, Friedrich Klein, Victor Mokeev, D. Lawrence, S. L. Careccia, S. Simionatto, M. D. Mestayer, Alexei V. Klimenko, K. Sabourov, M. Osipenko, J. Langheinrich, R. DeVita, J. D. Kellie, J. W C McNabb, R. S. Hicks, Brian Raue, J. Lachniet, P. Stoler, J. R. Calarco, L. C. Smith, S. J. Gaff, B. S. Ishkhanov, S. A. Philips, Barry Ritchie, K. Beard, P. Dragovitsch, Dinko Pocanic, M. Kossov, G. T. Goetz, D. Rowntree, Rakhsha Nasseripour, S. McAleer, S. O. Nelson, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, L. Guo, M. Ungaro, J. J. Melone, Bernhard Mecking, K. Hicks, S. E. Kuhn, B. Carnahan, F. Sabatié, Latifa Elouadrhiri, W. Kim, K. V. Dharmawardane, D. Doughty, D. Heddle, J. P. Ball, Y. Prok, R. C. Minehart, Cynthia Marie Hadjidakis, C. A. Meyer, B. B. Niczyporuk, J. H. Kelley, S. Niccolai, G. V. Fedotov, C. Tur, Shalev Gilad, Thierry Auger, Michael Dugger, N. Guler, S. Boiarinov, B. M. Preedom, A. Tkabladze, R. S. Hakobyan, O. P. Dzyubak, Daniel S. Carman, Susan Taylor, S. Strauch, G. A. Peterson, H. O. Funsten, M. Eckhause, D. P. Weygand, J. W. Price, J. Hardie, N. Pivnyuk, J. Napolitano, A. Longhi, G. Audit, K. Joo, C. E. Hyde-Wright, R. A. Niyazov, J. Yun, D. Cords, H. Egiyan, A. Yegneswaran, J. P. Santoro, P. Corvisiero, M. Sargsyan, A.V. Stavinsky, N. Baltzel, Hall Crannell, S. A. Morrow, S. Barrow, L. C. Dennis, B. E. Bonner, C. S. Whisnant, C. Djalali, D. J. Tedeschi, C. Marchand, Gerald Feldman, R. A. Schumacher, H. Avakian, J. Hu, M. Nozar, A. Coleman, L. Todor, M. Battaglieri, H. R. Weller, P. Ambrozewicz, K. Wang, C. Salgado, D. Protopopescu, S. Pozdniakov, C. I O Gordon, R. Bradford, K. Lukashin, D. G. Crabb, G. S. Mutchler, Z. L. Zhou, G. Rosner, J. Donnely, A. Shafi, L. Morand, T. A. Forest, W. J. Briscoe, E. Pasyuk, Avraham Klein, S. A. Dytman, G. S. Adams, Y. Ilieva, M. Bellis, K. Park, M. M. Ito, R. Fatemi, A. V. Vlassov, V. P. Kubarovsky, A. Empl, O. Pogorelko, J. J. Manak, Patrick Girard, J. Shaw, Michael Wood, V. S. Serov, Nicola Bianchi, D. I. Sober, L. Y. Murphy, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, Laird Kramer, M. Bektasoglu, D. G. Ireland, Volker D. Burkert, Jing Zhao, A. S. Biselli, R. A. Miskimen, B. McKinnon, H. G. Juengst, D. Branford, M. Mirazita, J. M. Laget, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, U. Thoma, M. Guillo, I. I. Strakovsky, and W. K. Brooks
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, Resonance, Sigma, 01 natural sciences, 7. Clean energy, Helicity, Particle identification, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The ep {yields} e'pi{sup +}n reaction was studied in the first and second nucleon resonance regions in the 0.25 GeV{sup 2} < Q{sup 2} < 0.65 GeV{sup 2} range using the CLAS detector at Thomas Jefferson National Accelerator Facility. For the first time the absolute cross sections were measured covering nearly the full angular range in the hadronic center-of-mass frame. The structure functions {sigma}{sub TL}, {sigma}{sub TT} and the linear combination {sigma}{sub T} + {epsilon}{sigma}{sub L} were extracted by fitting the {phi}-dependence of the measured cross sections, and were compared to the MAID and Sato-Lee models.
Published: 2006

35. $\eta$' Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV

Author: K. S. Egiyan, I. Hleiqawi, L. C. Smith, B. S. Ishkhanov, R. Fatemi, L. C. Dennis, B. E. Bonner, S. L. Careccia, S. Simionatto, A. V. Vlassov, K. Mikhailov, H. Avakian, V. Mokeev, T. Lee, V. Sapunenko, K. L. Giovanetti, B. Asavapibhop, Bernhard Mecking, K. V. Dharmawardane, Dinko Pocanic, Larry Weinstein, Marco A. Huertas, M. Battaglieri, R. Bradford, K. Lukashin, W. J. Briscoe, R. C. Minehart, C. A. Meyer, S. E. Kuhn, E. Pasyuk, D. Doughty, M. Bellis, G. V. Fedotov, Daniel S. Carman, J. J. Manak, S. A. Dytman, N. A. Baltzell, Sylvain Bouchigny, L. C. Maximon, R. J. Feuerbach, J. Hu, B. M. Preedom, D. Heddle, Laird Kramer, G. Audit, C. E. Hyde-Wright, K. Livingston, J. P. Cummings, K. A. Griffioen, G. Ricco, P. Rossi, M. Guillo, C. Tur, A. Coleman, H. R. Weller, D. P. Weygand, R. A. Schumacher, J. Donnelly, G. Asryan, L. Elouadrhiri, W. Kim, S. McAleer, G. Niculescu, F. X. Girod, O. P. Dzyubak, R. A. Niyazov, V. Batourine, Lorenzo Zana, Shifeng Chen, J. Kuhn, M. Kossov, J. D. Kellie, J. Shaw, I. I. Strakovsky, G. Gavalian, J. P. Santoro, Alexei V. Klimenko, S. Tkachenko, E. De Sanctis, Michael Wood, P. Corvisiero, M. Bektasoglu, E. Anciant, M. Nozar, A. Deur, E. Wolin, S. Bültmann, N. Benmouna, M. Ripani, J. R. Calarco, V. S. Serov, T. A. Forest, B. Carnahan, D. I. Sober, N. Guler, Y. Prok, Barry Ritchie, A. I. Ostrovidov, A. C S Lima, H. S. Jo, Friedrich Klein, S. Stepanyan, Roy Thompson, J. Langheinrich, J. Pierce, Avraham Klein, K. Park, S. S. Stepanyan, M. Khandaker, S. A. Philips, D. G. Ireland, J. T. Goetz, J. P. Ball, G. S. Mutchler, Gerald Feldman, P. Coltharp, W. K. Brooks, F. W. Hersman, Cynthia Marie Hadjidakis, Michael Dugger, K. Wang, Brian Raue, G. E. Dodge, C. Salgado, P. Stoler, H. O. Funsten, V. P. Kubarovsky, N. Baillie, Volker D. Burkert, A. S. Biselli, S. Barrow, M. M. Ito, D. G. Crabb, Elton Smith, H. Denizli, P. V. Degtyarenko, J. W. Price, A. Empl, O. Pogorelko, Valeria Muccifora, Y. Ilieva, P. Eugenio, Susan Taylor, M. Guidal, M. Osipenko, F. Sabatié, S. Strauch, K. Hicks, M. Anghinolfi, M. Taiuti, A. V. Skabelin, P. Dragovitsch, James Mueller, H. Egiyan, K. Beard, D. Lawrence, B. L. Berman, M. Holtrop, P. D. Rubin, Gerard Gilfoyle, Y. G. Sharabian, L. M. Qin, Nicola Bianchi, Federico Ronchetti, Kalvir S. Dhuga, R. A. Miskimen, B. McKinnon, S. Niccolai, G. V. O'Rielly, P. Collins, M. D. Mestayer, Kwangsoo Kim, G. Riccardi, D. Protopopescu, P. Nadel-Turonski, S. Pozdniakov, M. Garçon, J. Hardie, Tsutomu Mibe, C. Butuceanu, A. Shafi, H. G. Juengst, Michael L. Williams, Hall Crannell, C. Marchand, D. G. Jenkins, C. Paterson, M. Klusman, D. Branford, M. Mirazita, J. M. Laget, A.V. Stavinsky, D. J. Tedeschi, S. Boiarinov, R. W. Gothe, I. Bedlinskiy, K. Y. Kim, U. Thoma, Michael Vineyard, B. E. Stokes, G. S. Adams, J. Lachniet, V. Gyurjyan, A. Tkabladze, D. Rowntree, K. Joo, J. Zhang, H. Bagdasaryan, L. Guo, M. Spraker, M. Ungaro, J. Yun, D. Cords, A. Yegneswaran, R. S. Hakobyan, P. L. Cole, G. Rosner, R. Nasseripour, R. DeVita, J. W C McNabb, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, S. A. Morrow, C. Djalali, P. Ambrozewicz, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Thomas Jefferson National Accelerator Facility (Jefferson Lab), and CLAS
Subjects: Photon, Proton, eta meson resonances, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, 13.60.Le, 14.20.Gk, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, Spectrometer, 010308 nuclear & particles physics, Scattering, Coupling (probability), meson photoproduction, photon-proton interactions, Mass spectrum, N channel, High Energy Physics::Experiment, baryon resonances, Atomic physics
Abstract: Differential cross sections for the reaction gamma p -> eta-prime p have been measured with the CLAS spectrometer and a tagged photon beam with energies from 1.527 to 2.227 GeV. The results reported here possess much greater accuracy than previous measurements. Analyses of these data indicate for the first time the coupling of the etaprime N channel to both the S_11(1535) and P_11(1710) resonances, known to couple strongly to the eta N channel in photoproduction on the proton, and the importance of j=3/2 resonances in the process., 6 pages, 3 figures
Published: 2006

36. MEASUREMENT OF DEEPLY VIRTUAL COMPTON SCATTERING WITH A POLARIZED PROTON TARGET

Author: B. E. Bonner, H. Avakian, Marco A. Huertas, D. Doughty, Sylvain Bouchigny, Daniel S. Carman, P. Rossi, S. Barrow, W. J. Briscoe, V. Batourine, C. E. Hyde-Wright, S. A. Dytman, P. Nadel-Turonski, Tsutomu Mibe, Y. Ilieva, B. Carnahan, Sergey Kuleshov, Ji Li, M. Bektasoglu, E. Wolin, M. Ripani, M. Nozar, R. J. Feuerbach, P. Coltharp, A. V. Vlassov, M. D. Mestayer, J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Khandaker, E. L. Isupov, V. Sapunenko, J. Kuhn, B. McKinnon, J. P. Ball, Y. Prok, M. M. Ito, Michael L. Williams, J. Shaw, Michael Wood, S. Strauch, A. I. Ostrovidov, A. C S Lima, L. Todor, S. Boiarinov, K. Hafidi, D. Protopopescu, Friedrich Klein, D. J. Tedeschi, S. Pozdniakov, M. Garçon, B. L. Berman, H. Y. Lu, D. Branford, M. Guidal, R. W. Gothe, D. G. Ireland, D. G. Crabb, L. M. Qin, Hall Crannell, V. S. Serov, M. Mirazita, J. M. Laget, A. Yegneswaran, Volker D. Burkert, A. S. Biselli, K. Y. Kim, G. Rosner, K. Park, M. Bellis, R. Nasseripour, M. Holtrop, C. Paterson, R. Suleiman, G. S. Mutchler, K.H. Hicks, D. P. Watts, H. Egiyan, N. A. Baltzell, M. Klusman, Michael Vineyard, M. Osipenko, F. Sabatié, Laird Kramer, K. A. Griffioen, B. E. Stokes, P. Stoler, B. M. Preedom, N. Markov, V. Crede, G. S. Adams, K. Beard, L. C. Smith, M. Amarian, Lorenzo Zana, J. P. Santoro, B. S. Ishkhanov, P. Eugenio, Federico Ronchetti, V. P. Kubarovsky, J. R. Calarco, Kalvir S. Dhuga, Nikolay Shvedunov, H. Hakobyan, R. A. Schumacher, M. Taiuti, H. S. Jo, W. Kim, G. Niculescu, Gerard Gilfoyle, M. R. Niroula, M. MacCormick, I. Hleiqawi, S. L. Careccia, J. D. Kellie, U. Thoma, Gerald Feldman, C. Salgado, N. Guler, S. Niccolai, M. Battaglieri, P. Collins, N. Natasha, E. De Sanctis, K. L. Giovanetti, S. Bültmann, L. Morand, Larry Weinstein, T. A. Forest, D. I. Sober, R. Fatemi, S. Stepanyan, N. Baillie, J. Hardie, K. S. Egiyan, R. Bradford, K. Lukashin, J. Pierce, Avraham Klein, B. Zhao, G. E. Dodge, E. Golovatch, K. Mikhailov, P. V. Degtyarenko, P. Bosted, I. Niculescu, D. Lawrence, A. Cazes, Maryam Moteabbed, Bernhard Mecking, R. De Masi, F. W. Hersman, C. D. Keith, K. V. Dharmawardane, S. Tkachenko, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Kwangsoo Kim, G. Riccardi, B. A. Raue, Cynthia Marie Hadjidakis, Chaden Djalali, C. Butuceanu, Michael Dugger, H. O. Funsten, P. Corvisiero, H. G. Juengst, G. Gavalian, H. Denizli, N. Benmouna, A.V. Stavinsky, I. Bedlinskiy, A. V. Skabelin, Marc Vanderhaeghen, Barry Ritchie, Victor Mokeev, L. Guo, M. Ungaro, Latifa Elouadrhiri, K. Joo, R. C. Minehart, C. A. Meyer, J. Yun, D. Cords, G. V. Fedotov, D. P. Weygand, J. Zhang, M. Guillo, H. Bagdasaryan, I. I. Strakovsky, A. Deur, W. K. Brooks, J. Lachniet, A. Tkabladze, D. Rowntree, G. V. O'Rielly, R. S. Hakobyan, L. El Fassi, Z. W. Zhao, D. G. Jenkins, B. B. Niczyporuk, P. L. Cole, S. McAleer, F. X. Girod, N. Pivnyuk, D. Heddle, J. Napolitano, Giovanni Ricco, Atilla Gonenc, J. W. Price, O. Pogorelko, R. Miskimen, R. DeVita, J. W C McNabb, S. A. Morrow, P. Ambrozewicz, Shifeng Chen, J. P. Cummings, M. Kossov, I. Popa, J. T. Goetz, E. Polli, V. Gyurjyan, Dinko Pocanic, S. E. Kuhn, C. Tur, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, K. Livingston, L. C. Dennis, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CEA- Saclay (CEA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Photon, Proton, Nuclear Theory, media_common.quotation_subject, General Physics and Astronomy, FOS: Physical sciences, Parton, Electron, 01 natural sciences, Asymmetry, High Energy Physics - Experiment, Nuclear physics, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), GENERALIZED PARTON DISTRIBUTIONS, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, NUCLEON, Spin-½, media_common, Physics, 010308 nuclear & particles physics, Compton scattering, High Energy Physics - Phenomenology, High Energy Physics::Experiment, GENERALIZED PARTON DISTRIBUTIONS, NUCLEON, CLAS, 13.60.Fz, 13.60.Hb, 14.20.Dh, Nucleon
Abstract: The longitudinal target-spin asymmetry A_UL for the exclusive electroproduction of high energy photons was measured for the first time in p(e,e'p\gamma). The data have been accumulated at Jefferson Lab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH_3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the Deeply Virtual Compton Scattering and Bethe-Heitler processes. The amplitude of the sin(phi) moment is 0.252 +/- 0.042(stat) +/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H and H-tilde., Comment: Modified text slightly, added references
Published: 2006

37. Measurement of the polarized structure functionσLT'for pion electroproduction in the Roper-resonance region

Author: H. Avakian, L. Elouadrhiri, V. Gyurjyan, J. Zhang, H. Bagdasaryan, A.V. Stavinsky, M. Osipenko, V. Batourine, E. Anciant, L. Guo, M. Ungaro, P. Stoler, R. Fatemi, D. J. Tedeschi, I. I. Strakovsky, A. Deur, A. V. Vlassov, K. Joo, N. A. Baltzell, R. A. Niyazov, J. Yun, D. Cords, A. Yegneswaran, M. Bektasoglu, R. A. Schumacher, B. Carnahan, F. Sabatié, W. J. Briscoe, E. Pasyuk, Thierry Auger, K. Beard, S. A. Dytman, I. Bedlinskiy, T. Lee, J. P. Cummings, W. K. Brooks, E. Wolin, K. A. Griffioen, S. Strauch, S. O. Nelson, K. Hicks, M. Kossov, Susan Taylor, R. A. Miskimen, B. McKinnon, H. G. Juengst, J. J. Manak, G. Gavalian, M. Khandaker, J. Lachniet, S. Bueltmann, J. Kuhn, Kalvir S. Dhuga, V. Mokeev, Shifeng Chen, T. A. Forest, J. P. Ball, M. Bellis, Patrick Girard, L. C. Maximon, J. Donnelly, G. Asryan, O. P. Dzyubak, N. Benmouna, M. Ripani, D. Rowntree, H. Egiyan, S. Stepanyan, J. Pierce, Avraham Klein, P. Coltharp, J. Shaw, Michael Wood, J. D. Kellie, M. Guillo, D. Doughty, P. Dragovitsch, Sylvain Bouchigny, Roy Thompson, P. Corvisiero, E. De Sanctis, P. Rossi, J. T. Goetz, D. Protopopescu, G. E. Dodge, E. Polli, D. I. Sober, D. Heddle, R. DeVita, S. Niccolai, Federico Ronchetti, D. G. Ireland, J. Hardie, V. Sapunenko, Dinko Pocanic, K. S. Egiyan, D. Branford, D. G. Crabb, S. Pozdniakov, M. Garçon, J. W C McNabb, W. Kim, M. M. Ito, P. V. Degtyarenko, K. Kim, R. S. Hakobyan, K. Mikhailov, V. S. Serov, G. Niculescu, J. R. Calarco, J. Hu, S. E. Kuhn, M. Mirazita, G. Ricco, S. A. Morrow, J. M. Laget, J. H. Kelley, C. Tur, A. Shafi, L. Farhi, G. S. Mutchler, I. Niculescu, C. Djalali, D. Lawrence, Elton Smith, V. Frolov, M. Battaglieri, K. Park, P. Nadel-Turonski, M. Anghinolfi, P. Eugenio, I. Hleiqawi, James Mueller, R. J. Feuerbach, S. L. Careccia, M. Taiuti, R. Bradford, K. Lukashin, A. Coleman, A. I. Ostrovidov, Friedrich Klein, P. D. Rubin, Y. G. Sharabian, P. Ambrozewicz, S. Simionatto, H. R. Weller, Brian Raue, K. Livingston, Michael Dugger, H. O. Funsten, V. P. Kubarovsky, K. L. Giovanetti, B. Asavapibhop, A. Empl, O. Pogorelko, M. Spraker, Larry Weinstein, G. Rosner, R. Nasseripour, C. Marchand, Volker D. Burkert, A. S. Biselli, Alexei V. Klimenko, M. D. Mestayer, L. C. Smith, S. J. Gaff, Bernhard Mecking, B. S. Ishkhanov, Michael L. Williams, K. V. Dharmawardane, Inna Aznauryan, B. E. Stokes, Y. Prok, B. B. Niczyporuk, G. S. Adams, Laird Kramer, Barry Ritchie, S. Boiarinov, N. Pivnyuk, J. Napolitano, G. Riccardi, N. Guler, N. Baillie, C. Butuceanu, G. A. Peterson, Valeria Muccifora, Gerard Gilfoyle, P. L. Cole, J. Langheinrich, C. Cetina, Michael Vineyard, A. V. Skabelin, S. S. Stepanyan, S. A. Philips, B. M. Preedom, S. Barrow, R. C. Minehart, C. A. Meyer, G. V. Fedotov, Lorenzo Zana, J. P. Santoro, B. L. Berman, M. Guidal, L. M. Qin, A. Tkabladze, Y. Ilieva, D. P. Weygand, H. S. Jo, Gerald Feldman, M. Holtrop, M. Klusman, K. Wang, C. Salgado, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Nozar, Nicola Bianchi, R. W. Gothe, K. Y. Kim, U. Thoma, F. W. Hersman, S. McAleer, F. X. Girod, J. W. Price, G. V. O'Rielly, D. G. Jenkins, K. Sabourov, L. C. Dennis, and B. E. Bonner
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Roper resonance, 010308 nuclear & particles physics, Structure function, Sigma, Electron, Polarization (waves), 01 natural sciences, Pion, Amplitude, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Beam energy
Abstract: The polarized longitudinal-transverse structure function {sigma}{sub LT{sup '}} measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and nonresonant processes. We report new measurements of {sigma}{sub LT{sup '}} in the N(1440)(1/2){sup +} (Roper) resonance region at Q{sup 2}=0.40 and 0.65GeV{sup 2} for both the {pi}{sup 0}p and {pi}{sup +}n channels. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at a beam energy of 1.515 GeV. Complete angular distributions were obtained and are compared to recent phenomenological models. The {sigma}{sub LT{sup '}}({pi}{sup +}n) channel shows a large sensitivity to the Roper-resonance multipoles M{sub 1-} and S{sub 1-} and provides new constraints on models of resonance formation.
Published: 2005

38. Electron Scattering From High-Momentum Neutrons in Deuterium

Author: J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Latifa Elouadrhiri, Shifeng Chen, R. C. Minehart, C. A. Meyer, N. A. Baltzell, B. B. Niczyporuk, Michael Wood, G. V. Fedotov, M. Battaglieri, V. S. Serov, N. Pivnyuk, K. A. Griffioen, R. Fatemi, J. R. Calarco, J. Napolitano, P. Corvisiero, A. Tkabladze, S. Bültmann, R. Bradford, L. C. Dennis, A. V. Vlassov, H. Avakian, D. P. Weygand, G. E. Dodge, S. A. Morrow, J. T. Goetz, Federico Ronchetti, J. Kuhn, P. V. Degtyarenko, W. Kim, J. P. Santoro, E. Pasyuk, S. A. Dytman, Cynthia Marie Hadjidakis, G. Niculescu, P. Ambrozewicz, Alexei V. Klimenko, K. S. Egiyan, K. Park, Chaden Djalali, V. P. Kubarovsky, O. Pogorelko, Michael Dugger, H. O. Funsten, P. Coltharp, I. Niculescu, Barry Ritchie, K. Mikhailov, Elton Smith, D. Lawrence, G. Ricco, A. Cazes, Bernhard Mecking, M. Bektasoglu, K. V. Dharmawardane, J. P. Cummings, M. M. Ito, Sylvain Bouchigny, G. S. Mutchler, P. Rossi, M. Anghinolfi, G. Rosner, R. A. Schumacher, James Mueller, H. Denizli, R. Nasseripour, P. Eugenio, S. Niccolai, M. Kossov, M. Taiuti, Friedrich Klein, C. I O Gordon, Brian Raue, P. Stoler, Y. G. Sharabian, G. Riccardi, S. Mehrabyan, R. DeVita, J. W C McNabb, L. Morand, S. Stepanyan, A. V. Skabelin, M. Bellis, J. Hardie, K. Hicks, M. Guillo, J. Pierce, G. Gavalian, Avraham Klein, V. Sapunenko, Dinko Pocanic, H. G. Juengst, E. De Sanctis, M. Osipenko, J. J. Melone, S. Tkachenko, N. Benmouna, M. Ripani, D. I. Sober, S. E. Kuhn, A.V. Stavinsky, C. Tur, D. J. Tedeschi, L. C. Smith, I. Bedlinskiy, W. K. Brooks, B. S. Ishkhanov, C. Butuceanu, B. E. Stokes, G. S. Adams, U. Thoma, K. Joo, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, N. Dashyan, J. D. Kellie, R. G. Fersch, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, J. Lachniet, R. S. Hakobyan, J. Langheinrich, S. S. Stepanyan, Daniel S. Carman, C. E. Hyde-Wright, Sergey Kuleshov, M. Nozar, M. Guidal, M. Holtrop, Victor Mokeev, L. Guo, M. Ungaro, D. Cords, A. Yegneswaran, V. Gyurjyan, J. Zhang, H. Bagdasaryan, D. Doughty, G. V. O'Rielly, D. G. Jenkins, S. McAleer, R. W. Gothe, F. X. Girod, I. Hleiqawi, S. L. Careccia, B. Zhao, K. L. Giovanetti, Atilla Gonenc, Larry Weinstein, F. W. Hersman, J. W. Price, M. Khandaker, N. Baillie, Y. Ilieva, Gerard Gilfoyle, S. Strauch, K. Livingston, H. Egiyan, R. A. Miskimen, B. McKinnon, N. Guler, S. Barrow, D. Branford, L. Todor, D. Protopopescu, M. Mirazita, J. M. Laget, S. Pozdniakov, M. Garçon, A. I. Ostrovidov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, R. J. Feuerbach, Laird Kramer, V. Batourine, F. Sabatié, C. Paterson, Michael Vineyard, Ji Li, M. D. Mestayer, Michael L. Williams, S. Boiarinov, B. M. Preedom, Lorenzo Zana, H. S. Jo, C. Salgado, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Klimenko, AV, Kuhn, SE, Butuceanu, C, Egiyan, KS, Griffioen, KA, Adams, G, Ambrozewicz, P, Anghinolfi, M, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, JP, Baltzell, NA, Barrow, S, Batourine, V, Battaglieri, M, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, AS, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, WK, Bultmann, S, Burkert, VD, Calarco, JR, Careccia, SL, Carman, DS, Cazes, A, Chen, S, Cole, PL, Coltharp, P, Cords, D, Corvisiero, P, Crabb, D, Cummings, JP, Dashyan, NB, DeVita, R, Sanctis, ED, Degtyarenko, PV, Denizli, H, Dennis, L, Dharmawardane, KV, Djalali, C, Dodge, GE, Donnelly, J, Doughty, D, Dugger, M, Dytman, S, Dzyubak, OP, Egiyan, H, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Fersch, RG, Feuerbach, RJ, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gonenc, A, Gordon, CIO, Gothe, RW, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hakobyan, RS, Hardie, J, Hersman, FW, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde-Wright, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Ito, MM, Jenkins, D, Jo, HS, Joo, K, Juengst, HG, Kellie, JD, Khandaker, M, Kim, W, Klein, A, Klein, FJ, Kossov, M, Kramer, LH, Kubarovsky, V, Kuhn, J, Kuleshov, SV, Lachniet, J, Laget, JM, Langheinrich, J, Lawrence, D, Li, J, Livingston, K, McAleer, S, McKinnon, B, McNabb, JWC, Mecking, BA, Mehrabyan, S, Melone, JJ, Mestayer, MD, Meyer, CA, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, M, Miskimen, R, Mokeev, V, Morand, L, Morrow, SA, Mueller, J, Mutchler, GS, Nadel-Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, BB, Niyazov, RA, Nozar, M, O'Rielly, GV, Osipenko, M, Ostrovidov, AI, Park, K, Pasyuk, E, Paterson, C, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Pozdniakov, S, Preedom, BM, Price, JW, Prok, Y, Protopopescu, D, Raue, BA, Riccardi, G, Ricco, G, Ripani, M, Ritchie, BG, Ronchetti, F, Rosner, G, Rossi, P, Sabatie, F, Salgado, C, Santoro, JP, Sapunenko, V, Schumacher, RA, Serov, VS, Sharabian, YG, Skabelin, AV, Smith, ES, Smith, LC, Sober, DI, Stavinsky, A, Stepanyan, SS, Stepanyan, S, Stokes, BE, Stoler, P, Strauch, S, Taiuti, M, Tedeschi, DJ, Thoma, U, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, MF, Vlassov, AV, Weinstein, LB, Weygand, DP, Williams, M, Wolin, E, Wood, MH, Yegneswaran, A, Zana, L, Zhang, J, Zhao, B, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, and Bektaşoğlu, Mehmet
Subjects: Nuclear reaction, Nuclear and High Energy Physics, 24.85.+p, 25.30.-c, 21.45.+v, Proton, Hadron, Nuclear Theory, FOS: Physical sciences, off-shell, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, 01 natural sciences, FINAL-STATE INTERACTION, NUCLEI, PROTON, TARGETS, DEPENDENCE, RATIO, IRON, DIS, FIT, FINAL-STATE INTERACTION, Nuclear physics, RATIO, neutron, TARGETS, DEPENDENCE, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, deuterium, Physics, DIS, NUCLEI, 010308 nuclear & particles physics, IRON, Momentum transfer, FIT, Deuterium, structure functions, Atomic physics, Nucleon, Lepton
Abstract: We report results from an experiment measuring the semi-inclusive reaction $d(e,e'p_s)$ where the proton $p_s$ is moving at a large angle relative to the momentum transfer. If we assume that the proton was a spectator to the reaction taking place on the neutron in deuterium, the initial state of that neutron can be inferred. This method, known as spectator tagging, can be used to study electron scattering from high-momentum (off-shell) neutrons in deuterium. The data were taken with a 5.765 GeV electron beam on a deuterium target in Jefferson Laboratory's Hall B, using the CLAS detector. A reduced cross section was extracted for different values of final-state missing mass $W^{*}$, backward proton momentum $\vec{p}_{s}$ and momentum transfer $Q^{2}$. The data are compared to a simple PWIA spectator model. A strong enhancement in the data observed at transverse kinematics is not reproduced by the PWIA model. This enhancement can likely be associated with the contribution of final state interactions (FSI) that were not incorporated into the model. A ``bound neutron structure function'' $F_{2n}^{eff}$ was extracted as a function of $W^{*}$ and the scaling variable $x^{*}$ at extreme backward kinematics, where effects of FSI appear to be smaller. For $p_{s}>400$ MeV/c, where the neutron is far off-shell, the model overestimates the value of $F_{2n}^{eff}$ in the region of $x^{*}$ between 0.25 and 0.6. A modification of the bound neutron structure function is one of possible effects that can cause the observed deviation., 33 pages RevTeX, 9 figures, to be submitted to Phys. Rev. C. Fixed 1 Reference
Published: 2005

39. Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

Author: D. Doughty, G. Ricco, C. Bennhold, Hall Crannell, D. Heddle, K. S. Egiyan, K. Mikhailov, C. Marchand, Shifeng Chen, R. Fatemi, J. Zhang, Gerard Gilfoyle, Marco A. Huertas, A. V. Vlassov, T. Lee, A.V. Stavinsky, Mokeev, R. A. Miskimen, B. McKinnon, M. Guidal, G. Niculescu, B. L. Berman, L. M. Qin, H. Bagdasaryan, J. W. Price, R. A. Schumacher, J. P. Cummings, J. T. Goetz, E. Polli, D. Branford, M. Mirazita, J. M. Laget, Cynthia Marie Hadjidakis, C. Paterson, Brian Raue, Chaden Djalali, Michael Dugger, D. J. Tedeschi, M. Holtrop, S. Strauch, H. Egiyan, L. Guo, M. Ungaro, M. Klusman, R. C. Minehart, J. Lachniet, A. Tkabladze, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, K. Park, L. C. Smith, M. Nozar, T. A. Forest, M. Khandaker, D. Rowntree, S. Stepanyan, Dinko Pocanic, N. Baillie, C. A. Meyer, Calarco, G. V. Fedotov, Sylvain Bouchigny, D. G. Ireland, J. Pierce, M. Kossov, B. S. Ishkhanov, S. E. Kuhn, G. E. Dodge, A. Fix, R. S. Hakobyan, P. Stoler, P. Rossi, I. Bedlinskiy, Daniel S. Carman, S. McAleer, B. Carnahan, F. Sabatié, I. Hleiqawi, K. Joo, Volker D. Burkert, A. S. Biselli, F. X. Girod, G. Audit, Andreas Klein, C. E. Hyde-Wright, S. L. Careccia, Rakhsha Nasseripour, Stephen Taylor, J. Yun, D. P. Weygand, D. Cords, P. V. Degtyarenko, K. Kim, S. S. Stepanyan, A. Yegneswaran, K. Hicks, Elton Smith, K. L. Giovanetti, B. Asavapibhop, H. Denizli, M. Bektasoglu, Larry Weinstein, G. Gavalian, I. Niculescu, D. Lawrence, S. Tkachenko, M. Anghinolfi, Clarisse Tur, P. Nadel-Turonski, Y. Ilieva, James Mueller, N. Benmouna, M. Ripani, E. De Sanctis, Carlos A. Salgado, Laird Kramer, Tsutomu Mibe, R. Suleiman, J. Langheinrich, S. Bültmann, S. A. Philips, Muccifora, Y. G. Sharabian, Federico Ronchetti, A. V. Skabelin, D. I. Sober, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, Alexei V. Klimenko, P. Dragovitsch, Gyurjyan, W. Kim, P. Coltharp, F. W. Hersman, Barry Ritchie, S. Niccolai, P. Corvisiero, M. M. Ito, Batourine, J. Hardie, G. V. O'Rielly, D. G. Jenkins, R. W. Gothe, Kwangsoo Kim, A. Coleman, M. Osipenko, K. Beard, Winston Roberts, Kalvir S. Dhuga, U. Thoma, C. Butuceanu, Jens H. Kuhn, G. Riccardi, L. Elouadrhiri, R. DeVita, J. W C McNabb, Bernhard Mecking, L. Todor, K. V. Dharmawardane, D. Protopopescu, S. A. Morrow, P. Rubin, A. Deur, S. Pozdniakov, M. Bellis, P. L. Cole, W. K. Brooks, A. Shafi, P. Ambrozewicz, H. Juengst, J. Hu, E. Wolin, K. Livingston, M. Battaglieri, J. P. Ball, R. Bradford, Y. Prok, B. B. Niczyporuk, D. G. Crabb, N. Guler, Sapunenko, N. Pivnyuk, K. Lukashin, J. Napolitano, S. Barrow, Michael Vineyard, J. J. Manak, Michael L. Williams, S. Boiarinov, B. M. Preedom, P. Eugenio, M. Taiuti, Lorenzo Zana, H. S. Jo, Gerald Feldman, K. Wang, J. P. Santoro, Roy Thompson, G. Rosner, B. E. Stokes, G. S. Adams, G. S. Mutchler, N. A. Baltzell, K. A. Griffioen, Mestayer, J. D. Kellie, Frank Klein, J. Shaw, Strakovsky, Michael Wood, V. S. Serov, L. C. Dennis, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, A. Empl, O. Pogorelko, Kubarovsky, R. J. Feuerbach, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Particle physics, Photon, Proton, General Physics and Astronomy, FOS: Physical sciences, 13.60.-r, 13.60.Le, 13.88.+e, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, Phenomenological model, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Bremsstrahlung, Helicity, 3. Good health, Pair production, Nucleon
Abstract: Beam-helicity asymmetries for the two-pion-photoproduction reaction gamma + p --> p pi+ pi- have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these models currently do not provide an adequate description for the behavior of this new observable., 6 pages, 4 figures, submitted to Physical Review Letters
Published: 2005

40. Radiative decays of theΣ0(1385)andΛ(1520)hyperons

Author: P. Dragovitsch, G. Gavalian, R. DeVita, M. Guidal, N. Benmouna, M. Ripani, S. Niccolai, J. W C McNabb, Hall Crannell, M. Holtrop, E. Anciant, Alexei V. Klimenko, J. Hardie, S. Strauch, C. Marchand, J. P. Cummings, M. Kossov, Rakhsha Nasseripour, R. A. Miskimen, H. G. Juengst, S. A. Morrow, R. Fatemi, Federico Ronchetti, M. Khandaker, Barry Ritchie, D. Branford, R. A. Schumacher, C. Djalali, A. V. Vlassov, Ji Li, T. Lee, Daniel S. Carman, Cynthia Marie Hadjidakis, Marco A. Huertas, M. Mirazita, J. M. Laget, A.V. Stavinsky, M. Bellis, C. I O Gordon, G. Audit, G. Ricco, Michael Dugger, P. Ambrozewicz, C. E. Hyde-Wright, M. D. Mestayer, G. Asryan, H. O. Funsten, D. J. Tedeschi, K. Livingston, L. Morand, T. A. Forest, C. S. Whisnant, Michael L. Williams, I. Hleiqawi, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, V. Sapunenko, A. C S Lima, S. Boiarinov, S. Stepanyan, Avraham Klein, Sylvain Bouchigny, B. M. Preedom, S. Simionatto, G. V. O'Rielly, J. Hu, Dinko Pocanic, P. Corvisiero, M. Bektasoglu, D. G. Ireland, M. Nozar, P. Rossi, B. B. Niczyporuk, J. J. Manak, L. C. Smith, Lorenzo Zana, J. P. Santoro, J. Kuhn, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, H. Denizli, G. E. Dodge, D. G. Jenkins, M. Spraker, Larry Weinstein, B. S. Raue, N. Pivnyuk, Volker D. Burkert, A. S. Biselli, D. Doughty, J. Napolitano, R. J. Feuerbach, Gerald Feldman, M. Battaglieri, R. G. Fersch, K. Wang, S. E. Kuhn, P. Stoler, J. Langheinrich, P. V. Degtyarenko, K. Kim, D. Heddle, C. Salgado, S. McAleer, Laird Kramer, B. L. Berman, L. M. Qin, Hovanes Egiyan, Roy Thompson, S. S. Stepanyan, S. A. Philips, J. Lachniet, R. Bradford, K. Lukashin, I. Niculescu, D. Rowntree, A. V. Skabelin, C. Tur, Stephen Taylor, K. Hicks, N. Guler, D. Lawrence, K. S. Egiyan, E. De Sanctis, V. Gyurjyan, M. Klusman, V. Koubarovski, Michael Vineyard, Valeria Muccifora, R. S. Hakobyan, K. Mikhailov, L. Todor, Shifeng Chen, J. W. Price, J. R. Calarco, H. Bagdasaryan, V. Batourine, D. I. Sober, B. Carnahan, L. Guo, M. Ungaro, Gerard Gilfoyle, P. L. Cole, S. Barrow, P. Eugenio, Bernhard Mecking, E. Polli, K. V. Dharmawardane, M. Taiuti, Elton Smith, J. Yun, D. Cords, H. R. Weller, M. Anghinolfi, A. Yegneswaran, G. Rosner, James Mueller, P. D. Rubin, Y. G. Sharabian, C. A. Meyer, Y. Ilieva, J. J. Melone, A. Tkabladze, D. P. Weygand, Nicola Bianchi, M. M. Ito, K. A. Griffioen, D. Protopopescu, S. Pozdniakov, M. Garçon, A. Shafi, B. E. Stokes, G. S. Adams, J. D. Kellie, K. Joo, R. Suleiman, G. S. Mutchler, M. Guillo, E. Golovatch, L. Elouadrhiri, I. I. Strakovsky, A. Deur, W. K. Brooks, M. Osipenko, F. Sabatié, K. Beard, W. Kim, G. Niculescu, F. W. Hersman, R. W. Gothe, K. Y. Kim, U. Thoma, V. Mokeev, S. Bültmann, E. Wolin, J. P. Ball, Y. Prok, D. G. Crabb, G. Riccardi, C. Butuceanu, K. Park, A. Empl, O. Pogorelko, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Shaw, Michael Wood, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Lambda, Lambda baryon, 01 natural sciences, Particle identification, Sigma baryon, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: The electromagnetic decays of the Sig0(1385) and Lambda(1520) hyperons were studied in photon-induced reactions gamma p -> K+ Lambda(1116)gamma in the CLAS detector at the Thomas Jefferson National Accelerator Facility. We report the first observation of the radiative decay of the Sig0(1385) and a measurement of the Lambda(1520) radiative decay width. For the Sig0(1385) -> Lambda(1116)gamma transition, we measured a partial width of 479+/-120(stat)+81-100(sys) keV, larger than all of the existing model predictions. For the Lambda(1520) -> Lambda(1116)gamma transition, we obtained a partial width of 167+/-43(stat)+26-12(sys) keV.
Published: 2005

41. Exclusive photoproduction of the cascade ($\Xi$) hyperons

Author: Alexei V. Klimenko, R. J. Feuerbach, D. Doughty, L. Elouadrhiri, Barry Ritchie, D. Heddle, Laird Kramer, K. Park, G. Rosner, L. C. Smith, S. J. Gaff, G. Ricco, I. I. Strakovsky, David Jenkins, R. Fatemi, A. V. Vlassov, Shifeng Chen, F. W. Hersman, E. Wolin, J. Kuhn, V. P. Kubarovsky, Hovanes Egiyan, Hall Crannell, A. Empl, K. Livingston, O. Pogorelko, P. Stoler, W. K. Brooks, R. W. Gothe, Roy Thompson, J. J. Melone, Friedrich Klein, L. C. Dennis, K. Y. Kim, H. Denizli, U. Thoma, H. Avakian, Brian Raue, C. Marchand, M. Osipenko, B. M. Preedom, V. Sapunenko, Valeria Muccifora, Sylvain Bouchigny, J. P. Ball, Y. Prok, M. Eckhause, J. J. Manak, Y. Kuang, M. Sanzone-Arenhovel, S. O. Nelson, Susan Taylor, K. Hicks, G. V. O'Rielly, J. Connelly, A. V. Skabelin, Gerard Gilfoyle, B. B. Niczyporuk, E. Anciant, W. J. Briscoe, E. Pasyuk, J. T. Goetz, K. S. Egiyan, K. Beard, J. P. Santoro, E. Polli, P. Eugenio, M. Taiuti, N. Pivnyuk, J. Napolitano, R. A. Miskimen, H. G. Juengst, D. G. Crabb, G. S. Mutchler, N. Guler, S. A. Dytman, G. E. Dodge, M. Khandaker, P. V. Degtyarenko, K. Kim, K. Sabourov, J. P. Cummings, C. A. Meyer, A.V. Stavinsky, P. Rossi, G. A. Peterson, Elton Smith, K. Mikhailov, W. Major, W. Kim, S. McAleer, M. Kossov, I. Niculescu, V. Gyurjyan, D. Lawrence, G. Niculescu, B. E. Stokes, G. S. Adams, Federico Ronchetti, D. Branford, M. Mirazita, J. M. Laget, K. Wang, C. Salgado, A. Tkabladze, P. L. Cole, J. Lachniet, B. M. K. Nefkens, D. Rowntree, V. Frolov, K. Joo, S. Barrow, D. J. Tedeschi, S. Strauch, Rakhsha Nasseripour, D. P. Weygand, M. Anghinolfi, D. G. Ireland, M. Guillo, R. A. Schumacher, James Mueller, J. Shaw, Michael Wood, L. Farhi, P. D. Rubin, M. M. Ito, J. R. Calarco, J. W. Price, G. Riccardi, I. Hleiqawi, S. Simionatto, Y. G. Sharabian, V. S. Serov, R. DeVita, Ji Li, H. Bagdasaryan, C. Butuceanu, J. W C McNabb, M. Bellis, R. S. Hakobyan, Dinko Pocanic, C. I O Gordon, D. Hancock, K. L. Giovanetti, B. Asavapibhop, K. A. Griffioen, D. Protopopescu, A. Coleman, M. D. Mestayer, S. A. Morrow, H. R. Weller, C. Djalali, M. Spraker, Larry Weinstein, S. E. Kuhn, S. Pozdniakov, L. Morand, J. H. Kelley, T. A. Forest, Michael L. Williams, J. Hu, C. Tur, S. Stepanyan, A. Shafi, O. P. Dzyubak, J. L. Ducote, S. Boiarinov, P. Ambrozewicz, J. D. Kellie, John T. O'Brien, Avraham Klein, P. Corvisiero, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, C. Cetina, Y. Ilieva, L. Guo, M. Ungaro, Michael Vineyard, B. Carnahan, L. Todor, F. Sabatié, P. Dragovitsch, M. Battaglieri, Thierry Auger, R. Bradford, K. Lukashin, Nicola Bianchi, R. A. Niyazov, J. Yun, D. Cords, B. L. Berman, L. M. Qin, S. Niccolai, A. Yegneswaran, M. Klusman, J. Hardie, E. De Sanctis, D. I. Sober, A. I. Ostrovidov, Volker D. Burkert, A. S. Biselli, J. Langheinrich, S. A. Philips, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, M. Nozar, M. Guidal, M. Holtrop, Thomas E. Smith, G. Gavalian, N. Benmouna, M. Ripani, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Physics, BARYONS, Nuclear and High Energy Physics, Particle physics, 13.60.Rj, 25.20.Lj, 14.20.Jn, 010308 nuclear & particles physics, Hyperon, FOS: Physical sciences, PENTAQUARKS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle identification, INCLUSIVE PHOTOPRODUCTION, PENTAQUARKS, BARYONS, Cascade, Excited state, 0103 physical sciences, Production (computer science), Nuclear Experiment (nucl-ex), 010306 general physics, Ground state, INCLUSIVE PHOTOPRODUCTION, Nuclear Experiment, Spin-½
Abstract: We report on the first measurement of exclusive Xi-(1321) hyperon photoproduction in gamma p --> K+ K+ Xi- for 3.2 < E(gamma) < 3.9 GeV. The final state is identified by the missing mass in p(gamma,K+ K+)X measured with the CLAS detector at Jefferson Laboratory. We have detected a significant number of the ground-state Xi-(1321)1/2+, and have estimated the total cross section for its production. We have also observed the first excited state Xi-(1530)3/2+. Photoproduction provides a copious source of Xi's. We discuss the possibilities of a search for the recently proposed Xi5-- and Xi5+ pentaquarks., submitted to Phys. Rev. C
Published: 2005

42. Complete measurement of three-body photodisintegration ofHe3for photon energies between 0.35 and1.55GeV

Author: J. P. Ball, Y. Prok, Alexei V. Klimenko, J. R. M. Annand, R. A. Miskimen, H. G. Juengst, L. Guo, M. Ungaro, Barry Ritchie, M. M. Ito, D. Branford, P. Stoler, M. Mirazita, J. M. Laget, A. I. Ostrovidov, A. C S Lima, D. Doughty, A.V. Stavinsky, S. McAleer, Cynthia Marie Hadjidakis, P. Eugenio, K. Joo, A. Coleman, B. B. Niczyporuk, D. G. Crabb, L. C. Smith, D. J. Tedeschi, S. Strauch, N. Pivnyuk, R. A. Schumacher, Marco A. Huertas, R. A. Niyazov, J. Yun, D. Cords, D. Heddle, M. Bellis, J. Napolitano, Dinko Pocanic, Ji Li, M. Guidal, Federico Ronchetti, Michael Dugger, K. Hicks, S. Pozdniakov, Volker D. Burkert, A. S. Biselli, J. P. Cummings, M. Taiuti, S. Stepanyan, Sylvain Bouchigny, K. A. Griffioen, S. E. Kuhn, C. I O Gordon, H. O. Funsten, P. Rossi, J. Hu, G. S. Adams, A. Shafi, J. W. Price, M. D. Mestayer, G. Ricco, M. Holtrop, A. Yegneswaran, D. G. Ireland, H. Denizli, L. Morand, Si Chen, J. R. Calarco, C. Tur, Rolf Ent, R. DeVita, J. W C McNabb, M. Battaglieri, B. L. Berman, T. A. Forest, Michael L. Williams, M. Kossov, S. A. Morrow, C. Djalali, L. M. Qin, P. Heimberg, Andrei Afanasev, I. Popa, K. Livingston, E. De Sanctis, R. Bradford, K. Lukashin, J. D. Kellie, Susan Taylor, P. Ambrozewicz, J. J. Melone, Friedrich Klein, S. Boiarinov, B. M. Preedom, R. J. Feuerbach, L. Y. Murphy, O. P. Dzyubak, Avraham Klein, Brian Raue, Y. Kuang, Daniel S. Carman, V. Gyurjyan, John T. O'Brien, M. Klusman, E. Polli, Laird Kramer, Lorenzo Zana, J. P. Santoro, G. V. O'Rielly, G. Audit, C. E. Hyde-Wright, D. I. Sober, C. S. Whisnant, Elton Smith, J. R. Ficenec, Bernhard Mecking, P. Dragovitsch, K. V. Dharmawardane, Y.Y. Llieva, U. Thoma, N. Guler, D. Protopopescu, H. Bagdasaryan, H. S. Jo, D. G. Jenkins, M. Anghinolfi, Gerald Feldman, Latifa Elouadrhiri, James Mueller, S. Niccolai, Hall Crannell, P. Corvisiero, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, K. Wang, P. D. Rubin, C. Marchand, Y. G. Sharabian, R. C. Minehart, C. Salgado, R. Fatemi, C. A. Meyer, J. Kuhn, G. V. Fedotov, G. Riccardi, B. Carnahan, G. E. Dodge, M. Bektasoglu, C. Armstrong, F. Sabatié, A. V. Vlassov, J. Hardie, M. Guillo, S. Barrow, K. S. Egiyan, P. V. Degtyarenko, K. Kim, M. Khandaker, M. Nozar, C. Butuceanu, I. Niculescu, P. L. Cole, D. Lawrence, Roy Thompson, R. Naseripour, K. Mikhailov, D. P. Weygand, R. Suleiman, A. V. Skabelin, J. Lachniet, J. Langheinrich, G. S. Mutchler, Michael Vineyard, D. Rowntree, L. Todor, S. A. Philips, G. Gavalian, N. Benmouna, M. Ripani, J. J. Manak, R. S. Hakobyan, E. Golovatch, Nicola Bianchi, K. Hleiqawi, G. Rosner, I. I. Strakovsky, W. K. Brooks, M. Osipenko, K. Beard, Kalvir S. Dhuga, L. C. Dennis, B. E. Bonner, W. Kim, G. Niculescu, H. Avakian, W. J. Briscoe, E. Pasyuk, S. A. Dytman, K. Park, A. Empl, O. Pogorelko, F. W. Hersman, J. Shaw, Michael Wood, V. S. Serov, R. W. Gothe, K. Y. Kim, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, Hovanes Egiyan, R. Tkabladze, and E. Wolin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Spectrometer, 010308 nuclear & particles physics, Hadron, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, Momentum, Massless particle, Photodisintegration, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The three-body photodisintegration of 3He has been measured with the CLAS detector at Jefferson Lab, using tagged photons of energies between 0.35 GeV and 1.55 GeV. The large acceptance of the spectrometer allowed us for the first time to cover a wide momentum and angular range for the two outgoing protons. Three kinematic regions dominated by either two- or three-body contributions have been distinguished and analyzed. The measured cross sections have been compared with results of a theoretical model, which, in certain kinematic ranges, have been found to be in reasonable agreement with the data.
Published: 2004

43. 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

44. Survey of A_LT' asymmetries in semi-exclusive electron scattering on He4 and C12

Author: L. Elouadrhiri, J. Kuhn, V. Sapunenko, Valeria Muccifora, Roy Thompson, R. Fatemi, D. Doughty, P. Dragovitsch, M. Battaglieri, Gerard Gilfoyle, D. Heddle, A. V. Vlassov, T. Lee, J. R. Calarco, S. Niccolai, R. Bradford, Y.G. Sharabian, M. Osipenko, F. Sabatié, B. M. Preedom, Shalev Gilad, R. A. Miskimen, J. Hardie, H. G. Juengst, W. K. Brooks, K. Beard, Ji Li, Lorenzo Zana, J. P. Santoro, M. D. Mestayer, G. Ricco, Kalvir S. Dhuga, Michael L. Williams, M. Guidal, S. Boiarinov, A. I. Ostrovidov, E. Wolin, K. Wang, D. Branford, Dimitri Debruyne, C. Salgado, M. M. Ito, G. Gavalian, J. J. Manak, D. G. Ireland, R. C. Minehart, J. P. Ball, S. Stepanyan, M. Mirazita, J. M. Laget, Y. Prok, I. Hleiqawi, S. Simionatto, Volker D. Burkert, A. S. Biselli, G. E. Dodge, C. A. Meyer, D. Protopopescu, M. Holtrop, Bernhard Mecking, A.V. Stavinsky, K. S. Egiyan, P. Eugenio, M. Taiuti, Cynthia Marie Hadjidakis, C. Cetina, K. A. Griffioen, Michael Vineyard, L. Todor, W. Ingram, K. V. Dharmawardane, K. L. Giovanetti, B. Asavapibhop, Friedrich Klein, S. Pozdniakov, P. V. Degtyarenko, A. Tkabladze, Michael Dugger, Brian Raue, D. G. Crabb, M. Spraker, Larry Weinstein, William Bertozzi, E. Anciant, M. Guillo, D. J. Tedeschi, K. Mikhailov, D. P. Weygand, H. O. Funsten, E. De Sanctis, J. D. Kellie, A. Coleman, H. R. Weller, B. Carnahan, I. Niculescu, Sylvain Bouchigny, W. Kim, S. McAleer, G. Niculescu, M. Khandaker, R. J. Feuerbach, D. I. Sober, D. Lawrence, J. J. Melone, Daniel S. Carman, Alexei V. Klimenko, P. Rossi, G. Rosner, Laird Kramer, G. Audit, Thierry Auger, C. E. Hyde-Wright, Barry Ritchie, R. A. Schumacher, L. C. Smith, Susan Taylor, S. Strauch, H. Egiyan, Federico Ronchetti, C. I O Gordon, Kwangsoo Kim, G. Riccardi, J. Hu, G. S. Mutchler, G. Asryan, Nicola Bianchi, C. Butuceanu, S. McLauchlan, B. E. Stokes, G. S. Adams, K. Joo, L. Morand, T. A. Forest, K. Livingston, O. P. Dzyubak, R. A. Niyazov, C. S. Whisnant, B. L. Berman, N. Guler, U. Thoma, Avraham Klein, G. A. Peterson, A. V. Skabelin, M. Bektasoglu, L. M. Qin, F. W. Hersman, P. Corvisiero, P. L. Cole, S. Barrow, M. Nozar, Hall Crannell, M. Klusman, C. Marchand, N. Benmouna, M. Ripani, L. Guo, M. Ungaro, R. DeVita, P. Stoler, J. W C McNabb, J. Langheinrich, S. A. Philips, J. W. Price, S. O. Nelson, K. Hicks, R. W. Gothe, K. Y. Kim, J. Yun, D. Cords, A. Yegneswaran, G. V. O'Rielly, V. Gyurjyan, D. G. Jenkins, K. Sabourov, H. Bagdasaryan, B. B. Niczyporuk, N. Pivnyuk, J. Napolitano, S. A. Morrow, C. Djalali, P. Ambrozewicz, J. Lachniet, Jan Ryckebusch, D. Rowntree, R. S. Hakobyan, Patrick Girard, J. Shaw, Michael Wood, Baile Zhang, V. S. Serov, Shifeng Chen, M. Bellis, K. Park, E. Polli, Elton Smith, A. Empl, O. Pogorelko, M. Anghinolfi, K. Lukashin, L. C. Dennis, B. E. Bonner, James Mueller, H. Avakian, P. D. Rubin, J. P. Cummings, M. Kossov, Dinko Pocanic, W. J. Briscoe, E. Pasyuk, S. A. Dytman, Rakhsha Nasseripour, S. E. Kuhn, J. H. Kelley, C. Tur, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
Subjects: Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, FOS: Physical sciences, Comparisons with model predictions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 4He, single spin azimuthal asymmetries vs missing momentum, 01 natural sciences, NUCLEON EMISSION, missing energy, Nuclear physics, 12C (polarised e, deduced, 0103 physical sciences, e′p), Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Spin-½, Physics, NUCLEAR REACTIONS, POLARIZED ELECTRONS, E'P REACTIONS, 010308 nuclear & particles physics, Scattering, POLARIZED ELECTRONS, NUCLEON EMISSION, E'P REACTIONS, KNOCKOUT, Helicity, Eikonal approximation, KNOCKOUT, 24.70.+s, 25.30.Dh, 27.10.+h, measured, final state interaction effects, High Energy Physics::Experiment, Nucleon, Glauber, Electron scattering, E=2.261, 4.461 GeV
Abstract: Single spin azimuthal asymmetries A_LT' were measured at Jefferson Lab using 2.2 and 4.4 GeV longitudinally polarized electrons incident on He4 and C12 targets in the CLAS detector. A_LT' is related to the imaginary part of the longitudinal-transverse interference and in quasifree nucleon knockout it provides an unambiguous signature for final state interactions (FSI). Experimental values of A_LT' were found to be below 5%, typically |A_LT'| < 3% for data with good statistical precision. Optical Model in Eikonal Approximation (OMEA) and Relativistic Multiple-Scattering Glauber Approximation (RMSGA) calculations are shown to be consistent with the measured asymmetries., 9 pages, 5 figures
Published: 2004

45. Tensor polarization of theϕmeson photoproduced at hight

Author: J. P. Cummings, M. Kossov, J. Langheinrich, M. Bektasoglu, Rakhsha Nasseripour, S. A. Philips, P. Dragovitsch, Jing Zhao, Daniel S. Carman, P. Stoler, M. Osipenko, K. Beard, G. Audit, C. E. Hyde-Wright, J. Lachniet, Dinko Pocanic, S. Niccolai, S. E. Kuhn, L. C. Dennis, S. O. Nelson, K. Hicks, J. H. Kelley, C. Tur, D. Rowntree, B. E. Bonner, Hall Crannell, Susan Taylor, S. McAleer, J. Hardie, G. Gavalian, M. Guillo, J. Kuhn, H. Egiyan, H. Avakian, B. M. Preedom, W. Major, R. S. Hakobyan, O. P. Dzyubak, R. A. Niyazov, C. Marchand, M. Guidal, G. Niculescu, Roy Thompson, R. A. Schumacher, R. A. Miskimen, M. Holtrop, H. G. Juengst, P. Corvisiero, E. Anciant, C. S. Whisnant, J. P. Santoro, C. I O Gordon, G. A. Peterson, D. J. Tedeschi, W. Kim, K. S. Egiyan, F. W. Hersman, E. Pasyuk, S. Barrow, L. Morand, T. A. Forest, M. Mirazita, J. M. Laget, P. Eugenio, M. Taiuti, S. A. Dytman, B. Carnahan, F. Sabatié, M. Khandaker, R. J. Feuerbach, K. Wang, T. Smith, C. Salgado, L. Farhi, Thierry Auger, Volker D. Burkert, A. S. Biselli, U. Thoma, Avraham Klein, G. S. Adams, D. Hancock, G. Ricco, K. Joo, G. E. Dodge, Patrick Girard, B. L. Berman, J. Shaw, V. Gyurjyan, D. Doughty, Nicola Bianchi, Michael Wood, V. Sapunenko, L. M. Qin, Valeria Muccifora, Philip L. Cole, P. V. Degtyarenko, V. S. Serov, Laird Kramer, A. Coleman, D. Heddle, H. R. Weller, C. Cetina, Gerard Gilfoyle, L. Todor, Moshe Gai, M. Klusman, Michael Vineyard, M. Bellis, K. Park, D. Protopopescu, M. Garçon, J. W. Price, I. Niculescu, Z. L. Zhou, H. Bagdasaryan, J. J. Melone, D. Lawrence, Friedrich Klein, R. S. Hicks, Brian Raue, A. Shafi, Ji Li, L. Guo, M. Ungaro, M. D. Mestayer, O. Pogorelko, W. K. Brooks, F. Ronchetti, V. Frolov, S. Boiarinov, J. Yun, D. Cords, K. L. Giovanetti, B. Asavapibhop, M. Spraker, Larry Weinstein, A. Yegneswaran, L. C. Smith, S. J. Gaff, D. G. Jenkins, K. Sabourov, Cynthia Marie Hadjidakis, Michael Dugger, M. Nozar, E. De Sanctis, H. O. Funsten, M. M. Ito, D. I. Sober, A. V. Vlassov, J. J. Manak, S. Mehrabyan, Elton Smith, J. R. Ficenec, M. Anghinolfi, James Mueller, K. McCormick, P. D. Rubin, Y. G. Sharabian, C. Butuceanu, Shifeng Chen, E. Wolin, Y. Kuang, E. Polli, J. P. Ball, Y. Prok, M. Eckhause, M. Sargsyan, Latifa Elouadrhiri, D. G. Crabb, R. C. Minehart, C. A. Meyer, D. P. Weygand, N. Benmouna, M. Ripani, H. Denizli, J. Connelly, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, M. Battaglieri, R. Bradford, K. Lukashin, S. Strauch, J. R. Calarco, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, G. S. Mutchler, K. A. Griffioen, S. Stepanyan, Sylvain Bouchigny, P. Rossi, G. Riccardi, R. DeVita, J. W C McNabb, S. A. Morrow, C. Djalali, Shalev Gilad, P. Ambrozewicz, M. Sanzone-Arenhovel, B. B. Niczyporuk, N. Pivnyuk, and J. Napolitano
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Momentum transfer, Hadron, Quarkonium, Phi meson, 01 natural sciences, Helicity, Nuclear physics, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics
Abstract: As part of a measurement [E. Anciant et al., Phys. Rev. Lett. 85, 4682 (2000)] of the cross section of phi meson photoproduction to high momentum transfer, we measured the polar angular decay distribution of the outgoing K+ in the channel K+K- in the phi center-of-mass frame (the helicity frame). We find that phi s-channel helicity conservation (SCHC) holds in the kinematical range where t-channel exchange dominates (up to -t {approx}2.5 GeV2 for E = 3.6 GeV). Above this momentum, phi u-channel production of a meson dominates and induces a violation of SCHC. The deduced value of the phi NN coupling constant lies in the upper range of previously reported values.
Published: 2004

46. 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

47. Complete Angular Distribution Measurements of Two-Body Deuteron Photodisintegration between 0.5 and 3 GeV

Author: Philip L. Cole, Moshe Gai, J. J. Melone, Friedrich Klein, William Bertozzi, P. Stoler, R. S. Hicks, Brian Raue, K. Hicks, E. Anciant, J. W C McNabb, B. M. Preedom, K. S. Egiyan, L. Todor, D. Protopopescu, I. I. Strakovsky, G. Gavalian, S. Pozdniakov, K. Mikhailov, L.C. Dennis, Z. L. Zhou, B. L. Berman, Y. Ilieva, Nicola Bianchi, J. P. Santoro, M. M. Ito, J. Shaw, J. Kuhn, V. Mokeev, L. M. Qin, J. P. Cummings, Alexei V. Klimenko, A.V. Stavinsky, K. Livingston, B. B. Niczyporuk, Michael Wood, Roy Thompson, M. Khandaker, L. C. Smith, A. V. Skabelin, R. A. Schumacher, G. A. Peterson, W. K. Brooks, G. S. Mutchler, N. Pivnyuk, J. R. Calarco, J. Napolitano, Bernhard Mecking, S. Barrow, Susan Taylor, R. A. Miskimen, V. S. Serov, O. P. Dzyubak, M. Kossov, K. Wang, K. V. Dharmawardane, John T. O'Brien, Barry Ritchie, D. J. Tedeschi, S. A. Morrow, C. Salgado, C. Djalali, M. Klusman, D. Branford, H. Egiyan, Rakhsha Nasseripour, F. Ronchetti, B. E. Bonner, Shalev Gilad, S. McAleer, J. S. McCarthy, M. Mirazita, P. Ambrozewicz, J. M. Laget, P. Eugenio, P. Corvisiero, C. I O Gordon, Elton Smith, M. Taiuti, H. Avakian, S. A. Philips, J. R. Ficenec, K. A. Griffioen, S. Simionatto, C. S. Whisnant, W. Kim, L. Morand, T. A. Forest, M. Anghinolfi, E. De Sanctis, H. Denizli, M. Battaglieri, V. Gyurjyan, H. R. Weller, James Mueller, A. I. Ostrovidov, A. C S Lima, K. L. Giovanetti, B. Asavapibhop, D. I. Sober, B. Carnahan, P. D. Rubin, M. Spraker, Larry Weinstein, Avraham Klein, Airton Deppman, Y. G. Sharabian, R. Bradford, R. J. Feuerbach, P. Dragovitsch, Michael Vineyard, D. Doughty, J. W. Price, Baile Zhang, Latifa Elouadrhiri, M. Guidal, J. Lachniet, S. Niccolai, W. J. Briscoe, S. Strauch, G. Niculescu, D. Heddle, D. Rowntree, Volker D. Burkert, A. S. Biselli, S. Stepanyan, Sylvain Bouchigny, C. A. Meyer, Hall Crannell, Shifeng Chen, V. Sapunenko, Valeria Muccifora, M. Guillo, H. Bagdasaryan, K. Y. Kim, E. Pasyuk, J. Hardie, S. A. Dytman, C. Marchand, A. Tkabladze, R. Fatemi, M. Holtrop, A. V. Vlassov, Gerard Gilfoyle, D. P. Weygand, G. E. Dodge, P. Rossi, Ji Li, R. S. Hakobyan, G. V. O'Rielly, P. V. Degtyarenko, K. Kim, J. Hu, R. De Vita, E. Polli, Daniel S. Carman, D. G. Jenkins, M. Osipenko, I. Niculescu, F. Sabatié, G. Rosner, J. J. Manak, M. D. Mestayer, D. Lawrence, Dinko Pocanic, G. Audit, C. E. Hyde-Wright, M. Bellis, K. Park, K. Beard, Kalvir S. Dhuga, M. Bektasoglu, M. Nozar, Laird Kramer, L. Guo, M. Ungaro, S. Boiarinov, S. E. Kuhn, A. Empl, O. Pogorelko, R. A. Niyazov, J. Yun, D. Cords, A. Yegneswaran, K. Lukashin, B. E. Stokes, F. W. Hersman, G. S. Adams, C. Tur, K. Joo, U. Thoma, E. Wolin, Cynthia Marie Hadjidakis, J. P. Ball, Y. Prok, Michael Dugger, H. O. Funsten, D. G. Crabb, N. Benmouna, M. Ripani, J. D. Kellie, S. Mehrabyan, G. Riccardi, C. Butuceanu, G. Ricco, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Photon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, FOS: Physical sciences, Few-body systems, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, QC, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, Gluon, High Energy Physics - Phenomenology, Cover (topology), Photodisintegration, Physics::Accelerator Physics, High Energy Physics::Experiment, Energy (signal processing)
Abstract: Nearly complete angular distributions of the two-body deuteron photodisintegration differential cross section have been measured using the CLAS detector and the tagged photon beam at JLab. The data cover photon energies between 0.5 and 3.0 GeV and center-of-mass proton scattering angles 10-160 degrees. The data show a persistent forward-backward angle asymmetry over the explored energy range, and are well-described by the non-perturbative Quark Gluon String Model., Comment: Submitted to PRC; 14 pages, 9 figures, 2 tables
Published: 2004
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48. 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

49. Measurement of the polarized structure functionσLT′forp(e→,e′p)π0in theΔ(1232)resonance region

Author: Susan Taylor, W. Kim, J. Kuhn, C. S. Whisnant, D. I. Sober, Laird Kramer, Roy Thompson, Daniel S. Carman, H. Denizli, R. J. Feuerbach, G. Audit, C. E. Hyde-Wright, P. Eugenio, M. Taiuti, S. Strauch, J. Hu, S. McAleer, G. A. Peterson, Cynthia Marie Hadjidakis, L. C. Dennis, M. Nozar, Dinko Pocanic, H. Avakian, Michael Dugger, L. Guo, S. Barrow, M. Guidal, Alexei V. Klimenko, H. O. Funsten, R. Fatemi, M. Ungaro, S. E. Kuhn, G. Niculescu, E. Anciant, A. V. Vlassov, M. Osipenko, A. C S Lima, L. M. Qin, W. J. Briscoe, E. Pasyuk, M. Holtrop, J. H. Kelley, C. Tur, L. Y. Murphy, K. Beard, S. A. Dytman, G. Ricco, Barry Ritchie, Kalvir S. Dhuga, P. Dragovitsch, Volker D. Burkert, A. S. Biselli, J. P. Cummings, L. Todor, Jing Zhao, G. Gavalian, M. Klusman, M. Bektasoglu, J. W. Price, Philip L. Cole, D. Protopopescu, S. Niccolai, Elton Smith, E. Wolin, S. Pozdniakov, M. Kossov, M. Anghinolfi, S. A. Philips, J. Hardie, J. J. Melone, Friedrich Klein, Z. L. Zhou, Rakhsha Nasseripour, James Mueller, K. Y. Kim, M. Khandaker, R. S. Hicks, Brian Raue, P. D. Rubin, N. Benmouna, M. Guillo, M. Ripani, Y. G. Sharabian, J. P. Ball, Y. Prok, M. Eckhause, O. P. Dzyubak, R. A. Niyazov, A.V. Stavinsky, J. J. Manak, G. V. O'Rielly, A. K. Opper, Hovanes Egiyan, B. Carnahan, D. J. Tedeschi, F. Sabatié, Hall Crannell, D. G. Jenkins, A. V. Skabelin, Y. Kuang, M. Sargsyan, Y. Ilieva, K. Sabourov, Thierry Auger, G. S. Mutchler, J. Ficenec, E. Polli, L. Ciciani, F. W. Hersman, K. Joo, Federico Ronchetti, R. C. Minehart, C. A. Meyer, S. Simionatto, J. Yun, P. Corvisiero, D. Cords, D. G. Crabb, C. Cetina, L. Elouadrhiri, A. Yegneswaran, V. Sapunenko, Valeria Muccifora, Michael Vineyard, I. I. Strakovsky, K. L. Giovanetti, B. Asavapibhop, K. S. Egiyan, W. K. Brooks, M. Spraker, Larry Weinstein, E. DeSanctis, D. Doughty, Gerard Gilfoyle, K. Mikhailov, D. Heddle, V. Gyurjyan, S. Mehrabyan, H. Bagdasaryan, Nicola Bianchi, R. A. Miskimen, D. P. Weygand, Ji Li, Shalev Gilad, G. Riccardi, G. E. Dodge, P. Stoler, D. Branford, M. Mirazita, J. M. Laget, C. Butuceanu, S. O. Nelson, K. Hicks, M. D. Mestayer, P. V. Degtyarenko, K. Kim, S. Boiarinov, G. S. Adams, B. M. Preedom, R. DeVita, K. A. Griffioen, J. W C McNabb, U. Thoma, I. Niculescu, J. Lachniet, D. Rowntree, D. Lawrence, J. P. Santoro, P. Heimberg, R. S. Hakobyan, R. A. Schumacher, K. Wang, C. Salgado, C. I O Gordon, L. Morand, B. B. Niczyporuk, T. A. Forest, S. Stepanyan, N. Pivnyuk, K. Lukashin, J. Napolitano, Avraham Klein, S. A. Morrow, C. Djalali, P. Ambrozewicz, M. Battaglieri, R. Bradford, M. U. Mozer, Bernhard Mecking, K. V. Dharmawardane, M. M. Ito, A. Coleman, H. R. Weller, L. C. Smith, S. J. Gaff, C. Marchand, Patrick Girard, J. Shaw, Michael Wood, Sylvain Bouchigny, V. S. Serov, P. Rossi, M. Bellis, K. Park, J. R. Calarco, A. Empl, and O. Pogorelko
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Pion, Nuclear magnetic resonance, Structure function, Pole term, Isobar, Resonance, Electron, Nuclear Experiment, Energy (signal processing)
Abstract: The polarized longitudinal-transverse structure function ${\ensuremath{\sigma}}_{L{T}^{\ensuremath{'}}}$ has been measured using the $p(\stackrel{P\vec}{e},{e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+})n$ reaction in the $\ensuremath{\Delta}(1232)$ resonance region at ${Q}^{2}=0.40$ and $0.65\phantom{\rule{0.3em}{0ex}}{\mathrm{GeV}}^{2}$. No previous ${\ensuremath{\sigma}}_{L{T}^{\ensuremath{'}}}$ data exist for this reaction channel. The kinematically complete experiment was performed at the Jefferson Lab with the CEBAF large acceptance spectrometer using longitudinally polarized electrons at an energy of $1.515\phantom{\rule{0.3em}{0ex}}\mathrm{GeV}$. A partial-wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured ${\ensuremath{\pi}}^{0}p$ channel. A fit to both ${\ensuremath{\pi}}^{0}p$ and ${\ensuremath{\pi}}^{+}n$ channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the nonresonant background. The $t$-channel pion pole term is important in the ${\ensuremath{\pi}}^{0}p$ channel through a rescattering correction, which could be model dependent.
Published: 2003

50. Observation of nuclear scaling in theA(e,e′)reaction atxB>1

Author: K. Mikhailov, P. Eugenio, R. J. Feuerbach, M. Taiuti, A. Weisberg, Patrick Girard, J. Shaw, Michael Wood, V. S. Serov, Laird Kramer, R. A. Schumacher, A. Coleman, G. Asryan, K. A. Griffioen, M. U. Mozer, O. P. Dzyubak, R. A. Niyazov, L. C. Dennis, B. E. Bonner, Bernhard Mecking, P. Corvisiero, K. V. Dharmawardane, H. Avakian, P. Stoler, S. O. Nelson, K. Hicks, P. Heimberg, C. I O Gordon, W. J. Briscoe, Susan Taylor, Jing Zhao, E. Pasyuk, S. A. Dytman, A.V. Stavinsky, M. Guidal, L. C. Maximon, M. Battaglieri, Volker D. Burkert, A. S. Biselli, L. Morand, T. A. Forest, M. Guillo, H. Denizli, C. S. Whisnant, M. Bektasoglu, J. Kuhn, D. J. Tedeschi, M. Bellis, K. Park, Hovanes Egiyan, G. Niculescu, Daijin Kim, Elton Smith, Shalev Gilad, Avraham Klein, G. V. O'Rielly, Roy Thompson, R. A. Miskimen, R. Bradford, K. Lukashin, J. Lachniet, J. S. McCarthy, G. Ricco, D. Rowntree, A. Empl, O. Pogorelko, I. I. Strakovsky, M. Anghinolfi, J. P. Cummings, E. DeSanctis, D. Branford, D. G. Jenkins, M. Mirazita, K. Sabourov, J. M. Laget, Philip L. Cole, S. Strauch, J. Connelly, M. Holtrop, James Mueller, R. S. Hakobyan, Moshe Gai, Misak Sargsian, Ivan Bedlinski, U. Thoma, J. J. Melone, Friedrich Klein, P. D. Rubin, M. Kossov, V. Sapunenko, W. K. Brooks, Valeria Muccifora, L. M. Qin, Mark Strikman, A. V. Skabelin, P. Dragovitsch, G. S. Mutchler, R. S. Hicks, Brian Raue, G. Riccardi, Latifa Elouadrhiri, Rakhsha Nasseripour, Gerard Gilfoyle, S. McAleer, Y. G. Sharabian, S. Niccolai, J. Hu, M. Klusman, L. Guo, R. DeVita, M. Ungaro, J. Hardie, R. C. Minehart, C. A. Meyer, J. W C McNabb, N. Benmouna, M. Ripani, Dinko Pocanic, Cynthia Marie Hadjidakis, Michael Dugger, B. Carnahan, H. Funsten, J. W. Price, B. B. Niczyporuk, Daniel S. Carman, Thierry Auger, S. E. Kuhn, Alexei V. Klimenko, J. H. Kelley, N. Pivnyuk, K. Sh Egiyan, C. Tur, J. Napolitano, Barry Ritchie, G. Audit, C. E. Hyde-Wright, Baile Zhang, G. Gavalian, J. Yun, D. Cords, M. M. Ito, S. A. Morrow, C. Djalali, L. Todor, A. Yegneswaran, J. R. Calarco, L. C. Smith, R. A. Demirchyan, C. Marchand, F. W. Hersman, Y. Kuang, P. Ambrozewicz, S. Stepanyan, Sylvain Bouchigny, M. Nozar, P. Rossi, D. I. Sober, E. Polli, V. Gyurjyan, R. Fatemi, S. A. Philips, A. V. Vlassov, K. Y. Kim, H. Bagdasaryan, Min Suk Kim, J. J. Manak, H. R. Weller, M. Osipenko, F. Sabatié, K. Beard, Kalvir S. Dhuga, W. Kim, F. Ronchetti, J. Ficenec, L. Ciciani, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, D. Doughty, D. Heddle, E. Anciant, A. K. Opper, M. Khandaker, Y. Ilieva, Nicola Bianchi, Hall Crannell, G. S. Adams, D. Protopopescu, K. Joo, G. E. Dodge, S. Pozdniakov, Z. L. Zhou, P. V. Degtyarenko, K. Kim, D. P. Weygand, Ji Li, I. Niculescu, D. Lawrence, M. D. Mestayer, G. A. Peterson, S. Barrow, S. Boiarinov, B. M. Preedom, J. P. Santoro, E. Wolin, J. P. Ball, Y. Prok, M. Eckhause, D. G. Crabb, M. Spraker, K. Wang, N. Dashyan, C. Salgado, C. Cetina, Michael Vineyard, L. Y. Murphy, S. Mehrabyan, and C. Butuceanu
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Helium-4, Helium-3, Nuclear Theory, Hadron, Carbon-12, Elementary particle, Atomic physics, Nuclear Experiment, Nucleon, Isotopes of helium
Abstract: The ratios of inclusive electron scattering cross sections of ${}^{4}\mathrm{He},$ ${}^{12}\mathrm{C},$ and ${}^{56}\mathrm{Fe}$ to ${}^{3}\mathrm{He}$ have been measured for the first time. It is shown that these ratios are independent of ${x}_{B}$ at ${Q}^{2}g1.4{\mathrm{GeV}}^{2}$ for ${x}_{B}g1.5,$ where the inclusive cross section depends primarily on the high momentum components of the nuclear wave function. The observed scaling shows that the momentum distributions at high-momenta have the same shape for all nuclei and differ only by a scale factor. The observed onset of the scaling at ${Q}^{2}g1.4{\mathrm{GeV}}^{2}$ and ${x}_{B}g1.5$ is consistent with the kinematical expectation that two-nucleon short range correlations (SRC) dominate the nuclear wave function at ${p}_{m}\ensuremath{\gtrsim}300\mathrm{MeV}/c.$ The values of these ratios in the scaling region can be related to the relative probabilities of SRC in nuclei with $Ag~3.$ Our data, combined with calculations and other measurements of the ${}^{3}\mathrm{H}\mathrm{e}/\mathrm{d}\mathrm{e}\mathrm{u}\mathrm{t}\mathrm{e}\mathrm{r}\mathrm{i}\mathrm{u}\mathrm{m}$ ratio, demonstrate that for nuclei with $Ag~12$ these probabilities are 4.9--5.9 times larger than in deuterium, while for ${}^{4}\mathrm{He}$ it is larger by a factor of about 3.8.
Published: 2003

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