Author: "Pozdniakov, S" / Topic: [phys.nexp]physics [physics]/nuclear experiment [nucl-ex] - Searchworks@Jio Institute Digital Library Search Results

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43 results on '"Pozdniakov, S"'

1. First measurement of the polarization observable E in the View the MathML sourcep→(γ→,π+)n reaction up to 2.25 GeV

Author: Strauch, S., Briscoe, W. J., Döring, M., Klempt, E., Nikonov, V. A., Pasyuk, E., Rönchen, D., Sarantsev, A. V., Strakovsky, I., Workman, R., Adhikari, K. P., Adikaram, D., Anderson, M. D., Pereira, S. Anefalos, Anisovich, A. V., Badui, R. A., Ball, J., Batourine, V., Battaglieri, M., Bedlinskiy, I., Benmouna, N., Biselli, A. S., Brock, J., Brooks, W. K., Burkert, V. D., Cao, T., Carlin, C., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., Dashyan, N., d'Angelo, A., de Vita, R., de Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Lenisa, P., Livingston, K., Lu, H. Y., Macgregor, I . J . D., Markov, N., Mckinnon, B., Meekins, D. G., Meyer, C. A., Mokeev, V., Montgomery, R. A., Moody, C. I., Moutarde, H., Movsisyan, A, Munevar, E., Muñoz Camacho, C., Nadel-Turonski, P., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Park, K., Peng, P., Phelps, W., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Roy, Pascal, Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seely, M. L., Senderovich, I, Sharabian, Y. G., Simonyan, A., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stoler, P., Stepanyan, S., Sytnik, V., Taiuti, M., Tian, Ye, Trivedi, A., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS Collaboration, 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 Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: 6 pages, 3 figures; International audience; First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction $\vec \gamma \vec p \to \pi^+n$, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn-Gatchina, J\"ulich, and SAID groups.
Published: 2015

2. Determination of the beam-spin asymmetry of deuteron photodisintegration in the energy region Eγ=1.1–2.3 GeV

Author: Zachariou, N., Ilieva, Y., Berman, B. L., Ivanov, N. Ya., Sargsian, M. M., Avakian, R., Feldman, G., Nadel-Turonski, P., Adhikari, K. P., Adikaram, D., Anderson, M. D., Pereira, S. Anefalos, Avakian, H., Badui, R. A., Baltzell, N. A., Battaglieri, M., Baturin, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Fedotov, G., Fegan, S., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hughes, S. M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kubarovsky, V., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mattione, P. T., Mckinnon, B., Mineeva, T., Mirazita, M., Mokeeev, V. I., Montgomery, R. A., Moutarde, H., Muñoz Camacho, C., Net, L. A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Phelps, W., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, Pascal, Sabatié, F., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Senderovich, I., Sharabian, Y. G., Skorodumina, Iu., Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strauch, S., Sytnik, V., Taiuti, M., Tian, Ye, Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D., Wei, X., Wood, M. H., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), 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: QUANTUM CHROMODYNAMICS, 2-BODY PHOTODISINTEGRATION, LINEARLY POLARIZED PHOTONS, PROTON ELASTIC-SCATTERING, CROSS-SECTION, HARD PHOTODISINTEGRATION, STRING MODEL, CLAS, PHOTOPRODUCTION, DISINTEGRATION, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NO, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The beam-spin asymmetry, $\Sigma$, for the reaction $\gamma d\rightarrow pn$ has been measured using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility (JLab) for six photon-energy bins between 1.1 and 2.3 GeV, and proton angles in the center-of-mass frame, $\theta_{c.m.}$, between $25^\circ$ and $160^\circ$. These are the first measurements of beam-spin asymmetries at $\theta_{c.m.}=90^\circ$ for photon-beam energies above 1.6 GeV, and the first measurements for angles other than $\theta_{c.m.}=90^\circ$. The angular and energy dependence of $\Sigma$ is expected to aid in the development of QCD-based models to understand the mechanisms of deuteron photodisintegration in the transition region between hadronic and partonic degrees of freedom, where both effective field theories and perturbative QCD cannot make reliable predictions., Comment: 18 pages
Published: 2015

3. Measurement of the structure function of the nearly free neutron using spectator tagging in inelastic H2(e,e′ps)X scattering with CLAS

Author: Tkachenko, S., Baillie, N., Kuhn, S. E., Zhang, J., Arrington, J., Bosted, P., B��ltmann, S., Christy, M. E., Dutta, D., Ent, R., Fenker, H., Griffioen, K. A., Ispiryan, M., Kalantarians, N., Keppel, C. E., Melnitchouk, W., Tvaskis, V., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fleming, J. A., Garillon, B., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Golovatch, E., Gothe, R. W., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Ho, D., Holtrop, M., Hyde, C . E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Jo, H. S., Keller, D., Khandaker, M., Kim, A., Kim, W., King, P. M., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuleshov, S. V., Lenisa, P., Lewis, S., Livingston, K., Lu, H., MacCormick, M., MacGregor, I. J. D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Pappalardo, L. L., Paremuzyan, R., Park, K., Pasyuk, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J . R., Rimal, D., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabati��, F., Schott, D., Schumacher, R. A., Seder, E., Senderovich, I., Sharabian, Y. G., Simonyan, A., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S., Stepanyan, S. S., Strauch, S., Tang, W., Ungaro, M., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D., Wei, X., Weinstein, L. B., Wood, M. H., Zana, L., Zonta, I., 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 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: Nuclear Theory, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, nucl-ex
Abstract: Much less is known about neutron structure than that of the proton due to the absence of free neutron targets. Neutron information is usually extracted from data on nuclear targets such as deuterium, requiring corrections for nuclear binding and nucleon off-shell effects. These corrections are model dependent and have significant uncertainties, especially for large values of the Bjorken scaling variable x. The Barely Off-shell Nucleon Structure (BONuS) experiment at Jefferson Lab measured the inelastic electron deuteron scattering cross section, tagging spectator protons in coincidence with the scattered electrons. This method reduces nuclear binding uncertainties significantly and has allowed for the first time a (nearly) model independent extraction of the neutron structure function. A novel compact radial time projection chamber was built to detect protons with momentum between 70 and 150 MeV/c. For the extraction of the free neutron structure function $F_{2n}$, spectator protons at backward angle and with momenta below 100 MeV/c were selected, ensuring that the scattering took place on a nearly free neutron. The scattered electrons were detected with Jefferson Lab's CLAS spectrometer. The extracted neutron structure function $F_{2n}$ and its ratio to the deuteron structure function $F_{2d}$ are presented in both the resonance and deep inelastic regions. The dependence of the cross section on the spectator proton momentum and angle is investigated, and tests of the spectator mechanism for different kinematics are performed. Our data set can be used to study neutron resonance excitations, test quark hadron duality in the neutron, develop more precise parametrizations of structure functions, as well as investigate binding effects (including possible mechanisms for the nuclear EMC effect) and provide a first glimpse of the asymptotic behavior of d/u as x goes to 1., 28 pages, 22 figures; published in Phys. Rev. C. Revised to include three authors inadvertently left off the original version: D. Dutta, R. Ent, and M. Ispiryan
Published: 2014

4. Strangeness Suppression of qqbar Creation Observed in Exclusive Reaction

Author: Mestayer, M.D., Park, K., P. Adhikari, K., Aghasyan, M., Anefalos Pereira, S., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Colaneri, L., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fleming, J.A., Forest, T.A., Garillon, B., Garçon, M., Ghandilyan, Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guegan, B., Guidal, M., Hakobyan, H., Hanretty, C., Hattawy, M., Holtrop, M., Hughes, S.M., Hyde, C. E., Ilieva, Y., Ireland, D.G., Jiang, H., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Kim, A., Kim, W., Koirala, S., Kubarovsky, V., Kuleshov, S.V., Lenisa, P., Levine, W.I., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Mayer, M., Mckinnon, B., Meyer, C.A., Mirazita, M., Mokeev, V., Montgomery, R.A., Moody, C.I., Moutarde, H., Movsisyan, A., Munoz Camacho, C., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Rimal, D., Ripani, M., Rizzo, A., Rosner, G., Roy, Pascal, Sabatié, F., Saini, M.S., Schott, D., Schumacher, R.A., Simonyan, A., Sokhan, D., Strauch, S., Sytnik, V., Tang, W., Tian, Ye, Ungaro, M., Vernarsky, B., Vlassov, A.V., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Wei, X., Weinstein, L.B., Wood, M.H., Zachariou, N., Zhang, J., Zhao, Z.W., Zonta, I., 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 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: High Energy Physics - Experiment (hep-ex), Physics - Data Analysis, Statistics and Probability, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Data Analysis, Statistics and Probability (physics.data-an), High Energy Physics - Experiment
Abstract: We measured the ratios of electroproduction cross-sections from a proton target for three exclusive meson-baryon final states: $\Lambda K^+$, $p\pi^0$, and $n\pi^+$, with the CLAS detector at Jefferson Lab. Using a simple model of quark hadronization we extract q-qbar creation probabilities for the first time in exclusive two-body production, in which only a single q-qbar pair is created. We observe a sizable suppression of strange quark-antiquark pairs compared to non-strange pairs, similar to that seen in high-energy production., Comment: 5pages, 2figures
Published: 2014

5. Spin and parity measurement of the Lambda(1405) baryon

Author: Moriya, K., Schumacher, R.A., Aghasyan, M., Amaryan, M.J., Anderson, M.D., Anefalos Pereira, S., Ball, J., Baltzell, N.A., Battaglieri, M., Bellis, M., Biselli, A.S., Bono, J., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Cole, P.L., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Dey, B., Djalali, C., Dugger, M., Dupré, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J.A., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Guidal, M., Griffioen, K.A., Hafidi, K., Hakobyan, H., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Kim, W., Koirala, S., Kubarovsky, V., Kuleshov, S.V., Lenisa, P., Lu, H.Y., Macgregor, I.J.D., Markov, N., Mccracken, M., Mckinnon, B., Mestayer, M.D., Meyer, C.A., Mirazita, M., Mokeev, V., Montgomery, R.A., Moutarde, H., Munevar, E., Nadel-Turonski, P., Niccolai, S., Niculescu, I., Osipenko, M., Pappalardo, L.L., Pasyuk, E., Peng, P., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Puckett, A.J.R., Raue, B.A., Rimal, D., Ripani, M., Ritchie, B.G., Rizzo, A., Rosner, G., Roy, Pascal, Sabatié, F., Salgado, C., Schott, D., Seder, E., Senderovich, I., Smith, E.S., Sokhan, D., Smith, G.D., Stepanyan, S., Strauch, S., Tang, W., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Weinstein, L.B., Williams, M., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Ziegler, V., Zhao, Z.W., Zonta, I., 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 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: High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare
Abstract: A determination of the spin and parity of the $\Lambda(1405)$ is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction $\gamma + p \to K^+ + \Lambda(1405)$ is analyzed in the decay channel $\Lambda(1405) \to \Sigma^+ + \pi^-$, where the decay distribution to $\Sigma^+ \pi^-$ and the variation of the $\Sigma^+$ polarization with respect to the $\Lambda(1405)$ polarization direction determines the parity. The $\Lambda(1405)$ is produced, in the energy range $2.55 < W < 2.85$ GeV and for $0.6 < \cos \theta_{K^+} < 0.9$, with polarization $P = 0.45 \pm 0.02 (\text{stat}) \pm 0.07 (\text{syst})$. The analysis shows that the decays are in $S$ wave, with the $\Sigma^+$ polarized such that the $\Lambda(1405)$ has spin-parity $J^P = 1/2^-$, as expected by most theories., Comment: 6 pages, 4 figures, accepted by Phys. Rev. Lett
Published: 2014
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6. Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)

Author: Moriya, K., Schumacher, R.A., Adhikari, K.P., Adikaram, D., Aghasyan, M., Amaryan, M.J., Anderson, M.D., Anefalos Pereira, S., Avakian, H., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bellis, M., Bennett, R.P., Biselli, A.S., Bono, J., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Djalali, C., Doughty, D., Dugger, M., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Fleming, J.A., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guler, N., Guo, L., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Lewis, S., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Martinez, David, Mayer, M., Mccracken, M., Mckinnon, B., Mestayer, M.D., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R.A., Moutarde, H., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Nasseripour, R., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Rimal, D., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Taylor, S., Tian, Y., Tkachenko, S., Ungaro, M., Vernarsky, B., Vineyard, M.F., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Weinstein, L.B., Williams, M., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., Zonta, I., 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, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), CLAS, and 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)
Subjects: High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, High Energy Physics - Experiment
Abstract: We report the exclusive photoproduction cross sections for the Sigma(1385), Lambda(1405), and Lambda(1520) in the reactions gamma + p -> K+ + Y* using the CLAS detector for energies from near the respective production thresholds up to a center-of-mass energy W of 2.85 GeV. The differential cross sections are integrated to give the total exclusive cross sections for each hyperon. Comparisons are made to current theoretical models based on the effective Lagrangian approach and fitted to previous data. The accuracy of these models is seen to vary widely. The cross sections for the Lambda(1405) region are strikingly different for the Sigma+pi-, Sigma0 pi0, and Sigma- pi+ decay channels, indicating the effect of isospin interference, especially at W values close to the threshold., 21 pages, 18 figures, to be submitted to PRC, revised to include a missing reference
Published: 2013

7. Transverse polarization of Sigma(+)(1189) in photoproduction on a hydrogen target in CLAS

Author: Nepali, C. S., Amaryan, M., Adhikari, K. P., Aghasyan, M., Pereira, S. Anefalos, Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Bültmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Collins, P., Contalbrigo, M., Crede, V., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Alaoui, A. El, Fassi, L. El, Fedotov, G., Fegan, S., Fersch, R., Fleming, J. A., Gabrielyan, M. Y., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Lu, H. Y., MacGregor, I . J . D., Markov, N., Mayer, M., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Torayev, B., Vernarsky, B., Vlassov, A. V., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Weygand, D. P., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I., 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 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: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: Experimental results on the $\Sigma^+(1189)$ hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are presented. The $\Sigma^+(1189)$ was reconstructed in the exclusive reaction $\gamma+p\rightarrow K^{0}_{S} + \Sigma^+(1189)$ via the $\Sigma^{+} \to p \pi^{0}$ decay mode. The $K^{0}_S$ was reconstructed in the invariant mass of two oppositely charged pions with the $\pi^0$ identified in the missing mass of the detected $p\pi^+\pi^-$ final state. Experimental data were collected in the photon energy range $E_{\gamma}$ = 1.0-3.5 GeV ($\sqrt{s}$ range 1.66-2.73 GeV). We observe a large negative polarization of up to 95%. As the mechanism of transverse polarization of hyperons produced in unpolarized photoproduction experiments is still not well understood, these results will help to distinguish between different theoretical models on hyperon production and provide valuable information for the searches of missing baryon resonances., Comment: pages 11
Published: 2013

8. Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)

Author: Moriya, K., Schumacher, R.A., Adhikari, K.P., Adikaram, D., Aghasyan, M., Anderson, M.D., Anefalos Pereira, S., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bellis, M., Biselli, A.S., Bono, J., Boiarinov, S., Briscoe, W.J., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Cole, P.L., Collins, P., Crede, V., D'Angelo, A., Dashyan, N., De Sanctis, E., De Vita, R., Deur, A., Dey, B., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Fleming, J.A., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Kvaltine, N.D., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Markov, N., Mayer, M., Mccracken, M., Mckinnon, B., Mestayer, M.D., Meyer, C.A., Mirazita, M., Mineeva, T., Mokeev, V., Montgomery, R.A., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Nasseripour, R., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J.J., Pisano, S., Pivnyuk, N., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Rimal, D., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Smith, G.D., Sober, D.I., Stepanyan, S.S., Stepanyan, S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tang, W., Taylor, S., Taylor, C.E., Tian, Ye, Tkachenko, S., Torayev, B., Ungaro, M., Vernarsky, B., Vlassov, A.V., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Weygand, D.P., Williams, M., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., Zonta, I., 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 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: BARYONS, KAON-NUCLEON INTERACTIONS, CHIRAL DYNAMICS, QUARK-MODEL, RESONANCES, STATES, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or "line shapes" of the Sigma+ pi-, Sigma- pi+ and Sigma0 pi0 final states, from threshold at 1328 MeV/c^2 through the mass range of the Lambda(1405) and the Lambda(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95 < W < 2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 ��(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Sigma0(1385) and from K^* Sigma production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NKbar threshold. A best fit to all the data was obtained after including a phenomenological I=1, J^P = 1/2^- amplitude with a centroid at 1394\pm20 MeV/c^2 and a second I=1 amplitude at 1413\pm10 MeV/c^2. The centroid of the I=0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel-coupling, leading to an apparent overall peak near 1405 MeV/c^2., Figure got replaced during submission, fixed
Published: 2013

9. Separated Structure Functions for Exclusive $K^+\Lambda$ and $K^+\Sigma^0$ Electroproduction at 5.5 GeV with CLAS

Author: Carman, D.S., Park, K., Raue, B.A., Adhikari, K.P., Adikaram, D., Aghasyan, M., Amaryan, M.J., Anderson, M.D., Anefalos Pereira, S., Anghinolfi, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Bono, J., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Celentano, A., Chandavar, S., Charles, G., Cole, P.L., Contalbrigo, M., Cortes, O., Crede, V., d'Angelo, A., Dashyan, N., de Vita, R., de Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Fleming, J.A., Fradi, A., Gabrielyan, M.Y., Gevorgyan, N., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gothe, R.W., Griffioen, K.A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Kvaltine, N.D., Lewis, S., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Mao, Y., Martinez, David, Mayer, M., Mckinnon, B., Mestayer, M.D., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R.A., Moutarde, H., Munevar, E., Munoz Camacho, C., Nadel-Turonski, P., Nasseripour, R., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, S., Pasyuk, E., Phelps, E., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Saylor, N.A., Schott, D., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stepanyan, S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Tian, Y., Tkachenko, S., Trivedi, A., Ungaro, M., Vernarsky, B., Voskanyan, H., Voutier, E., Walford, N.K., Weinstein, L.B., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., Zonta, I., 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, 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, 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: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, High Energy Physics - Experiment
Abstract: We report measurements of the exclusive electroproduction of $K^+\Lambda$ and $K^+\Sigma^0$ final states from an unpolarized proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions $\sigma_U$, $\sigma_{LT}$, $\sigma_{TT}$, and $\sigma_{LT'}$ were extracted from the $\Phi$-dependent differential cross sections acquired with a longitudinally polarized 5.499 GeV electron beam. The data span a broad range of momentum transfers $Q^2$ from 1.4 to 3.9 GeV$^2$, invariant energy $W$ from threshold to 2.6 GeV, and nearly the full center-of-mass angular range of the kaon. The separated structure functions provide an unprecedented data sample, which in conjunction with other meson photo- and electroproduction data, will help to constrain the higher-level analyses being performed to search for missing baryon resonances., Comment: 27 pages, 23 figures
Published: 2013

10. Cross sections for the $\gamma p \to K^{+} \Lambda$ and $\gamma p \to K^{+} \Sigma^{0}$ reactions measured at CLAS

Author: Tang, W., Hicks, K., Keller, D., H. Kim, S., C. Kim, H., Adhikari, K.P., Aghasyan, M., Amaryan, M.J., Anderson, M.D., Anefalos Pereira, S., Baltzell, N.A., Battaglieri, M., Bedlinskiy, I., Biselli, A.S., Bono, J., Boiarinov, S., Briscoe, W.J., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., d'Angelo, A., Dashyan, N., de Vita, R., de Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J.A., Gabrielyan, M.Y., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joo, K., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Livingston, K., Lu, H.Y., Macgregor, I..J .D., Mao, Y., Markov, N., Martinez, David, Mayer, M., Mckinnon, B., Meyer, C.A., Mokeev, V., Moutarde, H., Munevar, E., Muñoz, C., Nadel-Turonski, P., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Phelps, E., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Ripani, M., Rimal, D., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Schumacher, R.A., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stepanyan, S., Stoler, P., Strakovsky, I.I., Strauch, S., Taylor, C.E., Tian, Ye, Tkachenko, S., Torayev, B., Ungaro, M., Vernarsky, B., Vlassov, A.V., Voskanyan, H., Voutier, E., Walford, N.K., Watts, D.P., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z.W., Zonta, I., 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, 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, 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: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The first high-statistics cross sections for the reactions $\gamma p \to K^{*+} \Lambda$ and $\gamma p \to K^{*+} \Sigma^0$ were measured using the CLAS detector at photon energies between threshold and 3.9 GeV at the Thomas Jefferson National Accelerator Facility. Differential cross sections are presented over the full range of the center-of-mass angles, $\theta^{CM}_{K^{*+}}$, and then fitted to Legendre polynomials to extract the total cross section. Results for the $K^{*+}\Lambda$ final state are compared with two different calculations in an isobar and a Regge model, respectively. Theoretical calculations significantly underestimate the $K^{*+} \Lambda$ total cross sections between 2.1 and 2.6 GeV, but are in better agreement with present data at higher photon energies., Comment: 15 pages, 24 figures
Published: 2013

11. Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^\pm p$ scattering

Author: Moteabbed, M., Niroula, M., Raue, B. A., Weinstein, L. B., Adikaram, D., Arrington, J., Brooks, W. K., Lachniet, J., Rimal, Dipak, Ungaro, M., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R. P., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Cole, P. L., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., Fassi, L. El, Eugenio, P., Fedotov, G., Fegan, S., Fersch, R., Fleming, J. A., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Kim, A., Klein, F. J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Lewis, S., Lu, H. Y., MacCormick, M., MacGregor, I . J . D., Martinez, David, Mayer, M., Mckinnon, B., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R. A., Moriya, K., Moutarde, H., Munevar, E., Muñoz Camacho, C., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Phelps, E., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S., Strauch, S., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Voskanyan, H., Voutier, E., Walford, N. K., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I., 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and 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)
Subjects: FOS: Physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. We present the results of a new experimental technique for making direct $e^\pm p$ comparisons, which has the potential to make precise measurements over a broad range in $Q^2$ and scattering angles. We use the Jefferson Lab electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of $Q^2$ and scattering angle. Nonetheless, this measurement yields a data sample for $e^\pm p$ with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. The final ratio of positron to electron scattering: $R=1.027\pm0.005\pm0.05$ for $=0.206$ GeV$^2$ and $0.830\leq \epsilon\leq 0.943$.
Published: 2013

12. Experimental study of the P11(1440) and D13(1520) resonances from the CLAS data on ep→e′π+π−p′

Author: Mokeev, V.I., Burkert, V.D., Elouadrhiri, L., Fedotov, G.V., Golovatch, E.N., Gothe, R.W., Ishkhanov, B.S., Isupov, E.L., Adhikari, K.P., Aghasyan, M., Anghinolﬁ, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N.A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Bookwalter, C., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Carman, D.S., Celentano, A., Charles, G., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., El Alaoui, A., Eugenio, P., Fegan, S., Fradi, A., Giovanetti, K.L., Girod, F.X., Gohn, W., Graham, L., Grifﬁoen, K.A., Guegan, B., Guidal, M., Guo, L., Haﬁdi, K., Hakobyan, H., Hanretty, C., Hicks, K., Ho, D., Holtrop, M., Ilieva, Y., Ireland, D.G., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Kvaltine, N.D., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Mao, Y., Markov, N., Martinez, David, Mayer, M., Mckinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nepali, C.S., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Raue, B.A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Smith, L.C., Sober, D.I., Sokhan, D., Stepanyan, S., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Tang, W., Taylor, C.E., Tian, Ye, Tkachenko, S., Trivedi, A., Ungaro, M., Vineyard, M.F., Voskanyan, H., Voutier, E., Walford, N.K., Wood, M.H., Zachariou, N., Zhao, Z.W., Zonta, I., 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 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: [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: 26 pages, 12 figures, 9 tables, accepted for publication in PRC; The transition helicity amplitudes from the proton ground state to the $P_{11}(1440)$ and $D_{13}(1520)$ excited states ($\gamma_{v}pN^*$ electrocouplings) were determined from the analysis of nine independent one-fold differential $\pi^{+} \pi^{-} p$ electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$^{2}$} $
Published: 2012

13. Evidence for the Onset of Color Transparency in $\rho^0$ Electroproduction off Nuclei

Author: Fassi, L. El, Zana, L., Hafidi, K., Holtrop, M., Mustapha, B., Brooks, W. K., Hakobyan, H., Zheng, X., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Anghinolfi, M., Arrington, J., Avakian, H., Baghdasaryan, H., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Bookwalter, C., Branford, D., Briscoe, W. J., Bultmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Dodge, G. E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Gabrielyan, M. Y., Garcon, M., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hanretty, C., Heddle, D., Hicks, K., Holt, R. J., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jawalkar, S. S., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuhn, S. E., Kuleshov, S. V., Kuznetsov, V., Laget, J. M., Lu, H. Y., MacGregor, I. J. D., Mao, Y., Markov, N., Mayer, M., McAndrew, J., Mckinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Phelps, E., Pisano, S., Pozdniakov, S., Price, J. W., Procureur, S., Protopopescu, D., Raue, B. A., Reimer, P. E., Ricco, G., Rimal, D., Ripani, M., Ritchie, B. G., Rosner, G., Rossi, P., Sabatie, F., Saini, M. S., Salgado, C., Schott, D., Schumacher, R. A., Seraydaryan, H., Sharabian, Y. G., Smith, E. S., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tedeschi, D. J., Tkachenko, S., Ungaro, M., Vernarsky, B ., Vineyard, M. F., Voskanyan, H., Voutier, E., Watts, D., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., Zhao, Z. W., 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and 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)
Subjects: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: We have measured the nuclear transparency of the incoherent diffractive $A(e,e'\rho^0)$ process in $^{12}$C and $^{56}$Fe targets relative to $^2$H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced $\rho^0$'s on a nucleus relative to deuterium, which is sensitive to $\rho A$ interaction, was studied as function of the coherence length ($l_c$), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared ($Q^2$). While the transparency for both $^{12}$C and $^{56}$Fe showed no $l_c$ dependence, a significant $Q^2$ dependence was measured, which is consistent with calculations that included the color transparency effects., Comment: 6 pages and 4 figures
Published: 2012

14. A comparison of forward and backward pp pair knockout in 3He(e,e'pp)n

Author: Baghdasaryan, H., Weinstein, L.B., Laget, J.M., Adhikari, K.P., Aghasyan, M., Amaryan, M.J., Anghinolfi, M., Ball, J., Battaglieri, M., Biselli, A.S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Charles, G., Cole, P.L., Contalbrigo, M., Crede, V., d'Angelo, A., Daniel, A., Dashyan, N., de Sanctis, E., de Vita, R., Djalali, C., Dodge, G.E., Doughty, D., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Fedotov, G., Gabrielyan, M.Y., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Gothe, R.W., Griffioen, K.A., Guegan, B., Guidal, M., Hafidi, K., Hicks, K., Hyde, C. E., Ireland, D.G., Ishkhanov, B.S., Jenkins, D., Jo, H.S., Joo, K., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Kubarovsky, A., Kubarovsky, V., Kuhn, S.E., Kuleshov, S.V., Kvaltine, N.D., Lu, H.Y., Macgregor, I.J.D., Mckinnon, B., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Paolone, M., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pisano, S., Pozdniakov, S., Procureur, S., Raue, B.A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Saini, M.S., Saylor, N.A., Schott, D., Schumacher, R.A., Seraydaryan, H., Smith, E.S., Sober, D.I., Sokan, D., Stepanyan, S.S., Stepanyan, S., Strauch, S., Taiuti, M., Tang, W., Tkachenko, S., Voskanyan, H., Voutier, E., Wood, M.H., Zana, L., Zhao, B., 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 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: Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: Measuring nucleon-nucleon Short Range Correlations (SRC) has been a goal of the nuclear physics community for many years. They are an important part of the nuclear wavefunction, accounting for almost all of the high-momentum strength. They are closely related to the EMC effect. While their overall probability has been measured, measuring their momentum distributions is more difficult. In order to determine the best configuration for studying SRC momentum distributions, we measured the $^3$He$(e,e'pp)n$ reaction, looking at events with high momentum protons ($p_p > 0.35$ GeV/c) and a low momentum neutron ($p_n< 0.2$ GeV/c). We examined two angular configurations: either both protons emitted forward or one proton emitted forward and one backward (with respect to the momentum transfer, $\vec q$). The measured relative momentum distribution of the events with one forward and one backward proton was much closer to the calculated initial-state $pp$ relative momentum distribution, indicating that this is the preferred configuration for measuring SRC., 8 pages, 9 figures, submitted to Phys Rev C. Version 2 incorporates minor corrections in response to referee comments
Published: 2012

15. Measurement of Exclusive $\pi^0$ Electroproduction Structure Functions and their Relationship to transverse generalized parton distributions

Author: Bedlinskiy, I., Kubarovsky, V., Niccolai, S., Stoler, P., Adhikari, K. P., Aghasyan, M., Amaryan, M. J., Anghinolfi, M., Avakian, H., Baghdasaryan, H., Ball, J., Baltzell, N. A., Battaglieri, M., Bennett, R. P., Biselli, A. S., Bookwalter, C., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Contalbrigo, M., Crede, V., d'Angelo, A., Daniel, A., Dashyan, N., de Vita, R., de Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Forest, T. A., Garçon, M., Gevorgyan, N., Giovanetti, K. L., Girod, F. X., Gohn, W., Gothe, R. W., Graham, L., Griffioen, K. A., Guegan, B., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, A., Kuhn, S. E., Kuleshov, S. V., Kvaltine, N. D., Livingston, K., Lu, H. Y., Macgregor, I. J. D., Mao, Y., Markov, N., Martinez, David, Mayer, M., Mckinnon, B., Meyer, C. A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Muñoz Camacho, C., Nadel-Turonski, P., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Pappalardo, L. L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M. S., Salgado, C., Saylor, N., Schott, D., Schumacher, R. A., Seder, E., Seraydaryan, H., Sharabian, Y. G., Smith, G. D., Sober, D. I., Sokhan, D., Stepanyan, S. S., Stepanyan, S., Strauch, S., Taiuti, M., Tang, W., Taylor, C. E., Tian, Ye, Tkachenko, S., Ungaro, M., Vineyard, M. F., Vlassov, A., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Weygand, D. P., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W., Zonta, I., 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, 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: [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: 6 pages, 2 figures; Exclusive $\pi^0$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $\phi_\pi$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$,\ $-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $\sigma_T +\epsilon \sigma_L, \sigma_{TT}$ and $\sigma_{LT}$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $\sigma_T +\epsilon \sigma_L$ and fails to account for $\sigma_{TT}$ and $\sigma_{LT}$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $\pi^0$ electroproduction offers direct experimental access to the transversity GPDs.
Published: 2012

16. Electromagnetic Decay of the $\Sigma^{0}(1385)$ to $\Lambda\gamma$

Author: Keller, D., Hicks, K., Adhikari, K.P., Adikaram, D., Aghasyan, M., Amarian, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R.P., Biselli, A.S., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Careccia, S.L., Carman, D.S., Casey, L., Cole, P.L., Contalbrigo, M., Crede, V., d'Angelo, A., Daniel, A., Dashyan, N., de Vita, R., de Sanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Fegan, S., Forest, T.A., Gabrielyan, M.Y., Gavalian, G., Gevorgyan, N., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Graham, L., Guidal, M., Guegan, B., Hafidi, K., Hakobyan, H., Hanretty, C., Holtrop, M., Ilieva, Y., Ireland, D.G., Isupov, E.L., Jawalkar, S.S., Jenkins, D., Jo, H.S., Joo, K., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Konczykowski, P., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Lu, H.Y., Macgregor, I.J.D., Markov, N., Mcandrew, J., Mckinnon, B., Meyer, C.A., Micherdzinska, A.M., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Pappalardo, L.L., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., A. Raue, B., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., S. Saini, M., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Smith, G.D., Sober, D.I., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Vernarsky, B., Vineyard, M.F., Voutier, E., Weinstein, L.B., Watts, D.P., Wood, M.H., Zachariou, N., Zana, L., Zhao, B., Zhao, Z.W., 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 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: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, High Energy Physics - Experiment
Abstract: The electromagnetic decay $\Sigma^0(1385) \to \Lambda \gamma$ was studied using the CLAS detector at the Thomas Jefferson National Accelerator Facility. A real photon beam with a maximum energy of 3.8 GeV was incident on a proton target, producing an exclusive final state of $K^+\Sigma^{*0}$. We report the decay widths ratio $\Sigma^0(1385) \to \Lambda\gamma$/ $\Sigma^0(1385) \to \Lambda\pi^0$ = $1.42 \pm 0.12(\text{stat})_{-0.07}^{+0.11}(\text{sys})$%. This ratio is larger than most theoretical predictions by factors ranging from 1.5-3, but is consistent with the only other experimental measurement. From the reported ratio we calculate the partial width and electromagnetic transition magnetic moment for $\Sigma^0(1385) \to \Lambda\gamma$.
Published: 2011

17. Measurement of the nuclear multiplicity ratio for $K^0_s$ hadronization at CLAS

Author: Daniel, A., Hicks, K., Brooks, W.K., Hakobyan, H., Adhikari, K.P., Adikaram, D., Aghasyan, M., Amarian, M., Anghinolfi, M., Avakian, H., Baghdasaryan, H., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bennett, R.P., Biselli, A.S., Bookwalter, C., Briscoe, W.J., Burkert, V.D., Carman, D.S., Casey, L., Celentano, A., Chandavar, S., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Egiyan, H., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Gabrielyan, M.Y., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hanretty, C., Heddle, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jawalkar, S.S., Jo, H.S., Joo, K., Kalantarians, N., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Lu, H.Y., Macgregor, I.J.D., Mao, Y., Markov, N., Mayer, M., McAndrew, J., Mckinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Pappalardo, L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Phelps, E., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Raue, B.A., Ricco, G., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Schumacher, R.A., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stepanyan, S., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Tkachenko, S., Ungaro, M., Vernarsky, B., Vineyard, M.F., Voskanyan, H., Voutier, E., Watts, D.P., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zana, L., Zachariou, N., Zhao, B., Zhao, Z.W., 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, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and 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)
Subjects: FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The influence of cold nuclear matter on lepto-production of hadrons in semi-inclusive deep inelastic scattering is measured using the CLAS detector in Hall B at Jefferson Lab and a 5.014 GeV electron beam. We report the $K_s^0$ multiplicity ratios for targets of C, Fe, and Pb relative to deuterium as a function of the fractional virtual photon energy $z$ transferred to the $K_s^0$ and the transverse momentum squared $p_{T}^2$ of the $K_s^0$. We find that the multiplicity ratios for $K^0_s$ are reduced in the nuclear medium at high $z$ and low $p_{T}^2$, with a trend for the $K^0_s$ transverse momentum to be broadened in the nucleus for large $p_{T}^2$., Submitted to Phys. Lett. B
Published: 2011

18. Differential cross sections and recoil polarizations for the reaction gamma p -> K+ Sigma0

Author: Dey, B., Meyer, C.A., Bellis, M., E. Mccracken, M., Williams, M., Adhikari, K.P., Aghasyan, M., Anghinolfi, M., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Berman, B., Biselli, A.S., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Crede, V., D'Angelo, A., Daniel, A., De Vita, R., De Sanctis, E., Deur, A., Dhamija, S., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fegan, S., Fradi, A., Gabrielyan, M.Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Gothe, R.W., Graham, L., Griffioen, K.A., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Jawalkar, S.S., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Konczykowski, P., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Livingston, K., Macgregor, I.J.D., Martinez, David, McAndrew, J., Mckinnon, B., Mikhailov, K., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Nepali, C.S., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M.R., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Raue, B.A., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Salamanca, J., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Strakovsky, I.I., Strauch, S., Tang, W., Taylor, C.E., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Watts, D.P., Vernarsky, B., Vineyard, M.F., Voutier, E., Weinstein, L.B., Wood, M.H., Yegneswaran, A., Zhang, J., Zhao, B., Zhao, Z.W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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 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: [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, High Energy Physics - Experiment
Abstract: High-statistics measurements of differential cross sections and recoil polarizations for the reaction $\gamma p \rightarrow K^+ \Sigma^0$ have been obtained using the CLAS detector at Jefferson Lab. We cover center-of-mass energies ($\sqrt{s}$) from 1.69 to 2.84 GeV, with an extensive coverage in the $K^+$ production angle. Independent measurements were made using the $K^{+}p\pi^{-}$($\gamma$) and $K^{+}p$($\pi^-, \gamma$) final-state topologies, and were found to exhibit good agreement. Our differential cross sections show good agreement with earlier CLAS, SAPHIR and LEPS results, while offering better statistical precision and a 300-MeV increase in $\sqrt{s}$ coverage. Above $\sqrt{s} \approx 2.5$ GeV, $t$- and $u$-channel Regge scaling behavior can be seen at forward- and backward-angles, respectively. Our recoil polarization ($P_\Sigma$) measurements represent a substantial increase in kinematic coverage and enhanced precision over previous world data. At forward angles we find that $P_\Sigma$ is of the same magnitude but opposite sign as $P_\Lambda$, in agreement with the static SU(6) quark model prediction of $P_\Sigma \approx -P_\Lambda$. This expectation is violated in some mid- and backward-angle kinematic regimes, where $P_\Sigma$ and $P_\Lambda$ are of similar magnitudes but also have the same signs. In conjunction with several other meson photoproduction results recently published by CLAS, the present data will help constrain the partial wave analyses being performed to search for missing baryon resonances., Comment: 23 pages, 17 figures
Published: 2010

19. Tensor Correlations Measured in 3He(e,e'pp)n

Author: Baghdasaryan, H., Weinstein, L.B., Laget, J.M., Adhikari, K.P., Aghasyan, M., Amarian, M., Anghinolfi, M., Avakian, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Berman, B.L., Biselli, A.S., Bookwalter, C., Briscoe, W.J., Brooks, W.K., Bültmann, S., Burkert, V.D., Carman, D.S., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., Devita, R., DeSanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Eugenio, P., Fegan, S., Gabrielyan, M.Y., Gilfoyle, G.P., Giovanetti, K.L., Gohn, W., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Gyurjyan, V., Hakobyan, H., Hanretty, C., Hyde, C. E., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Konczykowski, P., Kubarovsky, V., Kuhn, S.E., Kuleshov, S.V., Kuznetsov, V., Kvaltine, N.D., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Markov, N., Mayer, M., McAndrew, J., Mckinnon, B., Meyer, C.A., Mikhailov, K., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nepali, C., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Pereira, S. Anefalos, Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Schumacher, R.A., Seraydaryan, H., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stepanyan, S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Tedeschi, D.J., Ungaro, M., Vineyard, M.F., Voutier, E., Watts, D.P., Weygand, D.P., Wood, M.H., Zhao, B., Zhao, Z.W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), 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 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)
Subjects: Nuclear Theory (nucl-th), Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: We have measured the 3He(e,e'pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of pp to pn pairs as a function of pair total momentum, $p_{tot}$. For pair relative momenta between 0.3 and 0.5 GeV/c, the ratio is very small at low $p_{tot}$ and rises to approximately 0.5 at large $p_{tot}$. This shows the dominance of tensor over central correlations at this relative momentum., Comment: 4 pages, 4 figures, submitted to PRL
Published: 2010

20. Coherent Photoproduction of pi^+ from 3^He

Author: Nasseripour, R., Berman, B.L., Adhikari, K.P., Adikaram, D., Anghinolfi, M., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Casey, L., Cole, P.L., Collins, P., Crede, V., D'Angelo, A., Daniel, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dickson, R., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Fegan, S., Fradi, A., Gabrielyan, M.Y., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gothe, R.W., Graham, L., Griffioen, K.A., Guegan, B., Hafidi, K., Hakobyan, H., Hanretty, C., Heddle, D., Holtrop, M., Hyde, C. E., Ilieva, Y., Ireland, D.G., Isupov, E.L., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Konczykowski, P., Kubarovsky, V., Kuhn, S.E., Kuleshov, S.V., Kuznetsov, V., Kvaltine, N.D., Livingston, K., Lu, H.Y., Macgregor, I.J.D., Mayer, M., McAndrew, J., Mckinnon, B., Micherdzinska, A.M., Mirazita, M., Moriya, K., Moreno, B., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Perrin, Y., Pisano, S., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Schumacher, R.A., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stepanyan, S., Stoler, P., Strauch, S., Suleiman, R., Taiuti, M., Tang, W., Taylor, C.E., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Vernarsky, B., Vineyard, M.F., Voutier, E., Watts, D.P., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zhao, B., Zhao, Z.W., 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), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), CLAS, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and 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)
Subjects: H-3, FOS: Physical sciences, PION-PHOTOPRODUCTION, RESONANCE, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], THRESHOLD, REGION, Settore FIS/04 - Fisica Nucleare e Subnucleare, CLAS, SYSTEM, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: We have measured the differential cross section for the $\gamma$$^3$He$\rightarrow \pi^+ t$ reaction. This reaction was studied using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. Real photons produced with the Hall-B bremsstrahlung tagging system in the energy range from 0.50 to 1.55 GeV were incident on a cryogenic liquid $^3$He target. The differential cross sections for the $\gamma$$^3$He$\rightarrow \pi^+ t$ reaction were measured as a function of photon-beam energy and pion-scattering angle. Theoretical predictions to date cannot explain the large cross sections except at backward angles, showing that additional components must be added to the model., Comment: 11 pages, 16 figures
Published: 2010
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21. Absorption of the $\omega$ and $\phi$ Mesons in Nuclei

Author: Wood, M.H., Nasseripour, R., Paolone, M., Djalali, C., Weygand, D.P., Adhikari, K.P., Anghinolfi, M., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Bellis, M., Berman, B.L., Biselli, A.S., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Careccia, S.L., Carman, D.S., Cole, P.L., Collins, P., Crede, V., d'Angelo, A., Daniel, A., de Vita, R., de Sanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Doughty, D., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fegan, S., Gabrielyan, M.Y., Garçon, M., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gothe, R.W., Graham, L., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Jawalkar, S.S., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, A., Kim, W., Klein, A., Klein, F.J., Konczykowski, P., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Livingston, K., Martinez, David, Mayer, M., Mcandrew, J., Mccracken, M.E., Mckinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Munevar, E., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M.R., Osipenko, M., Ostrovidov, A.I., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ricco, G., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salamanca, J., Salgado, C., Schott, D., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tang, W., Taylor, C.E., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Vernarsky, B., Vineyard, M.F., Voutier, E., Watts, D.P., Weinstein, L.B., Zhang, J., Zhao, B., Zhao, Z.W., 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, 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: PHOTON, RHO-MESON, MATTER, PHOTOPRODUCTION, PROPAGATION, PHOTON, DECAY, MASS, Nuclear Theory, PHOTOPRODUCTION, High Energy Physics::Experiment, RHO-MESON, PROPAGATION, MASS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, MATTER, DECAY
Abstract: Due to their long lifetimes, the $\omega$ and $\phi$ mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from $^{2}$H, C, Ti, Fe, and Pb targets. This paper reports the first measurement of the ratio of nuclear transparencies for the $e^{+}e^{-}$ channel. The ratios indicate larger in-medium widths compared with what have been reported in other reaction channels., Comment: 6 pages, 4 figures
Published: 2010

22. Measurement of the Nucleon Structure Function F2 in the Nuclear Medium and Evaluation of its Moments

Author: Osipenko, M, Ricco, G, Simula, S, Ripani, M, Taiuti, M, Adhikari, K, Amaryan, M, Anghinolfi, M, Avakian, H, Baghdasaryan, H, Battaglieri, M, Batourine, V, Bedlinskiy, I, Biselli, A, Branford, D, Briscoe, W, Brooks, W, Burkert, V, Careccia, S, Carman, D, Cole, P, Collins, P, Crede, V, D'Angelo, A, Daniel, A, Dashyan, N, De Vita, R, De Sanctis, E, Deur, A, Dey, B, Dhamija, S, Dickson, R, Djalali, C, Doughty, D, Dupre, R, Egiyan, H, El Alaoui, A, Eugenio, P, Fegan, S, Forest, T, Fradi, A, Gabrielyan, M, Gevorgyan, N, Gilfoyle, G, Giovanetti, K, Gohn, W, Gothe, R, Griffioen, K, Guo, L, Hafidi, K, Hakobyan, H, Hanretty, C, Hassall, N, Heddle, D, Hicks, K, Holtrop, M, Ilieva, Y, Ireland, D, Isupov, E, Jawalkar, S, Jo, H, Joo, K, Keller, D, Khandaker, M, Khetarpal, P, Kim, W, Klein, A, Klein, F, Kubarovsky, V, Kuhn, S, Kuleshov, S, Kuznetsov, V, Livingston, K, Lu, H, Martinez, D, Mayer, M, Mcandrew, J, Mccracken, M, Mckinnon, B, Meyer, C, Mirazita, M, Mokeev, V, Moreno, B, Moriya, K, Morrison, B, Moutarde, H, Munevar, E, Nadel Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, I, Ostrovidov, A, Paremuzyan, R, Park, K, Park, S, Pasyuk, E, Pereira, S, Pisano, S, Pogoreiko, O, Pozdniakov, S, Price, J, Procureur, S, Prok, Y, Protopopescu, D, Raue, B, Rosner, G, Rossi, P, Sabatie, F, Saini, M, Salamanca, J, Salgado, C, Saracco, P, Schumacher, R, Seraydaryan, H, Sharabian, Y, Smith, E, Sober, D, Sokhan, D, Stepanyan, S, Stoler, P, Strauch, S, Tedeschi, D, Tkachenko, S, Ungaro, M, Vernarsky, B, Vineyard, M, Voutier, E, Watts, D, Weygand, D, Wood, M, Yegneswaran, A, Zhang, J, Zhao, B, 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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: Moments, Nuclear Theory, FOS: Physical sciences, PRECISION-MEASUREMENT, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], INELASTIC STRUCTURE FUNCTIONS, STRUCTURE-FUNCTION RATIOS, INCLUSIVE ELECTRON-SCATTERING, RADIATIVE-CORRECTIONS, PRECISION-MEASUREMENT, CROSS-SECTIONS, NNLO EVOLUTION, LEADING TWIST, HIGH Q2, CARBON, Settore FIS/04 - Fisica Nucleare e Subnucleare, CROSS-SECTIONS, High Energy Physics - Experiment, Nucleon structure, CARBON, High Energy Physics - Experiment (hep-ex), LEADING TWIST, High Energy Physics - Phenomenology (hep-ph), INCLUSIVE ELECTRON-SCATTERING, INELASTIC STRUCTURE FUNCTIONS, Higher twists, RADIATIVE-CORRECTIONS, Nuclear Experiment (nucl-ex), Nuclear Experiment, STRUCTURE-FUNCTION RATIOS, QCD, Nuclear modifications, OPE, NNLO EVOLUTION, HIGH Q2, High Energy Physics - Phenomenology
Abstract: We report on the measurement of inclusive electron scattering off a carbon target performed with CLAS at Jefferson Laboratory. A combination of three different beam energies 1.161, 2.261 and 4.461 GeV allowed us to reach an invariant mass of the final-state hadronic system W~2.4 GeV with four-momentum transfers Q2 ranging from 0.2 to 5 GeV2. These data, together with previous measurements of the inclusive electron scattering off proton and deuteron, which cover a similar continuous two-dimensional region of Q2 and Bjorken variable x, permit the study of nuclear modifications of the nucleon structure. By using these, as well as other world data, we evaluated the F2 structure function and its moments. Using an OPE-based twist expansion, we studied the Q2-evolution of the moments, obtaining a separation of the leading-twist and the total higher-twist terms. The carbon-to-deuteron ratio of the leading-twist contributions to the F2 moments exhibits the well known EMC effect, compatible with that discovered previously in x-space. The total higher-twist term in the carbon nucleus appears, although with large systematic uncertainites, to be smaller with respect to the deuteron case for n, 37 pages, 15 figures
Published: 2010

23. Differential cross section of gamma n to K+ Sigma- on bound neutrons with incident photons from 1.1 to 3.6 GeV

Author: Anefalos Pereira, S., Mirazita, M., Rossi, P., de Sanctis, E., Niculescu, G., Niculescu, I., Stepanyan, S., Adhikari, K.P., Aghasyan, M., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Berman, B.L., Biselli, A.S., Bookwalter, C., Branford, D., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Careccia, S.L., Carman, D.S., Cole, P.L., Collins, P., Crede, V., d'Angelo, A., Daniel, A., Dashyan, N., de Vita, R., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., Eugenio, P., Fegan, S., Forest, T.A., Gabrielyan, M.Y., Gavalian, G., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gothe, R.W., Griffioen, K.A., Guidal, M., Guler, N., Guo, L., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Jawalkar, S.S., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, F.J., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Livingston, K., Mayer, M., Mccracken, M.E., Mckinnon, B., Meyer, C.A., Mikhailov, K., Mineeva, T., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A.I., Park, K., Park, S., Pasyuk, E., Perrin, Y., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B.A., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Sabatié, F., Saini, M.S., Salamanca, J., Salgado, C., Schumacher, R.A., Seder, E., Seraydaryan, H., Sharabian, Y.G., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Tedeschi, D.J., Tkachenko, S., Vernarsky, B., Vineyard, M.F., Voutier, E., Watts, D.P., Weygand, D.P., Wood, M.H., Zana, L., Zhang, J., Zhao, B., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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 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: Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: Differential cross sections of the reaction gamma d to K+ Sigma- (p) have been measured with the CLAS detector at Jefferson Lab using incident photons with energies between 1.1 and 3.6 GeV. This is the first complete set of strangeness photoproduction data on the neutron covering a broad angular range. At energies close to threshold and up to E_gamma ~ 1.8 GeV, the shape of the angular distribution is suggestive of the presence of s-channel production mechanisms. For E_gamma > 1.8 GeV, a clear forward peak appears and becomes more prominent as the photon energy increases, suggesting contributions from t-channel production mechanisms. These data can be used to constrain future analysis of this reaction., 5 pages, 3 figures
Published: 2009

24. Partial wave analysis of the reaction γp→pω and the search for nucleon resonances

Author: Williams, M., Applegate, D., Bellis, M., Meyer, C.A., Adhikari, K.P., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Berman, B.L., Biselli, A.S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Careccia, S.L., Carman, D.S., Cole, P.L., Collins, P., Crede, V., D'Angelo, A., Daniel, A., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fradi, A., Gabrielyan, M.Y., Garçon, M., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guler, N., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jawalkar, S.S., Jo, H.S., Johnstone, J.R., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F.J., Krahn, Z., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Livingston, K., Lu, H.Y., Mayer, M., McAndrew, J., Mccracken, M.E., Mckinnon, B., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Munevar, E., Nadel-Turonski, P., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M.R., Niyazov, R.A., Osipenko, M., Ostrovidov, A.I., Paris, M., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Perrin, Y., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salamanca, J., Salgado, C., Schott, D., Schumacher, R.A., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Vineyard, M.F., Voutier, E., Watts, D.P., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zhang, J., Zhao, B., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, 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: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published: 2009

25. Search for the Photoexcitation of Exotic Mesons in the pi+pi+pi- System

Author: Nozar, M., Salgado, C., P. Weygand, D., Guo, L., Adams, G., Li, J., Eugenio, P., J. Amaryan, M., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., P. Ball, J., Baltzell, N.A., Barrow, S., Battaglieri, M., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., L. Berman, B., S. Biselli, A., Blaszczyk, L., E. Bonner, B., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., J. Briscoe, W., K. Brooks, W., Bültmann, S., D. Burkert, V., Butuceanu, C., R. Calarco, J., L. Careccia, S., S. Carman, D., Carnahan, B., Casey, L., Cazes, A., Chen, Si, Cheng, L., L. Cole, P., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Crede, V., P. Cummings, J., Dale, D., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., V. Degtyarenko, P., Denizli, H., Dennis, L., Deur, A., V. Dharmawardane, K., S. Dhuga, K., Dickson, R., Djalali, C., E. Dodge, G., Doughty, D., Dugger, M., Dytman, S., P. Dzyubak, O., Egiyan, H., S. Egiyan, K., El Fassi, L., Elouadrhiri, L., Fatemi, R., Fedotov, G., J. Feuerbach, R., Forest, T.A., Fradi, A., Funsten, H., Garçon, M., Gavalian, G., Gevorgyan, N., P. Gilfoyle, G., L. Giovanetti, K., X. Girod, F., T. Goetz, J., W. Gothe, R., A. Griffioen, K., Guidal, M., Guillo, M., Guler, N., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hanretty, C., Hardie, J., Hassall, N., Heddle, D., W. Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., E. Hyde-Wright, C., Ilieva, Y., G. Ireland, D., S. Ishkhanov, B., L. Isupov, E., M. Ito, M., Jenkins, D., S. Jo, H., R. Johnstone, J., Joo, K., G. Juengst, H., Kalantarians, N., D. Kellie, J., Khandaker, M., Kim, W., Klein, A., J. Klein, F., Kossov, M., Krahn, Z., H. Kramer, L., Kubarovsky, V., Kuhn, J., E. Kuhn, S., V. Kuleshov, S., Kuznetsov, V., Lachniet, J., M. Laget, J., Langheinrich, J., Lawrence, D., Livingston, K., Y. Lu, H., MacCormick, M., Markov, N., Mattione, P., McAleer, S., Mckinnon, B., W. C. Mcnabb, J., A. Mecking, B., Mehrabyan, S., D. Mestayer, M., Meyer, C.A., Mibe, T., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Moreno, B., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., S. Mutchler, G., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., B. Niczyporuk, B., R. Niroula, M., A. Niyazov, R., V. O'Rielly, G., Osipenko, M., I. Ostrovidov, A., Park, K., Pasyuk, E., Paterson, C., Anefalos Pereira, S., Philips, S.A., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Popa, I., Pozdniakov, S., M. Preedom, B., W. Price, J., Prok, Y., Protopopescu, D., M. Qin, L., A. Raue, B., Riccardi, G., Ricco, G., Ripani, M., G. Ritchie, B., Ronchetti, F., Rosner, G., Rossi, P., D. Rubin, P., Sabatié, F., Salamanca, J., P. Santoro, J., Sapunenko, V., A. Schumacher, R., S. Serov, V., G. Sharabian, Y., Sharov, D., V. Shvedunov, N., V. Skabelin, A., S. Smith, E., C. Smith, L., I. Sober, D., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., E. Stokes, B., Stoler, P., I. Strakovsky, I., Strauch, S., Taiuti, M., J. Tedeschi, D., Thoma, U., Tkabladze, A., Tkachenko, S., Todor, L., Ungaro, M., F. Vineyard, M., V. Vlassov, A., P. Watts, D., B. Weinstein, L., Williams, M., Wolin, E., H. Wood, M., Yegneswaran, A., Zana, L., Zhang, J., Zhao, B., W. Zhao, Z., Collaboration), (clas, 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: High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Physics and Astronomy(all), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment
Abstract: A search for exotic mesons in the $\pi^{+}\pi^{+}\pi^{-}$ system photoproduced by the charge exchange reaction $\gamma p\to \pi^{+}\pi^{+}\pi^{-}(n)$ was carried out by the CLAS collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on a sample of 83,000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic $J^{PC} = 1^{-+}$ resonant state in the 1 to 2 GeV mass range. Our PWA analysis, based on the isobar model, shows production of the $a_{2}(1320)$ and the $\pi_{2}(1670)$ mesons, but no evidence for the $a_{1}(1260)$, nor the $\pi_{1}(1600)$ exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic $\pi_1(1600)$ cross section, less than 2% of the $a_2(1320)$ production., Comment: 6 pages, 5 figures, to be submitted to Phys.Rev.Lett
Published: 2009

26. Differential cross sections and spin density matrix elements for the reaction γp -> pω

Author: Williams, M., Applegate, D., Bellis, M., Meyer, C.A., Adhikari, K.P., Anghinolfi, M., Baghdasaryan, H., Ball, J., Battaglieri, M., Bedlinskiy, I., Berman, B.L., Biselli, A.S., Bookwalter, C., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Careccia, S.L., Carman, D.S., Cole, P.L., Collins, P., Crede, V., D'Angelo, A., Daniel, A., De Vita, R., De Sanctis, E., Deur, A., Dey, B., Dhamija, S., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Dugger, M., Dupre, R., El Alaoui, A., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fradi, A., Gabrielyan, M.Y., Garçon, M., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hassall, N., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jawalkar, S.S., Jo, H.S., Johnstone, J.R., Joo, K., Keller, D., Khandaker, M., Khetarpal, P., Kim, W., Klein, A., Klein, F.J., Krahn, Z., Kubarovsky, V., Kuleshov, S.V., Kuznetsov, V., Livingston, K., Lu, H.Y., Mayer, M., McAndrew, J., Mccracken, M.E., Mckinnon, B., Mikhailov, K., Mirazita, M., Mokeev, V., Moreno, B., Moriya, K., Morrison, B., Moutarde, H., Munevar, E., Nadel-Turonski, P., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Niroula, M.R., Niyazov, R.A., Osipenko, M., Ostrovidov, A.I., Paris, M., Park, K., Park, S., Pasyuk, E., Anefalos Pereira, S., Perrin, Y., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Protopopescu, D., Raue, B.A., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salamanca, J., Salgado, C., Schott, D., Schumacher, R.A., Seraydaryan, H., Sharabian, Y.G., Smith, E.S., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tedeschi, D.J., Tkachenko, S., Ungaro, M., Vineyard, M.F., Voutier, E., Watts, D.P., Weinstein, L.B., Weygand, D.P., Wood, M.H., Zhang, J., Zhao, B., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CLAS, 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: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published: 2009

27. Polarized structure function sigma(')(LT) for (1)H((e)over-right-arrow,e(')K(+))Lambda in the nucleon resonance region

Author: Nasseripour, R., Raue, B.A., Carman, D. S., Ambrozewicz, P., Amaryan, M.J., Anciant, E., Anghinolfi, M., Asavapibhop, B., Asryan, G., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J.P., Baltzell, N. A., Barrow, S., Battaglieri, M., Beard, K., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B. L., Biselli, A.S., Blaszczyk, L., Bonner, B.E., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W. J., Brooks, W.K., Burkert, V.D., Butuceanu, C., Calarco, J.R., Careccia, S.L., Casey, L., Cetina, C., Chen, Si, Cheng, L., Cole, P.L., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crede, V., Dale, D., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P.V., Dennis, L., Deur, A., Dhuga, K.S., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., Egiyan, K.S., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Feuerbach, R.J., Forest, T.A., Fradi, A., Funsten, H., Garccon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girard, Pascal, Girod, F.X., Goetz, J. T., Gothe, R.W., Griffioen, K.A., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hafidi, K., Hakobyan, H., Hanretty, C., Hardie, J., Heddle, D., Hersman, F.W., Hicks, K., Hleiqawi, I., Holtrop, M., Hu, J., Hyde-Wright, C.E., Llieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Ito, M.M., Jenkins, D., Jo, H.S., Johnstone, J.R., Joo, K., Juengst, H.G., Kalantarians, N., Kellie, J.D., Khandaker, M., Kim, K.Y., Kim, K., Kim, W., Klein, A., Klein, F.J., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuhn, S.E., Kuleshov, S.V., Kuznetsov, V., Lachniet, J., Laget, J.M., Langheinrich, J., Lawrence, D., Livingston, K., Lu, H.Y., Lukashin, K., Mac Cormick, M., Manak, J.J., Markov, N., Mattione, P., Mc Aleer, S., Mc Kinnon, B., Mc Nabb, Jwc, Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Moreno, B., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G.S., Nadel-Turonski, P., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., Osipenko, M., Ostrovidov, A.I., Park, K., Pasyuk, E., Paterson, C., Pereira, S.A., Peterson, G., Philips, S.A., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Pozdniakov, S., Preedom, B.M., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Qin, L.M., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, Philippe, Rubin, P.D., Sabatie, F., Salamanca, J., Salgado, C., Santoro, J.P., Sapunenko, V., Sayre, D., Schumacher, R.A., Serov, V.S., Shafi, A., Sharabian, Y.G., Sharov, D., Shvedunov, N.V., Simionatto, S., Skabelin, A.V., Smith, E.S., Smith, L.C., Sober, D.I., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Taylor, S., Tedeschi, D.J., Thompson, R., Tkabladze, A., Tkachenko, S., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Wang, K., Watts, D.P., Weinstein, L.B., Weygand, D.P., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Zana, L., Zhang, J., Zhao, B., Zhao, Z. W., 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), Laboratoire de mécanique des sols, structures et matériaux (MSSMat), CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), Cambridge Arctic Shelf Programme (CASP), University of Cambridge [UK] (CAM), Smart Engineering Asset Management Laboratory, City University of Hong Kong [Hong Kong] (CUHK), Department of Electrical Engineering [Korea Advanced Institute of Science and Technology] (KAIST), Korea Advanced Institute of Science and Technology (KAIST), 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, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Laboratoire d'Intégration des Systèmes et des Technologies (LIST), 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: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: International audience; The first measurements of the polarized structure function σLT′ for the reaction p(e⃗ ,e′K+)Λ in the nucleon resonance region are reported. Measurements are included from threshold up to W=2.05 GeV for central values of Q2 of 0.65 and 1.00 GeV2, and nearly the entire kaon center-of-mass angular range. σLT′ 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 non-resonant processes. The results for σLT′ are comparable in magnitude to previously reported results from CLAS for σLT, the real part of the same response. An intriguing sign change in σLT′ is observed in the high Q2 data at W≈1.9 GeV. Comparisons to several existing model predictions are shown.
Published: 2008

28. Moments of the Spin Structure Functions g_1^p and g_1^d for 0.05 < Q^2 < 3.0 GeV^2

Author: Prok, Y., Bosted, P., Burkert, V. D., Deur, A., Dharmawardane, K. V., Dodge, G. E., Griffioen, K. A., Kuhn, S. E., Minehart, R., Adams, G., Amaryan, M.J., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J.P., Baltzell, N.A., Barrow, S., Battaglieri, M., Beard, K., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B.L., Biselli, A.S., Blaszczyk, L., Boiarinov, S., Bonner, B.E., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., B¨ultmann, S., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carman, D.S., Casey, L., Cazes, A., Chen, Si, Cheng, L., Cole, P.L., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crede, V., Cummings, J.P., Dale, D., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P.V., Denizli, H., Dennis, L., Dhuga, K.S., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., Egiyan, K.S., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Fersh, R.G., Feuerbach, R.J., Forest, T.A., Fradi, A., Funsten, H., Garçon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Golovatch, E., Gothe, R.W., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hanretty, C., Hardie, J., Hassall, N., Heddle, D., Hersman, F.W., Hicks, K., Hleiqawi, I., Holtrop, M., Huertas, M., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Ito, M.M., Jenkins, D., Jo, H.S., Johnstone, J.R., Joo, K., Juengst, H.G., Kalantarians, N., Keith, C.D., Kellie, J.D., Khandaker, M., Kim, K.Y., Kim, K., Kim, W., Klein, A., Klein, F.J., Klusman, M., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuleshov, S.V., Lachniet, J., Laget, J.M., Langheinrich, J., Lawrence, D., Li, Ji, Lima, A.C.S., Livingston, K., Lu, H.Y., Lukashin, K., MacCormick, M., Marchand, C., Markov, N., Mattione, P., McAleer, S., Mckinnon, B., McNabb, J.W.C., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mibe, T., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Moreno, B., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G.S., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Osipenko, M., Ostrovidov, A.I., Park, K., Pasyuk, E., Paterson, C., Anefalos Pereira, S., Philips, S.A., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Popa, I., Pozdniakov, S., Preedom, B.M., Price, J.W., Procureur, S., Protopopescu, D., Qin, L.M., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Rowntree, D., Rubin, P.D., Sabatié, F., Salamanca, J., Salgado, C., Santoro, J.P., Sapunenko, V., Schumacher, R.A., Seely, M.L., Serov, V.S., Sharabian, Y.G., Sharov, D., Shaw, J., Shvedunov, N.V., Skabelin, A.V., Smith, E.S., Smith, L.C., Sober, D.I., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strakovsky, I.I., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D.J., Tkabladze, A., Tkachenko, S., Todor, L., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Watts, D.P., Weinstein, L.B., Weygand, D.P., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Zana, L., Zhang, J., Zhao, B., Zhao, Z.W., 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), 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), 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: Spin structure functions, 13.60.Hb, 13.88.+e, 14.20.Dh, nucleon structure, Nuclear Theory, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Chiral Perturbation Theory
Abstract: The spin structure functions g_1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH_3 and ND_3 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 result for the generalized forward spin polarizability of the proton gamma_0^p is also reported. This quantity shows strong Q^2 dependence at low Q^2, while Q^6\gamma_0^p seems to flatten out at the highest Q^2 accessed by our experiment. Although the first moments of g_1 are consistent with Chiral Perturbation Theory (ChPT) calculations up to approximately Q^2 = 0.06 GeV^2, a significant discrepancy is observed between the \gamma_0^p data and ChPT for gamma_0^p, even at the lowest Q2., Comment: Final version as published in PLB. Added a parametrization of world data at high Q^2 to Fig. 3
Published: 2008

29. Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS

Author: Santoro, J. P., Smith, E. S., Garçon, M., Guidal, M., Laget, J. M., Weiss, C., Adams, G., Amaryan, M.J., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J., Ball, J.P., Baltzell, N.A., Barrow, S., Battaglieri, M., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B.L., Biselli, A.S., Blaszczyk, L., Bonner, B.E., Bookwalter, C., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., B¨ultmann, S., Burkert, V.D., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carman, D.S., Casey, L., Cazes, A., Chen, Si, Cheng, L., Cole, P.L., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Crede, V., Cummings, J.P., Dale, D., Dashyan, N., De Masi, R., De Sanctis, E., De Vita, R., Degtyarenko, P.V., Denizli, H., Dennis, L., Deur, A., Dhamija, S., Dharmawardane, K.V., Dhuga, K.S., Dickson, R., Djalali, C., Dodge, G.E., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., Egiyan, K.S., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fatemi, R., Fedotov, G., Feuerbach, R.J., Ficenec, J., Forest, T.A., Fradi, A., Funsten, H., Gavalian, G., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Gordon, C.I.O., Gothe, R.W., Graham, L., Griffioen, K.A., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hanretty, C., Hardie, J., Hassall, N., Heddle, D., F.W. Hersman, §, Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Ito, M.M., Jenkins, D., Jo, H.S., Johnstone, J.R., Joo, K., Juengst, H.G., Kalantarians, N., Keller, D., Kellie, J.D., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuhn, S.E., Kuleshov, S.V., Kuznetsov, V., Lachniet, J., Langheinrich, J., Lawrence, D., Li, Ji, Livingston, K., Lu, H.Y., MacCormick, M., Marchand, C., Markov, N., Mattione, P., McAleer, S., Mckinnon, B., McNabb, J.W.C., Mecking, B.A., Mehrabyan, S., Melone, J.J., Mestayer, M.D., Meyer, C.A., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Moreno, B., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G.S., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Osipenko, M., Ostrovidov, A.I., Park, K., Park, S., Pasyuk, E., Paterson, C., Anefalos Pereira, S., Philips, S.A., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Popa, I., Pozdniakov, S., Preedom, B.M., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Qin, L.M., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salamanca, J., Salgado, C., Sapunenko, V., Schott, D., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Sharov, D., Shvedunov, N.V., Skabelin, A.V., Smith, L.C., Sober, D.I., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Tedeschi, D.J., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Watts, D.P., Weinstein, L.B., Weygand, D.P., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Yurov, M., Zana, L., Zhang, J., Zhao, B., Zhao, Z.W., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), 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 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: High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 13.60.Le, 12.40.Nn, 12.40.Vv, 25.30.Rw
Abstract: To be submitted to Phys Rev C, 15 pages, 18 figures; International audience; Electroproduction of exclusive $\phi$ vector mesons has been studied with the CLAS detector in the kinematical range $1.6\leq Q^2\leq 3.8$ GeV$^{2}$, $0.0\leq t^{\prime}\leq 3.6$ GeV$^{2}$, and $2.0\leq W\leq 3.0$ GeV. The scaling exponent for the total cross section as $1/(Q^2+M_{\phi}^2)^n$ was determined to be $n=2.49\pm 0.33$. The slope of the four-momentum transfer $t'$ distribution is $b_{\phi}=0.98 \pm 0.17$ GeV$^{-2}$. The data are consistent with the assumption of s-channel helicity conservation (SCHC). Under this assumption, we determine the ratio of longitudinal to transverse cross sections to be $R=0.86 \pm 0.24$. A 2-gluon exchange model is able to reproduce the main features of the data.
Published: 2008

30. Ratios of (15)N/(12)C and (4)He/(12)C inclusive electroproduction cross sections in the nucleon resonance region

Author: Bosted, Pe, Fersch, R, Adams, G, Amarian, M, Anefalos Pereira Sergio, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Ultmann, Sbr, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes, A, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, De Vita Raffaella, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dharmawardane, Kv, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Forest, Ta, Fradi, A, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, E, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, C, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Li, J, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salgado, C, Santoro, Jp, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Tkabladze, A, Tkachenko, S, Todor, L, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams, M, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., 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), Thomas Jefferson National Accelerator Facility (Jefferson Lab), 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: ELECTRON-SCATTERING, DEPENDENCE, CLAS, 25.30.Fj,13.60.Hb,27.20.+n, QUARK-HADRON DUALITY, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], QUARK-HADRON DUALITY, ELECTRON-SCATTERING, DEPENDENCE, CLAS, Nuclear Experiment
Abstract: The (W,Q2)-dependence of the ratio of inclusive electron scattering cross sections for 15N/12C was determined in the kinematic range 0.8, Comment: 13 pages, 2 figures. Significantly shortened version. Results unchanged. Small additions for Phys. Rev. C
Published: 2008

31. Cross sections and beam asymmetries for $\vev{e}p \to en\pi^+$ in the nucleon resonance region for $1.7 \le Q^2 \le 4.5 (GeV)^2$

Author: Park, K., Burkert, V.D., Kim, W., Aznauryan, I.G., Minehart, R., Smith, L.C., Joo, K., Elouadrhiri, L., Adams, G., Amaryan, M.J., Ambrozewicz, P., Anghinol_, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J.P., Baltzell, N.A., Barrow, S., Batourine, V., Battaglieri, M., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B.L., Biselli, A.S., Blaszczyk, L., Bonner, B.E., Bookwalter, C., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., Bultmann, S., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carman, D.S., Casey, L., Cazes, A., Chen, Si, Cheng, L., Cole, P.L., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crede, V., Cummings, J.P., Dale, D., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P.V., Denizli, H., Dennis, L., Deur, A., Dhamija, S., Dharmawardane, K.V., Dhuga, K.S., Dickson, R., Djalali, C., Dodge, G.E., Donnelly, J., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., Egiyan, K.S., El Fassi, L., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Feuerbach, R.J., Forest, T.A., Fradi, A., Funsten, H., Gabrielyan, M.Y., Garcon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gohn, W., Golovatch, E., Gonenc, A., Gordon, C.I.O., Gothe, R.W., Graham, L., Grioen, K.A., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hadi, K., Hafnaoui, K., Hakobyan, H., Hakobyan, R.S., Hanretty, C., Hardie, J., Hassall, N., Heddle, D., Hersman, F.W., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Ito, M.M., Jenkins, D., Jo, H.S., Johnstone, J.R., Juengst, H.G., Kalantarians, N., Keller, D., Kellie, J.D., Khandaker, M., Kim, K.Y., Klein, A., Klein, F.J., Klimenko, A.V., Klusman, M., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuhn, S.E., Kuleshov, S.V., Kuznetsov, V., Lachniet, J., Laget, J.M., Langheinrich, J., Lawrence, D., Lee, T., Li, Ji, Lima, A.C.S., Livingston, K., Lu, H.Y., Lukashin, K., MacCormick, M., Markov, N., Mattione, P., McAleer, S., Mckinnon, B., McNabb, J.W.C., Mecking, B.A., Mehrabyan, S., Melone, J.J., Mestayer, M.D., Meyer, C.A., Mibe, T., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Moreno, B., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G.S., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Osipenko, M., Ostrovidov, A.I., Park, S., Pasyuk, E., Paterson, C., Anefalos Pereira, S., Philips, S.A., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Popa, I., Pozdniakov, S., Preedom, B.M., Price, J.W., Prok, Y., Protopopescu, D., Qin, L.M., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rosner, G., Rossi, P., Rowntree, D., Rubin, P.D., Sabatie, F., Saini, M.S., Salamanca, J., Salgado, C., Santoro, J.P., Sapunenko, V., Schott, D., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Sharov, D., Shaw, J., Shvedunov, N.V., Skabelin, A.V., Smith, E.S., Sober, D.I., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strakovsky, I.I., Strauch, S., Suleiman, R., Taiuti, M., Takeuchi, T., Tedeschi, D.J., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Watts, D.P., Weinstein, L.B., Weygand, D.P., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Yurov, M., Zana, L., Zhang, B., Zhang, J., Zhao, B., Zhao, Z.W., 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 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), 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: High Energy Physics - Phenomenology, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, High Energy Physics - Experiment
Abstract: The exclusive electroproduction process $\vec{e}p \to e^\prime n \pi^+$ was measured in the range of the photon virtuality $Q^2 = 1.7 - 4.5 \rm{GeV^2}$, and the invariant mass range for the $n\pi^+$ system of $W = 1.15 - 1.7 \rm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive $\pi^+$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n\pi^+$ center-of-mass system. The $n\pi^+$ channel has particular sensitivity to the isospin 1/2 excited nucleon states, and together with the $p\pi^0$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the $\sigma_{LT'}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
Published: 2007

32. Cross Sections for the $\gamma p \to K^{*0}\Sigma^+$ Reaction at $E_\gamma = 1.7 - 3.0$ GeV

Author: Hleiqawi, I., Hicks, K., Carman, D., Mibe, T., Niculescu, G., Tkabladze, A., Amarian, M., Ambrozewicz, P., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J.P., Baltzell, N.A., Batourine, V., Battaglieri, M., Beard, K., Bedlinskiy, I., Bellis, M., Benmouna, N., Berman, B.L., Biselli, A.S., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., Bültmann, S., Burkert, V.D., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carnahan, B., Chen, Si, Cole, P.L., Collins, P., Coltharp, P., Crabb, D., Crannell, H., Crede, V., Cummings, J.P., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P.V., Dennis, L., Deur, A., Djalali, C., Dickson, R., Dodge, G.E., Donnelly, J., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., Elouadrhiri, L., Eugenio, P., Fedotov, G., Feldman, G., Fersch, R., Feuerbach, R., Garçon, M., Gavalian, G., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gonenc, A., Gothe, R.W., Griffioen, K.A., Guidal, M., Guler, N., Guo, L., Gyurjyan, V., Hakobyan, R.S., Hardie, J., Heddle, D., Hersman, F.W., Holtrop, M., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Ito, M.M., Jenkins, D., Jo, H.S., Joo, K., H.G. Juengst, 9, Kalantarians, N., Kellie, J.D., Khandaker, M., Kim, K., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuhn, S.E., Kuleshov, S.V., Lachniet, J., Laget, J.M., Langheinrich, J., Lawrence, D., Li, J., Livingston, K., Lu, H., Lukashin, K., MacCormick, M., McAleer, S., Mckinnon, B., Mcnabb, J., Mecking, B.A., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Moriya, K., Morrow, S.A., Moteabbed, M., Mutchler, G.S., Munevar, E., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., Osipenko, M., Ostrovidov, A.I., Park, K., Pasyuk, E., Paterson, C., Pierce, J., Pivnyuk, N., Pogorelko, O., Pozdniakov, S., B. Preedom, 19, Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Santoro, J.P., Sapunenko, V., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Smith, E.S., Smith, L.C., Sober, D.I., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Taylor, S., Tedeschi, D.J., Thoma, U., Thompson, R., Todor, L., Tkachenko, S., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Wang, K., Weinstein, L.B., Weygand, D.P., Whisnant, S., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Zana, L., Zhang, J., Zhao, B., Zhao, Z., 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 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), 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: High Energy Physics::Experiment, 13.60.-r,13.60.Le,13.60.Rj,14.40.Ev, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
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., Comment: 7 pages, 5 figures, submitted to Phys. Rev. C (Rapid Commun.)
Published: 2007

33. CASCADE PRODUCTION IN THE REACTIONS GAMMA P ---> K+ K+ (X) AND GAMMA P ---> K+ K+ PI- (X)

Author: Guo, L, Weygand, Dp, Battaglieri, Marco, De Vita Raffaella, Kubarovsky, V, Stoler, P, Amaryan, Mj, Ambrozewicz, P, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Batourine, V, Bedlinskiy, I, Bellis, M, Benmouna, N, Berman, Bl, Biselli, As, Blaszczyk, L, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, Wj, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, Dashyan, N, De Masi, R, De Sanctis Enzo, Degtyarenko, Pv, Deur, A, Dharmawardane, Kv, Dickson, R, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dugger, M, Dzyubak, Op, Egiyan, H, Egiyan, Ks, El Fassi, L, Elouadrhiri, L, Eugenio, P, Fedotov, G, Feldman, Gerald, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Gonenc, A, Gordon, Cio, Gothe, Rw, Griffioen, Ka, Guidal, M, Guler, N, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, H, Hakobyan, Rs, Hanretty, C, Hardie, J, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Johnstone, R, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Kellie, Jd, Khandaker, M, Kim, W, Klein, A, Klein, Fj, Klimenko, Av, Kossov, M, Krahn, Z, Kramer, Lh, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Lee, T, Jun, Li, Livingston, K, Lu, Hy, Maccormick, M, Markov, N, Mattione, P, Mckinnon, B, Mecking, Ba, Melone, Jj, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Moriya, K, Morrow, Sa, Moteabbed, M, Munevar, E, Mutchler, Gs, Nadel Turonski, P, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Anefalos Pereira Sergio, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Pozdniakov, S, Price, Jw, Prok, Y, Protopopescu, D, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Sabatie, F, Salamanca, J, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Sharov, D, Shvedunov, Nv, Smith, Es, Smith, Lc, Sober, Di, Sokhan, D, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Tedeschi, Dj, Thoma, U, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Watts, Dp, Weinstein, Lb, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Zana, L, Zhang, J, Zhao, B, Zhao, Zw, 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 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), 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: ENERGY, BARYONS, RANGE, CLAS, 13.60.Rj, 12.40.Yx, 14.20.Jn, 25.20.Lj, JLAB, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], MASS, RESONANCE, Nuclear Experiment, INCLUSIVE PHOTOPRODUCTION, INCLUSIVE PHOTOPRODUCTION, CLAS, ENERGY, SYSTEM, MASS, RESONANCE, BARYONS, RANGE, JLAB, SYSTEM
Abstract: Photoproduction of the cascade resonances has been investigated in the reactions $\gamma p \to K^+ K^+ (X)$ and $\gamma p \to K^+ K^+ \pi^- (X)$. The mass split of the $\Xi$ doublet is measured to be $5.4\pm 1.8$ MeV/c$^2$, consistent with existing measurements. The differential (total) cross sections for the $\Xi^{-}$ have been determined for photon beam energies from 2.75 to 3.85 (4.75) GeV, and are consistent with a possible production mechanism of $Y^*\to K^+\Xi^-$ through a $t$-channel process. The reaction $\gamma p \to K^+ K^+ \pi^-[\Xi^0]$ has also been investigated in search of excited cascade resonances. No significant signal of excited cascade states other than the $\Xi^-(1530)$ is observed. The cross section results of the $\Xi^-(1530)$ have also been obtained for photon beam energies from 3.35 to 4.75 GeV., Comment: 10 pages, 10 figures
Published: 2007

34. First Measurement of Beam-Recoil Observables $C_x$ and $C_z$ in Hyperon Photoproduction

Author: Bradford, Rk, Schumacher, Ra, Adams, G, Amaryan, Mj, Ambrozewicz, P, Anciant, E, Anghinolfi, Marco, Asavapibhop, B, Asryan, G, Audit, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Bianchi, Nicola, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Branford, D, Briscoe, Wj, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Chen, S, Cole, Pl, Coleman, A, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, De Sanctis Enzo, De Vita Raffaella, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Dharmawardane, Kv, Dickson, R, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, El Fassi, L, Elouadrhiri, L, Empl, A, Eugenio, P, Fatemi, R, Fedotov, G, Feldman, Gerald, Feuerbach, Rj, Forest, Ta, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, H, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hu, J, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Kalantarians, N, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Lima, Acs, Livingston, K, Lu, Hy, Lukashin, K, Maccormick, M, Manak, Jj, Marchand, C, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Mirazita, Marco, Miskimen, R, Mokeev, V, Moriya, K, Morrow, Sa, Moteabbed, M, Muccifora, Valeria, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Natasha, N, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Popa, I, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Quinn, Bp, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salamanca, J, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Serov, Vs, Shafi, A, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Simionatto, S, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Sokhan, D, Spraker, M, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Wang, K, Watts, Dp, Weinstein, Lb, Weller, H, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Zw, 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), 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 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: POLARIZATION, BREMSSTRAHLUNG, PSEUDOSCALAR MESON PHOTOPRODUCTION, PHOTON ENERGIES, KAON PHOTOPRODUCTION, POLARIZATION, RESONANCES, SPIN, P(GAMMA, LAMBDA, BREMSSTRAHLUNG, K&LAMBDA, FOS: Physical sciences, P(GAMMA, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LAMBDA, PSEUDOSCALAR MESON PHOTOPRODUCTION, SPIN, K&LAMBDA, PHOTON ENERGIES, 25.20.Lj, 13.40.-f, 13.60.Le, 14.20.Gk, KAON PHOTOPRODUCTION, Nuclear Experiment (nucl-ex), Nuclear Experiment, RESONANCES
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, Comment: 28 pages, 18 figures, Submitted to Physical Review C
Published: 2007

35. Experimental study of exclusive $^2$H$(e,e^\prime p)n$ reaction mechanisms at high $Q^2$

Author: Egiyan, K.S., Asryan, G., Gevorgyan, N., Griffioen, K.A., Laget, J.M., Kuhn, S.E., Adams, G., Amaryan, M.J., Ambrozewicz, P., Anghinolfi, M., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J.P., Baltzell, N.A., Barrow, S., Batourine, V., Battaglieri, M., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B.L., Biselli, A.S., Blaszczyk, L., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W.J., Brooks, W.K., Bültmann, S., Burkert, V.D., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carman, D.S., Cazes, A., Chen, Si, Cole, P.L., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crede, V., Cummings, J.P., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P.V., Denizli, H., Dennis, L., Deur, A., Dharmawardane, K.V., Dickson, R., Djalali, C., Dodge, G.E., Donnelly, J., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O.P., Egiyan, H., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Feuerbach, R.J., Fersch, R., Garçon, M., Gavalian, G., Gilfoyle, G.P., Giovanetti, K.L., Girod, F.X., Goetz, J.T., Gonenc, A., Gordon, C.I.O., Gothe, R.W., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hakobyan, R.S., Hanretty, C., Hardie, J., Hersman, F.W., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Ito, M.M., Jenkins, D., Jo, H.S., Joo, K., Juengst, H.G., Kalantarians, N., Kellie, J.D., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Kossov, M., Krahn, Z., Kramer, L.H., Kubarovsky, V., Kuhn, J., Kuleshov, S.V., Lachniet, J., Langheinrich, J., Lawrence, D., Li, Ji, Livingston, K., Lu, H.Y., MacCormick, M., Marchand, C., Markov, N., Mattione, P., McAleer, S., Mckinnon, B., McNabb, J.W.C., Mecking, B.A., Mehrabyan, S., Melone, J.J., Mestayer, M.D., Meyer, C.A., Mibe, T., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Mokeev, V., Moriya, K., Morrow, S.A., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G.S., Nadel-Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niroula, M.R., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Osipenko, M., Ostrovidov, A.I., Park, K., Pasyuk, E., Paterson, C., Anefalos Pereira, S., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Pozdniakov, S., Preedom, B.M., Price, J.W., Prok, Y., Protopopescu, D., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rosner, G., Rossi, P., Sabatié, F., Salamanca, J., Salgado, C., Santoro, J.P., Sapunenko, V., Schumacher, R.A., Serov, V.S., Sharabian, Y.G., Shvedunov, N.V., Skabelin, A.V., Smith, E.S., Smith, L.C., Sober, D.I., Sokhan, D., Stavinsky, A., Stepanyan, S.S., Stepanyan, S., Stokes, B.E., Stoler, P., Strauch, S., Taiuti, M., Tedeschi, D.J., Thoma, U., Tkabladze, A., Tkachenko, S., Todor, L., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Watts, D.P., Weinstein, L.B., Weygand, D.P., Williams, M., Wolin, E., Wood, M.H., Yegneswaran, A., Zana, L., Zhang, J., Zhao, B., Zhao, Z.W., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: 25.10.+s, 25.30.Fj, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The reaction $^2$H$(e,e^\prime p)n$ has been studied with full kinematic coverage for photon virtuality $1.75, Comment: 6 pages, 4 figures
Published: 2007

36. Single pi+ Electroproduction on the Proton in the First and Second Resonance Regions at 0.25GeV^2 < Q^2 < 0.65GeV^2 Using CLAS

Author: Egiyan, H., Aznauryan, I.G., Burkert, V.D., Griffioen, K.A., Joo, K., Minehart, R., Smith, L.C., Adams, G., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Ball, J.P., Baltzel, N., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bellis, M., Benmouna, N., Bianchi, N., S. Biselli, A., Boiarinov, S., Bonner, B.E., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W.J., K. Brooks, W., Butuceanu, C., Calarco, J.R., Careccia, S.L., Carman, D.S., Carnahan, B., Cetina, C., Chen, Si, Cole, P.L., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., Cummings, J.P., DeSanctis, E., Devita, R., Degtyarenko, P.V., Denizli, H., Dennis, L., Dharmawardane, K.V., Djalali, C., Dodge, G.E., Donnely, J., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Dzyubak, O.P., Eckhause, M., Egiyan, K.S., Elouadrhiri, L., Empl, A., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., Feuerbach, R.J., Forest, T.A., Funsten, H., Gaff, S.J., Gai, M., Gavalian, G., Gilad, S., Gilfoyle, G.P., Giovanetti, K.L., Girard, Pascal, Goetz, G.T., Gordon, C.I.O., Gothe, R., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hakobyan, R.S., Hardie, J., Heddle, D., Hersman, F.W., Hicks, K., Hicks, R.S., Hleiqawi, I., Holtrop, M., Hu, J., Hyde-Wright, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B., Ito, M.M., Jenkins, D., Juengst, H.G., Kelley, J.H., Kellie, J.D., Khandaker, M., Kim, D.H., Kim, K.Y., Kim, K., Kim, M.S., Kim, W., Klein, A., Klein, F.J., Klimenko, A.V., Klusman, M., Kossov, M., Kramer, L.H., Kuang, Y., Kubarovsky, V., Kuhn, S.E., Kuhn, J., Lachniet, J., Laget, J.M., Langheinrich, J., Lawrence, D., Li, Ji, Livingston, K., Longhi, A., Lukashin, K., Manak, J.J., Marchand, C., McAleer, S., Mckinnon, B., McNabb, J.W.C., Mecking, B.A., Mehrabyan, S., Melone, J.J., Mestayer, M.D., Meyer, C.A., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Morrow, S.A., Muccifora, V., Mueller, J., Murphy, L.Y., Mutchler, G.S., Napolitano, J., Nasseripour, R., Nelson, S.O., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B.B., Niyazov, R.A., Nozar, M., O'Rielly, G.V., Osipenko, M., Park, K., Pasyuk, E., Peterson, G., Philips, S.A., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B.M., Price, J.W., Prok, Y., Protopopescu, D., Qin, L.M., Raue, B.A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B.G., Ronchetti, F., Rosner, G., Rossi, P., Rowntree, D., Rubin, P.D., Sabatié, F., Sabourov, K., Salgado, C., Santoro, J.P., Sapunenko, V., Sargsyan, M., Schumacher, R.A., Serov, V.S., Shafi, A., Sharabian, Y.G., Shaw, J., Simionatto, S., Skabelin, A.V., Smith, E.S., Sober, D.I., Spraker, M., Stavinsky, A., Stepanyan, S., Stoler, P., Strakovsky, I.I., Strauch, S., Taiuti, M., Taylor, S., Tedeschi, D.J., Thoma, U., Thompson, R., Tkabladze, A., Todor, L., Tur, C., Ungaro, M., Vineyard, M.F., Vlassov, A.V., Wang, K., Weinstein, L.B., Weller, H., Weygand, D.P., Whisnant, C.S., Wolin, E., Wood, M.H., Yegneswaran, A., Yun, J., Zhang, J., Zhao, J., Zhou, Z., 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: electron-proton interactions, PI, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], MESONS, Q2, MODEL, CLAS, NUCLEON, MODEL, PI, SCATTERING, MESONS, SYSTEM, Q2, CLAS, structure functions, SCATTERING, High Energy Physics::Experiment, hadron electroproduction, 13.60.Rj, 14.20.Dh, 25.30.Rw, NUCLEON, Nuclear Experiment, SYSTEM
Abstract: The ep -> e'pi^+n reaction was studied in the first and second nucleon resonance regions in the 0.25 GeV^2 < Q^2 < 0.65 GeV^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_TL, sigma_TT and the linear combination sigma_T+epsilon*sigma_L were extracted by fitting the phi-dependence of the measured cross sections, and were compared to the MAID and Sato-Lee models., Comment: Accepted for publication in PRC
Published: 2006

37. Quark-Hadron Duality in Spin Structure Functions g1p and g1d

Author: Bosted, Pe, Dharmawardane, Kv, Dodge, Ge, Forest, Ta, Kuhn, Se, Prok, Y, Adams, G, Amarian, M, Ambrozewicz, P, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes Antoine Jacques, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, Devita, R, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, Evgueni, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Jun, Li, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Manak, Jj, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., 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 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), 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: RESONANCE-REGION, LOCAL DUALITY, FORM-FACTORS, SCATTERING, NUCLEON, TARGET, ELECTROPRODUCTION, ASYMMETRY, BEHAVIOR, PROTON, FORM-FACTORS, 13.60.Hb, 25.30.Fj, 24.30.Gd, ELECTROPRODUCTION, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], LOCAL DUALITY, PROTON, High Energy Physics - Phenomenology, TARGET, High Energy Physics - Phenomenology (hep-ph), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], RESONANCE-REGION, ASYMMETRY, SCATTERING, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), NUCLEON, Nuclear Experiment, BEHAVIOR
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 (W1.7 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., 15 pages, 3 figures
Published: 2006
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38. Measurement of the Polarized Structure Function $\sigma_{LT^\prime}$ for Pion Electroproduction in the Roper Resonance Region

Author: Joo, K, Smith, Lc, Aznauryan, Ig, Burkert, Vd, Egiyan, H, Minehart, R, Adams, G, Ambrozewicz, P, Anciant, E, Anghinolfi, Marco, Asavapibhop, B, Asryan, G, Audit, G, Auger, T, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Berman, Bl, Bianchi, Nicola, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Briscoe, Wj, Brooks, Wk, Bueltmann, S, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cetina, C, Chen, S, Cole, Pl, Coleman, A, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Cummings, Jp, De Sanctis Enzo, Devita, R, Degtyarenko, Pv, Dennis, L, Deur, A, Dharmawardane, Kv, Dhuga, Ks, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Dragovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, Ks, Elouadrhiri, L, Empl, A, Eugenio, P, Farhi, L, Fatemi, R, Fedotov, G, Feldman, Gerald, Feuerbach, Rj, Forest, Ta, Frolov, V, Funsten, H, Gaff, Sj, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girard, P, Girod, Fx, Goetz, Jt, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Hu, J, Hyde Wright CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Ito, Mm, Jenkins, D, Jo, Hs, Juengst, Hg, Kelley, Jh, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klimenko, Av, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuhn, Se, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Lee, T, Livingston, K, Lukashin, K, Manak, Jj, Marchand, C, Maximon, Lc, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mikhailov, K, Mirazita, Marco, Miskimen, R, Mokeev, V, Morrow, Sa, Muccifora, Valeria, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Nelson, So, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Peterson, G, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Prok, Y, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, F, Sabourov, K, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Shafi, A, Sharabian, Yg, Shaw, J, Simionatto, S, Skabelin, Av, Smith, Es, Sober, Di, Spraker, M, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Wang, K, Weinstein, Lb, Weller, H, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J., 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: BARYONS, MODEL, BARYONS, MODEL, High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The polarized longitudinal-transverse structure function $\sigma_{LT^\prime}$ measures the interference between real and imaginary amplitudes in pion electroproduction and can be used to probe the coupling between resonant and non-resonant processes. We report new measurements of $\sigma_{LT^\prime}$ in the $N(1440){1/2}^+$ (Roper) resonance region at $Q^2=0.40$ and 0.65 GeV$^2$ for both the $\pi^0 p$ and $\pi^+ n$ 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 $\sigma_{LT^\prime}(\pi^+ n)$ channel shows a large sensitivity to the Roper resonance multipoles $M_{1-}$ and $S_{1-}$ and provides new constraints on models of resonance formation., Comment: 5 pages, 3 figures. Revised manuscript accepted by Physical Review C (Brief Report)
Published: 2005

39. Measurement of the Polarized Structure Function $\sigma_{LT^\prime}$ for $p(\vec{e},e'\pi^+)n$ in the $\Delta(1232)$ Resonance Region

Author: Joo, K., C. Smith, L., G. Aznauryan, I., D. Burkert, V., Minehart, R., Adams, G., Ambrozewicz, P., Anciant, E., Anghinolfi, M., Asavapibhop, B., Asryan, G., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., P. Ball, J., Barrow, S., Batourine, V., Battaglieri, M., Beard, K., Bektasoglu, M., Benmouna, N., Bianchi, N., S. Biselli, A., Boiarinov, S., E. Bonner, B., Bouchigny, S., Bradford, R., Branford, D., J. Briscoe, W., K. Brooks, W., Bültmann, S., Butuceanu, C., R. Calarco, J., S. Carman, D., Carnahan, B., Cetina, C., Chen, Si, Ciciani, L., L. Cole, P., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., P. Cummings, J., De Sanctis, E., Devita, R., V. Degtyarenko, P., Dennis, L., Deur, A., V. Dharmawardane, K., S. Dhuga, K., Djalali, C., E. Dodge, G., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., P. Dzyubak, O., Egiyan, H., S. Egiyan, K., Elouadrhiri, L., Empl, A., Eugenio, P., Fersch, R., J. Feuerbach, R., Forest, T.A., Funsten, H., J. Gaff, S., Garçon, M., Gavalian, G., Gilad, S., P. Gilfoyle, G., L. Giovanetti, K., W. Gothe, R., A. Griffioen, K., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., S. Hakobyan, R., Hardie, J., Heddle, D., W. Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., Hu, J., E. Hyde-Wright, C., Ilieva, Y., Ireland, D., M. Ito, M., Jenkins, D., G. Juengst, H., D. Kellie, J., H. Kelley, J., Khandaker, M., Y. Kim, K., Kim, K., Kim, W., Klein, A., J. Klein, F., V. Klimenko, A., Klusman, M., Kossov, M., Koubarovski, V., H. Kramer, L., E. Kuhn, S., Kuhn, J., Lachniet, J., M. Laget, J., Langheinrich, J., Lawrence, D., Lee, T., Livingston, K., Lukashin, K., Manak, J.J., Marchand, C., McAleer, S., W. C. Mcnabb, J., A. Mecking, B., D. Mestayer, M., Meyer, C.A., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Morrow, S.A., Muccifora, V., Mueller, J., S. Mutchler, G., Napolitano, J., Nasseripour, R., O. Nelson, S., Niccolai, S., Niculescu, G., Niculescu, I., B. Niczyporuk, B., A. Niyazov, R., Nozar, M., V. O'Rielly, G., Osipenko, M., I. Ostrovidov, A., Park, K., Pasyuk, E., Peterson, G., Philips, S.A., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., M. Preedom, B., W. Price, J., Prok, Y., Protopopescu, D., M. Qin, L., A. Raue, B., Riccardi, G., Ricco, G., Ripani, M., G. Ritchie, B., Ronchetti, F., Rosner, G., Rossi, P., Rowntree, D., D. Rubin, P., Sabatié, F., Sabourov, K., Salgado, C., P. Santoro, J., Sapunenko, V., A. Schumacher, R., S. Serov, V., G. Sharabian, Y., Shaw, J., Simionatto, S., V. Skabelin, A., S. Smith, E., I. Sober, D., Spraker, M., Stavinsky, A., Stepanyan, S., Stepanyan, S.S., E. Stokes, B., Stoler, P., I. Strakovsky, I., Strauch, S., Taiuti, M., Taylor, S., J. Tedeschi, D., Thoma, U., Thompson, R., Tkabladze, A., Todor, L., Tur, C., Ungaro, M., F. Vineyard, M., V. Vlassov, A., Wang, K., B. Weinstein, L., Weller, H., P. Weygand, D., Williams, M., Wolin, E., H. Wood, M., Yegneswaran, A., Yun, J., Zana, L., 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: 3.60.Le, 12.40.Nn, 13.40.Gp, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract: The polarized longitudinal-transverse structure function $\sigma_{LT^\prime}$ has been measured using the $p(\vec e,e'\pi^+)n$ reaction in the $\Delta(1232)$ resonance region at $Q^2=0.40$ and 0.65 GeV$^2$. No previous $\sigma_{LT^\prime}$ data exist for this reaction channel. The kinematically complete experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS) using longitudinally polarized electrons at an energy of 1.515 GeV. A partial wave analysis of the data shows generally better agreement with recent phenomenological models of pion electroproduction compared to the previously measured $\pi^0 p$ channel. A fit to both $\pi^0 p$ and $\pi^+ n$ channels using a unitary isobar model suggests the unitarized Born terms provide a consistent description of the non-resonant background. The $t$-channel pion pole term is important in the $\pi^0 p$ channel through a rescattering correction, which could be model-dependent., Comment: 6 pages, LaTex, 5 eps figures: Submitted to PRC/Brief Reports v2: Updated reference
Published: 2004

40. Complete measurement of three-body photodisintegration of $^{3}He$ for photon energies between 0.35 and 1.55 GeV

Author: Niccolai, S., Audit, G., L. Berman, B., M. Laget, J., Strauch, S., Adams, G., Afanasev, A., Ambrozewicz, P., Anghinolfi, M., R. M. Annand, J., Armstrong, C., Asavapibhop, B., Avakian, H., Bagdasaryan, H., P. Ball, J., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bellis, M., Benmouna, N., Bianchi, N., S. Biselli, A., Boiarinov, S., E. Bonner, B., Bouchigny, S., Bradford, R., Branford, D., J. Briscoe, W., K. Brooks, W., D. Burkert, V., Butuceanu, C., R. Calarco, J., S. Carman, D., Carnahan, B., Chen, Si, L. Cole, P., Coleman, A., Cords, D., Corvisiero, P., Crabb, D., Crannell, H., P. Cummings, J., De Sanctis, E., Devita, R., V. Degtyarenko, P., Denizli, H., Dennis, L., V. Dharmawardane, K., S. Dhuga, K., Djalali, C., E. Dodge, G., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., P. Dzyubak, O., Egiyan, H., S. Egiyan, K., Elouadrhiri, L., Empl, A., Ent, R., Eugenio, P., Fatemi, R., Fedotov, G., Feldman, G., J. Feuerbach, R., Ficenec, J., Forest, T.A., Funsten, H., Gavalian, G., P. Gilfoyle, G., L. Giovanetti, K., Golovatch, E., I. O. Gordon, C., W. Gothe, R., Griffioen, K., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., S. Hakobyan, R., Hardie, J., Heddle, D., Heimberg, P., W. Hersman, F., Hicks, K., Hleiqawi, K., Holtrop, M., Hu, J., Huertas, M., E. Hyde-Wright, C., Llieva, Y.Y., Ireland, D., M. Ito, M., Jenkins, D., S. Jo, H., Joo, K., G. Juengst, H., Kellie, J., Khandaker, M., Y. Kim, K., Kim, K., Kim, W., Klein, A., J. Klein, F., V. Klimenko, A., Klusman, M., Kossov, M., H. Kramer, L., Kuang, Y., E. Kuhn, S., Kuhn, J., Lachniet, J., Langheinrich, J., Lawrence, D., Li, Ji, C. S. Lima, A., Livingston, K., Lukashin, K., Manak, J.J., Marchand, C., McAleer, S., W. C. Mcnabb, J., A. Mecking, B., Melone, J.J., D. Mestayer, M., Meyer, C.A., Mikhailov, K., Minehart, R., Mirazita, M., Miskimen, R., Morand, L., Morrow, S.A., Muccifora, V., Mueller, J., Y. Murphy, L., S. Mutchler, G., Napolitano, J., Naseripour, R., Niculescu, G., Niculescu, I., B. Niczyporuk, B., A. Niyazov, R., Nozar, M., T. O'Brien, J., V. O'Rielly, G., Osipenko, M., Ostrovidov, A., Park, K., Pasyuk, E., Philips, S.A., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Popa, I., Pozdniakov, S., M. Preedom, B., W. Price, J., Prok, Y., Protopopescu, D., M. Qin, L., A. Raue, B., Riccardi, G., Ricco, G., Ripani, M., G. Ritchie, B., Ronchetti, F., Rosner, G., Rossi, P., Rowntree, D., D. Rubin, P., Sabatié, F., Salgado, C., P. Santoro, J., Sapunenko, V., A. Schumacher, R., S. Serov, V., Shafi, A., G. Sharabian, Y., Shaw, J., V. Skabelin, A., S. Smith, E., C. Smith, L., I. Sober, D., Stavinsky, A., Stepanyan, S., Stoler, P., I. Strakovsky, I., Suleiman, R., Taiuti, M., Taylor, S., J. Tedeschi, D., Thoma, U., Thompson, R., Tkabladze, R., Todor, L., Tur, C., Ungaro, M., F. Vineyard, M., V. Vlassov, A., Wang, K., B. Weinstein, L., P. Weygand, D., S. Whisnant, C., Williams, M., Wolin, E., H. Wood, M., Yegneswaran, A., Yun, J., Zana, L., 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: NUCLEI, PION-PHOTOPRODUCTION, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FEW-BODY SYSTEMS, PION-PHOTOPRODUCTION, EXCHANGE MECHANISMS, MOMENTUM, HE-3(GAMMA, PP)N, ABSORPTION, NUCLEI, MOMENTUM, 21.45.+v, 25.20.-x, FEW-BODY SYSTEMS, ABSORPTION, EXCHANGE MECHANISMS, PP)N, High Energy Physics::Experiment, HE-3(GAMMA, Nuclear Experiment, Nuclear Physics
Abstract: PHASE; 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

41. Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

Author: Dharmawardane, Kv, Kuhn, Se, Bosted, P, Prok, Y, Adams, G, Ambrozewicz, P, Anghinolfi, Marco, Asryan, G, Avakian, H, Bagdasaryan, H, Baillie, N, Ball, Jp, Baltzell, Na, Barrow, S, Batourine, V, Battaglieri, Marco, Beard, K, Bedlinskiy, I, Bektasoglu, M, Bellis, M, Benmouna, N, Biselli, As, Bonner, Be, Bouchigny, S, Boiarinov, S, Bradford, R, Branford, D, Brooks, Wk, Bultmann, S, Burkert, Vd, Butuceanu, C, Calarco, Jr, Careccia, Sl, Carman, Ds, Carnahan, B, Cazes Antoine Jacques, Chen, S, Cole, Pl, Collins, P, Coltharp, P, Cords, D, Corvisiero, Pietro, Crabb, D, Crannell, H, Crede, V, Cummings, Jp, De Masi, R, Devita, R, De Sanctis Enzo, Degtyarenko, Pv, Denizli, H, Dennis, L, Deur, A, Djalali, C, Dodge, Ge, Donnelly, J, Doughty, D, Draigovitsch, P, Dugger, M, Dytman, S, Dzyubak, Op, Egiyan, H, Egiyan, Ks, Elouadrhiri, L, Eugenio, P, Fatemi, R, Fedotov, G, Feuerbach, Rj, Forest, Ta, Funsten, H, Garcon, M, Gavalian, G, Gilfoyle, Gp, Giovanetti, Kl, Girod, Fx, Goetz, Jt, Golovatch, Evgueni, Gonenc, A, Gothe, Rw, Griffioen, Ka, Guidal, M, Guillo, M, Guler, N, Guo, L, Gyurjyan, V, Hadjidakis, Cynthia, Hafidi, K, Hakobyan, Rs, Hardie, J, Heddle, D, Hersman, Fw, Hicks, K, Hleiqawi, I, Holtrop, M, Huertas, M, Hyde Wriyht CE, Ilieva, Y, Ireland, Dg, Ishkhanov, Bs, Isupov, El, Ito, Mm, Jenkins, D, Jo, Hs, Joo, K, Juengst, Hg, Keith, C, Kellie, Jd, Khandaker, M, Kim, Ky, Kim, K, Kim, W, Klein, A, Klein, Fj, Klusman, M, Kossov, M, Kramer, Lh, Kubarovsky, V, Kuhn, J, Kuleshov, Sv, Lachniet, J, Laget, Jm, Langheinrich, J, Lawrence, D, Jun, Li, Lima, Acs, Livingston, K, Lu, H, Lukashin, K, Maccormick, M, Manak, Jj, Markov, N, Mcaleer, S, Mckinnon, B, Mcnabb, Jwc, Mecking, Ba, Mestayer, Md, Meyer, Ca, Mibe, T, Mikhailov, K, Minehart, R, Mirazita, Marco, Miskimen, R, Mokeev, V, Morand, L, Morrow, Sa, Moteabbed, M, Mueller, J, Mutchler, Gs, Nadel Turonski, P, Napolitano, J, Nasseripour, R, Niccolai, S, Niculescu, G, Niculescu, I, Niczyporuk, Bb, Niroula, Mr, Nyazov, Ra, Nozar, M, O'Rielly, Gv, Osipenko, Mikhail, Ostrovidov, Ai, Park, K, Pasyuk, E, Paterson, C, Philips, Sa, Pierce, J, Pivnyuk, N, Pocanic, D, Pogorelko, O, Polli, Ermanno, Pozdniakov, S, Preedom, Bm, Price, Jw, Protopopescu, D, Qin, Lm, Raue, Ba, Riccardi, G, Ricco, Giovanni, Ripani, Marco, Ritchie, Bg, Ronchetti, Federico, Rosner, G, Rossi, Patrizia, Rowntree, D, Rubin, Pd, Sabatie, E, Salgado Lopez Carlos Alberto, Santoro, Joseph, Sapunenko, Vladimir, Schumacher, Ra, Serov, Vs, Sharabian, Yg, Shaw, J, Shvedunov, Nv, Skabelin, Av, Smith, Es, Smith, Lc, Sober, Di, Stavinsky, A, Stepanyan, Ss, Stepanyan, S, Stokes, Be, Stoler, P, Strakovsky, Ii, Strauch, S, Suleiman, R, Taiuti, MAURO GINO, Taylor, S, Tedeschi, Dj, Thoma, U, Thompson, R, Tkabladze, A, Tkachenko, S, Todor, L, Tur, C, Ungaro, M, Vineyard, Mf, Vlassov, Av, Weinstein, Lb, Weygand, Dp, Williams Meurig Crispin Stowe, Wolin, E, Wood, Mh, Yegneswaran, A, Yun, J, Zana, L, Zhang, J, Zhao, B, Zhao, Z., 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 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), 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: DEEP-INELASTIC-SCATTERING, Spin structure functions, QUARK, FOS: Physical sciences, 13.60.Hb, 13.88.+e, 14.20.Dh, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], PROTON, SUM-RULE, NEUTRON SPIN STRUCTURE, Nucleon structure, G(1)(N), CLAS, PION, DISTRIBUTIONS, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), NEUTRON SPIN STRUCTURE, DEEP-INELASTIC-SCATTERING, SUM-RULE, PROTON, DISTRIBUTIONS, G(1)(N), QUARK, CLAS, PION, Nuclear Experiment
Abstract: We report results for the virtual photon asymmetry $A_1$ on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ($^{15}$NH$_3$) and deuteron ($^{15}$ND$_3$) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for $A_1(x,Q^2)$ and the related ratio $g_1/F_1(x,Q^2)$ in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer $Q^2$ from 0.05 to 5.0 GeV$^2$ and in final-state invariant mass $W$ up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong $Q^2$--dependence of $A_1(x,Q^2)$ for $W$ below 2 GeV. At higher $W$, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but $A_1(x,Q^2)$ is not strictly $Q^2$--independent. We add significantly to the world data set at high $x$, up to $x = 0.6$. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative $d$-quark polarization up to our highest $x$. This data setshould improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions., Comment: 7 pages LaTeX, 5 figures
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42. Comment on the narrow structure reported by Amaryan et al

Author: Anghinolfi, M., Ball, J., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Bellis, M., Biselli, A. S., Bookwalter, C., Boiarinov, S., Bosted, P., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Cole, P. L., Crede, V., Vita, R., Sanctis, E., Dey, B., Dickson, R., Doughty, D., Dugger, M., Dupre, R., Egiyan, H., Alaoui, A. El, Fassi, L. El, Elouadrhiri, L., Eugenio, P., Fedotov, G., Gabrielyan, M. Y., Garcon, M., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Golovatch, E., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Heddle, D., Hicks, K., Holtrop, M., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Khetarpal, P., Kim, A., Kim, W., Kubarovsky, V., Kuleshov, S. V., Lu, H. Y., Macgregor, L. J. D., Markov, N., Mccracken, M. E., Mckinnon, B., Mestayer, M. D., Curtis Meyer, Mirazita, M., Mokeev, V., Moriya, K., Morrison, B., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Park, K., Park, S., Pereira, S. Anefalos, Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Ricco, G., Ripani, M., Ritchie, B. G., Rossi, P., Schott, D., Schumacher, R. A., Seder, E., Sharabian, Y. G., Smith, E. S., Sober, D. I., Stepanyan, S. S., Stoler, P., Tang, W., Ungaro, M., Vernarsky, B., Vineyard, M. F., Weygand, D. P., Wood, M. H., Zachariou, N., Zhao, B., 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: High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract: The CLAS Collaboration provides a comment on the physics interpretation of the results presented in a paper published by M. Amaryan et al. regarding the possible observation of a narrow structure in the mass spectrum of a photoproduction experiment., Comment: to be published in Physical Review C

43. 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

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