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1. Momentum sharing in imbalanced Fermi systems

Author

W. Kim, G. Niculescu, S. Chandavar, J. T. Goetz, A. Kim, P. Lenisa, C. E. Hyde, I. Niculescu, N. A. Baltzell, H. Hakobyan, Friedrich Klein, J. Ball, D. Doughty, C. Hanretty, D. Rimal, Shalev Gilad, F. Sabatié, A. El Alaoui, R. Dupre, M. Battaglieri, S. Fegan, Chaden Djalali, S. May-Tal Beck, P. Stoler, Nicholas Zachariou, Michael Dugger, M. Ripani, John Arrington, T. Cao, William Brooks, A. Deur, J. W. Price, M. Lowry, I. J. D. MacGregor, G. Rosner, H. Y. Lu, O. Pogorelko, Diane Schott, R. Shneor, I. Bedlinskiy, K. Park, S. Koirala, Y. Ilieva, Latifa Elouadrhiri, E. L. Isupov, M. Ungaro, D. G. Ireland, R. A. Schumacher, D. Protopopescu, N. Markov, H. Jiang, Volker D. Burkert, Y. Ghandilyan, A. S. Biselli, R. De Vita, L. L. Pappalardo, I. Zonta, G. V. Fedotov, X. Wei, S. Strauch, Douglas Higinbotham, L. Colaneri, M. Osipenko, A. Beck, K. Livingston, L. El Fassi, Lorenzo Zana, T. A. Forest, S. Stepanyan, Misak Sargsian, Hovanes Egiyan, C. Munoz Camacho, S. Pisano, K. P. Adhikari, M. Taiuti, M. Braverman, R. Paremuzyan, K. A. Griffioen, M. Mayer, Larry Weinstein, William Bertozzi, D. Keller, T. Mineeva, D. S. Carman, Andrea Celentano, Barry Ritchie, Gerard Gilfoyle, K. Joo, Eli Piasetzky, S. E. Kuhn, D. Sokhan, M. Hattawy, P. L. Cole, M. Khandaker, P. Rossi, R. W. Gothe, F. X. Girod, B. Garillon, V. Crede, B. McKinnon, S. A. Wood, Z. W. Zhao, N. Gevorgyan, P. Nadel-Turonski, M. Garçon, W. I. Levine, Victor Mokeev, E. Voutier, Y. G. Sharabian, X. Zheng, Andrew Puckett, H. S. Jo, A. V. Vlassov, S. Tkachenko, L. Guo, G. Asryan, K. Hicks, Y. Prok, W. Phelps, A. Rizzo, S. Niccolai, A. Movsisyan, S. S. Stepanyan, E. Pasyuk, V. Sytnik, Or Hen, I. Korover, P. Roy, M. Guidal, B. Mustapha, B. I. Ishkanov, G. D. Smith, M. Holtrop, S. Procureur, V. P. Kubarovsky, Annalisa D'Angelo, Michael Wood, K. Hafidi, H. Avakian, N. K. Walford, 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), 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, 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), 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, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Nuclear Theory (nucl-th), symbols.namesake, Pauli exclusion principle, Semi-empirical mass formula, Nuclear force, Nuclear drip line, Nuclear Experiment (nucl-ex), Nuclear Experiment, Condensed Matter::Quantum Gases, Physics, Multidisciplinary, Fermi energy, Quantum Gases (cond-mat.quant-gas), Atomic nucleus, Nuclear magnetic moment, symbols, Condensed Matter - Quantum Gases, Fermi gas
Abstract

The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the majority fermions (usually neutrons) to have a higher average momentum. Our high-energy electron scattering measurements using 12C, 27Al, 56Fe and 208Pb targets show that, even in heavy neutron-rich nuclei, short-range interactions between the fermions form correlated high-momentum neutron-proton pairs. Thus, in neutron-rich nuclei, protons have a greater probability than neutrons to have momentum greater than the Fermi momentum. This finding has implications ranging from nuclear few body systems to neutron stars and may also be observable experimentally in two-spin state, ultra-cold atomic gas systems., Comment: Published in Science. 10 pages, 3 figures

Published
2014

2. $\phi$-meson photoproduction on Hydrogen in the neutral decay mode

Author

D. Doughty, Michael Wood, D. Heddle, K. Livingston, K. Hafidi, Jie Zhang, W. Kim, Victor Mokeev, N. Guler, Y. Ilieva, R. De Vita, W. J. Briscoe, P. Rossi, H. Y. Lu, M. J. Amaryan, S. Lewis, D. S. Carman, E. Munevar, N. A. Baltzell, H. Moutarde, P. Eugenio, E. Seder, N. Dashyan, M. Ungaro, K. L. Giovanetti, C. E. Hyde, K. A. Griffioen, Larry Weinstein, J. Bono, P. Nadel-Turonski, D. Protopopescu, W. Gohn, S. Pozdniakov, I. Niculescu, B. S. Ishkhanov, D. Keller, A. Kim, F. X. Girod, Z. W. Zhao, D. Ho, L. Weinstein, V. P. Kubarovsky, K. Joo, Barry Ritchie, P. Stoler, I. I. Strakovsky, Annalisa D'Angelo, H. Hakobyan, C. Hanretty, Andrea Celentano, R. Paremuzyan, M. Khandaker, A. Deur, K. Hicks, Nicholas Zachariou, H. Avakian, M. Ripani, W. Tang, S. E. Kuhn, W. K. Brooks, D. P. Watts, J. A. Fleming, J. J. Phillips, D. Rimal, M. Osipenko, C. E. Taylor, H. Baghdasaryan, S. Tkachenko, L. Guo, N. K. Walford, G. V. Fedotov, H. Voskanyan, G. Rosner, R. Nasseripour, I. J. D. MacGregor, E. Pasyuk, K. P. Adhikari, E. Golovatch, E. Voutier, Andrew Puckett, Martin K. Mayer, S. Strauch, D. Martinez, R. P. Bennett, E. De Sanctis, N. Harrison, R. G. Fersch, S. Fegan, M. Aghasyan, D. Adikaram, M. Guidal, Friedrich Klein, M. S. Saini, I. Bedlinskiy, R. A. Schumacher, D. I. Sober, G. D. Smith, M. Holtrop, D. Sokhan, J. P. Ball, S. Chandavar, Luciano Pappalardo, A. Rizzo, S. Park, R. W. Gothe, R. Dupre, M. Battaglieri, S. Niccolai, T. Mineeva, O. Pogorelko, P. Collins, M. F. Vineyard, Diane Schott, L. El Fassi, S. Bültmann, Sergey Kuleshov, A. I. Ostrovidov, K. Park, H. Seraydaryan, S. Anefalos Pereira, Y. G. Sharabian, A. Kubarovsky, S. Stepanyan, D. G. Ireland, V. Crede, Volker D. Burkert, M. Contalbrigo, A. S. Biselli, R. A. Montgomery, J. T. Goetz, H. S. Jo, S. Pisano, C. Munoz Camacho, Lorenzo Zana, B. McKinnon, M. Mirazita, C. Salgado, E. Phelps, N. Gevorgyan, V. Batourine, O. Cortes, E. L. Isupov, Ye Tian, S. Boiarinov, F. Sabatié, J. W. Price, G. Gavalian, S. Koirala, Chaden Djalali, Michael Dugger, Old Dominion University [Norfolk] (ODU), 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), 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 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 and High Energy Physics, Particle physics, Meson, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, Pion, LARGE MOMENTUM-TRANSFER, DRIFT CHAMBER SYSTEM, CLAS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PERTURBATIVE QCD, SPECTROMETER, Invariant mass, NEAR-THRESHOLD, Nuclear Experiment, DETECTOR, Physics, Spectrometer, Perturbative QCD, Phi meson, Baryon, BARYON RESONANCES, High Energy Physics::Experiment, Energy (signal processing)
Abstract

See paper for full list of authors; We report the first measurement of the photoproduction cross section of the $\phi$ meson in its neutral decay mode in the reaction $\gamma p \to p\phi(K_SK_L)$. The experiment was performed with a tagged photon beam of energy $1.6 \le E_\gamma \le 3.6$ GeV incident on a liquid hydrogen target of the CLAS spectrometer at the Thomas Jefferson National Accelerator Facility. The $p \phi$ final state is identified via reconstruction of $K_S$ in the invariant mass of two oppositely charged pions and by requiring the missing particle in the reaction $\gamma p \to p K_S X$ to be $K_L$. The presented results significantly enlarge the existing data on $\phi$-photoproduction. These data, combined with the data from the charged decay mode, will help to constrain different mechanisms of $\phi$ photoproduction.

Published
2014

3. Hard Two-body Photodisintegration of 3He

Author

G. Niculescu, N. Dashyan, D. Protopopescu, E. Cisbani, S. Pozdniakov, G. Rosner, S. Tkachenko, C. Djalali, Yujie Qiang, C. S. Nepali, X. Yan, Idaykis Rodriguez, F. X. Girod, Yordanka Ilieva, L. Guo, Andrew Puckett, G. Charles, Yingxiao Wang, H. Baghdasaryan, Victor Mokeev, S. Beck, Martin K. Mayer, M. S. Saini, Nikolaos Sparveris, X. Zhan, E. Voutier, J. A. Fleming, Ronald Gilman, E. L. Isupov, J. T. Goetz, E. De Sanctis, Dustin Keller, E. Piasetzky, Diane Schott, R. Shneor, G. Ricco, C. W. de Jager, W. Tang, Franco Garibaldi, M. Aghasyan, A. I. Ostrovidov, K. Park, G. G. Petratos, Bryan J. Moffit, Michael Wood, K. Hafidi, T. Mineeva, N. Harrison, A. Deur, Barry Ritchie, P. L. Cole, M. Osipenko, M. Contalbrigo, N. A. Saylor, J. Bono, P. Nadel-Turonski, S. Boiarinov, D. G. Ireland, M. Anghinolfi, H. Seraydaryan, X. Zheng, D. Doughty, I. Zonta, B. S. Ishkhanov, H. Yao, W. K. Brooks, C. E. Taylor, R. A. Schumacher, R. Dupre, N. Bubis, X. Jiang, A. El Alaoui, D. Martinez, M. Battaglieri, V. Crede, B. Lee, K. Joo, Volker D. Burkert, A. S. Biselli, George Davey Smith, D. Heddle, S. Koirala, Guy Ron, V. P. Kubarovsky, K. A. Griffioen, R. De Vita, A. Kim, E. Golovatch, A. Beck, N. A. Baltzell, O. Pogorelko, M. Ungaro, N. D. Kvaltine, Xin Qian, W. J. Briscoe, J. P. Ball, R. A. Montgomery, S. Chandavar, Y. Mao, Friedrich Klein, K. Chirapatpimol, P. Khetarpal, D. S. Carman, P. Stoler, O. Geagla, Nicholas Zachariou, A. Camsonne, S. Anefalos Pereira, Michael Vineyard, A. J. Sarty, N. K. Walford, P. Eugenio, D. G. Meekins, A. D'Angelo, H. Voskanyan, A. T. Katramatou, R. Michaels, Douglas Higinbotham, M. Taiuti, K. Hicks, C. Dutta, Vincent Sulkosky, S. Stepanyan, E. Schulte, E. Munevar, Bogdan Wojtsekhowski, D. Rimal, E. Seder, A. Fradi, B. Vernarsky, S. Lewis, M. J. Amaryan, B. Guegan, C. E. Hyde, F. Sabatié, L. El Fassi, W. U. Boeglin, G. E. Dodge, S. Procureur, R. Nasseripour, C. Munoz Camacho, H. Y. Lu, S. Fegan, R. A. Lindgren, S. Strauch, H. S. Jo, Ishay Pomerantz, J. J. LeRose, C. A. Meyer, S. Pisano, G. V. Fedotov, H. Moutarde, D. P. Watts, H. Egiyan, C. Bookwalter, F. Cusanno, K. Livingston, K. L. Giovanetti, I. Niculescu, I. J. D. MacGregor, K. P. Adhikari, D. P. Weygand, Larry Weinstein, W. Gohn, R. Paremuzyan, Jie Zhang, A. Celentano, R. W. Gothe, Z. W. Zhao, D. Ho, Emily M. McCullough, R. Subedi, D. Sokhan, M. Khandaker, B. McKinnon, B. L. Berman, J. Glister, M. Mirazita, E. Phelps, N. Gevorgyan, V. Batourine, S. Park, S. Niccolai, P. Rossi, H. Hakobyan, M. Guidal, M. Holtrop, A. Daniel, Luciano Pappalardo, S. S. Stepanyan, Mustafa Canan, Kalyan Allada, I. Bedlinskiy, A. Kubarovsky, Sergey Kuleshov, E. Khrosinkova, B. Sawatzky, M. Ripani, A. Saha, W. Kim, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique 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
Particle physics, Photon, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Few-body systems, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Cross section (physics), ANGLE ELASTIC-SCATTERING, CROSS-SECTION, DEUTERON, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Scaling, Physics, 010308 nuclear & particles physics, medicine.anatomical_structure, Deuterium, Photodisintegration, Nucleus
Abstract

We have measured cross sections for the {gamma}+{sup 3}He->p+d reaction at photon energies of 0.4 - 1.4 GeV and a center-of-mass angle of 90 deg. We observe dimensional scaling above 0.7 GeV at this center-of-mass angle. This is the first observation of dimensional scaling in the photodisintegration of a nucleus heavier than the deuteron.

Published
2013

4. Measurement of transparency ratios for protons from short-range correlated pairs

Author

V. Crede, John Arrington, S. Strauch, D. P. Watts, B. McKinnon, I. Zonta, M. Contalbrigo, C. E. Taylor, Barry Ritchie, R. A. Montgomery, A. El Alaoui, P. Eugenio, A. Kim, Y. Ilieva, E. Phelps, R. Nasseripour, S. Tkachenko, G. V. Fedotov, M. Taiuti, K. P. Adhikari, Nicholas Zachariou, S. E. Kuhn, J. A. Fleming, M. J. Amaryan, E. Golovatch, L. Guo, V. Batourine, Eli Piasetzky, Dustin Keller, S. Procureur, D. Rimal, J. T. Goetz, S. Niccolai, M. Y. Gabrielyan, S. Fegan, Michael Wood, N. Harrison, H. Moutarde, K. Hafidi, Victor Mokeev, K. L. Giovanetti, A. Celentano, R. W. Gothe, H. Seraydaryan, I. Korover, Larry Weinstein, R. Dupre, M. Battaglieri, M. Ripani, Y. G. Sharabian, X. Zheng, N. Gevorgyan, S. Chandavar, J. P. Ball, E. L. Isupov, Andrew Puckett, George Davey Smith, Ye Tian, Martin K. Mayer, D. S. Carman, Gerard Gilfoyle, D. Protopopescu, D. Sokhan, S. Pozdniakov, S. Park, B. Mustapha, M. Holtrop, Diane Schott, Chaden Djalali, N. K. Walford, M. Khandaker, S. Boiarinov, R. Shneor, H. Hakobyan, A. I. Ostrovidov, E. De Sanctis, K. Park, M. S. Saini, E. Pasyuk, Lorenzo Zana, P. Rossi, K. Livingston, D. Doughty, Luciano Pappalardo, F. Sabatié, R. A. Schumacher, D. G. Ireland, H. S. Jo, W. J. Briscoe, D. Heddle, Jie Zhang, E. Voutier, N. Dashyan, L. El Fassi, M. Ungaro, I. Bedlinskiy, W. Gohn, Volker D. Burkert, A. S. Biselli, M. Aghasyan, K. Hicks, K. A. Griffioen, Hovanes Egiyan, D. I. Sober, C. Munoz Camacho, S. Stepanyan, S. S. Stepanyan, E. Munevar, R. Paremuzyan, P. L. Cole, Or Hen, G. E. Dodge, H. Y. Lu, G. Rosner, K. Joo, H. Baghdasaryan, V. P. Kubarovsky, J. Bono, P. Nadel-Turonski, A. Deur, J. J. Phillips, O. Pogorelko, I. Niculescu, S. Pisano, N. Pivnyuk, W. K. Brooks, A. Kubarovsky, H. Voskanyan, I. J. D. MacGregor, A. V. Vlassov, R. De Vita, Shalev Gilad, S. Anefalos Pereira, Friedrich Klein, Brian Raue, F. X. Girod, C. E. Hyde, A. DʼAngelo, J. W. Price, S. Koirala, P. Khetarpal, B. Vernarsky, B. S. Ishkhanov, T. Mineeva, W. Tang, M. Osipenko, A. Beck, D. Martinez, G. Niculescu, S. May-Tal Beck, 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 reaction, Nuclear and High Energy Physics, Proton, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, PROPAGATION, HIGH Q(2), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Nuclear Theory (nucl-th), 0103 physical sciences, SCATTERING, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, NUCLEAR TRANSPARENCY, Physics, Momentum (technical analysis), 010308 nuclear & particles physics, Momentum transfer, Carbon-12, Baryon, Nuclear transparency, Atomic physics, Nucleon
Abstract

Nuclear transparency, Tp(A), is a measure of the average probability for a struck proton to escape the nucleus without significant re-interaction. Previously, nuclear transparencies were extructed for quasi-elastic A(e,e'p) knockout of protons with momentum below the Fermi momentum, where the spectral functions are well known. In this paper we extract a novel observable, the transparency ratio, Tp(A)/T_p(12C), for knockout of high-missing-momentum protons from the breakup of short range correlated pairs (2N-SRC) in Al, Fe and Pb nuclei relative to C. The ratios were measured at momentum transfer Q^2 > 1.5 (GeV/c)^2 and x_B > 1.2 where the reaction is expected to be dominated by electron scattering from 2N-SRC. The transparency ratios of the knocked-out protons coming from 2N-SRC breakup are 20 - 30% lower than those of previous results for low missing momentum. They agree with Glauber calculations and agree with renormalization of the previously published transparencies as proposed by recent theoretical investigations. The new transparencies scale as A^-1/3, which is consistent with dominance of scattering from nucleons at the nuclear surface., 6 pages, 4 figures

Published
2013

5. Branching ratio of the electromagnetic decay of the Σ+(1385)

Author

S. S. Stepanyan, V. Mokeev, R. Nasseripour, A. El Alaoui, Y. Ilieva, A. V. Vlassov, M. Paolone, N. Dashyan, Nicholas Zachariou, A. Kubarovsky, R. Dupre, M. Battaglieri, R. De Vita, V. Crede, D. Keller, P. Eugenio, Latifa Elouadrhiri, S. Tkachenko, L. Guo, D. Rimal, G. Ricco, C. A. Meyer, M. Taiuti, S. Strauch, M. Ripani, G. V. Fedotov, P. L. Cole, P. Nadel-Turonski, D. Adikaram, M. Guidal, B. McKinnon, S. Anefalos Pereira, H. Baghdasaryan, D. P. Watts, R. A. Schumacher, M. Khandaker, Michael Wood, K. P. Adhikari, C. E. Taylor, K. Hafidi, Elton Smith, K. Joo, E. Golovatch, G. D. Smith, M. Holtrop, S. Niccolai, N. Markov, A. D'Angelo, Friedrich Klein, E. De Sanctis, C. Djalali, Brian Raue, T. Mineeva, D. Protopopescu, Barry Ritchie, A. Daniel, Luciano Pappalardo, S. Pisano, S. Pozdniakov, W. Tang, D. I. Sober, L. Graham, F. Sabatié, P. Khetarpal, C. Bookwalter, M. J. Amaryan, M. Anghinolfi, M. Osipenko, A. Celentano, R. W. Gothe, Z. W. Zhao, S. Procureur, D. Branford, L. El Fassi, Michael Vineyard, H. Seraydaryan, H. Hakobyan, V. P. Kubarovsky, M. Y. Gabrielyan, O. Pogorelko, H. Moutarde, Lorenzo Zana, A. I. Ostrovidov, K. Park, M. Mirazita, E. Voutier, Y. G. Sharabian, S. Stepanyan, K. L. Giovanetti, J. P. Ball, B. Vernarsky, N. Gevorgyan, W. Gohn, S. Park, Y. Prok, D. S. Carman, M. Contalbrigo, P. Stoler, H. S. Jo, N. Guler, D. G. Ireland, D. Doughty, Sergey Kuleshov, E. Munevar, Martin K. Mayer, G. Rosner, P. Rossi, H. Voskanyan, I. Bedlinskiy, B. S. Ishkhanov, K. Hicks, H. Y. Lu, K. A. Griffioen, Volker D. Burkert, A. S. Biselli, C. Salgado, W. J. Briscoe, M. S. Saini, E. Pasyuk, S. Chandavar, Y. Mao, W. Kim, I. Niculescu, E. L. Isupov, B. Zhao, G. Niculescu, D. Schott, S. Boiarinov, R. Paremuzyan, William Brooks, Gerard Gilfoyle, I. J. D. MacGregor, D. Sokhan, A. Kim, 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), 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
Nuclear and High Energy Physics, Particle physics, STRANGENESS, TRANSITIONS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, QUARK-MODEL, RADIATIVE DECAYS, HYPERFINE INTERACTIONS, BARYONS, HYPERONS, 0103 physical sciences, Fitting algorithm, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Photon beam, Nuclear Experiment, 010306 general physics, Physics, Partial width, 010308 nuclear & particles physics, Branching fraction, Hyperon, Symmetry test, Photon beams, High Energy Physics::Experiment, Energy (signal processing)
Abstract

The CLAS detector was used to obtain the first ever measurement of the electromagnetic decay of the ${\ensuremath{\Sigma}}^{*+}(1385)$ from the reaction $\ensuremath{\gamma}p\ensuremath{\rightarrow}{K}^{0}{\ensuremath{\Sigma}}^{*+}(1385)$. A real photon beam with a maximum energy of 3.8 GeV was incident on a liquid-hydrogen target, resulting in the photoproduction of the kaon and ${\ensuremath{\Sigma}}^{*}$ hyperon. Kinematic fitting was used to separate the reaction channel from the background processes. The fitting algorithm exploited a new method to kinematically fit neutrons in the CLAS detector, leading to the measured decay widths ratio ${\ensuremath{\Sigma}}^{+}(1385)\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}\ensuremath{\gamma}/{\ensuremath{\Sigma}}^{+}(1385)\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}{\ensuremath{\pi}}^{0}=11.95\ifmmode\pm\else\textpm\fi{}2.21(\mathrm{stat}{)}_{\ensuremath{-}1.21}^{+0.53}(\mathrm{sys})%$ and a deduced partial width of $250.0\ifmmode\pm\else\textpm\fi{}56.9(\mathrm{stat}{)}_{\ensuremath{-}41.2}^{+34.3}(\mathrm{sys})\text{ }\text{ }\mathrm{keV}$. A U-spin symmetry test using the SU(3) flavor-multiplet representation yields predictions for the ${\ensuremath{\Sigma}}^{*+}(1385)\ensuremath{\rightarrow}{\ensuremath{\Sigma}}^{+}\ensuremath{\gamma}$ and ${\ensuremath{\Sigma}}^{*0}(1385)\ensuremath{\rightarrow}\ensuremath{\Lambda}\ensuremath{\gamma}$ partial widths that agree with the experimental measurements.

Published
2012

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