Search

Your search keyword '"E. Golovatch"' showing total 16 results
Start Over Author "E. Golovatch" Publisher hal ccsd
16 results on '"E. Golovatch"'

1. Beam–target helicity asymmetry $E$ in $K^+$ $\Sigma^-$ photoproduction on the neutron

Author

R. De Vita, D. Marchand, H. Atac, H. S. Jo, A. Filippi, L. Marsicano, N. K. Walford, O. Soto, M. Khandaker, I. J. D. MacGregor, K. Hicks, W. Phelps, R. A. Schumacher, Michael Paolone, H. Hakobyan, W. Kim, G. Charles, F. Bossu, H. Lu, S. Joosten, J. W. Price, S. Diehl, C. Salgado, William Brooks, L. Venturelli, D. Heddle, V. P. Kubarovsky, I. Bedlinskiy, Z. E. Meziani, V. Mascagna, A. Celentano, R. W. Gothe, N. Markov, Alessandro Rizzo, W. Gohn, G. Asryan, Axel Schmidt, Dustin Keller, M. Ungaro, M. Guidal, M. Contalbrigo, M. Osipenko, Z. W. Zhao, Fatiha Benmokhtar, E. L. Isupov, Y. Prok, J. Poudel, O. Pogorelko, A. I. Ostrovidov, K. Park, M. J. Amaryan, Michael Wood, K. Hafidi, M. Holtrop, M. Ehrhart, C.D. Bass, V. A. Nikonov, A. D'Angelo, D. G. Jenkins, D. G. Ireland, G. Rosner, S. Boiarinov, E. Golovatch, P. Eugenio, K. Livingston, Luciano Pappalardo, K. Joo, M. Leali, Jie Zhang, T. Kageya, Volker D. Burkert, Y. Ghandilyan, A. S. Biselli, C. W. Kim, G. Gavalian, U. Shrestha, F.-X. Girod, Gerard Gilfoyle, M. Ripani, R. G. Fersch, H. Voskanyan, A. El Alaoui, G. Angelini, Nicholas Zachariou, J. C. Carvajal, W. J. Briscoe, P. L. Cole, T. Chetry, N. Gevorgyan, D. Ho, I. I. Strakovsky, A. M. Sandorfi, A. Deur, Victor Mokeev, D. Sokhan, T. R. O'Connell, Chaden Djalali, P. Nadel Turonski, T. Mineeva, M. Bashkanov, S. Adhikari, D. Bulumulla, E. Munevar, B. McKinnon, B. S. Ishkhanov, Aditya R. Khanal, Andrea Bianconi, I. Zonta, X. Wei, P. Peng, Hovanes Egiyan, C. Munoz Camacho, P. Lenisa, M. Hattawy, J. A. Fleming, Friedrich Klein, Brian Raue, Andrew Puckett, E. Voutier, Martin K. Mayer, M. Khachatryan, K. A. Griffioen, Nikolaos Sparveris, K. P. Adhikari, C. S. Whisnant, C. Hanretty, L. Lanza, R. Dupre, M. Battaglieri, M. Lowry, S. Strauch, Eugene Pasyuk, N. Dashyan, Yordanka Ilieva, L. Barion, G. Ciullo, D. S. Carman, S. Fegan, D. P. Watts, A. V. Sarantsev, N. Tyler, J. A. Tan, P. Chatagnon, 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 des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and CLAS

Subjects
Nuclear and High Energy Physics, Socio-culturale, nucleon resonance, Nucleons, Photoproduction, Mesons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, K+: photoproduction, Particle identification, Nuclear physics, chemistry.chemical_compound, PE2_2, PE2_1, CLAS, 0103 physical sciences, Neutron, Hydrogen deuteride, n: target, 010306 general physics, Nuclear Experiment, PE2_3, photon: beam, Physics, 010308 nuclear & particles physics, nucleus: target, Settore FIS/04, Resonance, helicity: asymmetry, Observable, Sigma-: photoproduction, Helicity, lcsh:QC1-999, chemistry, Excited state, spectrometer, Nucleon, lcsh:Physics, Jefferson Lab, experimental results
Abstract

We report a measurement of a beam–target double-polarisation observable (E) for the γ→n→(p)→K+Σ−(p) reaction. The data were obtained impinging the circularly-polarised energy-tagged photon beam of Hall B at Jefferson Lab on a longitudinally-polarised frozen-spin hydrogen deuteride (HD) nuclear target. The E observable for an effective neutron target was determined for centre-of-mass energies 1.70≤W≤2.30 GeV, with reaction products detected over a wide angular acceptance by the CLAS spectrometer. These new double-polarisation data give unique constraints on the strange decays of excited neutron states. Inclusion of the new data within the Bonn-Gatchina theoretical model results in significant changes for the extracted photocouplings of a number of established nucleon resonances. Possible improvements in the PWA description of the experimental data with additional “missing” resonance states, including the N(2120)3/2− resonance, are also quantified.

Published
2020

2. Measurement of Nuclear Transparency Ratios for Protons and Neutrons

Author

M. Patsyuk, R. Paremuzyan, Nicholas M. Harrison, Gerard Gilfoyle, P. Eugenio, M. Taiuti, P. Lenisa, O. Soto, D. Sokhan, N. Dashyan, M. Battaglieri, Y. G. Sharabian, T. B. Hayward, X. Zheng, F. X. Girod, S. Kuleshov, J. W. Price, J. A. Tan, Friedrich Klein, V. Crede, Taya Chetry, Brian Raue, D. Marchand, Or Hen, Michael Paolone, S. Strauch, D. Heddle, Iu. Skorodumina, A. Beck, L. Barion, M. Khachatryan, Hovanes Egiyan, C. Munoz Camacho, A. I. Ostrovidov, R. De Vita, H. S. Jo, Nikolaos Sparveris, R. A. Montgomery, D. Payette, D. G. Ireland, K. Livingston, K. A. Griffioen, Volker D. Burkert, R. Cruz Torres, A. S. Biselli, I. Bedlinskiy, P. Nadel-Turonski, S. Adhikari, Eli Piasetzky, B. McKinnon, H. Hakobyan, W. K. Brooks, Dinko Pocanic, P. Chatagnon, F. Sabatié, F. Cao, I. Korover, M. Duer, R. A. Schumacher, S. Diehl, C. Salgado, M. Guidal, S. E. Kuhn, M. Hattawy, M. Mirazita, B. Duran, B. Mustapha, X. Wei, Sylvester Joosten, L. Lanza, G. Laskaris, Jie Zhang, T. A. Forest, E. De Sanctis, S. Mey-Tal Beck, M. Holtrop, A. Filippi, M. Ripani, S. Stepanyan, Avraham Klein, Luciano Pappalardo, M. Khandaker, Axel Schmidt, E. L. Isupov, Chaden Djalali, T. Mineeva, S. Boiarinov, G. Ciullo, Y. Prok, A. Deur, D. S. Carman, Sandra K. Johnston, E.P. Segarra, O. Cortes, Larry Weinstein, Eliahu Cohen, S. Niccolai, E. Golovatch, A. El Alaoui, Y. Ilieva, R. Dupre, Victor Mokeev, A. Movsisyan, Nicholas Zachariou, D. Protopopescu, Z. W. Zhao, E. Voutier, B. Schmookler, G. Angelini, B. S. Ishkhanov, M. Ungaro, P. Rossi, Aditya R. Khanal, K. Joo, A. Kim, M. Ehrhart, Dustin Keller, K. Hafidi, H. Avakian, H. Voskanyan, W. J. Briscoe, E. Pasyuk, V. P. Kubarovsky, D. Riser, O. Pogorelko, G. Khachatryan, G. Rosner, P. L. Cole, L. Guo, Alessandro Rizzo, C. Hanretty, A. D'Angelo, M. Osipenko, W. Kim, G. Niculescu, L. El Fassi, C. Ayerbe Gayoso, Rong Wang, A. Celentano, R. W. Gothe, F. Hauenstein, I. J. D. MacGregor, M. Contalbrigo, 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), 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 Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear and High Energy Physics, Nuclear Theory, Proton, nucleon: pair, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], FOS: Physical sciences, Socio-culturale, short-range, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear Theory (nucl-th), Nuclear physics, approximation: Glauber, CLAS, fragmentation, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, Physics, n: momentum, 010308 nuclear & particles physics, Settore FIS/04, Neutron, Nuclear Transparency, Hadron physics, Proton, Breakup, lcsh:QC1-999, Nuclear transparency, kinematics, Nuclear Transparency, Nucleon, Hadron physics, Glauber, nucleus: transparency, lcsh:Physics, experimental results
Abstract

This paper presents, for the first time, measurements of neutron transparency ratios for nuclei relative to C measured using the (e,e'n) reaction, spanning measured neutron momenta of 1.4 to 2.4 GeV/c. The transparency ratios were extracted in two kinematical regions, corresponding to knockout of mean-field nucleons and to the breakup of Short-Range Correlated nucleon pairs. The extracted neutron transparency ratios are consistent with each other for the two measured kinematical regions and agree with the proton transparencies extracted from new and previous (e,e'p) measurements, including those from neutron-rich nuclei such as lead. The data also agree with and confirm the Glauber approximation that is commonly used to interpret experimental data. The nuclear-mass-dependence of the extracted transparencies scales as A^{\alpha} with {\alpha} = -0.289 {\pm} 0.007, which is consistent with nuclear-surface dominance of the reactions., Comment: Accepted for publication in Physics Letters B

Published
2019

3. Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

Author

A. El Alaoui, Alessandro Rizzo, C. Ayerbe Gayoso, M. Khandaker, R. Paremuzyan, Nicholas Zachariou, O. Soto, Andrea Celentano, Nicholas M. Harrison, Gerard Gilfoyle, D. P. Watts, S. Fegan, D. Sokhan, V. Crede, K. Livingston, M. Garçon, Sandra K. Johnston, R. A. Montgomery, Jie Zhang, F. X. Girod, M. Battaglieri, M. Contalbrigo, G. Gavalian, E. Golovatch, S. Strauch, Aditya R. Khanal, S. Niccolai, A. Filippi, M. Ripani, R. Dupre, N A Baltzell, K. L. Giovanetti, A. D'Angelo, E. L. Isupov, G. Khachatryan, Dustin Keller, Larry Weinstein, P. Lenisa, Yordanka Ilieva, M. Defurne, N. Markov, Chaden Djalali, Michael Wood, Laura Clark, E. De Sanctis, F. Sabatié, D. Heddle, K. A. Griffioen, T. Mineeva, L. Barion, K. Hafidi, J. Poudel, Taya Chetry, C. Munoz Camacho, P. L. Cole, Iu. Skorodumina, G. Angelini, P. Rossi, T. B. Hayward, D. Protopopescu, Z. W. Zhao, B. McKinnon, F. Hauenstein, Friedrich Klein, L. Lanza, B. Torayev, A Fradi, S. Diehl, C. Salgado, V. P. Kubarovsky, D. Riser, G. Ciullo, O. Pogorelko, M. Mirazita, H. Egiyan, F. Bossu, G. Rosner, P. Eugenio, Y. Prok, D. S. Carman, L. El Fassi, E. Pasyuk, M. Taiuti, C. W. Kim, Zein-Eddine Meziani, F. Cao, M. L. Kabir, S. E. Kuhn, M. Hattawy, H. Voskanyan, A. I. Ostrovidov, D. G. Jenkins, I. J. D. MacGregor, M. Guidal, Rong Wang, N. Dashyan, D. G. Ireland, M Ehrhart, A. S. Biselli, N. Gevorgyan, R. W. Gothe, M. Holtrop, I. Bedlinskiy, Luciano Pappalardo, Martin K. Mayer, A. Deur, W. Kim, M. Khachatryan, Nikolaos Sparveris, W. K. Brooks, S. Adhikari, Y. G. Sharabian, R. De Vita, D. Marchand, H. S. Jo, X. Wei, R. A. Schumacher, S. Bültmann, T. A. Forest, S. Stepanyan, Simonetta Liuti, M. Ungaro, Y. Perrin, K. Hicks, P. Chatagnon, P. Nadel-Turonski, N. Tyler, J. A. Tan, E. Voutier, 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)-Université Grenoble Alpes (UGA), 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, Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
generalized parton distribution, Proton, EMC effect, Nuclear Theory, General Physics and Astronomy, Virtual particle, parton: distribution function, Parton, Electron, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Electromagnetic probes, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), Form factors, Electromagnetic probes, Nuclear Structure, Deep Virtual Compton Scattering, Quark models, Electron-ion collisions, Nuclear structure & decays, Nucleon distribution, electron: beam, Nuclear Experiment, Physics, Settore FIS/04, Form factors, nucleon, matter: effect, kinematics, Quark models, Nucleon, spin: asymmetry, accelerator, FOS: Physical sciences, Socio-culturale, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, Deep Virtual Compton Scattering, Nuclear physics, PE2_2, PE2_1, deeply virtual Compton scattering, CLAS, 0103 physical sciences, structure, 010306 general physics, PE2_3, Electron-ion collisions, Nuclear Physics, Scattering, Nuclear structure &amp, Compton scattering, Automatic Keywords, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon distribution, spectrometer, decays, experimental results, photon: virtual
Abstract

In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investigate correlations between the transverse position and the longitudinal momentum of quarks inside the nucleon. Meanwhile, the structure of bound nucleons in nuclei has been studied in inclusive deep-inelastic lepton scattering experiments off nuclear targets, showing a significant difference in longitudinal momentum distribution of quarks inside the bound nucleon, known as the EMC effect. In this work, we report the first beam spin asymmetry (BSA) measurement of exclusive deeply virtual Compton scattering (DVCS) off a proton bound in $^4$He. The data used here were accumulated using a $6$ GeV longitudinally polarized electron beam incident on a pressurized $^4$He gaseous target placed within the CLAS spectrometer in Hall-B at the Thomas Jefferson National Accelerator Facility. The azimuthal angle ($\phi$) dependence of the BSA was studied in a wide range of virtual photon and scattered proton kinematics. The $Q^2$, $x_B$, and t dependencies of the BSA on the bound proton are compared with those on the free proton. In the whole kinematical region of our measurements, the BSA on the bound proton is smaller by 20\% to 40\%, indicating possible medium modification of its partonic structure.

Published
2019

4. Direct Observation of Proton-Neutron Short-Range Correlation Dominance in Heavy Nuclei

Author

W. Phelps, T. B. Hayward, Or Hen, Rong Wang, Friedrich Klein, P. Eugenio, M. Taiuti, M. L. Kabir, Andrea Celentano, X. Wei, J.R. Pybus, L. Guo, A. Beck, S. Niccolai, Laura Clark, A. I. Ostrovidov, G. Rosner, M. Contalbrigo, A. Denniston, D. G. Ireland, C. Hanretty, A. Hrnjic, G. Niculescu, K. A. Griffioen, G. Ciullo, G. Angelini, P. Rossi, D. S. Carman, Volker D. Burkert, A. S. Biselli, R. Cruz Torres, K. Livingston, A. Rizzo, M. Duer, Michael Paolone, N. Markov, H. S. Jo, Iu. Skorodumina, A. Movsisyan, S. Diehl, Y. Prok, E. L. Isupov, B. McKinnon, N. Tyler, M. Osipenko, R. W. Gothe, M. Khandaker, Michael Wood, J. A. Tan, V. Crede, Y. Ilieva, K. Joo, E. De Sanctis, F. Cao, B. Duran, I. Korover, R. A. Montgomery, K. Hicks, D. Heddle, I. Bedlinskiy, S. Stepanyan, H. Voskanyan, F. Hauenstein, R. A. Schumacher, M. Battaglieri, Chaden Djalali, F. X. Girod, B. Mustapha, E. Pasyuk, N. Dashyan, H. Hakobyan, A. D'Angelo, F. Sabatié, M. Holtrop, M. Mirazita, I. J. D. MacGregor, Eliahu Cohen, K. Park, A. El Alaoui, P. Nadel-Turonski, H. Egiyan, T. A. Forest, W. Kim, B. S. Ishkhanov, David M. Keller, E.P. Segarra, L. El Fassi, Aditya R. Khanal, Nicholas Zachariou, S. E. Kuhn, Eli Piasetzky, M. Ripani, S. Strauch, V. P. Kubarovsky, Taya Chetry, M. Hattawy, Nir Barnea, Axel Schmidt, J. Zhang, D. Protopopescu, P. L. Cole, Z. W. Zhao, E. Voutier, Y. G. Sharabian, A. Deur, W. K. Brooks, S. Adhikari, E. Golovatch, R. Dupre, Ronen Weiss, K. Hafidi, L. Lanza, M. Khachatryan, C. Munoz Camacho, Nikolaos Sparveris, M. Patsyuk, R. Paremuzyan, Nicholas M. Harrison, Gerard Gilfoyle, D. Sokhan, A. Filippi, K. L. Giovanetti, Larry Weinstein, X. Zheng, R. De Vita, S. Mey-Tal Beck, B. Schmookler, D. Marchand, M. Ungaro, G. Laskaris, S. Boiarinov, O. Pogorelko, O. Cortes, Victor Mokeev, P. Lenisa, 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
Triple coincidence, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], General Physics and Astronomy, Socio-culturale, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear matter in neutron stars, Correlation, Nuclear Theory (nucl-th), 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nuclear theory, Asymmetric nuclear matter,Lepton induced nuclear reactions, Nuclear matter in neutron stars, Nucleon distribution, Nucleon-nucleon interactions, Nuclear Physics, Physics, Settore FIS/04, Direct observation, Formalism (philosophy of mathematics), Lepton induced nuclear reactions, Nucleon-nucleon interactions, Nucleon distribution, Atomic physics, Nucleon, Asymmetric nuclear matter
Abstract

We measured the triple coincidence A(e,e'np) and A(e,e'pp) reactions on carbon, aluminum, iron, and lead targets at Q2 > 1.5 (GeV/c)2, xB > 1.1 and missing momentum > 400 MeV/c. This was the first direct measurement of both proton-proton (pp) and neutron-proton (np) short-range correlated (SRC) pair knockout from heavy asymmetric nuclei. For all measured nuclei, the average proton-proton (pp) to neutron-proton (np) reduced cross-section ratio is about 6%, in agreement with previous indirect measurements. Correcting for Single-Charge Exchange effects decreased the SRC pairs ratio to ~ 3%, which is lower than previous results. Comparisons to theoretical Generalized Contact Formalism (GCF) cross-section calculations show good agreement using both phenomenological and chiral nucleon-nucleon potentials, favoring a lower pp to np pair ratio. The ability of the GCF calculation to describe the experimental data using either phenomenological or chiral potentials suggests possible reduction of scale- and scheme-dependence in cross section ratios. Our results also support the high-resolution description of high-momentum states being predominantly due to nucleons in SRC pairs., Accepted for publication in PRL. 9 pages, 3 figures, 3 tables and supplementary materials

Published
2019

5. Measurement of Unpolarized and Polarized Cross Sections for Deeply Virtual Compton Scattering on the Proton at Jefferson Laboratory with CLAS

Author

F. Cao, W. Phelps, M. Guidal, E. Pasyuk, N. Dashyan, P. Lenisa, Andrea Celentano, M. Holtrop, S. Procureur, W. Gohn, S. E. Kuhn, G. Charles, M. J. Amaryan, H. S. Jo, H. Y. Lu, H. Voskanyan, B. McKinnon, Iu. Skorodumina, Friedrich Klein, Z. W. Zhao, A. I. Ostrovidov, R. A. Montgomery, Y. Prok, F. Sabatié, David M. Keller, Maxime Defurne, B. Guegan, K. A. Griffioen, H. Hakobyan, P. Stoler, A. Kim, M. Mirazita, A. El Alaoui, A. Filippi, N. Markov, A. Fradi, Latifa Elouadrhiri, X. Wei, G. Rosner, Taya Chetry, C. A. Meyer, I. Balossino, N. Gevorgyan, S. Johnston, K. L. Giovanetti, E. L. Isupov, G. V. Fedotov, K. Hicks, Y. Ghandilyan, Nicholas Zachariou, P. Eugenio, G. Niculescu, V. Batourine, D. G. Ireland, Sergey Kuleshov, M. Ripani, A. Deur, L. Guo, T. Mineeva, K. P. Adhikari, J. A. Tan, M. L. Kabir, S. Niccolai, Volker D. Burkert, W. K. Brooks, D. P. Watts, B. S. Ishkhanov, S. Adhikari, A. S. Biselli, D. Heddle, M. Battaglieri, C. Gleason, M. Khachatryan, D. G. Jenkins, M. Ungaro, R. De Vita, G. Khachatryan, E. Golovatch, R. Dupre, K. Park, Y. Ilieva, Nikolaos Sparveris, L. Lanza, R. W. Gothe, W. Kim, I. Bedlinskiy, K. Livingston, C. Munoz Camacho, M. Hattawy, R. A. Schumacher, M. Osipenko, P. Rossi, W. J. Briscoe, A. D'Angelo, R. G. Fersch, V. P. Kubarovsky, P. Nadel-Turonski, D. Riser, M. Khandaker, S. Stepanyan, R. Paremuzyan, K. Hafidi, S. Bültmann, T. A. Forest, P. L. Cole, Sylvester Joosten, O. Pogorelko, S. Diehl, S. Anefalos Pereira, Avraham Klein, Nicholas M. Harrison, Gerard Gilfoyle, J. W. Price, I. J. D. MacGregor, M. Contalbrigo, Martin Wood, C. Hanretty, L. Barion, C. Salgado, M. Taiuti, J. Zhang, D. Protopopescu, Victor Mokeev, Z. Akbar, M. Garçon, E. Voutier, Y. G. Sharabian, G. Ciullo, J. P. Ball, D. S. Carman, A. Rizzo, A. Movsisyan, L. El Fassi, Zein-Eddine Meziani, M. E. McCracken, F. X. Girod, O. Cortes, S. Boiarinov, Chaden Djalali, G. D. Smith, S. Strauch, G. Gavalian, B. A. Clary, N. Hirlinger Saylor, Michael Paolone, N. A. Baltzell, K. Joo, H. Egiyan, 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), 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 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 p: deep inelastic scattering, interference: Bethe-Heitler, Nuclear and High Energy Physics, generalized parton distribution, Proton, accelerator, electron: polarized beam, Hadronic Physics and QCD, FOS: Physical sciences, Socio-culturale, parton: distribution function, Parton, Newport News CEBAF Linac, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], momentum transfer dependence, 01 natural sciences, beam: energy, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, x-dependence, Nuclear physics, Cross section (physics), High Energy Physics - Experiment (hep-ex), spectrometer: acceptance, High Energy Physics - Phenomenology (hep-ph), deeply virtual Compton scattering, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, Spectrometer, 010308 nuclear & particles physics, Compton scattering, cross section: difference, HERA, magnetic spectrometer, photon: electroproduction, High Energy Physics - Phenomenology, kinematics, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Nucleon, channel cross section: measured, experimental results
Abstract

This paper reports the measurement of polarized and unpolarized cross sections for the ep -> e'p' reaction, which is comprised of Deeply Virtual Compton Scattering (DVCS) and Bethe-Heitler (BH) processes, at an electron beam energy of 5.88 GeV at the Thomas Jefferson National Accelerator Facility using the Large Acceptance Spectrometer CLAS. The unpolarized cross sections and polarized cross section differences have been measured over broad kinematics, 0.10 < x_B < 0.58, 1.0 < Q^2 < 4.8 GeV^2, and 0.09 < -t < 2.00 GeV^2. The results are found to be consistent with previous CLAS data, and these new data are discussed in the framework of the generalized parton distribution approach. Calculations with two widely used phenomenological models, denoted VGG and KMSC, are approximately compatible with the experimental results over a large portion of the kinematic range of the data., 27 pages, 24 figures, Accepted for publication in PRC

Published
2018

6. First measurement of $\Xi^-$ polarization in photoproduction

Author

K. Livingston, M. Hattawy, Taya Chetry, Jie Zhang, A. Kim, L. Guo, Alessandro Rizzo, W. Kim, G. Niculescu, R. Paremuzyan, Lorenzo Zana, N. Dashyan, Nicholas M. Harrison, R. A. Schumacher, Maxime Defurne, Yordanka Ilieva, C. Djalali, J. A. Tan, K. A. Griffioen, C. Salgado, V. Crede, D. Sokhan, D. I. Glazier, L. Barion, P. Eugenio, Michael Dugger, R. A. Montgomery, R. De Vita, E. Golovatch, A. El Alaoui, M. Taiuti, Nicholas Zachariou, M. Osipenko, J. Bono, A. Fradi, M. L. Kabir, H. Egiyan, F. Cao, I. Bedlinskiy, Iu. Skorodumina, S. Stepanyan, G. Charles, M. Ungaro, E. L. Isupov, B. A. Clary, C. Munoz Camacho, G. Rosner, X. Wei, P. Lenisa, Y. Prok, S. Strauch, M. Battaglieri, F. Sabatié, W. Gohn, D. Protopopescu, Z. W. Zhao, N. Markov, K. Hicks, M. Bashkanov, S. Adhikari, B. McKinnon, W. Phelps, G. D. Smith, M. Holtrop, N. Gevorgyan, Avraham Klein, Y. Ghandilyan, Michael Paolone, A. Celentano, R. W. Gothe, I. I. Strakovsky, E. Voutier, Rong Wang, A. Deur, M. Khachatryan, G. Ciullo, J. P. Ball, M. C. Kunkel, A. I. Ostrovidov, K. Park, D. S. Carman, G. V. Fedotov, Nikos Sparveris, D. G. Ireland, Friedrich Klein, V. Batourine, Volker D. Burkert, A. S. Biselli, T. Mineeva, William Brooks, Brian Raue, K. P. Adhikari, F. X. Girod, G. Gavalian, Y. G. Sharabian, S. Johnston, M. Ripani, H. S. Jo, G. Khachatryan, M. Contalbrigo, J. W. Price, Z. Akbar, I. J. D. MacGregor, V. P. Kubarovsky, A. D'Angelo, O. Pogorelko, L. El Fassi, Dustin Keller, Michael Wood, K. Hafidi, M. J. Amaryan, P. L. Cole, H. Voskanyan, D. Heddle, E. Pasyuk, S. Diehl, A. Filippi, M. Khandaker, 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, Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear and High Energy Physics, Photon, Meson, Hadron, Nuclear Theory, Cascade, Hyperon spectroscopy, Photoproduction, Polarization, Strange, Xi, Socio-culturale, Elementary particle, Xi-: polarization, Photon energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science::Digital Libraries, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, photoproduction: (cascade), Particle decay, polarization: measured, excited state: spectrum, CLAS, meson: exchange, 0103 physical sciences, Xi-: photoproduction, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Hyperon, hyperon: (nucleon resonance), photon: energy, Baryon, Xi-: (recoil), High Energy Physics::Experiment, polarization: induced, hyperon: photoproduction, decay: weak interaction, +K%2B+K-+Xi%22">photon p --> K+ K- Xi, 5.45 GeV, Jefferson Lab
Abstract

Despite decades of studies of the photoproduction of hyperons, both their production mechanisms and their spectra of excited states are still largely unknown. While the parity-violating weak decay of hyperons offers a means of measuring their polarization, which could help discern their production mechanisms and identify their excitation spectra, no such study has been possible for doubly strange baryons in photoproduction, due to low production cross sections. However, by making use of the reaction $\gamma p \to K^+ K^+ \Xi^-$, we have measured, for the first time, the induced polarization, $P$, and the transferred polarization from circularly polarized real photons, characterized by $C_x$ and $C_z$, to recoiling $\Xi^-$s. The data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab for photon energies from just over threshold (2.4 GeV) to 5.45 GeV. These first-time measurements are compared, and are shown to broadly agree, with model predictions in which cascade photoproduction proceeds through the decay of intermediate hyperon resonances that are produced via relativistic meson exchange, offering a new step forward in the understanding of the production and polarization of doubly-strange baryons., Comment: 9 pages, 7 figures

Published
2018

7. Probing high-momentum protons and neutrons in neutron-rich nuclei

Author

D. Bulumulla, B. S. Ishkhanov, B. A. Clary, C. E. Hyde, T. Mineeva, Adi Ashkenazi, P. Eugenio, Alexander Schmidt, K. Livingston, Pawel Nadel-Turonski, M. Taiuti, J. Arrington, Y. Prok, A. I. Ostrovidov, G. Gavalian, M. Contalbrigo, Michael Paolone, R. A. Schumacher, M. L. Kabir, A. D'Angelo, C. Munoz-Camacho, A. Beck, G. Ciullo, J. P. Ball, G. Laskaris, D. S. Carman, L. Lanza, Shalev Gilad, G. Khachatryan, A. Rizzo, F. Hauenstein, D. G. Ireland, R. G. Fersch, E. De Sanctis, S. Mey-Tal Beck, A. Movsisyan, M. Battaglieri, P. L. Cole, Z. W. Zhao, S. Stepanyan, George Davey Smith, Volker D. Burkert, A. S. Biselli, G. Charles, Nicholas M. Harrison, Gerard Gilfoyle, Y. Ilieva, Andreas Klein, J. Poudel, D. Sokhan, M. Patsyuk, K. Hicks, D. P. Watts, Taya Chetry, B. McKinnon, H. Egiyan, S. Nadeeshani, X. Wei, P. Lenisa, N. Markov, W. J. Briscoe, W. Kim, K. P. Adhikari, Douglas Higinbotham, M. Mirazita, Maxime Defurne, R. Cruz-Torres, I. Bedlinskiy, S. Niccolai, Chaden Djalali, M. Osipenko, L. El Fassi, L. Guo, D. Payette, Or Hen, Eliahu Cohen, K.A. Griffoen, B. Schmookler, M. Braverman, L. Barion, R. De Vita, A. El Alaoui, G. E. Dodge, Andrea Celentano, K. Hafidi, M. Khandaker, S. Procureur, Friedrich Klein, T. A. Forest, F. X. Girod, M. J. Amaryan, Nicholas Zachariou, F. Cao, M. Ripani, I. J. D. MacGregor, E.P. Segarra, Eli Piasetzky, I. Korover, Afroditi Papadopoulou, S. Strauch, J. W. Price, G. Rosner, A. Filippi, M. Duer, K. L. Giovanetti, O. Pogorelko, Larry Weinstein, B. Mustapha, G. Niculescu, E. Pasyuk, W. Phelps, N. Dashyan, E. L. Isupov, O. Cortes, R. W. Gothe, S. Boiarinov, Y. Ghandilyan, M. Holtrop, S. Bueltmann, Victor Mokeev, M. Ungaro, J. Zhang, D. Protopopescu, K. Joo, E. Voutier, Y. G. Sharabian, A. Kim, William Brooks, C. Marchand, V. Batourine, F. Sabatié, David M. Keller, J. A. Tan, V. Crede, R. A. Montgomery, H. Hakobyan, Laura Clark, P. Rossi, X. Zheng, M. Khachatryan, Nikolaos Sparveris, S. E. Kuhn, M. Hattawy, A. Deur, S. Adhikari, E. Golovatch, R. Dupre, K. Park, I. Balossino, H. Voskanyan, Carlos A. Salgado, 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
Quark, Multidisciplinary matter, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, EMC effect, Nuclear Theory, momentum spectrum, Socio-culturale, parton: distribution function, Electron, 7. Clean energy, 01 natural sciences, nucleon: momentum, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, CLAS, 0103 physical sciences, Neutron, 010306 general physics, Nuclear Experiment, neutron star, p nucleus: scattering, Physics, Multidisciplinary, 010308 nuclear & particles physics, electron nucleus: scattering, quantum mechanics, Nuclear shell model, shell model, correlation, Atomic nucleus, Nucleon
Abstract

International audience; The atomic nucleus is one of the densest and most complex quantum-mechanical systems in nature. Nuclei account for nearly all the mass of the visible Universe. The properties of individual nucleons (protons and neutrons) in nuclei can be probed by scattering a high-energy particle from the nucleus and detecting this particle after it scatters, often also detecting an additional knocked-out proton. Analysis of electron- and proton-scattering experiments suggests that some nucleons in nuclei form close-proximity neutron–proton pairs 1$^{–}$12 with high nucleon momentum, greater than the nuclear Fermi momentum. However, how excess neutrons in neutron-rich nuclei form such close-proximity pairs remains unclear. Here we measure protons and, for the first time, neutrons knocked out of medium-to-heavy nuclei by high-energy electrons and show that the fraction of high-momentum protons increases markedly with the neutron excess in the nucleus, whereas the fraction of high-momentum neutrons decreases slightly. This effect is surprising because in the classical nuclear shell model, protons and neutrons obey Fermi statistics, have little correlation and mostly fill independent energy shells. These high-momentum nucleons in neutron-rich nuclei are important for understanding nuclear parton distribution functions (the partial momentum distribution of the constituents of the nucleon) and changes in the quark distributions of nucleons bound in nuclei (the EMC effect) 1$^{,}$13$^{,}$14 . They are also relevant for the interpretation of neutrino-oscillation measurements 15 and understanding of neutron-rich systems such as neutron stars 3$^{,}$16 .

Published
2018

8. Double $K_S^0$ Photoproduction off the Proton at CLAS

Author

W. Gohn, Pawel Nadel-Turonski, R. Paremuzyan, R. A. Schumacher, N. Markov, P. Eugenio, Nicholas M. Harrison, D. G. Jenkins, Gerard Gilfoyle, D. Sokhan, E. Golovatch, R. Dupre, I. Bedlinskiy, M. L. Kabir, L. Lanza, C. Munoz Camacho, M. Battaglieri, M. Bashkanov, B. McKinnon, X. Wei, C. A. Meyer, F. X. Girod, Y. Ilieva, G. V. Fedotov, H. Egiyan, L. Guo, A. D'Angelo, C. Hanretty, S. Niccolai, I. I. Strakovsky, P. Lenisa, K. P. Adhikari, Chaden Djalali, Avraham Klein, A. Simonyan, A. Deur, Laura Clark, E. De Sanctis, Iu. Skorodumina, G. Khachatryan, W. Kim, K. Park, W. Phelps, Sylvester Joosten, A. Fradi, K. Joo, W. J. Briscoe, G. Charles, M. Osipenko, Barry Ritchie, W. K. Brooks, S. Adhikari, Friedrich Klein, Brian Raue, J. Zhang, D. Protopopescu, E. Voutier, Y. G. Sharabian, S. Chandavar, S. Strauch, Y. Prok, T. Mineeva, G. Ciullo, J. P. Ball, D. S. Carman, Maxime Defurne, V. Crede, A. Rizzo, G. Rosner, G. Gavalian, F. Sabatié, D. I. Glazier, K. A. Griffioen, M. C. Kunkel, S. Johnston, David M. Keller, V. P. Kubarovsky, Y. Ghandilyan, Carlos A. Salgado, M. Khachatryan, R. De Vita, K. Livingston, M. Hattawy, K. Hicks, A. Movsisyan, E. L. Isupov, D. Riser, H. Hakobyan, Nikolaos Sparveris, Michael Paolone, M. Khandaker, A. I. Ostrovidov, D. G. Ireland, S. Stepanyan, Volker D. Burkert, A. S. Biselli, Andrea Celentano, A. El Alaoui, Nicholas Zachariou, M. Ripani, F. Cao, M. Guidal, G. Niculescu, E. Pasyuk, N. Dashyan, M. Holtrop, D. P. Weygand, I. Balossino, Taya Chetry, George Davey Smith, J. W. Price, M. Ungaro, L. El Fassi, M. Contalbrigo, Z. Akbar, O. Pogorelko, I. J. D. MacGregor, P. L. Cole, Z. W. Zhao, M. E. McCracken, Victor Mokeev, R. W. Gothe, L. Barion, A. Filippi, D. Heddle, K. Hafidi, J. T. Goetz, 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, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Nuclear and High Energy Physics, Meson, Proton, Dalitz plot, FOS: Physical sciences, Socio-culturale, Photon energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], time-of-flight, 01 natural sciences, Resonance (particle physics), Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, mass spectrum, p: target, background: low, CLAS, 0103 physical sciences, mixing, Invariant mass, Nuclear Experiment (nucl-ex), [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Glueball, background, meson resonance, photon: energy, momentum transfer: measured, Automatic Keywords, glueball, meson: photoproduction, Mass spectrum, baryon: hadron spectroscopy, High Energy Physics::Experiment, missing-mass, photoproduction, experimental results
Abstract

The $f_0$(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the $f_0$(1500) via decay into the $K_S^0 K_S^0$ channel using the CLAS detector. The reaction $��p$ -> $f_0 p$ -> $K_S^0 K_S^0 p$, where J = 0, 2, was measured with photon energies from 2.7 to 5.1 GeV. A clear peak is seen at 1500 MeV in the background subtracted invariant mass spectra of the two kaons. This is enhanced if the measured 4-momentum transfer to the proton target is restricted to be less than 1.0 GeV2. By comparing data with simulations, it can be concluded that the peak at 1500 MeV is produced primarily at low t, which is consistent with a t-channel production mechanism., 12 pages, 12 figures

Published
2018

9. First measurement of the helicity asymmetry E in η photoproduction on the proton

Author

K. A. Griffioen, K. Livingston, B. McKinnon, H. Hakobyan, C. Hanretty, S. Strauch, Latifa Elouadrhiri, C. A. Meyer, G. V. Fedotov, E. De Sanctis, I. Bedlinskiy, S. Chandavar, L. Colaneri, J. Brock, K. P. Adhikari, E. Golovatch, R. Dupre, D. I. Sober, M. C. Kunkel, V. Batourine, M. L. Seely, I. Zonta, Iu. Skorodumina, X. Wei, V. Crede, S. Pisano, Victor Mokeev, I. I. Strakovsky, E. Voutier, F. Sabatié, M. Ripani, D. I. Glazier, H. Egiyan, M. Ungaro, A. Deur, R. A. Montgomery, P. Stoler, Barry Ritchie, A. Simonyan, I. Senderovich, P. Lenisa, Z. W. Zhao, R. De Vita, Diane Schott, W. K. Brooks, A. El Alaoui, Y. Ilieva, K. Hicks, H. S. Jo, K. L. Giovanetti, Gerard Gilfoyle, K. Joo, C. D. Keith, Nicholas Zachariou, K. Park, N. K. Walford, D. G. Ireland, L. Guo, D. G. Jenkins, H. Jiang, Volker D. Burkert, A. S. Biselli, Sylvester Joosten, Michael Dugger, I. J. D. MacGregor, S. Anefalos Pereira, V. P. Kubarovsky, R. A. Badui, S. Park, N. Dashyan, A. Filippi, F. X. Girod, O. Pogorelko, S. M. Hughes, J. Zhang, W. Phelps, P. Nadel-Turonski, M. Khandaker, O. Cortes, W. Gohn, A. Celentano, R. W. Gothe, Ye Tian, Dustin Keller, Friedrich Klein, S. Boiarinov, D. G. Meekins, A. D'Angelo, J. W. Price, C. Djalali, Michael Wood, K. Hafidi, D. Rönchen, E. Seder, M. Contalbrigo, P. Mattione, P. Peng, L. El Fassi, C. Munoz Camacho, J. T. Goetz, R. Tucker, H. Voskanyan, P. L. Cole, E. Pasyuk, Z. Akbar, Lorenzo Zana, J. P. Ball, Y. Prok, P. Roy, D. Adikaram, M. Guidal, D. S. Carman, A. Rizzo, S. Niccolai, C. Salgado, G. D. Smith, M. Holtrop, A. Movsisyan, M. Battaglieri, S. Fegan, A. Kim, G. Charles, T. Mineeva, B. Morrison, V. Sytnik, P. Eugenio, B. S. Ishkhanov, R. A. Schumacher, P. Collins, B. Garillon, Michael Döring, D. Ho, S. Stepanyan, A. Fradi, H. Y. Lu, Andrew Puckett, Nikolaos Sparveris, I. Niculescu, J. A. Fleming, L. A. Net, C. Carlin, G. Rosner, M. Osipenko, Y. Ghandilyan, G. Khachatryan, W. J. Briscoe, G. Niculescu, M. Hattawy, N. A. Baltzell, 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), CLAS Collaboration, 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
Particle physics, Nuclear and High Energy Physics, Meson, media_common.quotation_subject, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, NO, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, 0103 physical sciences, Eta photoproduction, ddc:530, Helicity asymmetry, Polarization observable, 010306 general physics, Nuclear Experiment, QC, media_common, Physics, Quantitative Biology::Biomolecules, 010308 nuclear & particles physics, Bremsstrahlung, Resonance, Observable, Helicity, lcsh:QC1-999, Baryon, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, lcsh:Physics
Abstract

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the η photoproduction reaction γp→ηp. Data were obtained using the FROzen Spin Target (FROST) with the CLAS spectrometer in Hall B at Jefferson Lab, covering a range of center-of-mass energy W from threshold to 2.15 GeV and a large range in center-of-mass polar angle. As an initial application of these data, the results have been incorporated into the Jülich–Bonn model to examine the case for the existence of a narrow N⁎ resonance between 1.66 and 1.70 GeV. The addition of these data to the world database results in marked changes in the predictions for the E observable from that model. Further comparison with several theoretical approaches indicates these data will significantly enhance our understanding of nucleon resonances. Keywords: Eta photoproduction, Polarization observable, Helicity asymmetry

Published
2016

10. Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

Author

H S, Jo, F X, Girod, H, Avakian, V D, Burkert, M, Garçon, M, Guidal, V, Kubarovsky, S, Niccolai, P, Stoler, K P, Adhikari, D, Adikaram, M J, Amaryan, M D, Anderson, S, Anefalos Pereira, J, Ball, N A, Baltzell, M, Battaglieri, V, Batourine, I, Bedlinskiy, A S, Biselli, S, Boiarinov, W J, Briscoe, W K, Brooks, D S, Carman, A, Celentano, S, Chandavar, G, Charles, L, Colaneri, P L, Cole, N, Compton, M, Contalbrigo, V, Crede, A, D'Angelo, N, Dashyan, R, De Vita, E, De Sanctis, A, Deur, C, Djalali, R, Dupre, A El, Alaoui, L El, Fassi, L, Elouadrhiri, G, Fedotov, S, Fegan, A, Filippi, J A, Fleming, B, Garillon, N, Gevorgyan, Y, Ghandilyan, G P, Gilfoyle, K L, Giovanetti, J T, Goetz, E, Golovatch, R W, Gothe, K A, Griffioen, B, Guegan, N, Guler, L, Guo, K, Hafidi, H, Hakobyan, N, Harrison, M, Hattawy, K, Hicks, N, Hirlinger Saylor, D, Ho, M, Holtrop, S M, Hughes, Y, Ilieva, D G, Ireland, B S, Ishkhanov, D, Jenkins, K, Joo, S, Joosten, D, Keller, G, Khachatryan, M, Khandaker, A, Kim, W, Kim, A, Klein, F J, Klein, S E, Kuhn, S V, Kuleshov, P, Lenisa, K, Livingston, H Y, Lu, I J D, MacGregor, B, McKinnon, Z E, Meziani, M, Mirazita, V, Mokeev, R A, Montgomery, H, Moutarde, A, Movsisyan, E, Munevar, C, Munoz Camacho, P, Nadel-Turonski, L A, Net, G, Niculescu, M, Osipenko, A I, Ostrovidov, M, Paolone, K, Park, E, Pasyuk, J J, Phillips, S, Pisano, O, Pogorelko, J W, Price, S, Procureur, Y, Prok, A J R, Puckett, B A, Raue, M, Ripani, A, Rizzo, G, Rosner, P, Rossi, P, Roy, F, Sabatié, C, Salgado, D, Schott, R A, Schumacher, E, Seder, A, Simonyan, Iu, Skorodumina, G D, Smith, D, Sokhan, N, Sparveris, S, Stepanyan, I I, Strakovsky, S, Strauch, V, Sytnik, Ye, Tian, S, Tkachenko, M, Ungaro, H, Voskanyan, E, Voutier, N K, Walford, D P, Watts, X, Wei, L B, Weinstein, M H, Wood, N, Zachariou, L, Zana, J, Zhang, Z W, Zhao, I, Zonta, 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, Rensselaer Polytechnic Institute (RPI), Old Dominion University [Norfolk] (ODU), Argonne National Laboratory [Lemont] (ANL), Universidad Tecnica Federico Santa Maria [Valparaiso] (UTFSM), University of Connecticut (UCONN), Ohio University, Carnegie Mellon University [Pittsburgh] (CMU), 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
Particle physics, Photon, Proton, HERA, General Physics and Astronomy, Socio-culturale, FOS: Physical sciences, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, High Energy Physics - Experiment (hep-ex), CLAS, virtual compton scattering, Twist, Nuclear Experiment (nucl-ex), VIRTUAL COMPTON-SCATTERING, NUCLEON, Nuclear Experiment, Quantum chromodynamics, Physics, 3. Good health, Phase space, virtual compton scattering, nucleon, High Energy Physics::Experiment, Nucleon
Abstract

Unpolarized and beam-polarized four-fold cross sections $\frac{d^4 \sigma}{dQ^2 dx_B dt d\phi}$ for the $ep\to e^\prime p^\prime \gamma$ reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 ($Q^2,x_B,t$) bins over the widest phase space ever explored in the valence-quark region. Several models of Generalized Parton Distributions (GPDs) describe the data well at most of our kinematics. This increases our confidence that we understand the GPD $H$, expected to be the dominant contributor to these observables. Through a leading-twist extraction of Compton Form Factors, these results reveal a tomographic image of the nucleon., Comment: 7 pages, 5 figures

Published
2015

11. $\phi$-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

12. 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

13. 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

14. 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

15. Photoproduction of pi+pi- meson pairs on the proton

Author

A. V. Vlassov, M. J. Amaryan, S. L. Careccia, E. Golovatch, W. Kim, R. De Vita, K. L. Giovanetti, D. Protopopescu, Martin K. Mayer, Larry Weinstein, D. P. Watts, H. Egiyan, S. Pozdniakov, M. Garçon, P. Khetarpal, Lorenzo Zana, G. E. Dodge, H. Y. Lu, Adam P. Szczepaniak, A. D'Angelo, I. Niculescu, C. S. Nepali, J. T. Goetz, K. Livingston, D. S. Dale, H. Hakobyan, L. Gan, M. Battaglieri, E. De Sanctis, Saini, Diane Schott, A. Deur, C. Hanretty, I. Nakagawa, A. I. Ostrovidov, B. Zhao, S. Fegan, D. I. Sober, K. Park, M. Y. Gabrielyan, L. Bibrzycki, A.V. Stavinsky, M. Khandaker, C. Bookwalter, D. G. Ireland, K. Moriya, P. Stoler, D. J. Tedeschi, Volker D. Burkert, A. S. Biselli, E. Wolin, Sergey Kuleshov, M. Osipenko, K. A. Griffioen, D. Doughty, Y. Prok, Gerard Gilfoyle, D. S. Carman, P. Eugenio, M. Taiuti, O. Glamazdin, K. Hicks, I. Bedlinskiy, A. Fradi, A. Gasparian, M. Kossov, Andreas Klein, D. Sokhan, N. Dashyan, J. Goett, B. McKinnon, Mokeev, M. Guidal, Barry Ritchie, Yordanka Ilieva, N. Hassall, M. Bellis, S. Park, K. Mikhailov, W. Gohn, S. Dhamija, D. Branford, S. Pisano, P. Collins, M. Mirazita, A. Teymurazyan, H. Baghdasaryan, R. W. Gothe, Leonard Lesniak, F. Sabatié, P. Rossi, J. M. Laget, Niroula, M. Holtrop, A. Daniel, E. L. Isupov, Crede, SA Pereira, Michael L. Williams, C. A. Meyer, G. V. Fedotov, S. Niccolai, S. Tkachenko, Mark W. Paris, M. Ripani, Carlos A. Salgado, Mochalov, M. Anghinolfi, K. P. Adhikari, Kuznetsov, D. P. Weygand, N. Pivnyuk, Michael Vineyard, C. Djalali, Drozdov, H. Seraydaryan, Y. G. Sharabian, P. L. Cole, Z. W. Zhao, M. E. McCracken, P. Nadel-Turonski, L. Guo, M. Ungaro, K. Joo, S. S. Stepanyan, C. E. Hyde, G. Rosner, J. Zhang, J. W. Price, R. A. Schumacher, G. Ricco, S. Stepanyan, W. J. Briscoe, E. Pasyuk, Brian Raue, Frank Klein, E. Munevar, Dustin Keller, A. Kubarovsky, Johnstone, Strakovsky, E. Clinton, Michael Wood, K. Hafidi, T. Mineeva, O. Pogorelko, Kubarovsky, F. X. Girod, S. Strauch, 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
PI-PI-DYNAMICS, COUPLED-CHANNEL, DIFFRACTION DISSOCIATION, POLARIZED PHOTONS, HIGH-STATISTICS, GEV-C, SYSTEM, MODEL, CLAS, CHAMBER, Nuclear and High Energy Physics, Particle physics, Meson, Proton, PI-PI-DYNAMICS, Photon energy, 01 natural sciences, 7. Clean energy, POLARIZED PHOTONS, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Particle decay, Pion, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nuclear Experiment, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, DIFFRACTION DISSOCIATION, Momentum transfer, COUPLED-CHANNEL, HIGH-STATISTICS, GEV-C, SYSTEM, MODEL, CHAMBER, Production (computer science), High Energy Physics::Experiment
Abstract

The exclusive reaction $$\gamma p \to p \pi^+ \pi^-$$ was studied in the photon energy range 3.0 - 3.8 GeV and momentum transfer range $0.4

Published
2009

16. Measurement of inclusive spin structure functions of the deuteron

Author

J. Yun, S. E. Kuhn, G. E. Dodge, T. A. Forest, M. Taiuti, G. S. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, W. Bertozzi, N. Bianchi, A. S. Biselli, S. Boiarinov, P. Bosted, S. Bouchigny, R. Bradford, D. Branford, W. K. Brooks, S. Bueltmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, D. S. Carman, B. Carnahan, C. Cetina, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. Cummings, E. De Sanctis, R. De Vita, P. V. Degtyarenko, R. A. Demirchyan, H. Denizli, L. C. Dennis, K. V. Dharmawardane, C. Djalali, J. Domingo, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, Y. V. Efremenko, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, K. Fissum, A. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, G. Gavalian, V. B. Gavrilov, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, C. I. O. Gordon, K. A. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, M. M. Ito, D. Jenkins, K. Joo, C. Keith, J. H. Kelley, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, G. A. Leksin, K. Loukachine, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. W. C. McNabb, J. McCarthy, B. A. Mecking, M. D. Mestayer, C. A. Meyer, R. Minehart, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, V. Muccifora, J. Mueller, L. Y. Murphy, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, G. Niculescu, B. Niczyporuk, R. A. Niyazov, M. Nozar, G. V. O’Rielly, M. S. Ohandjanyan, A. Opper, M. Ossipenko, K. Park, Y. Patois, G. A. Peterson, S. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. W. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, J. Shaw, S. M. Shuvalov, S. Simionatto, A. Skabelin, E. S. Smith, L. C. Smith, T. Smith, D. I. Sober, L. Sorrell, M. Spraker, S. Stepanyan, P. Stoler, S. Taylor, D. Tedeschi, U. Thoma, R. Thompson, L. Todor, T. Y. Tung, C. Tur, M. F. Vineyard, A. Vlassov, K. Wang, L. B. Weinstein, H. Weller, R. Welsh, D. P. Weygand, S. Whisnant, M. Witkowski, E. Wolin, M. H. Wood, A. Yegneswaran, B. Zhang, J. Zhao, Z. Zhou, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, and Robert, Suzanne

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, FOS: Physical sciences, Spin structure, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Deuterium, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We report the results of a new measurement of spin structure functions of the deuteron in the region of moderate momentum transfer ($Q^2$ = 0.27 -- 1.3 (GeV/c)$^2$) and final hadronic state mass in the nucleon resonance region ($W$ = 1.08 -- 2.0 GeV). We scattered a 2.5 GeV polarized continuous electron beam at Jefferson Lab off a dynamically polarized cryogenic solid state target ($^{15}$ND$_3$) and detected the scattered electrons with the CEBAF Large Acceptance Spectrometer (CLAS). From our data, we extract the longitudinal double spin asymmetry $A_{||}$ and the spin structure function $g_1^d$. Our data are generally in reasonable agreement with existing data from SLAC where they overlap, and they represent a substantial improvement in statistical precision. We compare our results with expectations for resonance asymmetries and extrapolated deep inelastic scaling results. Finally, we evaluate the first moment of the structure function $g_1^d$ and study its approach to both the deep inelastic limit at large $Q^2$ and to the Gerasimov-Drell-Hearn sum rule at the real photon limit ($Q^2 \to 0$). We find that the first moment varies rapidly in the $Q^2$ range of our experiment and crosses zero at $Q^2$ between 0.5 and 0.8 (GeV/c)$^2$, indicating the importance of the $\Delta$ resonance at these momentum transfers., Comment: 13 pages, 8 figures, ReVTeX 4, final version as accepted by Phys. Rev. C

Published
2003

Catalog

Books, media, physical & digital resources
See catalog results