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1. High precision measurement of Compton scattering in the 5 GeV region

Author: P. Ambrozewicz, L. Ye, Y. Prok, I. Larin, A. Ahmidouch, K. Baker, V. Baturin, L. Benton, A. Bernstein, V. Burkert, E. Clinton, P.L. Cole, P. Collins, D. Dale, S. Danagoulian, G. Davidenko, R. Demirchyan, A. Deur, A. Dolgolenko, D. Dutta, G. Dzyubenko, A. Evdokimov, G. Fedotov, J. Feng, M. Gabrielyan, L. Gan, H. Gao, A. Gasparian, N. Gevorkyan, S. Gevorkyan, A. Glamazdin, V. Goryachev, L. Guo, V. Gyurjyan, K. Hardy, J. He, E. Isupov, M.M. Ito, L. Jiang, H. Kang, D. Kashy, M. Khandaker, P. Kingsberry, F. Klein, A. Kolarkar, M. Konchatnyi, O. Korchin, W. Korsch, O. Kosinov, S. Kowalski, M. Kubantsev, A. Kubarovsky, V. Kubarovsky, D. Lawrence, X. Li, M. Levillain, H. Lu, L. Ma, P. Martel, V. Matveev, D. McNulty, B. Mecking, A. Micherdzinska, B. Milbrath, R. Minehart, R. Miskimen, V. Mochalov, B. Morrison, S. Mtingwa, I. Nakagawa, S. Overby, E. Pasyuk, M. Payen, K. Park, R. Pedroni, W. Phelps, D. Protopopescu, D. Rimal, B.G. Ritchie, D. Romanov, C. Salgado, A. Shahinyan, A. Sitnikov, D. Sober, S. Stepanyan, W. Stephens, V. Tarasov, S. Taylor, A. Teymurazyan, J. Underwood, A. Vasiliev, V. Vishnyakov, D.P. Weygand, M. Wood, Y. Zhang, S. Zhou, and B. Zihlmann
Subjects: Physics, QC1-999
Abstract: The cross section of atomic electron Compton scattering γ+e→γ′+e′ was measured in the 4.400–5.475 GeV photon beam energy region by the PrimEx collaboration at Jefferson Lab with an accuracy of 2.6% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV.
Published: 2019
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2. Component based dataflow processing framework.

Author: V. Gyurjyan, Aron Bartle, Constantine Lukashin, S. Mancilla, R. Oyarzun, and A. Vakhnin
Published: 2015
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3. ERSAP: Towards Better NP Data-Stream Analytics with Flow-Based Programming

Author: V. Gyurjyan, D. Abbott, N. Brei, M. Goodrich, G. Heyes, E. Jastrzembski, D. Lawrence, B. Raydo, and C. Timmer
Subjects: Nuclear and High Energy Physics, Nuclear Energy and Engineering, Electrical and Electronic Engineering
Published: 2023

4. The CLAS12 Spectrometer at Jefferson Laboratory

Author: C. W. Kim, H. Avakian, D. Protopopescu, D. Heddle, M. Contalbrigo, M. L. Kabir, H. Voskanyan, E. Voutier, T. Chetry, M. Zarecky, J. Poudel, I. Illari, B. A. Clary, M. Osipenko, D. Insley, D. P. Watts, I. Bedlinskiy, Michael Paolone, V. Sergeyeva, D. Kashy, M. Khachatryan, F. Hauenstein, V. Mascagna, Nikolaos Sparveris, F. Bossu, D. Marchand, W. Kim, G. Niculescu, P. Bonneau, G. Charles, P. Hemler, Ruben J. Fair, P. Moran, Dustin Keller, C. Ayerbe Gayoso, Nicholas Zachariou, M. Ungaro, C. Munoz Camacho, M. J. Amaryan, G. Rosner, I. J. D. MacGregor, T. A. Forest, V. Lucherini, S. E. Kuhn, Y. Prok, M. Hattawy, S. Stepanyan, Michael Wood, K. Hafidi, M. D. Mestayer, S. Lee, M. Wiseman, F. Sabatié, R. Paremuzyan, N. Dashyan, A. Deur, K. Hicks, K. Joo, E. L. Isupov, N. A. Baltzell, R. W. Gothe, S. Christo, L. C. Smith, B. S. Ishkhanov, Latifa Elouadrhiri, V. Baturin, Nicholas M. Harrison, Gerard Gilfoyle, M. McMullen, G. E. Dodge, H. S. Jo, R. Johnston, A. Yegneswaran, K. Livingston, A. Lung, P. Stoler, M. Guidal, D. Sokhan, K. Price, Aditya R. Khanal, K. P. Adhikari, Jie Zhang, K. Bruhwel, S. Adhikari, S. Boyarinov, B. McKinnon, M. Ehrhart, M. Leali, Z. W. Zhao, S. Joosten, B. J. Roy, V. P. Kubarovsky, J. Newton, P. Chatagnon, G. V. Fedotov, D. Tilles, M.A. Antonioli, Renuka Rajput-Ghoshal, G. D. Smith, M. Holtrop, C. Cuevas, V. Gyurjyan, Probir K. Ghoshal, Yordanka Ilieva, H. Hakobyan, Alexander Schmidt, Luciano Pappalardo, Andrea Bianconi, W. J. Briscoe, M. Turisini, M. Mirazita, D. I. Glazier, M. Garçon, M. Ripani, F. X. Girod, A. Filippi, K. L. Giovanetti, R. Miller, J. Ritman, S. Diehl, R. De Vita, C. D. Keith, Y. G. Sharabian, M. Lowry, M. Defurne, E. Pasyuk, P. Naidoo, J. Hogan, N. Markov, Or Hen, C. Salgado, M. Taylor, G. Young, S. Strauch, Larry Weinstein, H. Atac, Chaden Djalali, A. Hobart, A. Kim, Z. E. Meziani, S. Schadmand, U. Shrestha, T. Ewing, T. Mineeva, O. Pogorelko, S. Nanda, L. Barion, G. Angelini, J. Rowley, P. Rossi, M. Leffel, William Brooks, I. Mandjavidze, L. Venturelli, Iu. Skorodumina, Y. Gotra, C. Mealer, J. W. Price, S. Aune, C. Wiggins, D. G. Ireland, G. Gavalian, G. Jacobs, V. Crede, Volker D. Burkert, A. S. Biselli, O. Pastor, Victor Mokeev, E.P. Segarra, Ross Milner, N. Tyler, J. A. Tan, E. Golovatch, R. Dupre, W. Phelps, Andrea Celentano, S. Procureur, M. Cook, G. Ciullo, M. Battaglieri, D. S. Carman, B. Raydo, A. Rizzo, X. Wei, R. Cruz-Torres, S. Niccolai, K. A. Griffioen, B. Eng, A. Movsisyan, P. L. Cole, L. Lanza, G. Christiaens, A. D'Angelo, T. Kageya, L. El Fassi, P. Lenisa, V. Ziegler, C. Hanretty, D. Anderson, T. B. Hayward, Brian Raue, Fatiha Benmokhtar, O. Soto, 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), 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: Physics::Instrumentation and Detectors, data acquisition, magnet: solenoid, superconductivity: torus, Solenoid, 01 natural sciences, Particle identification, Luminosity, momentum resolution, electron: beam, Nuclear Experiment, Instrumentation, QC, Physics, Luminosity (scattering theory), Settore FIS/04, Detector, Magnetic spectrometer, magnet: torus, performance, Nuclear and High Energy Physics, Meson, vertex detector, nucleon: interaction, CLAS12, Electromagnetic physics, Large acceptance, Socio-culturale, fabrication, beam: energy, Nuclear physics, PE2_1, CLAS, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, PE2_3, scintillation counter, Cherenkov radiation, detector: design, activity report, Spectrometer, 010308 nuclear & particles physics, nucleus, CLAS12, Electromagnetic physics, Large acceptance, Luminosity, Magnetic spectrometer, magnet: superconductivity, magnetic spectrometer, electromagnetic physics, large acceptance, luminosity, neutral particle, Automatic Keywords, calorimeter: electromagnetic, Cherenkov counter, spectrometer, particle identification, Beam (structure)
Abstract: International audience; The CEBAF Large Acceptance Spectrometer for operation at 12 GeV beam energy (CLAS12) in Hall B at Jefferson Laboratory is used to study electro-induced nuclear and hadronic reactions. This spectrometer provides efficient detection of charged and neutral particles over a large fraction of the full solid angle. CLAS12 has been part of the energy-doubling project of Jefferson Lab’s Continuous Electron Beam Accelerator Facility, funded by the United States Department of Energy. An international collaboration of 48 institutions contributed to the design and construction of detector hardware, developed the software packages for the simulation of complex event patterns, and commissioned the detector systems. CLAS12 is based on a dual-magnet system with a superconducting torus magnet that provides a largely azimuthal field distribution that covers the forward polar angle range up to 35 ∘ , and a solenoid magnet and detector covering the polar angles from 35° to 125° with full azimuthal coverage. Trajectory reconstruction in the forward direction using drift chambers and in the central direction using a vertex tracker results in momentum resolutions of < 1% and < 3%, respectively. Cherenkov counters, time-of-flight scintillators, and electromagnetic calorimeters provide good particle identification. Fast triggering and high data-acquisition rates allow operation at a luminosity of 1035 cm −2 s −1 . These capabilities are being used in a broad program to study the structure and interactions of nucleons, nuclei, and mesons, using polarized and unpolarized electron beams and targets for beam energies up to 11 GeV. This paper gives a general description of the design, construction, and performance of CLAS12.
Published: 2020

5. The CLAS12 software framework and event reconstruction

Author: Maxime Defurne, D. I. Glazier, R. De Vita, F. Bossu, D. S. Carman, A. Hobart, M. D. Mestayer, Y. Gotra, M. Ungaro, N. A. Baltzell, P. Chatagnon, M. Contalbrigo, S. Joosten, W. Phelps, A. Kim, S. Niccolai, V. Gyurjyan, Gagik Gavalian, V. Ziegler, D. Heddle, Nicholas M. Harrison, Gerard Gilfoyle, D. Sokhan, J. Newton, N. Markov, S. Mancilla, 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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: Scheme (programming language), Nuclear and High Energy Physics, Hadronic physics, computer.software_genre, 01 natural sciences, Software, 0103 physical sciences, Electron scattering, [INFO]Computer Science [cs], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Nuclear Experiment, Instrumentation, computer.programming_language, Event reconstruction, Physics, Data processing, Spectrometer, 010308 nuclear & particles physics, business.industry, Detector, Software framework, Identification (information), Computer engineering, Event reconstruction software, business, computer
Abstract: International audience; We describe offline event reconstruction for the CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12), including an overview of the offline reconstruction framework and software tools, a description of the algorithms developed for the individual detector subsystems, and the overall approach for charged and neutral particle identification. We also present the scheme for data processing and the code management procedures.
Published: 2020

6. High precision measurement of Compton scattering in the 5 GeV region

Author: M. Konchatnyi, D. McNulty, Ashot Gasparian, K. Hardy, S. Stepanyan, L. Guo, S. Kowalski, R. A. Miskimen, P. P. Martel, A. Sitnikov, E. Clinton, L. Benton, H. Y. Lu, D. Lawrence, L. Ye, Dipangkar Dutta, A. M. Micherdzinska, M. Wood, A. Shahinyan, R. Demirchyan, A. Deur, A. Ahmidouch, X. Li, S. R. Gevorkyan, S. Mtingwa, V. V. Mochalov, A. Dolgolenko, J. Feng, D. Kashy, B. Zihlmann, S. Overby, A. Evdokimov, Brian D. Milbrath, Y. Zhang, M. Levillain, W. Phelps, B. Morrison, D. I. Sober, P. Collins, I. Nakagawa, A. V. Glamazdin, H. Kang, Aron M. Bernstein, B. A. Mecking, L. Jiang, Wolfgang Korsch, G. Dzyubenko, Haiyan Gao, V. Baturin, M. M. Ito, V. Gyurjyan, K. Park, S. Taylor, P. L. Cole, Volker D. Burkert, S. Zhou, L. Gan, O. Kosinov, V. Goryachev, C. Salgado, I. Larin, N. Gevorkyan, A. Kolarkar, Andrey Vasiliev, J. Underwood, R. C. Minehart, A. Teymurazyan, G. V. Fedotov, G. Davidenko, W. A. Stephens, Dmitri Romanov, J. He, K. Baker, S. Danagoulian, E. Pasyuk, Friedrich Klein, E. L. Isupov, P. Ambrozewicz, D. P. Weygand, O. Korchin, A. Kubarovsky, Y. Prok, Barry Ritchie, V. P. Kubarovsky, V. Vishnyakov, M. Payen, P. Kingsberry, V. E. Tarasov, L. Ma, D. Protopopescu, D. Rimal, D. S. Dale, V. Matveev, M. Khandaker, R.S. Pedroni, M. Gabrielyan, and M. A. Kubantsev
Subjects: Nuclear and High Energy Physics, Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Electron, 01 natural sciences, 7. Clean energy, Nuclear Theory (nucl-th), Nuclear physics, Cross section (physics), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Radiative transfer, Nuclear Experiment (nucl-ex), Photon beam, 010306 general physics, Nuclear Experiment, Nuclear theory, Physics, 010308 nuclear & particles physics, Compton scattering, lcsh:QC1-999, High Energy Physics - Phenomenology, Beam energy, Beam (structure), lcsh:Physics
Abstract: The cross section of atomic electron Compton scattering $\gamma + e \rightarrow \gamma^\prime + e^\prime $ was measured in the 4.40--5.475 GeV photon beam energy region by the {\em PrimEx} collaboration at Jefferson Lab with an accuracy of 2\% and less. The results are consistent with theoretical predictions that include next-to-leading order radiative corrections. The measurements provide the first high precision test of this elementary QED process at beam energies greater than 0.1 GeV., Comment: 6 pages, 4 figures
Published: 2019

7. The CLAS12 Data Acquisition System

Author: K. Livingston, B. Moffit, W. Moore, B. Raydo, I. Mandjavidze, D. Heddle, S. Boyarinov, W. Gu, N. A. Baltzell, C. Timmer, A. Celentano, R. De Vita, D. Abbott, V. Gyurjyan, G. Heyes, H. Dong, C. Cuevas, B. McKinnon, C. Dickover, E. Jastrzembski, C. Smith, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay
Subjects: Physics, Nuclear and High Energy Physics, data acquisition, 010308 nuclear & particles physics, business.industry, Detector, programming, 01 natural sciences, computer: network, Software, Data acquisition, CLAS, Control system, 0103 physical sciences, electronics: readout, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], control system, 010306 general physics, business, Instrumentation, performance, activity report, Computer hardware, electronics: design
Abstract: International audience; The CLAS12 Data Acquisition System was designed and built as part of the CLAS12 detector project in Hall B at Jefferson Laboratory. This article contains a full description of the system, including requirements, design, hardware, and software descriptions, as well as the achieved performance. The associated computing, network, and slow controls systems are also described.
Published: 2020

8. Component based dataflow processing framework

Author: A. Bartle, S. Mancilla, R. Oyarzun, V. Gyurjyan, A. Vakhnin, and C. Lukashin
Subjects: Computer science, business.industry, computer.internet_protocol, Dataflow, Service-oriented architecture, computer.software_genre, Database-centric architecture, Data flow diagram, Computer architecture, Analytics, Component (UML), Operating system, business, computer
Abstract: In this paper we present SOA based CLAs12 event Reconstruction and Analyses (CLARA) framework used to develop Earth Science multi-sensor data fusion, processing, and analytics applications (NAIADS: NASA JLAB collaboration). CLARA design focus is on two main traits: a) real-time data stream processing, and b) service oriented architecture (SOA) in a flow based programming (FBP) paradigm. Data driven and data centric architecture of CLARA presents an environment for developing agile, elastic, multilingual data processing applications. The CLARA framework presents solutions, capable of processing large volumes of data interactively and substantially faster than batch systems.
Published: 2015

9. Anthropomorphic simulator for minimally invasive epicardial access procedures

Author: George T. Gillies, Srijoy Mahapatra, Jason M. Tucker-Schwartz, and Harutyun V. Gyurjyan
Subjects: Models, Anatomic, medicine.medical_specialty, business.industry, Intermediate point, Biomedical Engineering, Pericardial fluid, General Medicine, Pericardial space, Thoracic pressure, Ventricular tachycardia, medicine.disease, law.invention, medicine.anatomical_structure, Pressure measurement, law, Internal medicine, Cardiac procedures, Tachycardia, Ventricular, Cardiology, medicine, Humans, Minimally Invasive Surgical Procedures, Pericardium, business
Abstract: We have developed a prototype, in vitro anthropomorphic model for simulating pressure-guided, subxiphoid access procedures done to enable minimally invasive epicardial cardiac procedures including treatments for ventricular tachycardia. Life-size replicas of the heart and lungs were modelled using anatomically accurate surrogates. The dynamic pressure–frequency profiles of simulated pericardial fluid surrounding the water-pumped replica heart were measured and validated against previously acquired human intrapericardial pressure observations (Pearson's r = 0.88, p
Published: 2009

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

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

11. Exclusive ρ0 electroproduction on the proton at CLAS

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

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

Author: L. Elouadrhiri, R. A. Miskimen, M. Khandaker, B. McKinnon, G. Rosner, I. I. Strakovsky, R. W. Gothe, M. Bellis, D. Branford, P. Rossi, K. Y. Kim, A. Deur, S. V. Kuleshov, H. G. Juengst, K. S. Egiyan, P. V. Degtyarenko, P. Dragovitsch, M. Battaglieri, M. Nozar, D. J. Tedeschi, M. Taiuti, I. Bedlinskiy, L. Todor, J. P. Cummings, D. Doughty, F. X. Girod, S. Niccolai, D. Protopopescu, Laird Kramer, J. Hardie, V. Gyurjyan, R. De Masi, B. E. Stokes, F. Ronchetti, R. A. Schumacher, P. Corvisiero, V. P. Kubarovsky, G. S. Adams, D. Heddle, Brian Raue, M. Mirazita, G. Ricco, Dinko Pocanic, L. C. Smith, S. Tkachenko, R. Bradford, K. Lukashin, Y. G. Sharabian, O. Pogorelko, E. Wolin, S. McAleer, S. E. Kuhn, V. Sapunenko, B. S. Ishkhanov, Ji Li, Jean Laget, N. Benmouna, N. Pivnyuk, Rakhsha Nasseripour, B. Carnahan, L. C. Dennis, B. E. Bonner, M. Guillo, C. Tur, J. Napolitano, A. I. Ostrovidov, R. Fatemi, A. C S Lima, Gerard Gilfoyle, D. Cords, Marco A. Huertas, H. Avakian, E. S. Smith, K. Park, A. V. Vlassov, D. G. Ireland, M. R. Niroula, V. Batourine, B. Zhao, Y. Ilieva, E. L. Isupov, R. Suleiman, I. Hleiqawi, L. Guo, S. Bültmann, Volker D. Burkert, A. S. Biselli, H. S. Jo, E. Golovatch, Michael L. Williams, P. Bosted, S. L. Careccia, James Mueller, G. S. Mutchler, R. DeVita, M. Ripani, S. A. Morrow, Atilla Gonenc, M. MacCormick, C. Djalali, F. W. Hersman, T. A. Forest, M. Anghinolfi, P. D. Rubin, S. Stepanyan, A. Cazes, G. Gavalian, J. W. Price, S. Boiarinov, Maryam Moteabbed, B. M. Preedom, N. A. Baltzell, Sylvain Bouchigny, J. P. Ball, Y. Prok, K. L. Giovanetti, Michael Dugger, A. Yegneswaran, Shifeng Chen, K. V. Dharmawardane, J. Pierce, M. Kossov, Avraham Klein, Jens H. Kuhn, A. Stavinsky, Larry Weinstein, P. Ambrozewicz, E. Pasyuk, L. M. Qin, K. A. Griffioen, H. O. Funsten, P. Coltharp, U. Thoma, C. Keith, Lorenzo Zana, D. P. Weygand, S. A. Dytman, Hall Crannell, M. M. Ito, N. Baillie, J. T. Goetz, G. V. O'Rielly, C. Paterson, M. Klusman, K. Livingston, V. Crede, Z. W. Zhao, Frank Klein, D. G. Crabb, J. R. Calarco, S. Strauch, D. G. Jenkins, C. Salgado, J. D. Kellie, G. E. Dodge, S. Pozdniakov, N. Guler, J. W C McNabb, M. D. Mestayer, I. Niculescu, Nikolay Shvedunov, D. Lawrence, M. Guidal, D. I. Sober, S. S. Stepanyan, M. Osipenko, S. Barrow, F. Sabatié, Michael Vineyard, K. Beard, M. Garçon, B. Mecking, G. Riccardi, J. Shaw, C. Butuceanu, Michael Wood, W. K. Brooks, K. Hafidi, V. S. Serov, Victor Mokeev, M. Ungaro, K. Joo, J. Yun, J. P. Santoro, Roy Thompson, K. Kim, J. J. Manak, P. Eugenio, J. Zhang, H. Bagdasaryan, P. Collins, Daniel S. Carman, C. Hadjidakis, C. E. Hyde-Wright, M. Bektasoglu, J. Langheinrich, S. A. Philips, G. Niculescu, M. Holtrop, Hong Lu, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, B. B. Niczyporuk, J. Lachniet, A. Tkabladze, D. Rowntree, R. S. Hakobyan, J. Donnelly, O. P. Dzyubak, R. A. Niyazov, R. J. Feuerbach, L. Morand, P. Stoler, E. De Sanctis, K. Hicks, W. Kim, Susan Taylor, K. Mikhailov, H. Egiyan, N. Markov, Barry Ritchie, G. Asryan, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, G. V. Fedotov, and E. Polli
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Momentum transfer, Quark model, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Invariant mass, 010306 general physics, Nucleon, media_common
Abstract: We report results for the virtual photon asymmetry A{sub 1} on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ({sup 15}NH{sub 3}) and deuteron ({sup 15}ND{sub 3}) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for A{sub 1}(x,Q{sup 2}) and the related ratio g{sub 1}/F{sub 1}(x,Q{sup 2}) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q{sup 2} from 0.05 to 5.0 GeV{sup 2} and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q{sup 2}--dependence of A{sub 1}(x,Q{sup 2}) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A{sub 1}(x,Q{sup 2}) is not strictly Q{sup 2}--independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron whilemore » being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.« less
Published: 2006

13. The CLAS drift chamber system

Author: S. Dytman, Daniel S. Carman, G. Jacobs, S. Christo, S. E. Kuhn, R. Miskimen, M. Kossov, K.G. Vansyoc, J. W C McNabb, D. Tilles, C. Martin, W.S. Duncan, James Mueller, F. Roudot, R. A. Schumacher, R. A. Thompson, R. J. Feuerbach, G.R. Wilkin, Michael Vineyard, J. Yun, Avraham Klein, A. Yegneswaran, W. Tuzel, G. E. Dodge, F. Barbosa, B. B. Niczyporuk, V. Gyurjyan, R. W. Major, T. Dooling, M. D. Mestayer, B. A. Raue, B. Asavapibhop, R. Magahiz, Larry Weinstein, J.E. O'Meara, D. J. Tedeschi, P. Bonneau, C. E. Hyde-Wright, Friedrich Klein, R. S. Hicks, T McGuckin, J. Robb, K.H. Hicks, L. M. Qin, and Gerard Gilfoyle
Subjects: Physics, Nuclear and High Energy Physics, Toroid, Electromagnet, Spectrometer, business.industry, Superconducting magnet, Tracking (particle physics), Linear particle accelerator, Particle detector, law.invention, Nuclear physics, Optics, Planar, law, business, Instrumentation
Abstract: The CEBAF Large Acceptance Spectrometer at 12 GeV (CLAS12) is located in Hall B, one of the experimental halls at Jefferson Lab. The forward part of CLAS12 is built around a superconducting toroidal magnet. The six coils of the toroid divide the detector azimuthally into six sectors. Each sector contains three multi-layer drift chambers for reconstructing the trajectories of charged particles originating from a fixed target. Each of the 18 planar chambers has two “superlayers” of six layers each, with the wires in the two adjacent superlayers oriented at ± 6 ° stereo angles. Each layer has 112 hexagonal cells spanning a range from about 5 ° to 40 ° in polar angle. The six-layer structure provides redundancy in track segment finding and good tracking efficiency even in the presence of some individual wire inefficiency. The design, construction, operation, and calibration methods are described, and estimates of the efficiency and resolution are presented from in-beam measurements.
Published: 2000

14. Nuclear effects on R=σL/σT in deep-inelastic scattering

Author: K Ackerstaff, A Airapetian, N Akopov, I Akushevich, M Amarian, E.C Aschenauer, H Avakian, R Avakian, A Avetissian, B Bains, C Baumgarten, M Beckmann, S Belostotski, J.E Belz, Th Benisch, S Bernreuther, N Bianchi, J Blouw, H Böttcher, A Borissov, M Bouwhuis, J Brack, S Brauksiepe, B Braun, B Bray, St Brons, W Brückner, A Brüll, E.E.W Bruins, H.J Bulten, G.P Capitani, P Carter, P Chumney, E Cisbani, G.R Court, P.F Dalpiaz, E De Sanctis, D De Schepper, E Devitsin, P.K.A de Witt Huberts, P Di Nezza, M Düren, A Dvoredsky, G Elbakian, J Ely, A Fantoni, A Fechtchenko, M Ferstl, K Fiedler, B.W Filippone, H Fischer, B Fox, J Franz, S Frullani, M.-A Funk, Y Gärber, H Gao, F Garibaldi, G Gavrilov, P Geiger, V Gharibyan, A Golendukhin, G Graw, O Grebeniouk, P.W Green, L.G Greeniaus, C Grosshauser, M Guidal, A Gute, V Gyurjyan, J.P Haas, W Haeberli, J.-O Hansen, M Hartig, D Hasch, O Häusser, F.H Heinsius, R Henderson, M Henoch, R Hertenberger, Y Holler, R.J Holt, W Hoprich, H Ihssen, M Iodice, A Izotov, H.E Jackson, A Jgoun, R Kaiser, E Kinney, M Kirsch, A Kisselev, P Kitching, H Kobayashi, N Koch, K Königsmann, M Kolstein, H Kolster, V Korotkov, W Korsch, V Kozlov, L.H Kramer, V.G Krivokhijine, M Kurisuno, G Kyle, W Lachnit, P Lenisa, W Lorenzon, N.C.R Makins, F.K Martens, J.W Martin, F Masoli, A Mateos, M McAndrew, K McIlhany, R.D McKeown, F Meissner, F Menden, A Metz, N Meyners, O Mikloukho, C.A Miller, M.A Miller, R Milner, A Most, V Muccifora, R Mussa, A Nagaitsev, Yu Naryshkin, A.M Nathan, F Neunreither, J.M Niczyporuk, W.-D Nowak, M Nupieri, T.G O'Neill, R Openshaw, J Ouyang, B.R Owen, V Papavassiliou, S.F Pate, M Pitt, S Potashov, D.H Potterveld, G Rakness, A Reali, R Redwine, A.R Reolon, R Ristinen, K Rith, P Rossi, S Rudnitsky, M Ruh, D Ryckbosch, Y Sakemi, I Savin, C Scarlett, A Schäfer, F Schmidt, H Schmitt, G Schnell, K.P Schüler, A Schwind, J Seibert, T.-A Shibata, K Shibatani, T Shin, V Shutov, C Simani, A Simon, K Sinram, P Slavich, M Spengos, E Steffens, J Stenger, J Stewart, U Stoesslein, M Sutter, H Tallini, S Taroian, A Terkulov, E Thomas, B Tipton, M Tytgat, G.M Urciuoli, J.F.J van den Brand, G van der Steenhoven, R van de Vyver, J.J van Hunen, M.C Vetterli, V Vikhrov, M.G Vincter, J Visser, E Volk, W Wander, J Wendland, S.E Williamson, T Wise, K Woller, S Yoneyama, and H Zohrabian
Subjects: Physics, HERMES experiment, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Sigma, DESY, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Transverse plane, Cross section (physics), 0103 physical sciences, 010306 general physics, Scaling
Abstract: Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2 varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06 and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q^2.
Published: 2000

15. Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction

Author: K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, S. Barrow, C. Baumgarten, M. Beckmann, St. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, St. Brons, W. Brückner, A. Brüll, E. E. W. Bruins, H. J. Bulten, R. V. Cadman, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, P. P. J. Delheij, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. G. Guidal, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. S. Henderson, Th. Henkes, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, F. Kümmell, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, H. R. Poolman, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, H. Roloff, G. Röper, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, E. Thomas, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, J. J. van Hunen, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, M. C. Vetterli, V. Vikhrov, M. Vincter, J. Visser, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
Subjects: Physics, HERMES experiment, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, General Physics and Astronomy, Virtual particle, 01 natural sciences, Coherence length, Positron energy, Nuclear physics, Deuterium, Nuclear transparency, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium.
Published: 1999

16. Measurement of the neutron spin structure function g with a polarized 3He internal target

Author: K. Ackerstaff, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J.E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Brüll, E.E.W. Bruins, H.J. Bulten, G.P. Capitani, P. Carter, E. Cisbani, G.R. Court, P.P.J. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J.P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, R.S. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L.H. Kramer, B. Krause, V.G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N.C.R. Makins, S.I. Manaenkov, F.K. Martens, J.W. Martin, A. Mateos, K. McIlhany, R.D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R.G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A.M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T.G. O'Neill, R. Openshaw, V. Papavassiliou, S.F. Pate, M. Pitt, S. Potashov, D.H. Potterveld, B. Povh, G. Rakness, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K.P. Schüller, A. Schwind, T.-A. Shibata, T. Shin, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D.M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, M.C. Vetterli, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
Subjects: Physics, HERMES experiment, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Astrophysics::Cosmology and Extragalactic Astrophysics, HERA, Spin structure, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Positron, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, 010306 general physics, Spin-½
Abstract: Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g1n(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023
Published: 1997

17. Tensor Correlations Measured inHe3(e,e′pp)n

Author: D. Keller, M. Khandaker, B. McKinnon, G. Rosner, R. W. Gothe, V. Kuznetsov, A. Deur, N. Markov, W. K. Brooks, H. Hakobyan, J. M. Laget, M. Battaglieri, D. J. Tedeschi, I. Bedlinskiy, A. Kim, W. Kim, D. Doughty, P. Nadel-Turonski, R. P. Bennett, D. Protopopescu, Friedrich Klein, R. A. Schumacher, V. P. Kubarovsky, S. Pozdniakov, E. Voutier, E. Munevar, G. Niculescu, O. Pogorelko, S. E. Kuhn, R. Paremuzyan, C. E. Hyde, K. Joo, M. Ripani, Y. Ilieva, A. I. Ostrovidov, P. Khetarpal, S. Strauch, K. Park, Gerard Gilfoyle, G. Ricco, H. Avakian, W. Gohn, D. G. Ireland, B. Zhao, A. El Alaoui, C. S. Nepali, D. Sokhan, S. Bültmann, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, N. D. Kvaltine, H. Seraydaryan, P. Konczykowski, C. Djalali, I. J. D. MacGregor, S. Stepanyan, S. Procureur, J. W. Price, R. Dupre, S. Park, B. L. Berman, J. P. Ball, K. L. Giovanetti, D. S. Carman, R. De Vita, P. Rossi, Martin K. Mayer, Avraham Klein, B. Moreno, Larry Weinstein, W. J. Briscoe, E. Pasyuk, K. A. Griffioen, H. Moutarde, K. Livingston, V. Crede, S. Anefalos Pereira, S. Niccolai, R. Dickson, C. Salgado, G. E. Dodge, H. Y. Lu, E. De Sanctis, B. Morrison, W. Tang, M. Amarian, M. Aghasyan, I. Niculescu, D. I. Sober, S. Fegan, M. Osipenko, J. McAndrew, F. Sabatié, Michael Vineyard, C. Bookwalter, Michael Wood, N. Dashyan, H. Baghdasaryan, C. Hanretty, Victor Mokeev, M. Ungaro, S. Pisano, V. Gyurjyan, P. Eugenio, M. Taiuti, Z. W. Zhao, Sergey Kuleshov, S. S. Stepanyan, M. Guidal, M. Holtrop, A. Daniel, George Davey Smith, C. E. Taylor, A. D'Angelo, L. El Fassi, L. Guo, P. Stoler, B. Dey, K. Hicks, K. Mikhailov, D. P. Watts, H. Egiyan, M. Y. Gabrielyan, Kei Moriya, C. A. Meyer, K. P. Adhikari, and D. P. Weygand
Subjects: Physics, Nuclear reaction, Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Few-body systems, 01 natural sciences, Baryon, Nuclear physics, Momentum, Pair production, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We have measured the $^{3}\mathrm{He}(e,{e}^{\ensuremath{'}}pp)n$ reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated $pp$ and $pn$ nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of $pp$ to $pn$ pairs as a function of pair total momentum ${p}_{\mathrm{tot}}$. For pair relative momenta between 0.3 and $0.5\text{ }\text{ }\mathrm{GeV}/c$, the ratio is very small at low ${p}_{\mathrm{tot}}$ and rises to approximately 0.5 at large ${p}_{\mathrm{tot}}$. This shows the dominance of tensor over central correlations at this relative momentum.
Published: 2010

18. New Measurement of the π0 radiative decay width

Author: A. Kolarkar, M. Khandaker, A. V. Glamazdin, M. Gabrielyan, D. Kashy, R. A. Miskimen, G. Dzyubenko, I. Larin, M. A. Kubantsev, L. Jiang, T. E. Rodrigues, V. Vishnyakov, M. Payen, X. Li, A. Evdokimov, D. McNulty, G. Davidenko, W. A. Stephens, M. Konchatnyi, I. Nakagawa, S. Danagoulian, E. Pasyuk, J. He, S. Mtingwa, P. Ambrozewicz, L. Gan, A. Dolgolenko, J. Feng, S. Kowalski, P. Kingsberry, J. Underwood, R. C. Minehart, P. Collins, L. Benton, A. Deur, P. L. Cole, D. Lawrence, V. Gyurjyan, M. Wood, V. P. Kubarovsky, A. Ahmidouch, B. A. Mecking, Wolfgang Korsch, S. Gevorkyan, P. P. Martel, Aron M. Bernstein, Ashot Gasparian, V. Goryachev, M. M. Ito, V. V. Mochalov, A. Sitnikov, Y. Prok, Barry Ritchie, E. Clinton, D. S. Dale, V. Matveev, K. Baker, A. Teymurazyan, C. Salgado, S. Overby, Andrey Vasiliev, K. Hardy, Brian D. Milbrath, Rolf Ent, R.S. Pedroni, R. Demirchyan, A. Korchin, A. Shahinyan, A. Asratyan, S. Zhou, Volker D. Burkert, S. Stepanyan, and D. I. Sober
Subjects: Physics, Meson, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Carbon-12, General Physics and Astronomy, Particle Data Group, Elementary particle, 01 natural sciences, 7. Clean energy, Massless particle, Nuclear physics, Particle decay, Pion, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract: High precision measurements of the differential cross sections for $\pi^0$ photoproduction at forward angles for two nuclei, $^{12}$C and $^{208}$Pb, have been performed for incident photon energies of 4.9 - 5.5 GeV to extract the ${\pi^0 \to \gamma\gamma}$ decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The ${\pi^0 \to \gamma\gamma}$ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process. The resulting value for the decay width is $\Gamma{(\pi^0 \to \gamma\gamma)} = 7.82 \pm 0.14 ~({\rm stat.}) \pm 0.17 ~({\rm syst.}) ~{\rm eV}$. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current PDG average of this fundamental quantity and it is consistent with current theoretical predictions., Comment: 4 pages, 5 figures
Published: 2010

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

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

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

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

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

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

22. Electroproduction ofpπ+π−off protons at0.2<Q2<0.6GeV2and1.3<W<1.57GeV with the CLAS detector

Author: P. Stoler, N. A. Baltzell, V. Crede, K. Hicks, J. R. Calarco, K. A. Griffioen, K. S. Egiyan, J. D. Kellie, C. Paterson, H. Denizli, S. Strauch, M. Klusman, M. Guidal, J. W C McNabb, K. Livingston, Nikolay Shvedunov, G. S. Mutchler, R. Dickson, Shifeng Chen, M. Osipenko, M. Holtrop, G. E. Dodge, V. Gyurjyan, P. Eugenio, P. V. Degtyarenko, Laird Kramer, J. Donnelly, G. Asryan, C. E. Hyde, O. P. Dzyubak, M. Taiuti, Marco A. Huertas, G. Rosner, T. Mineeva, J. Zhang, N. Guler, F. X. Girod, J. Langheinrich, I. Niculescu, V. Batourine, B. Carnahan, R. A. Niyazov, E. De Sanctis, Hovhannes Baghdasaryan, Sylvain Bouchigny, L. C. Smith, J. T. Goetz, J. P. Cummings, D. Lawrence, A.V. Stavinsky, B. B. Niczyporuk, P. Corvisiero, L. Guo, P. Rossi, B. S. Ishkhanov, M. Ungaro, R. A. Miskimen, B. McKinnon, H. G. Juengst, Susan Taylor, E. Wolin, D. I. Sober, J. W. Price, Konstantin Stopani, D. J. Tedeschi, V. Sapunenko, N. Pivnyuk, K. Mikhailov, Y. Prok, D. Branford, Dinko Pocanic, M. Mirazita, H. Egiyan, E. Golovatch, William Brooks, J. M. Laget, L. Todor, S. E. Kuhn, R. Fatemi, J. P. Ball, I. Bedlinskiy, Sergey Kuleshov, Rakhsha Nasseripour, Hall Crannell, M. Bektasoglu, A. Yegneswaran, B. E. Stokes, D. Protopopescu, S. Pozdniakov, A. V. Vlassov, K. V. Dharmawardane, D. S. Carman, G. S. Adams, C. Tur, T. Lee, G. Ricco, K. Joo, J. Kuhn, D. G. Jenkins, A. I. Ostrovidov, Roy Thompson, G. V. O'Rielly, K. Park, R. De Vita, R. A. Schumacher, Elton Smith, R. J. Feuerbach, Victor Mokeev, J. Shaw, Y. Ilieva, S. A. Morrow, C. Djalali, G. Niculescu, M. Anghinolfi, Michael Wood, D. G. Ireland, D. G. Crabb, M. D. Mestayer, P. Coltharp, Friedrich Klein, James Mueller, N. Dashyan, S. Bültmann, T. A. Forest, Brian Raue, G. Gavalian, N. Hassall, M. Bellis, M. Guillo, S. Stepanyan, S. Niccolai, M. M. Ito, E. L. Isupov, Volker D. Burkert, J. Pierce, Avraham Klein, A. S. Biselli, P. D. Rubin, J. Hardie, J. Hu, P. Ambrozewicz, M. Battaglieri, V. S. Serov, L. C. Dennis, Michael L. Williams, B. E. Bonner, R. Bradford, B. A. Mecking, S. Tkachenko, N. Benmouna, F. Sabatié, Y. G. Sharabian, H. Avakian, Kwangsoo Kim, C. Butuceanu, M. Ripani, N. Markov, S. Boiarinov, D. Sharov, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, E. Pasyuk, S. A. Dytman, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, A. Tkabladze, G. V. Fedotov, Michael Vineyard, D. P. Weygand, Alexei V. Klimenko, V. P. Kubarovsky, Barry Ritchie, O. Pogorelko, Lorenzo Zana, J. P. Santoro, H. S. Jo, D. Doughty, C. Salgado, M. E. McCracken, P. Nadel-Turonski, Tsutomu Mibe, M. Khandaker, N. Gevorgyan, Z. Krahn, J. Lachniet, N. Baillie, Gerard Gilfoyle, D. Rowntree, M. J. Amaryan, R. W. Gothe, I. Hleiqawi, K. Y. Kim, S. L. Careccia, P. L. Cole, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and W. Kim
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Meson, Hadron, Elementary particle, Invariant mass, Sensitivity (control systems), Nucleon
Abstract: This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep{yields}e{sup '}p{pi}{sup +}{pi}{sup -}. The data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the as yet unexplored kinematic region of photon virtuality 0.2
Published: 2009

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

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

24. Nuclear Targets for a Precision Measurement of the Neutral Pion Radiative Width

Author: A. Kolarkar, V. Gyurjyan, D. Lawrence, S. Overby, P. L. Cole, M. Wood, R.S. Pedroni, I. Nakagawa, D. S. Dale, V. Matveev, O. Glamazdin, A. Sitnikov, Brian D. Milbrath, V. Goryachev, E. Clinton, K. Baker, A. Deur, A. Evdokimov, Sekazi K. Mtingwa, K. Hardy, G. Dzyubenko, I. Larin, Y. Prok, Barry Ritchie, Aron M. Bernstein, M. A. Kubantsev, P. P. Martel, P. Collins, L. Gan, W. A. Stephens, A. Teymurazyan, M. Khandaker, S. Danagoulian, G. Davidenko, J. Feng, D. McNulty, M. Gabrielyan, Ashot Gasparian, A. Dolgolenko, P. Ambrozewicz, J. Underwood, R. C. Minehart, S. Kowalski, M. Konchatnyi, Wolfgang Korsch, L. Benton, R. S. McWilliams, V. Vishnyakov, M. Payen, D. I. Sober, M. M. Ito, R. Demirchyan, C. Salgado, A. Asratyan, V. V. Mochalov, A. Ahmidouch, Andrey Vasiliev, O. Korchin, R. A. Miskimen, V. Verebryusov, E. Pasyuk, P. Kingsberry, and V. P. Kubarovsky
Subjects: Physics, Nuclear and High Energy Physics, Meson, Attenuation, FOS: Physical sciences, Particle accelerator, Radiation length, Linear particle accelerator, law.invention, Nuclear physics, Pion, law, Radiative transfer, Area density, Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment
Abstract: A technique is presented for precision measurements of the area densities, ρT , of approximately 5% radiation length carbon and 208 Pb targets used in an experiment at Jefferson Laboratory to measure the neutral pion radiative width. The precision obtained in the area density for the carbon target is ±0.050%, and that obtained for the lead target through an X-ray attenuation technique is ±0.43%.
Published: 2008

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

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

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

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

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

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

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

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

29. Measurement ofep→epπ0beam spin asymmetries above the resonance region

Author: R. De Masi, M. Garçon, B. Zhao, M. J. Amaryan, P. Ambrozewicz, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. Ball, J. P. Ball, N. A. Baltzell, V. Batourine, M. Battaglieri, I. Bedlinskiy, M. Bellis, N. Benmouna, B. L. Berman, P. Bertin, A. S. Biselli, L. Blaszczyk, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, L. Casey, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Crabb, V. Crede, N. Dashyan, E. De Sanctis, R. De Vita, P. V. Degtyarenko, A. Deur, K. V. Dharmawardane, R. Dickson, C. Djalali, G. E. Dodge, J. Donnelly, D. Doughty, M. Dugger, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, G. Feldman, A. Fradi, H. Funsten, G. Gavalian, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, A. Gonenc, R. W. Gothe, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, V. Gyurjyan, K. Hafidi, H. Hakobyan, C. Hanretty, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, T. Lee, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, M. Mazouz, B. McKinnon, B. A. Mecking, M. D. Mestayer, C. A. Meyer, T. Mibe, B. Michel, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, M. Nozar, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, F. Sabatié, J. Salamanca, C. Salgado, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. Stepanyan, S. S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, A. Tkabladze, S. Tkachenko, C. Tur, M. Ungaro, M. F. Vineyard, A. V. Vlassov, E. Voutier, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, and Z. W. Zhao
Subjects: Physics, Nuclear and High Energy Physics, Photon, Spectrometer, 010308 nuclear & particles physics, media_common.quotation_subject, Parton, 01 natural sciences, Asymmetry, Nuclear physics, Formalism (philosophy of mathematics), Amplitude, 0103 physical sciences, Cathode ray, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, media_common
Abstract: The beam spin asymmetry (BSA) in the exclusive reaction ep->ep pi0 was measured with the CEBAF 5.77 GeV polarized electron beam and Large Acceptance Spectrometer(CLAS). The xB, Q2, t and phi dependences of the pi0 BSA are presented in the deep inelastic regime. The asymmetries are fitted with a sin(phi) function and their amplitudes are extracted. Overall, they are of the order of 0.04 - 0.11 and roughly independent of t. This is the signature of a non-zero longitudinal-transverse interference. The implications concerning the applicability of a formalism based on generalized parton distributions, as well as the extension of a Regge formalism at high photon virtualities, are discussed.
Published: 2008

30. Light Vector Mesons in the Nuclear Medium

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

31. Bayesian analysis of pentaquark signals from CLAS data

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

32. Cross sections and beam asymmetries fore→p→enπ+in the nucleon resonance region for1.7⩽Q2⩽4.5GeV2

Author: R. Fatemi, A. V. Vlassov, T. Lee, H. G. Juengst, A. Fradi, R. De Vita, A.V. Stavinsky, N. Markov, N. Hassall, B. Zhao, D. J. Tedeschi, S. Park, Sylvain Bouchigny, K. Hafnaoui, K. Livingston, D. S. Dale, G. Rosner, R. Nasseripour, I. Bedlinskiy, S. Anefalos Pereira, P. Rossi, E. Wolin, R. Dickson, Ji Li, J. P. Ball, Y. Prok, F. W. Hersman, V. Kuznetsov, J. P. Cummings, V. Sapunenko, Dinko Pocanic, C. Hanretty, N. Guler, S. McAleer, F. X. Girod, L. Blaszczyk, D. G. Ireland, V. Crede, S. E. Kuhn, M. Osipenko, F. Sabatié, J. Lachniet, H. Denizli, A. Tkabladze, J. R. Johnstone, M. Kossov, J. R. Calarco, D. G. Crabb, D. Rowntree, J. Donnelly, G. Asryan, O. P. Dzyubak, R. A. Niyazov, A. I. Ostrovidov, A. C S Lima, R. Suleiman, I. Popa, G. S. Mutchler, L. Guo, G. E. Dodge, H. Y. Lu, M. Ungaro, D. Doughty, M. D. Mestayer, S. Niccolai, E. De Sanctis, Volker D. Burkert, A. S. Biselli, E. L. Isupov, C. Tur, M. Guillo, D. Heddle, W. Gohn, M. Guidal, J. Hardie, Z. Krahn, J. Kuhn, P. L. Cole, S. Barrow, Elton Smith, Friedrich Klein, M. Yurov, Kalvir S. Dhuga, Michael L. Williams, P. V. Degtyarenko, N. Baillie, M. Anghinolfi, James Mueller, A. V. Skabelin, L. Todor, D. Protopopescu, S. Mehrabyan, D. I. Sober, S. Pozdniakov, M. Garçon, J. Yun, D. Cords, S. S. Stepanyan, S. Boiarinov, P. D. Rubin, Y. G. Sharabian, A. Yegneswaran, R. A. Miskimen, Brian Raue, B. McKinnon, Atilla Gonenc, R. C. Minehart, Kei Moriya, C. A. Meyer, J. W. Price, T. Takeuchi, M. Holtrop, I. Niculescu, C. Bookwalter, G. V. Fedotov, W. Kim, G. Niculescu, G. Gavalian, Laird Kramer, G. Riccardi, D. Lawrence, Baile Zhang, Shifeng Chen, S. Dhamija, J. Shaw, P. Corvisiero, S. Tkachenko, L. El Fassi, D. Branford, Michael Wood, R. De Masi, B. E. Stokes, K. Hafidi, C. Butuceanu, D. Keller, D. Schott, G. S. Adams, N. A. Baltzell, V. Gyurjyan, N. Benmouna, M. Ripani, K. Joo, N. Dashyan, P. Mattione, D. P. Weygand, M. S. Saini, M. Mirazita, J. M. Laget, V. S. Serov, R. W. Gothe, Y. Ilieva, N. Gevorgyan, Michael Vineyard, J. Zhang, P. Nadel-Turonski, Alexei V. Klimenko, L. Cheng, Tsutomu Mibe, B. M. Preedom, L. Elouadrhiri, J. Langheinrich, K. Y. Kim, Nikolay Shvedunov, J. T. Goetz, E. Polli, H. Bagdasaryan, Lorenzo Zana, J. P. Santoro, Barry Ritchie, S. A. Philips, M. Khandaker, P. Eugenio, M. Taiuti, G. V. O'Rielly, Z. W. Zhao, I. I. Strakovsky, P. Stoler, J. D. Kellie, S. A. Morrow, V. P. Kubarovsky, V. Mokeev, R. A. Schumacher, B. Moreno, Gerard Gilfoyle, G. Ricco, C. Djalali, H. Hakobyan, H. S. Jo, Gerald Feldman, K. Hicks, O. Pogorelko, A. Deur, D. G. Jenkins, Federico Ronchetti, L. C. Dennis, L. Graham, P. Collins, B. E. Bonner, J. J. Melone, C. Salgado, D. Sokhan, K. Park, Daniel S. Carman, M. J. Amaryan, K. S. Egiyan, C. I O Gordon, N. Kalantarians, H. Avakian, W. K. Brooks, M. MacCormick, I. Hleiqawi, C. E. Hyde-Wright, D. Sharov, P. Ambrozewicz, K. Mikhailov, S. Bültmann, L. Morand, T. A. Forest, Cynthia Marie Hadjidakis, S. L. Careccia, Sergey Kuleshov, S. Stepanyan, K. L. Giovanetti, J. Pierce, Avraham Klein, Larry Weinstein, M. Bektasoglu, M. Nozar, Michael Dugger, H. O. Funsten, W. J. Briscoe, E. Pasyuk, S. A. Dytman, J. Salamanca, J. W C McNabb, L. Casey, B. B. Niczyporuk, N. Pivnyuk, V. Batourine, M. Battaglieri, L. C. Smith, E. Munevar, B. S. Ishkhanov, B. L. Berman, R. Bradford, B. A. Mecking, K. Lukashin, L. M. Qin, R. S. Hakobyan, K. A. Griffioen, C. Paterson, M. Klusman, D. P. Watts, M. R. Niroula, E. Golovatch, M. Bellis, S. Strauch, H. Egiyan, A. Cazes, Maryam Moteabbed, P. Coltharp, K. V. Dharmawardane, M. Y. Gabrielyan, R. J. Feuerbach, M. M. Ito, and Inna Aznauryan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Resonance, 01 natural sciences, Excited state, Isospin, 0103 physical sciences, Production (computer science), Invariant mass, Sensitivity (control systems), Atomic physics, 010306 general physics, Nucleon
Abstract: The exclusive electroproduction process $\stackrel{\ensuremath{\rightarrow}}{e}p\ensuremath{\rightarrow}{e}^{'}n{\ensuremath{\pi}}^{+}$ was measured in the range of the photon virtuality ${Q}^{2}=1.7\text{\ensuremath{-}}4.5 {\mathrm{GeV}}^{2}$, and the invariant mass range for the $n{\ensuremath{\pi}}^{+}$ system of $W=1.15\text{\ensuremath{-}}1.7 \mathrm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive ${\ensuremath{\pi}}^{+}$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n{\ensuremath{\pi}}^{+}$ center-of-mass system. The $n{\ensuremath{\pi}}^{+}$ channel has particular sensitivity to the isospin \textonehalf{} excited nucleon states, and together with the $p{\ensuremath{\pi}}^{0}$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the ${\ensuremath{\sigma}}_{{\mathit{LT}}^{'}}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
Published: 2008

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

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

34. Search for Medium Modifications of theρMeson

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

35. Erratum: Cross sections for theγp→K*0Σ+reaction atEγ=1.7−3.0GeV [Phys. Rev. C75, 042201 (2007)]

Author: Shifeng Chen, L. C. Dennis, M. Osipenko, H. Avakian, K. Livingston, K. Beard, K. A. Griffioen, J. Donnelly, G. Asryan, M. Battaglieri, R. Bradford, B. A. Mecking, O. P. Dzyubak, R. A. Niyazov, H. Egiyan, J. T. Goetz, R. Dickson, D. Doughty, G. Rosner, Carlos A. Salgado, J. W C McNabb, D. Heddle, A.V. Stavinsky, A. V. Vlassov, Maryam Moteabbed, W. J. Briscoe, E. Pasyuk, K. S. Egiyan, E. S. Smith, D. G. Jenkins, W. Kim, Laird Kramer, D. J. Tedeschi, Kwangsoo Kim, J. Lachniet, A. Tkabladze, S. A. Dytman, S. E. Kuhn, B. B. Niczyporuk, G. Riccardi, K. Mikhailov, B. L. Berman, M. Amarian, N. Guler, R. De Vita, I. Bedlinskiy, Andreas Klein, J. Langheinrich, B. E. Stokes, V. Sapunenko, C. Butuceanu, Sylvain Bouchigny, N. Pivnyuk, E. Wolin, Stephen Taylor, K. Lukashin, Ji Li, U. Thoma, C. Paterson, M. Bellis, P. Rossi, Gerard Gilfoyle, S. McAleer, F. X. Girod, S. A. Morrow, G. Gavalian, P. Stoler, R. S. Hakobyan, V. Batourine, S. Niccolai, C. Djalali, J. P. Ball, D. G. Ireland, M. D. Mestayer, V. Crede, G. Ricco, Y. Prok, V. Mokeev, D. S. Carman, J. Hardie, M. MacCormick, B. Carnahan, F. Sabatié, K. Hicks, J. R. Calarco, P. Ambrozewicz, Michael L. Williams, I. Hleiqawi, S. L. Careccia, V. P. Kubarovsky, S. Strauch, Atilla Gonenc, H. Juengst, D. G. Crabb, J. P. Cummings, G. S. Mutchler, M. Guidal, Z. Krahn, L. C. Smith, E. Munevar, N. A. Baltzell, E. De Sanctis, O. Pogorelko, K. L. Giovanetti, G. Niculescu, R. W. Gothe, N. Baillie, R. A. Miskimen, B. McKinnon, M. Anghinolfi, Larry Weinstein, B. S. Ishkhanov, S. Boiarinov, D. I. Sober, D. Branford, L. Elouadrhiri, M. R. Niroula, Yordanka Ilieva, M. Mirazita, J. M. Laget, M. Kossov, Frank Klein, I. I. Strakovsky, J. D. Kellie, A. Deur, R. G. Fersch, Rakhsha Nasseripour, M. Holtrop, Michael Dugger, B. Zhao, M. Khandaker, Brian Raue, P. Coltharp, Y. G. Sharabian, M. M. Ito, A. I. Ostrovidov, Michael Wood, K. Park, Michael Vineyard, Hong Lu, P. L. Cole, Z. W. Zhao, F. W. Hersman, S. Whisnant, B. M. Preedom, V. S. Serov, Federico Ronchetti, Lorenzo Zana, Volker D. Burkert, A. S. Biselli, Clarisse Tur, P. Nadel-Turonski, H. S. Jo, Tsutomu Mibe, Gerald Feldman, C. E. Hyde-Wright, R. C. Minehart, K. Wang, C. A. Meyer, K. Moriya, R. J. Feuerbach, Jens H. Kuhn, Sergey Kuleshov, S. Tkachenko, N. Benmouna, V. Gyurjyan, M. Ripani, G. V. Fedotov, N. Kalantarians, L. Todor, J. Zhang, H. Bagdasaryan, D. Protopopescu, J. W. Price, L. Guo, S. Pozdniakov, M. Garçon, M. Ungaro, K. Joo, S. S. Stepanyan, A. Yegneswaran, D. P. Weygand, Alexei V. Klimenko, Barry Ritchie, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, R. De Masi, R. A. Schumacher, M. Nozar, S. Bültmann, S. Stepanyan, J. Pierce, William Brooks, Hall Crannell, P. Eugenio, M. Taiuti, P. Collins, J. P. Santoro, and Roy Thompson
Subjects: Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Hadron, Elementary particle, Fermion, Boson, Sigma baryon
Published: 2007

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

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

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

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

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

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

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

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

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

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

41. First measurement of beam-recoil observablesCxandCzin hyperon photoproduction

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

42. Quark-hadron duality in spin structure functionsg1pandg1d

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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