Author: "Sapunenko" / Topic: physics - Searchworks@Jio Institute Digital Library Search Results

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1. Enabling INFN–T1 to support heterogeneous computing architectures

Author: Dal Pra Stefano, Spiga Daniele, Boccali Tommaso, Chierici Andrea, Morganti Lucia, Sapunenko Vladimir, Cesini Daniele, Rinaldi Lorenzo, Gregori Daniele, and Cicala Marco
Subjects: Physics, QC1-999
Abstract: The INFN–CNAF Tier-1 located in Bologna (Italy) is a center of the WLCG e-Infrastructure providing computing power to the four major LHC collaborations and also supports the computing needs of about fifty more groups - also from non HEP research domains. The CNAF Tier1 center has been historically very active putting effort in the integration of computing resources, proposing and prototyping solutions both for extension through Cloud resources, public and private, and with remotely owned sites, as well as developing an integrated HTC+HPC system with the PRACE CINECA supercomputer center located 8Km far from the CNAF Tier-1 located in Bologna. In order to meet the requirements for the new Tecnopolo center, where the CNAF Tier-1 will be hosted, the resource integration activities keep progressing. In particular, this contribution will detail the challenges that have recently been addressed, providing opportunistic access to non standard CPU architectures, such as PowerPC and hardware accelerators (GPUs). We explain the approach adopted to both transparently provision x86_64, ppc64le and NVIDIA V100 GPUs from the Marconi 100 HPC cluster managed by CINECA and to access data from the Tier1 storage system at CNAF. The solution adopted is general enough to enable seamless integration of other computing architectures at the same time from different providers, such as ARM CPUs from the TEXTAROSSA project, and we report about the integration of these within the computing model of the CMS experiment. Finally we will discuss the results of the early experience.
Published: 2024
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2. Migrating the INFN-CNAF datacenter to the Bologna Tecnopolo: A status update

Author: Cesini Daniele, Cavalli Alessandro, Chierici Andrea, Ciaschini Vincenzo, Costantini Alessandro, Dal Pra Stefano, De Girolamo Donato, dell’Agnello Luca, Donatelli Massimo, Falabella Antonio, Fattibene Enrico, Giacomini Francesco, Martelli Barbara, Michelotto Diego, Morganti Lucia, Pellegrino Carmelo, Prosperini Andrea, Ricci Pier Paolo, Sapunenko Vladimir, Scarponi Luigi, Velardo Antonio, Zani Stefano, Boccali Tommaso, and Chiarelli Lorenzo
Subjects: Physics, QC1-999
Abstract: The INFN Tier1 data center is currently located in the premises of the Physics Department of the University of Bologna, where CNAF is also located. During 2023 it will be moved to the “Tecnopolo”, the new facility for research, innovation, and technological development in the same city area; the same location is also hosting Leonardo, the pre-exascale supercomputing machine managed by CINECA, co-financed as part of the EuroHPC Joint Undertaking, 4th ranked in the top500 November 2022 list. The construction of the new CNAF data center consists of two phases, corresponding to the computing requirements of LHC: Phase 1 involves an IT power of 3 MW, and Phase 2, starting from 2025, involves an IT power up to 10 MW. The new data center is designed to cope with the computing requirements of the data taking of the HL-LHC experiments, in the time spanning from 2026 to 2040 and will provide, at the same time, computing services for several other INFN experiments and projects, not only belonging to the HEP domain. The co-location with Leonardo opens wider possibilities to integrate HTC and HPC resources and the new CNAF data center will be tightly coupled with it, allowing access from a single entry point to resources located at CNAF and provided by the supercomputer. Data access from both infrastructures will be transparent to users. In this presentation we describe the new data center design, providing a status update on the migration, and we focus on the Leonardo integration showing the results of the preliminary tests to access it from the CNAF access points.
Published: 2024
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3. Recent evolutions in the LTDP CDF project

Author: Fornari Federico, Fattibene Enrico, Cavalli Alessandro, Cesini Daniele, Falabella Antonio, Morganti Lucia, Prosperini Andrea, and Sapunenko Vladimir
Subjects: Physics, QC1-999
Abstract: In the latest years, CNAF (the national center of the Italian Institute for Nuclear Physics INFN dedicated to Research and Development on Information and Communication Technologies) has been working on the Long Term Data Preservation (LTDP) project for the CDF experiment, active at Fermilab from 1990 to 2011. The main aims of the project are to protect the most relevant part of the CDF RUN-2 data collected between 2001 and 2011 and already stored on tape at CNAF (4 PB), as well as to ensure the availability and the access to the analysis facility to those data over time. Lately, the CDF database, hosting information about CDF datasets such as their structure, file locations and metadata, has been imported from Fermilab to CNAF. Also, the Sequential Access via Metadata (SAM) station data handling tool for CDF data management, that allows to manage data transfers and to retrieve information from the CDF database, has been properly installed and configured at CNAF. This was a fundamental step in the perspective of a complete decommissioning of CDF services on Fermilab side. An access system has been designed and tested to submit CDF analysis jobs, using CDF software distributed via CERN Virtual Machine File System (CVMFS) and requesting delivery of CDF files stored on CNAF tapes, as well as data present only on Fermilab storage archive. Moreover, the availability and the correctness of all CDF data stored on CNAF tapes has been verified. This paper describes all these recent evolutions in detail, presenting the future plans for the LTDP project at CNAF.
Published: 2020
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4. HSM and backup services at INFN-CNAF

Author: Cavalli Alessandro, Cesini Daniele, Fattibene Enrico, Prosperini Andrea, and Sapunenko Vladimir
Subjects: Physics, QC1-999
Abstract: IBM Spectrum Protect (ISP) software, one of the leader solutions in data protection, contributes to the data management infrastructure operated at CNAF, the central computing and storage facility of INFN (Istituto Nazionale di Fisica Nucleare – Italian National Institute for Nuclear Physics). It is used to manage about 55 Petabytes of scientific data produced by LHC (Large Hadron Collider at CERN) and other experiments in which INFN is involved, stored on tape resources as the highest latency storage tier within HSM (Hierarchical Space Management) environment. To accomplish this task, ISP works together with IBM Spectrum Scale (formerly GPFS - General Parallel File System) and GEMSS (Grid Enabled Mass Storage System), an in-house developed software layer that manages migration and recall queues. Moreover, we perform backup/archive operation of main IT services running at CNAF, such as mail servers, configurations, repositories, documents, logs, etc. In this paper we present the current configuration of the HSM infrastructure and the backup and recovery service, with particular attention to issues related to the increasing amount of scientific data to manage, expected for the next years.
Published: 2019
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5. INFN Tier–1: a distributed site

Author: dell’Agnello Luca, Boccali Tommaso, Cesini Daniele, Chiarelli Lorenzo, Chierici Andrea, Dal Pra Stefano, De Girolamo Donato, Falabella Antonio, Fattibene Enrico, Maron Gaetano, Michelotto Diego, Morganti Lucia, Prosperini Andrea, Sapunenko Vladimir, and Zani Stefano
Subjects: Physics, QC1-999
Abstract: The INFN Tier-1 center at CNAF has been extended in 2016 and 2017 in order to include a small amount of resources (∼ 22 kHS06 corresponding to ∼ 10% of the CNAF pledges for LHC in 2017) physically located at the Bari-ReCas site (∼ 600 km distant from CNAF). In 2018, a significant fraction of the CPU power (∼ 170 kHS06, equivalent to ∼ 50% of the total CNAF pledges) is going to be provided via a collaboration with the PRACE Tier-0 CINECA center (a few km from CNAF), thus building a truly geographically distributed (WAN) center. The two sites are going to be interconnected via an high bandwidth link (400-1200 Gb/s), in order to ensure a transparent access to data residing on CNAF storage; the latency between the centers is small enough not to require particular caching strategies. In this contribution we describe the issues and the results of the production configuration, focusing both on the management aspects and on the performance provided to end-users.
Published: 2019
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6. Recent evolutions in the LTDP CDF project

Author: Federico Fornari, Lucia Morganti, V. Sapunenko, Enrico Fattibene, Daniele Cesini, Antonio Falabella, A. Cavalli, and A Prosperini
Subjects: File system, Database, 010308 nuclear & particles physics, business.industry, Group method of data handling, Data management, Physics, QC1-999, computer.software_genre, 01 natural sciences, Sequential access, Metadata, Software, Virtual machine, 0103 physical sciences, Fermilab, 010306 general physics, business, computer
Abstract: In the latest years, CNAF (the national center of the Italian Institute for Nuclear Physics INFN dedicated to Research and Development on Information and Communication Technologies) has been working on the Long Term Data Preservation (LTDP) project for the CDF experiment, active at Fermilab from 1990 to 2011. The main aims of the project are to protect the most relevant part of the CDF RUN-2 data collected between 2001 and 2011 and already stored on tape at CNAF (4 PB), as well as to ensure the availability and the access to the analysis facility to those data over time. Lately, the CDF database, hosting information about CDF datasets such as their structure, file locations and metadata, has been imported from Fermilab to CNAF. Also, the Sequential Access via Metadata (SAM) station data handling tool for CDF data management, that allows to manage data transfers and to retrieve information from the CDF database, has been properly installed and configured at CNAF. This was a fundamental step in the perspective of a complete decommissioning of CDF services on Fermilab side. An access system has been designed and tested to submit CDF analysis jobs, using CDF software distributed via CERN Virtual Machine File System (CVMFS) and requesting delivery of CDF files stored on CNAF tapes, as well as data present only on Fermilab storage archive. Moreover, the availability and the correctness of all CDF data stored on CNAF tapes has been verified. This paper describes all these recent evolutions in detail, presenting the future plans for the LTDP project at CNAF.
Published: 2020

7. HSM and backup services at INFN-CNAF

Author: A. Cavalli, Enrico Fattibene, V. Sapunenko, Daniele Cesini, and A Prosperini
Subjects: File system, Large Hadron Collider, 010308 nuclear & particles physics, business.industry, Data management, Physics, QC1-999, Petabyte, computer.software_genre, 01 natural sciences, Software, Backup, Server, 0103 physical sciences, Operating system, IBM, 010306 general physics, business, computer
Abstract: IBM Spectrum Protect (ISP) software, one of the leader solutions in data protection, contributes to the data management infrastructure operated at CNAF, the central computing and storage facility of INFN (Istituto Nazionale di Fisica Nucleare – Italian National Institute for Nuclear Physics). It is used to manage about 55 Petabytes of scientific data produced by LHC (Large Hadron Collider at CERN) and other experiments in which INFN is involved, stored on tape resources as the highest latency storage tier within HSM (Hierarchical Space Management) environment. To accomplish this task, ISP works together with IBM Spectrum Scale (formerly GPFS - General Parallel File System) and GEMSS (Grid Enabled Mass Storage System), an in-house developed software layer that manages migration and recall queues. Moreover, we perform backup/archive operation of main IT services running at CNAF, such as mail servers, configurations, repositories, documents, logs, etc. In this paper we present the current configuration of the HSM infrastructure and the backup and recovery service, with particular attention to issues related to the increasing amount of scientific data to manage, expected for the next years.
Published: 2019

8. INFN Tier–1: a distributed site

Author: Gaetano Maron, Antonio Falabella, A Prosperini, L Chiarelli, V. Sapunenko, Lucia Morganti, Tommaso Boccali, Andrea Chierici, Enrico Fattibene, S Zani, Donato De Girolamo, L. dell'Agnello, Diego Michelotto, Daniele Cesini, and Stefano Dal Pra
Subjects: Large Hadron Collider, 010308 nuclear & particles physics, Physics, QC1-999, 0103 physical sciences, Operating system, High bandwidth, 010306 general physics, computer.software_genre, 01 natural sciences, computer, Tier 1 network
Abstract: The INFN Tier-1 center at CNAF has been extended in 2016 and 2017 in order to include a small amount of resources (∼ 22 kHS06 corresponding to ∼ 10% of the CNAF pledges for LHC in 2017) physically located at the Bari-ReCas site (∼ 600 km distant from CNAF). In 2018, a significant fraction of the CPU power (∼ 170 kHS06, equivalent to ∼ 50% of the total CNAF pledges) is going to be provided via a collaboration with the PRACE Tier-0 CINECA center (a few km from CNAF), thus building a truly geographically distributed (WAN) center. The two sites are going to be interconnected via an high bandwidth link (400-1200 Gb/s), in order to ensure a transparent access to data residing on CNAF storage; the latency between the centers is small enough not to require particular caching strategies. In this contribution we describe the issues and the results of the production configuration, focusing both on the management aspects and on the performance provided to end-users.
Published: 2019

9. 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

10. 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

11. 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

12. The CLAS Electromagnetic Calorimeter at Large Angles

Author: Paolo Rossi, H. Avakian, Marco Ripani, V. Sapunenko, Victor Mokeev, R. De Vita, P. Corvisiero, M. Battaglieri, E. Polli, M. Mirazita, M. Taiuti, F. Ronchetti, V. Muccifora, V. Gyuriyan, M. Anghinolfi, N. Bianchi, M. Osipenko, E. Golovach, and Giovanni Ricco
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Monte Carlo method, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Scintillator, Calorimeter, Nuclear physics, Electromagnetic calorimeter, Calibration, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment, Energy (signal processing)
Abstract: The study of the response of the two modules of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to charged and neutral particles is reported. The results agree very well with the Monte Carlo simulation. The procedures adopted for the energy and timing calibration are also discussed, proving that the module geometry allows for simple self-calibrating energy and timing algorithms.
Published: 2014

13. Phenomenological model for describing pion-pair production on a proton by virtual photons in the energy region of nucleon-resonance excitation

Author: M. Anginolfi, M. Ripani, B. S. Ishkhanov, G. Ricco, E. N. Golovach, M. Taiuti, V. V. Sapunenko, M. Battaglieri, M. Osipenko, G. V. Fedotov, and Victor Mokeev
Subjects: Physics, Nuclear and High Energy Physics, Proton, Nuclear Theory, Virtual particle, Atomic and Molecular Physics, and Optics, Nuclear physics, Cross section (physics), Pion, Pair production, Phenomenological model, Nuclear Experiment, Nucleon, Energy (signal processing)
Abstract: A phenomenological model is developed for describing the production of π + π − pairs on a proton by virtual photons in the energy region of nucleon-resonance excitation.The cross sections are calculated for the channels γp → π −Δ++, γp → π +Δ0, and γp → ρp, which make a dominant contribution to pion-pair production, and the results are compared with available experimental data.The contributions of nucleon resonances to the cross section for the reaction γp → π −Δ++ are predicted within the developed approach.
Published: 2001

14. Theep→e′pηReaction at and above theS11(1535)Baryon Resonance

Author: M. J. Amaryan, M. Taiuti, S. K. Matthews, J. Ficenec, Gyurjyan, W. Kim, A. Longhi, R. A. Schumacher, B. E. Bonner, L. Elouadrhiri, A. P. Freyberger, R. Magahiz, Robert E. Welsh, S. Dytman, S. Whisnant, B. M. Preedom, Federico Ronchetti, R. J. Feuerbach, K. L. Giovanetti, B. Asavapibhop, Michael Dugger, Shalev Gilad, De Sanctis E, A. V. Vlassov, G. Ricco, J. R. Kane, H. Avakian, Philip L. Cole, J. P. Cummings, G. S. Adams, Larry Weinstein, R. A. Miskimen, K. Joo, J. Shaw, R. W. Major, Moshe Gai, M. Kossov, W. J. Briscoe, D. Rowntree, D. Doughty, K. Beard, W. K. Brooks, Friedrich Klein, R. S. Hicks, Brian Raue, Kevin Fissum, Kalvir S. Dhuga, Barry Ritchie, A. Coleman, K. A. Griffioen, M. M. Ito, G. Riccardi, L. M. Qin, J. J. Manak, M. Mirazita, J. M. Laget, C. E. Hyde-Wright, J. W C McNabb, M. S. Ohandjanyan, D. Heddle, C. Salgado, H. R. Weller, Roy Thompson, Curtis Smith, D. P. Weygand, Herbert O. Funsten, S. A. Philips, Patrick Girard, Y. Kuang, H. Egiyan, M. Witkowski, Bernhard Mecking, Mestayer, A. J. Sarty, Jing Zhao, S. Stepanyan, De Vita R, D. G. Jenkins, C. Djalali, Z. L. Zhou, M. Lucas, Airton Deppman, D. I. Sober, A. Shafi, D. Hancock, Avraham Klein, Leskin Ga, M. Battaglieri, S. McAleer, William Bertozzi, E. Polli, E. Anciant, L. Farhi, G. E. Dodge, Daniel S. Carman, V. B. Gavrilov, O. Pogorelko, A. K. Opper, G. Audit, J. W. Price, M. Khandaker, E. Wolin, P. V. Degtyarenko, Y. Patois, Gerard Gilfoyle, Dinko Pocanic, L.C. Dennis, K. Loukachine, N. Pivnyuk, M. Bektasoglu, S. E. Kuhn, S. M. Shuvalov, D. Lawrence, M. Eckhause, J. Napolitano, M. Ripani, M. Guillo, Jochen Heisenberg, Y. V. Efremenko, Volker D. Burkert, M. Sanzone, J. Connelly, Donal Day, M. Sargsyan, G. A. Peterson, M. Guidal, A. V. Skabelin, J. Yun, D. Cords, A. Yegneswaran, A. S. Biselli, Elton Smith, S. Barrow, M. Holtrop, Thomas E. Smith, G. S. Mutchler, M. Anghinolfi, Hall Crannell, D. G. Crabb, James Mueller, S. Taylor, P. D. Rubin, G. Capitani, F. Roudot, D. J. Tedeschi, Y. G. Sharabian, M. Spraker, Sapunenko, R. C. Minehart, M. Klusman, Nicola Bianchi, S. Boiarinov, C. A. Meyer, J. S. McCarthy, B. Carnahan, Thierry Auger, A. R. Reolon, Michael Vineyard, C. Marchand, P. Rossi, P. Dragovitsch, F. W. Hersman, R. A. Demirchyan, T. Y. Tung, J. Hardie, K. Y. Kim, Muccifora, R. A. Niyazov, John T. O'Brien, P. Corvisiero, K. S. Egiyan, Calarco, P. Stoler, and K. Hicks
Subjects: Baryon, Physics, Nuclear physics, Particle physics, Photon, Amplitude, Angular distribution, Meson, Momentum transfer, General Physics and Astronomy, Resonance, Invariant (physics), Nuclear Experiment
Abstract: New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
Published: 2001

15. Electron Scattering From High-Momentum Neutrons in Deuterium

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

16. Measurement of high lying nucleon resonances and search for a missing state in double charged pion electroproduction off the proton

Author: Giovanni Ricco, V. Sapunenko, M. Osipenko, Nikolay Shvedunov, A. A. Boluchevskii, Marco Ripani, G. V. Fedotov, B. S. Ishkhanov, V. Mokeev, M. Anghinolfi, R. De Vita, E. N. Golovach, M. Battaglieri, M. Taiuti, and Volker D. Burkert
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Proton, Nuclear Theory, Hadron, Resonance, Elementary particle, Atomic and Molecular Physics, and Optics, Baryon, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract: We have analyzed data taken by the CLAS collaboration in double charged pion electroproduction off the proton. We have used an isobar model specifically developed for the analysis of the Nππ channel. This approach relates baryon resonance parameters to the experimental cross section, allowing the extraction of electromagnetic and some strong couplings from the fit to the data. A remarkable feature of the CLAS data is a resonance structure around 1.7 GeV which has not been seen in double pion photoproduction. The structure appears at all Q 2 values from 0.5 to 1.5 GeV 2 and it can not be reproduced with conventional N ∗ parameters.
Published: 2003

17. Evidence for a backward peak in the gamma d -> pi(0)d cross section near the eta threshold

Author: Ilieva, Y., Berman, B. L., Kudryavtsev, A. E., Strakovsky, I. I., Tarasov, V. E., Amarian, M., Ambrozewicz, P., Anghinolfi, M., Asryan, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J. P., Baltzell, N. A., Batourine, V., Battaglieri, M., Bedlinskiy, I., Bellis, M., Benmouna, N., Biselli, A. S., Bouchigny, S., Boiarinov, S., Bradford, R., Branford, D., Briscoe, W. J., Brooks, W. K., Bültmann, S., Burkert, V. D., Butuceanu, C., Calarco, J. R., Careccia, S. L., Carman, D. S., Chen, S., Cole, P. L., Collins, P., Coltharp, P., Crabb, D., Crede, V., De Masi, R., De Sanctis, E., De Vita, R., Degtyarenko, P. V., Deur, A., Dickson, R., Djalali, C., Dodge, G. E., Donnelly, J., Doughty, D., Dugger, M., Dzyubak, O. P., Egiyan, H., Egiyan, K. S., Elouadrhiri, L., Eugenio, P., Fedotov, G., Feldman, G., Funsten, H., Garçon, M., Gavalian, G., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Goetz, J. T., Gonenc, A., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Gyurjyan, V., Hafidi, K., Hakobyan, R. S., Hersman, F. W., Hicks, K., Hleiqawi, I., Holtrop, M., Hyde Wright, C. E., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Ito, M. M., Jenkins, D., H. S., Jo, Joo, K., Juengst, H. G., Kalantarians, N., Kellie, J. D., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Kossov, M., Krahn, Z., Kramer, L. H., Kubarovsky, V., Kuhn, J., Kuhn, S. E., Kuleshov, S. V., Lachniet, J., Laget, J. M., Langheinrich, J., Lawrence, D., Livingston, K., Lu, H., Maccormick, M., Markov, N., Mckinnon, B., Mecking, B. A., Mestayer, M. D., Meyer, C. A., Mibe, T., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Moriya, K., Morrow, S. A., Moteabbed, M., Munevar, E., Mutchler, G. S., Nadel Turonski, P., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B. B., Niroula, M. R., Niyazov, R. A., Nozar, M., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Paterson, C., Pierce, J., Pivnyuk, N., Pogorelko, O., Pozdniakov, S., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ricco, Giovanni, Ripani, M., Ritchie, B. G., Ronchetti, F., Rosner, G., Rossi, P., Sabatié, F., Salgado, C., Santoro, J. P., Sapunenko, V., Schumacher, R. A., Serov, V. S., Sharabian, Y. G., Shvedunov, N. V., Smith, E. S., Smith, L. C., Sober, D. I., Stavinsky, A., Stepanyan, S. S., Stepanyan, S., Stokes, B. E., Stoler, P., Strauch, S., Taiuti, MAURO GINO, Tedeschi, D. J., Thoma, U., Tkabladze, A., Tkachenko, S., Tur, C., Ungaro, M., Vineyard, M. F., Vlassov, A. V., Watts, D. P., Weinstein, L. B., Weygand, D. P., Williams, M., Wolin, E., Wood, M. H., Yegneswaran, A., Zana, L., Zhang, J., Zhao, B., and Zhao, Z.
Subjects: Nuclear and High Energy Physics, D ELASTIC-SCATTERING, COHERENT PION-PHOTOPRODUCTION, D ELASTIC-SCATTERING, DIBARYON RESONANCES, NEAR-THRESHOLD, MESIC NUCLEUS, BOUND-STATES, DEUTERON, MESON, SIGNATURE, REGION, DIBARYON RESONANCES, Nuclear Theory, MESIC NUCLEUS, COHERENT PION-PHOTOPRODUCTION, Resonance (particle physics), BOUND-STATES, REGION, Nuclear physics, Pion, Intermediate state, NEAR-THRESHOLD, Nuclear Experiment, Physics, Range (particle radiation), Eta meson, SIGNATURE, DEUTERON, Amplitude, High Energy Physics::Experiment, MESON, Nucleon, Excitation
Abstract: High-quality cross sections for the reaction gamma+d->pi^0+d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E_gamma=700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535)S_11 resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta meson dominates., Comment: slightly modified title, additional paragraph and a table (Table 2) added on p. 5; to be submitted to EPJA, 6 pages, 3 figures
Published: 2010

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

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

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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. 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

36. 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

37. 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

38. 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

39. 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

40. 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

41. 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

42. ISOBAR CHANNELS IN THE PRODUCTION OF PI+ PI- PAIRS ON A PROTON BY VIRTUAL PHOTONS

Author: G. V. Fedotov, Marco Ripani, J. Ricco, E. L. Isupov, V. V. Sapunenko, M. Battaglieri, B. S. Ishkhanov, E. N. Golovach, N. Markov, M. Taiuti, A. A. Boluchevskii, L. Elouardrhiri, Nikolay Shvedunov, V. I. Mokeev, Volker D. Burkert, and K. Joo
Subjects: Physics, NUCLEON-RESONANCE EXCITATION, Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, Hadron, Virtual particle, ELECTROPRODUCTION, Resonance (particle physics), Atomic and Molecular Physics, and Optics, Nuclear physics, Pair production, Pion, Isobar, Nuclear Experiment, Nucleon, ENERGY REGION, NUCLEON-RESONANCE EXCITATION, ENERGY REGION, ELECTROPRODUCTION
Abstract: A new approach is developed for evaluating contributions of various isobar channels to the double charged-pion production in the reactions γr,vp → π+π−p. This approach makes it possible to determine both respective cross sections and amplitudes for quasi-two-particle channels from a fit to data on cross sections for a three-particle final state. The diffractive anzatz, which is widely used to describe rho-meson production, is modified to meet the purpose of the description of data in the near-threshold and subthreshold regions. The cross sections for rho-meson electroproduction in the energy region of nucleon-resonance excitation are determined for the first time on the basis of the latest data of the CLAS Collaboration.
Published: 2007

43. 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

44. 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

45. 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

46. 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

47. 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

48. 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

49. Erratum:η′Photoproduction on the Proton for Photon Energies from 1.527 to 2.227 GeV [Phys. Rev. Lett.96, 062001 (2006)]

Author: Laird Kramer, Dinko Pocanic, G. S. Mutchler, S. E. Kuhn, G. Rosner, Stephen Taylor, Yordanka Ilieva, M. D. Mestayer, J. J. Manak, P. Eugenio, M. Osipenko, Shifeng Chen, M. Taiuti, S. Boiarinov, B. M. Preedom, M. Guidal, G. Niculescu, K. Beard, K. Livingston, K. S. Egiyan, M. Holtrop, R. A. Schumacher, Lorenzo Zana, Frank Klein, K. Mikhailov, M. Guillo, J. T. Goetz, J. Langheinrich, S. A. Philips, K. A. Griffioen, V. Batourine, D. G. Ireland, V. Crede, S. A. Morrow, P. Rubin, L. Elouadrhiri, A.V. Stavinsky, H. S. Jo, Gerald Feldman, J. R. Calarco, N. Guler, G. Gavalian, C. Djalali, G. Audit, C. E. Hyde-Wright, R. J. Feuerbach, M. Bektasoglu, J. Shaw, N. A. Baltzell, I. I. Strakovsky, B. Carnahan, F. Sabatié, K. Wang, B. E. Stokes, G. S. Adams, D. J. Tedeschi, V. Mokeev, J. P. Cummings, J. Hu, E. Wolin, P. Ambrozewicz, Michael Wood, A. Deur, J. Donnelly, G. Asryan, S. Barrow, O. P. Dzyubak, R. A. Niyazov, H. Juengst, V. S. Serov, R. A. Miskimen, B. McKinnon, I. Bedlinskiy, M. Anghinolfi, G. V. O'Rielly, J. P. Ball, Y. Prok, M. Kossov, Andreas Klein, K. V. Dharmawardane, M. Nozar, P. Corvisiero, James Mueller, Rakhsha Nasseripour, K. S. Dhuga, D. Branford, J. P. Santoro, M. Bellis, E. S. Smith, Marco A. Huertas, D. S. Carman, A. Coleman, H. R. Weller, Roy Thompson, D. Protopopescu, T. A. Forest, D. G. Jenkins, J. D. Kellie, Y. G. Sharabian, Cynthia Marie Hadjidakis, E. De Sanctis, M. Mirazita, J. M. Laget, M. Battaglieri, P. Collins, M. Spraker, V. Gyurjyan, A. I. Ostrovidov, P. Stoler, A. C S Lima, K. Park, L. C. Smith, S. Pozdniakov, M. Garçon, B. S. Ishkhanov, P. L. Cole, Michael Vineyard, A. Shafi, Mark Richard James Williams, S. Stepanyan, Sylvain Bouchigny, R. Bradford, B. A. Mecking, P. Rossi, R. DeVita, J. Zhang, V. P. Kubarovsky, D. G. Crabb, Michael Dugger, Volker D. Burkert, H. Egiyan, J. Pierce, J. W C McNabb, K. Hicks, W. Kim, Clarisse Tur, P. Nadel-Turonski, H. Bagdasaryan, J. W. Price, V. Sapunenko, Valeria Muccifora, A. Empl, O. Pogorelko, A. S. Biselli, P. Dragovitsch, D. I. Sober, S. McAleer, F. X. Girod, Tsutomu Mibe, B. L. Berman, H. O. Funsten, S. Niccolai, L. M. Qin, Gerard Gilfoyle, B. B. Niczyporuk, William Brooks, U. Thoma, L. C. Dennis, B. E. Bonner, P. Coltharp, N. Pivnyuk, K. Lukashin, J. Napolitano, Hall Crannell, H. Avakian, M. M. Ito, J. Hardie, S. Strauch, Jens H. Kuhn, C. Paterson, Nicola Bianchi, L. C. Maximon, C. Marchand, M. Klusman, J. Lachniet, A. Tkabladze, L. Guo, M. Ungaro, G. E. Dodge, D. Rowntree, P. V. Degtyarenko, K. Kim, S. Bültmann, W. J. Briscoe, E. Pasyuk, K. Joo, J. Yun, D. Cords, S. S. Stepanyan, N. Baillie, S. A. Dytman, R. S. Hakobyan, R. Fatemi, A. Yegneswaran, D. Lawrence, A. V. Vlassov, Kwangsoo Kim, G. Riccardi, C. Butuceanu, S. Tkachenko, N. Benmouna, T. Lee, M. Ripani, Carlos A. Salgado, G. Ricco, Brian Raue, Federico Ronchetti, R. C. Minehart, C. A. Meyer, G. V. Fedotov, D. P. Weygand, D. Doughty, H. Denizli, D. Heddle, A. V. Skabelin, Alexei V. Klimenko, Barry Ritchie, E. Anciant, M. Khandaker, I. Hleiqawi, S. L. Careccia, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, F. W. Hersman, and R. W. Gothe
Subjects: Physics, Nuclear physics, Meson production, Photon, Proton, General Physics and Astronomy
Published: 2006

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

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

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