APS » Journals » Phys. Rev. C » Volume 77 » Issue 1

Phys. Rev. C 77, 015208 (2008) [17 pages]

Cross sections and beam asymmetries for e⃗p→enπ⁺ in the nucleon resonance region for 1.7⩽Q²⩽4.5 GeV²

Abstract

References

Citing Articles (18)

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K. Park et al. CLAS Collaboration
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K. Park^1,2,*, V. D. Burkert², W. Kim¹, I. G. Aznauryan^2,42, R. Minehart⁴⁰, L. C. Smith⁴⁰, K. Joo^11,40, L. Elouadrhiri^2,10, G. Adams³³, M. J. Amaryan³¹, P. Ambrozewicz¹⁵, M. Anghinolfi²¹, G. Asryan⁴², H. Avakian^2,20, H. Bagdasaryan^31,42, N. Baillie⁴¹, J. P. Ball⁴, N. A. Baltzell³⁶, S. Barrow¹⁶, V. Batourine¹, M. Battaglieri²¹, I. Bedlinskiy²³, M. Bektasoglu³¹, M. Bellis⁷, N. Benmouna¹⁷, B. L. Berman¹⁷, A. S. Biselli^7,14,33, L. Blaszczyk¹⁶, B. E. Bonner³⁴, C. Bookwalter¹⁶, S. Bouchigny²², S. Boiarinov^2,23, R. Bradford⁷, D. Branford¹², W. J. Briscoe¹⁷, W. K. Brooks², S. Bültmann³¹, C. Butuceanu⁴¹, J. R. Calarco²⁸, S. L. Careccia³¹, D. S. Carman^2,30, L. Casey⁸, A. Cazes³⁶, S. Chen¹⁶, L. Cheng⁸, P. L. Cole^2,8,19, P. Collins⁴, P. Coltharp¹⁶, D. Cords², P. Corvisiero²¹, D. Crabb⁴⁰, V. Crede¹⁶, J. P. Cummings³³, D. Dale¹⁹, N. Dashyan⁴², R. De Masi^9,22, R. De Vita²¹, E. De Sanctis²⁰, P. V. Degtyarenko², H. Denizli³², L. Dennis¹⁶, A. Deur², S. Dhamija¹⁵, K. V. Dharmawardane³¹, K. S. Dhuga¹⁷, R. Dickson⁷, C. Djalali³⁶, G. E. Dodge³¹, J. Donnelly¹⁸, D. Doughty^2,10, M. Dugger⁴, S. Dytman³², O. P. Dzyubak³⁶, H. Egiyan^2,41,†, K. S. Egiyan⁴², L. El Fassi³, P. Eugenio^7,16, R. Fatemi⁴⁰, G. Fedotov²⁷, G. Feldman¹⁷, R. J. Feuerbach⁷, T. A. Forest^19,31, A. Fradi²², H. Funsten⁴¹, M. Y. Gabrielyan¹⁵, M. Garçon⁹, G. Gavalian^28,31, N. Gevorgyan⁴², G. P. Gilfoyle³⁵, K. L. Giovanetti²⁴, F. X. Girod^2,9, J. T. Goetz⁵, W. Gohn¹¹, E. Golovatch^21,‡, A. Gonenc¹⁵, C. I. O. Gordon¹⁸, R. W. Gothe³⁶, L. Graham³⁶, K. A. Griffioen⁴¹, M. Guidal²², M. Guillo³⁶, N. Guler³¹, L. Guo², V. Gyurjyan², C. Hadjidakis²², K. Hafidi³, K. Hafnaoui³, H. Hakobyan⁴², R. S. Hakobyan⁸, C. Hanretty¹⁶, J. Hardie^2,10, N. Hassall^§, D. Heddle², F. W. Hersman²⁸, K. Hicks³⁰, I. Hleiqawi³⁰, M. Holtrop²⁸, C. E. Hyde-Wright³¹, Y. Ilieva¹⁷, D. G. Ireland¹⁸, B. S. Ishkhanov²⁷, E. L. Isupov²⁷, M. M. Ito², D. Jenkins³⁹, H. S. Jo²², J. R. Johnstone¹⁸, H. G. Juengst^17,31, N. Kalantarians³¹, D. Keller³⁰, J. D. Kellie¹⁸, M. Khandaker²⁹, K. Y. Kim³², A. Klein³¹, F. J. Klein^8,15, A. V. Klimenko³¹, M. Klusman³³, M. Kossov²³, Z. Krahn⁷, L. H. Kramer^2,15, V. Kubarovsky³³, J. Kuhn^7,33, S. E. Kuhn³¹, S. V. Kuleshov²³, V. Kuznetsov¹, J. Lachniet^7,31, J. M. Laget^2,9, J. Langheinrich³⁶, D. Lawrence²⁶, T. Lee²⁸, Ji Li³³, A. C. S. Lima¹⁷, K. Livingston¹⁸, H. Y. Lu³⁶, K. Lukashin⁸, M. MacCormick²², N. Markov¹¹, P. Mattione³⁴, S. McAleer¹⁶, B. McKinnon¹⁸, J. W. C. McNabb⁷, B. A. Mecking², S. Mehrabyan³², J. J. Melone¹⁸, M. D. Mestayer², C. A. Meyer⁷, T. Mibe³⁰, K. Mikhailov²³, M. Mirazita²⁰, R. Miskimen²⁶, V. Mokeev^2,27, L. Morand⁹, B. Moreno²², K. Moriya⁷, S. A. Morrow^9,22, M. Moteabbed¹⁵, J. Mueller³², E. Munevar¹⁷, G. S. Mutchler³⁴, P. Nadel-Turonski¹⁷, R. Nasseripour^15,36, S. Niccolai^17,22, G. Niculescu^24,30, I. Niculescu^2,17,24, B. B. Niczyporuk², M. R. Niroula³¹, R. A. Niyazov^2,31, M. Nozar^2,**, G. V. O'Rielly¹⁷, M. Osipenko^21,27, A. I. Ostrovidov¹⁶, S. Park¹⁶, E. Pasyuk⁴, C. Paterson¹⁸, S. Anefalos Pereira²⁰, S. A. Philips¹⁷, J. Pierce⁴⁰, N. Pivnyuk²³, D. Pocanic⁴⁰, O. Pogorelko²³, E. Polli²⁰, I. Popa¹⁷, S. Pozdniakov²³, B. M. Preedom³⁶, J. W. Price⁶, Y. Prok^2,40,††, D. Protopopescu^18,28, L. M. Qin³¹, B. A. Raue^2,15, G. Riccardi¹⁶, G. Ricco²¹, M. Ripani²¹, B. G. Ritchie⁴, F. Ronchetti²⁰, G. Rosner¹⁸, P. Rossi²⁰, D. Rowntree²⁵, P. D. Rubin³⁵, F. Sabatié^9,31, M. S. Saini¹⁶, J. Salamanca¹⁹, C. Salgado²⁹, J. P. Santoro^2,8,39, V. Sapunenko^2,21, D. Schott¹⁵, R. A. Schumacher⁷, V. S. Serov²³, Y. G. Sharabian², D. Sharov²⁷, J. Shaw²⁶, N. V. Shvedunov²⁷, A. V. Skabelin²⁵, E. S. Smith², D. I. Sober⁸, D. Sokhan¹², A. Stavinsky²³, S. S. Stepanyan¹, S. Stepanyan², B. E. Stokes¹⁶, P. Stoler³³, I. I. Strakovsky¹⁷, S. Strauch^17,36, R. Suleiman²⁵, M. Taiuti²¹, T. Takeuchi¹⁶, D. J. Tedeschi^13,36, A. Tkabladze^17,30, S. Tkachenko³¹, L. Todor^7,35, C. Tur³⁶, M. Ungaro^11,33, M. F. Vineyard^35,38, A. V. Vlassov²³, D. P. Watts^18,‡‡, L. B. Weinstein³¹, D. P. Weygand², M. Williams⁷, E. Wolin², M. H. Wood^36,a, A. Yegneswaran², J. Yun³¹, M. Yurov¹, L. Zana²⁸, B. Zhang²⁵, J. Zhang³¹, B. Zhao¹¹, and Z. W. Zhao³⁶ (CLAS Collaboration)
¹Kyungpook National University, Daegu 702-701, Republic of Korea
²Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
³Argonne National Laboratory
⁴Arizona State University, Tempe, Arizona 85287-1504, USA
⁵University of California at Los Angeles, Los Angeles, California 90095-1547, USA
⁶California State University, Dominguez Hills, Carson, California 90747, USA
⁷Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁸Catholic University of America, Washington, D.C. 20064, USA
⁹CEA-Saclay, Service de Physique Nucléaire, F-91191 Gif-sur-Yvette, France
¹⁰Christopher Newport University, Newport News, Virginia 23606, USA
¹¹University of Connecticut, Storrs, Connecticut 06269, USA
¹²Edinburgh University, Edinburgh EH9 3JZ, United Kingdom
¹³Emmy-Noether Foundation, Germany
¹⁴Fairfield University, Fairfield, Connecticut 06824, USA
¹⁵Florida International University, Miami, Florida 33199, USA
¹⁶Florida State University, Tallahassee, Florida 32306, USA
¹⁷The George Washington University, Washington, D.C. 20052, USA
¹⁸University of Glasgow, Glasgow G12 8QQ, United Kingdom
¹⁹Idaho State University, Pocatello, Idaho 83209, USA
²⁰INFN, Laboratori Nazionali di Frascati, I-00044 Frascati, Italy
²¹INFN, Sezione di Genova, I-16146 Genova, Italy
²²Institut de Physique Nucleaire ORSAY, Orsay, France
²³Institute of Theoretical and Experimental Physics, Moscow, RU-117259, Russia
²⁴James Madison University, Harrisonburg, Virginia 22807, USA
²⁵Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
²⁶University of Massachusetts, Amherst, Massachusetts 01003, USA
²⁷Moscow State University, General Nuclear Physics Institute, RU-119899 Moscow, Russia
²⁸University of New Hampshire, Durham, New Hampshire 03824-3568, USA
²⁹Norfolk State University, Norfolk, Virginia 23504, USA
³⁰Ohio University, Athens, Ohio 45701, USA
³¹Old Dominion University, Norfolk, Virginia 23529, USA
³²University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
³³Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
³⁴Rice University, Houston, Texas 77005-1892, USA
³⁵University of Richmond, Richmond, Virginia 23173, USA
³⁶University of South Carolina, Columbia, South Carolina 29208, USA
³⁷TRIUMF, 4004, Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada
³⁸Union College, Schenectady, New York 12308, USA
³⁹Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
⁴⁰University of Virginia, Charlottesville, Virginia 22901, USA
⁴¹College of William and Mary, Williamsburg, Virginia 23187-8795, USA
⁴²Yerevan Physics Institute, 375036 Yerevan, Armenia

Received 5 September 2007; published 22 January 2008

The exclusive electroproduction process e⃗p→e^'nπ⁺ was measured in the range of the photon virtuality Q²=1.7-4.5 GeV², and the invariant mass range for the nπ⁺ system of W=1.15-1.7 GeV using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive π⁺ production from protons with nearly full coverage in the azimuthal and polar angles of the nπ⁺ center-of-mass system. The nπ⁺ channel has particular sensitivity to the isospin ½ excited nucleon states, and together with the pπ⁰ 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 σ_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.

URL:

http://link.aps.org/doi/10.1103/PhysRevC.77.015208

DOI:

10.1103/PhysRevC.77.015208

PACS:

21.10.Ky

^*Current address: University of South Carolina, Columbia, South Carolina 29208, USA.

^†Current address: University of New Hampshire, Durham, New Hampshire 03824-3568, USA.

^‡Current address: Moscow State University, General Nuclear Physics Institute, 119899 Moscow, Russia.

^§Current address: University of Glasgow, Glasgow G12 8QQ, United Kingdom.

^**Current address: TRIUMF, 4004, Wesbrook Mall, Vancouver, BC, V6T 2A3, Canada.

^††Current address: Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA.

^‡‡Current address: Edinburgh University, Edinburgh EH9 3JZ, United Kingdom.

^aCurrent address: University of Massachusetts, Amherst, Massachusetts 01003, USA.

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Phys. Rev. C 77, 015208 (2008) [17 pages]

Cross sections and beam asymmetries for e⃗p→enπ+ in the nucleon resonance region for 1.7⩽Q2⩽4.5 GeV2

Cross sections and beam asymmetries for e⃗p→enπ⁺ in the nucleon resonance region for 1.7⩽Q²⩽4.5 GeV²