Exclusive ρ0 electroproduction on the proton at CLAS

Morrow, S.A.; De Masi, R.; Guidal, M.; Bouchigny, S.; Didelez, J.P.; Fradi, A.; Hadjidakis, C.; Hourany, E.; Jo, H.S.; MacCormick, M.; Moreno, B.; Niccolai, S.; Garcon, M.; Audit, G.; Marchand, C.; Morand, L.; Procureur, S.; Sabatie, F.; Laget, J.M.; Smith, E.S.; Avakian, H.; Burkert, V.D.; Carman, D.S.; Cords, D.; Degtyarenko, P.V.; Deur, A.; Elouadrhiri, L.; Guo, L.; Gyurjyan, V.; Ito, M.M.; Kubarovsky, V.; Mecking, B.A.; Mestayer, M.D.; Niczyporuk, B.B.; Nozar, M.; Sapunenko, V.; Sharabian, Y.G.; Stepanyan, S.; Weygand, D.P.; Wolin, E.; Yegneswaran, A.; Adams, G.; Cummings, J.P.; Khetarpal, P.; Li, Ji; Stoler, P.; Adhikari, K.P.; Amaryan, M.J.; Bueltmann, S.; Careccia, S.L.; Dharmawardane, K.V.; Dodge, G.E.; Guler, N.; Hyde-Wright, C.E.; Juengst, H.G.; Kalantarians, N.; Klein, A.; Klimenko, A.V.; Kuhn, S.E.; Niroula, M.R.; Qin, L.M.; Tkachenko, S.; Weinstein, L.B.; Zhang, J.; Aghasyan, M.; De Sanctis, E.; Mirazita, M.; Anefalos Pereira, S.; Polli, E.; Rossi, P.; Anghinolfi, M.; Battaglieri, M.; Corvisiero, P.; De Vita, R.; Ricco, G.; Ripani, M.; Taiuti, M.; Asryan, G.; Dashyan, N.; Egiyan, K.S.; Gevorgyan, N.; Hakobyan, H.; Bagdasaryan, H.; Baillie, N.; Butuceanu, C.; Fersch, R.; Griffioen, K.A.; Ball, J.P.; Collins, P.; Dugger, M.; Pasyuk, E.; Ritchie, B.G.; Baltzell, N.A.; Cazes, A.; Djalali, C.; Dzyubak, O.P.; Gothe, R.W.; Graham, L.; Guillo, M.; Langheinrich, J.; Lu, H.Y.; Preedom, B.M.; Tedeschi, D.J.; Tur, C.; Wood, M.H.; Zhao, Z.W.; Barrow, S.; Blaszczyk, L.; Bookwalter, C.; Chen, S.; Coltharp, P.; Crede, V.; Dennis, L.; Eugenio, P.; Hanretty, C.; McAleer, S.; Ostrovidov, A.I.; Park, S.; Riccardi, G.; Saini, M.S.; Stokes, B.E.; Bedlinskiy, I.; Kossov, M.; Mikhailov, K.; Pivnyuk, N.; Pogorelko, O.; Pozdniakov, S.; Serov, V.S.; Stavinsky, A.; Vlassov, A.V.; Bektasoglu, M.; Bellis, M.; Bradford, R.; Dickson, R.; Feuerbach, R.J.; McCracken, M.; McNabb, J.W.C.; Meyer, C.A.; Moriya, K.; Schumacher, R.A.; Williams, M.; Benmouna, N.; Berman, B.L.; Briscoe, W.J.; Dhuga, K.S.; Ilieva, Y.; Munevar, E.; Nadel-Turonski, P.; O'Rielly, G.V.; Philips, S.A.; Popa, I.; Strakovsky, I.I.; Biselli, A.S.; Bonner, B.E.; Mattione, P.; Mutchler, G.S.; Boiarinov, S.; Branford, D.; Sokhan, D.; Brooks, W.K.; Calarco, J.R.; Hersman, F.W.; Holtrop, M.; Carnahan, B.; Casey, L.; Cheng, L.; Crannell, H.; Klein, F.J.; Santoro, J.P.; Sober, D.I.; Zana, L.; Cole, P.L.; Crabb, D.; Fatemi, R.; Minehart, R.; Pierce, J.; Pocanic, D.; Smith, L.C.; Dale, D.; Forest, T.A.; Salamanca, J.; Denizli, H.; Dytman, S.; Mehrabyan, S.; Mueller, J.; Dhamija, S.; Moteabbed, M.; Schott, D.; Doughty, D.; Egiyan, H.; El Fassi, L.; Hafidi, K.; Fedotov, G.; Ishkhanov, B.S.; Isupov, E.L.; Sharov, D.; Shvedunov, N.V.; Gavalian, G.; Gilfoyle, G.P.; Rubin, P.D.; Giovanetti, K.L.; Girod, F.X.; Goetz, J.T.; Gohn, W.; Markov, N.; Zhao, B.; Gordon, C.I.O.; Hassall, N.; Ireland, D.G.; Johnstone, J.R.; Kellie, J.D.; Livingston, K.; McKinnon, B.; Melone, J.J.; Paterson, C.; Rosner, G.; Hardie, J.; Heddle, D.; Hicks, K.; Hleiqawi, I.; Keller, D.; Mibe, T.; Jenkins, D.; and others; CLAS Collaboration

doi:10.1140/epja/i2008-10683-5

Published January 2009 | Version v1

Journal article Metadata-only

Exclusive ρ0 electroproduction on the proton at CLAS

1. Service de Physique Nucleaire, CEA-Saclay, Gif-sur-Yvette (France)
2. Institut de Physique Nucleaire, Orsay (France)
3. Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
4. Rensselaer Polytechnic Institute, Troy, NY (United States)
5. Old Dominion University, Norfolk, VA (United States)
6. Laboratori Nazionali di Frascati, INFN, Frascati (Italy)
7. Sezione di Genova, INFN, Genova (Italy)
8. Yerevan Physics Institute, Yerevan (Armenia)
9. College of William and Mary, Williamsburg, VA (United States)
10. Arizona State University, Tempe, AZ (United States)
11. University of South Carolina, Columbia, SC (United States)
12. Florida State University, Tallahassee, FL (United States)
13. Institute of Theoretical and Experimental Physics, Moscow (Russian Federation)
14. Ohio University, Athens, OH (United States)
15. Carnegie Mellon University, Pittsburgh, PA (United States)
16. The George Washington University, Washington, DC (United States)
17. Fairfield University, Fairfield, CT (United States)
18. Rice University, Houston, TX (United States)
19. Edinburgh University, Edinburgh (United Kingdom)
20. Universidad Tecnica Federico Santa Maria, Casilla, Valparaiso (Chile)
21. University of New Hampshire, Durham, NH (United States)
22. Catholic University of America, Washington, DC (United States)
23. Idaho State University, Pocatello, ID (United States)
24. University of Virginia, Charlottesville, VA (United States)
25. University of Pittsburgh, Pittsburgh, PA (United States)
26. Florida International University, Miami, FL (United States)
27. Christopher Newport University, Newport News, VA (United States)
28. Argonne National Laboratory, Argonne, IL (United States)
29. General Nuclear Physics Institute, Moscow State University, Moscow (Russian Federation)
30. University of Richmond, Richmond, VA (United States)
31. James Madison University, Harrisonburg, VA (US)
32. Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
33. Service de Physique Nucleaire, CEA-Saclay, Gif-sur-Yvette (FR)
34. University of California at Los Angeles, Los Angeles, CA (US)
35. University of Connecticut, Storrs, CT (US)
36. University of Glasgow, Glasgow (GB)
37. Christopher Newport University, Newport News, VA (US)
38. Ohio University, Athens, OH (US)
39. Virginia Polytechnic Institute and State University, Blacksburg, VA (US)

The ep→e'pρ0 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, Q2 and t dependences of the cross-section are compared to theoretical calculations based on the 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 ∼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. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epja/i2008-10683-5

Additional details

DOI: 10.1140/epja/i2008-10683-5;

Journal Title: European Physical Journal. A
Journal Volume: 39
Journal Issue: 1
Journal Page Range: p. 5-31
ISSN: 1434-6001

Country of Publication: Germany
Country of Input or Organization: Germany
INIS RN: 40035335
Subject category: S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator: Numerical Data
Descriptors DEI: ANGULAR DISTRIBUTION; DENSITY MATRIX; DIFFERENTIAL CROSS SECTIONS; ELECTRON-PROTON INTERACTIONS; ELECTRONS; ELECTROPRODUCTION; EXCITATION FUNCTIONS; EXCLUSIVE INTERACTIONS; EXPERIMENTAL DATA; GEV RANGE 01-10; INTEGRAL CROSS SECTIONS; MATRIX ELEMENTS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; POLARIZED PRODUCTS; PROTONS; RHO-770 MESONS; SPIN ORIENTATION
Descriptors DEC: BARYONS; BASIC INTERACTIONS; BOSONS; CROSS SECTIONS; DATA; DIFFERENTIAL CROSS SECTIONS; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELECTRON-NUCLEON INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FUNCTIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTONS; MATRICES; MESONS; NUCLEONS; NUMERICAL DATA; ORIENTATION; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; VECTOR MESONS

Collaborations: CLAS Collaboration

Exclusive ρ0 electroproduction on the proton at CLAS

Availability note (English)

Additional details

Identifiers

Publishing Information

INIS

Optional Information

Exclusive ρ0 electroproduction on the proton at CLAS

Creators

Description

Availability note (English)

Additional details

Identifiers

Publishing Information

INIS

Optional Information