Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

6533b831fe1ef96bd1299b7c

RESEARCH PRODUCT

Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton

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

subject

Particle physics Photon Proton General Physics and Astronomy FOS: Physical sciences 13.60.-r 13.60.Le 13.88.+e [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]01 natural sciences High Energy Physics - Experiment Nuclear physics High Energy Physics - Experiment (hep-ex)Pion 0103 physical sciences Phenomenological model [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment (nucl-ex)010306 general physics Nuclear Experiment Nuclear Experiment Physics 010308 nuclear & particles physics Bremsstrahlung Helicity 3. Good health Pair production Nucleon

description

Beam-helicity asymmetries for the two-pion-photoproduction reaction gamma + p --> p pi+ pi- have been studied for the first time in the resonance region for center-of-mass energies between 1.35 GeV and 2.30 GeV. The experiment was performed at Jefferson Lab with the CEBAF Large Acceptance Spectrometer using circularly polarized tagged photons incident on an unpolarized hydrogen target. Beam-helicity-dependent angular distributions of the final-state particles were measured. The large cross-section asymmetries exhibit strong sensitivity to the kinematics and dynamics of the reaction. The data are compared with the results of various phenomenological model calculations, and show that these models currently do not provide an adequate description for the behavior of this new observable.

year	journal	country	edition	language
2005-07-31

10.1103/physrevlett.95.162003 http://arxiv.org/abs/hep-ex/0508002