Beam-Helicity Asymmetries in Double-Charged-Pion Photoproduction on the Proton
S. StrauchThe George Washington University, Washington, District of Columbia 20052, USAB. L. BermanThe George Washington University, Washington, District of Columbia 20052, USAG. S. AdamsRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAP. AmbrozewiczFlorida International University, Miami, Florida 33199, USAM. AnghinolfiSezione di Genova, INFN, 16146 Genova, ItalyB. AsavapibhopUniversity of Massachusetts, Amherst, Massachusetts 01003, USAG. AsryanYerevan Physics Institute, 375036 Yerevan, ArmeniaG. AuditService de Physique Nucléaire, CEA-Saclay, F91191 Gif-sur-Yvette,Cedex, FranceH. AvakianLaboratori Nazionali di Frascati, INFN, Frascati, ItalyH. BagdasaryanOld Dominion University, Norfolk, Virginia 23529, USAN. BaillieCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAJ. BallArizona State University, Tempe, Arizona 85287-1504, USAN. A. BaltzellUniversity of South Carolina, Columbia, South Carolina 29208, USAS. BarrowFlorida State University, Tallahassee, Florida 32306, USAV. BatourineKyungpook National University, Daegu 702-701, South KoreaM. BattaglieriSezione di Genova, INFN, 16146 Genova, ItalyK. BeardJames Madison University, Harrisonburg, Virginia 22807, USAI. BedlinskiyInstitute of Theoretical and Experimental Physics, Moscow, 117259, RussiaM. BektasogluOhio University, Athens, Ohio 45701, USAM. BellisCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAN. BenmounaThe George Washington University, Washington, District of Columbia 20052, USAC. BennholdThe George Washington University, Washington, District of Columbia 20052, USAA. S. BiselliCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAS. BoiarinovInstitute of Theoretical and Experimental Physics, Moscow, 117259, RussiaS. BouchignyInstitut de Physique Nucleaire ORSAY, Orsay, FranceR. BradfordCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAD. BranfordEdinburgh University, Edinburgh EH9 3JZ, United KingdomW. J. BriscoeThe George Washington University, Washington, District of Columbia 20052, USAWK BrooksThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAS. BültmannOld Dominion University, Norfolk, Virginia 23529, USAVolker BurkertThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAC. ButuceanuCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAJ. R. CalarcoUniversity of New Hampshire, Durham, New Hampshire 03824-3568, USAS. L. CarecciaOld Dominion University, Norfolk, Virginia 23529, USAD. S. CarmanOhio University, Athens, Ohio 45701, USAB. CarnahanCatholic University of America, Washington, District of Columbia 20064, USAS. ChenFlorida State University, Tallahassee, Florida 32306, USAP. L. ColeIdaho State University, Pocatello, Idaho 83209, USAAlan ColemanCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAP. ColtharpFlorida State University, Tallahassee, Florida 32306, USAD. CordsThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAP. CorvisieroSezione di Genova, INFN, 16146 Genova, ItalyDonald G. CrabbUniversity of Virginia, Charlottesville, Virginia 22901, USAH. CrannellCatholic University of America, Washington, District of Columbia 20064, USAJ. P. CummingsRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAP. V. DegtyarenkoThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAH. DenizliUniversity of Pittsburgh, Pittsburgh, Pennsylvania 15260, USAL. DennisFlorida State University, Tallahassee, Florida 32306, USAE. De SanctisLaboratori Nazionali di Frascati, INFN, Frascati, ItalyA. DeurThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAR. DeVitaSezione di Genova, INFN, 16146 Genova, ItalyK. V. DharmawardaneOld Dominion University, Norfolk, Virginia 23529, USAKS DhugaThe George Washington University, Washington, District of Columbia 20052, USAC. DjalaliUniversity of South Carolina, Columbia, South Carolina 29208, USAG. E. DodgeOld Dominion University, Norfolk, Virginia 23529, USAJ. DonnellyUniversity of Glasgow, Glasgow G12 8QQ, United KingdomD. DoughtyChristopher Newport University, Newport News, Virginia 23606, USAP. DragovitschFlorida State University, Tallahassee, Florida 32306, USAM. DuggerArizona State University, Tempe, Arizona 85287-1504, USAS. DytmanUniversity of Pittsburgh, Pittsburgh, Pennsylvania 15260, USAO. P. DzyubakUniversity of South Carolina, Columbia, South Carolina 29208, USAH. EgiyanCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAK. S. EgiyanYerevan Physics Institute, 375036 Yerevan, ArmeniaL. ElouadrhiriChristopher Newport University, Newport News, Virginia 23606, USAA. EmplRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAP. EugenioFlorida State University, Tallahassee, Florida 32306, USAR. FatemiUniversity of Virginia, Charlottesville, Virginia 22901, USAG. FedotovSkobeltsyn Nuclear Physics Institute, Moscow State University, 119899 Moscow, RussiaG. FeldmanThe George Washington University, Washington, District of Columbia 20052, USAR. J. FeuerbachCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAA. FixInstitut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, GermanyT. A. ForestOld Dominion University, Norfolk, Virginia 23529, USAH. O. FunstenCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAG. GavalianOld Dominion University, Norfolk, Virginia 23529, USAG. P. GilfoyleUniversity of Richmond, Richmond, Virginia 23173, USAK. L. GiovanettiJames Madison University, Harrisonburg, Virginia 22807, USAF. X. GirodService de Physique Nucléaire, CEA-Saclay, F91191 Gif-sur-Yvette,Cedex, FranceJ. T. GoetzUniversity of California at Los Angeles, Los Angeles, California 90095-1547, USAR. W. GotheUniversity of South Carolina, Columbia, South Carolina 29208, USAK. A. GriffioenCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAM. GuidalInstitut de Physique Nucleaire ORSAY, Orsay, FranceN. GulerOld Dominion University, Norfolk, Virginia 23529, USAL. GuoThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAV. GyurjyanThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAC. HadjidakisInstitut de Physique Nucleaire ORSAY, Orsay, FranceR. S. HakobyanCatholic University of America, Washington, District of Columbia 20064, USAJ. HardieChristopher Newport University, Newport News, Virginia 23606, USAD. HeddleChristopher Newport University, Newport News, Virginia 23606, USAF. W. HersmanUniversity of New Hampshire, Durham, New Hampshire 03824-3568, USAK. HicksOhio University, Athens, Ohio 45701, USAI. HleiqawiOhio University, Athens, Ohio 45701, USAM. HoltropUniversity of New Hampshire, Durham, New Hampshire 03824-3568, USAJ. F. HuRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAM. HuertasUniversity of South Carolina, Columbia, South Carolina 29208, USAC. E. Hyde-WrightOld Dominion University, Norfolk, Virginia 23529, USAY. IlievaThe George Washington University, Washington, District of Columbia 20052, USAD. G. IrelandUniversity of Glasgow, Glasgow G12 8QQ, United KingdomB. S. IshkhanovSkobeltsyn Nuclear Physics Institute, Moscow State University, 119899 Moscow, RussiaM. M. ItoThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAD. JenkinsVirginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0435, USA
2005en
ABI
Аннотация
Beam-helicity asymmetries for the two-pion-photoproduction reaction gammap-->ppi(+)pi(-) have been studied for the first time in the resonance region for center-of-mass energies between 1.35 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.
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