Precise measurements of beam spin asymmetries in semi-inclusive π0 production
M. AghasyanINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyH. AvakianThomas Jefferson National Accelerator Facility, Newport News, VA 23606, United StatesP. RossiINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyE. De SanctisINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyD. HaschINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyM. MirazitaINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyD. AdikaramOld Dominion University, Norfolk, VA 23529, United StatesM. J. AmaryanOld Dominion University, Norfolk, VA 23529, United StatesM. AnghinolfiINFN, Sezione di Genova, 16146 Genova, ItalyH. BaghdasaryanOld Dominion University, Norfolk, VA 23529, United StatesJ. BallCEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, FranceM. BattaglieriINFN, Sezione di Genova, 16146 Genova, ItalyV. BatourineKyungpook National University, Daegu 702-701, Republic of KoreaI. BedlinskiyInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaR. BennettOld Dominion University, Norfolk, VA 23529, United StatesA. S. BiselliCarnegie Mellon University, Pittsburgh, PA 15213, United StatesD. BranfordEdinburgh University, Edinburgh EH9 3JZ, United KingdomW. J. BriscoeThe George Washington University, Washington, DC 20052, United StatesS. BültmannOld Dominion University, Norfolk, VA 23529, United StatesV. D. BurkertThomas Jefferson National Accelerator Facility, Newport News, VA 23606, United StatesD. S. CarmanThomas Jefferson National Accelerator Facility , Newport News , VA 23606 , United StatesS. ChandavarOhio University Lancaster, Lancaster, United StatesP. L. ColeIdaho State University , Pocatello , ID 83209 , United StatesP. CollinsCatholic University of America , Washington , DC 20064 , United StatesM. ContalbrigoINFN , Sezione di Ferrara , 44100 Ferrara , ItalyV. CredéFlorida State University , Tallahassee , FL 32306 , United StatesA. D’AngeloUniversity of Rome Tor Vergata, Rome, ItalyA. V. DanielOhio University Lancaster, Lancaster, United StatesN. DashyanAlikhanyan National Laboratory, Yerevan, ArmeniaR. De VitaThomas Jefferson National Accelerator Facility, Newport News, VA 23606, United StatesA. DeurThomas Jefferson National Accelerator Facility, Newport News, United StatesB. DeyCarnegie Mellon University, Pittsburgh, United StatesR. DicksonCarnegie Mellon University , Pittsburgh , PA 15213 , United StatesC. DjalaliUniversity of South Carolina , Columbia , SC 29208 , United StatesG. E. DodgeOld Dominion University, Norfolk, United StatesD. DoughtyThomas Jefferson National Accelerator Facility , Newport News , VA 23606 , United StatesR. DupréArgonne National Laboratory , Argonne , IL 60441 , United StatesH. EgiyanThomas Jefferson National Accelerator Facility, Newport News, United StatesA. El AlaouiArgonne National Laboratory , Argonne , IL 60441 , United StatesL. ElouadrhiriThomas Jefferson National Accelerator Facility, Newport News, United StatesP. EugenioFlorida State University , Tallahassee , FL 32306 , United StatesG. FedotovUniversity of South Carolina , Columbia , SC 29208 , United StatesS. FeganwA. FradiInstitut de Physique Nucléaire ORSAY , Orsay , FranceM. GabrielyanFlorida International University , Miami , FL 33199 , United StatesM. GarçonCurrent address: INFN , Sezione di Genova , 16146 Genova , ItalyN. GevorgyanAlikhanyan National Laboratory, Yerevan, ArmeniaG. P. GilfoyleUniversity of Richmond, Richmond, United StatesK. L. GiovanettiJames Madison University , Harrisonburg , VA 22807 , United StatesF. X. GirodThomas Jefferson National Accelerator Facility , Newport News , VA 23606 , United StatesJ. T. GoetzUniversity of California at Los Angeles , Los Angeles , CA 90095-1547 , United StatesW. GohnUniversity of Connecticut , Storrs , CT 06269 , United StatesE. GolovatchThomas Jefferson National Accelerator Facility, Newport News, VA 23606, United StatesR. W. GotheUniversity of South Carolina, Columbia, United StatesL. GrahamVirginia Polytechnic Institute and State University , Blacksburg , VA 24061-0435 , United StatesK. A. GriffioenWilliam & Mary, Williamsburg, United StatesB. GueganThomas Jefferson National Accelerator Facility, Newport News, VA 23606, United StatesM. GuidalOld Dominion University, Norfolk, VA 23529, United StatesN. GulerLos Alamos National Laboratory, Los Alamos, United StatesL. GuoThomas Jefferson National Accelerator Facility , Newport News , VA 23606 , United StatesK. HafidiArgonne National Laboratory , Argonne , IL 60441 , United StatesC. HanrettyUniversity of Virginia, Charlottesville, United StatesK. HicksOhio University , Athens , OH 45701 , United StatesM. HoltropUniversity of New Hampshire, Durham, United StatesC. E. Hyde-WrightOld Dominion University , Norfolk , VA 23529 , United StatesY. IlievaUniversity of South Carolina , Columbia , SC 29208 , United StatesD. G. IrelandUniversity of Glasgow, Glasgow, United KingdomE. L. IsupovCarnegie Mellon University, Pittsburgh, PA 15213, United StatesS. S. JawalkarIstituto Nazionale di Fisica Nucleare, Sezione di GenovaD. JenkinsVirginia Polytechnic Institute and State University , Blacksburg , VA 24061-0435 , United StatesH. S. JoInstitut de Physique Nucléaire ORSAY , Orsay , FranceK. JooUniversity of Connecticut , Storrs , CT 06269 , United StatesD. KellerOhio University , Athens , OH 45701 , United StatesM. KhandakerNorfolk State University , Norfolk , VA 23504 , United StatesP. KhetarpalCurrent address: INFN , Sezione di Genova , 16146 Genova , ItalyA. KimKyungpook National University , Daegu 702-701 , Republic of KoreaW. KimKyungpook National University , Daegu 702-701 , Republic of KoreaA. KleinOld Dominion University , Norfolk , VA 23529 , United StatesF. J. KleinCatholic University of America , Washington , DC 20064 , United StatesV. KubarovskyThomas Jefferson National Accelerator Facility, Newport News, United StatesS. E. KuhnOld Dominion University , Norfolk , VA 23529 , United StatesS. KuleshovUniversidad Técnica Federico Santa María , Casilla 110-V , Valparaíso , ChileV. KuznetsovKyungpook National University , Daegu 702-701 , Republic of KoreaN. D. KvaltineInstitute of Theoretical and Experimental Physics , Moscow 117259 , RussiaK. LivingstonUniversity of Glasgow, Glasgow, United KingdomH. Y. LuCarnegie Mellon University , Pittsburgh , PA 15213 , United StatesI. J. D. MacGregorUniversity of Glasgow, Glasgow, United KingdomN. MarkovUniversity of Connecticut , Storrs , CT 06269 , United StatesM. MayerOld Dominion University , Norfolk , VA 23529 , United StatesJ. McAndrewEdinburgh University , Edinburgh EH9 3JZ , United KingdomB. McKinnonUniversity of Glasgow, Glasgow, United KingdomC. A. MeyerCarnegie Mellon University , Pittsburgh , PA 15213 , United StatesA. MicherdzińskaThe George Washington University , Washington , DC 20052 , United StatesV. MokeevSkobeltsyn Nuclear Physics Institute , 119899 Moscow , RussiaB. MorenoCEA Paris-SaclayH. MoutardeOld Dominion UniversityE. MunévarGeorge Washington University, Washington, United StatesP. Nadel-TurońskiThomas Jefferson National Accelerator Facility , Newport News , VA 23606 , United StatesA. NiKyungpook National University , Daegu 702-701 , Republic of KoreaS. NiccolaiInstitut de Physique Nucléaire ORSAY , Orsay , France
2011en
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We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial sinϕh amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle ϕh of the produced neutral pion. The dependence of this amplitude on Bjorken x and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations.
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