Measurement of the Proton Form Factor by Studying e⁺e⁻ → pp̅

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dc.contributor.ORCID0000-0003-0867-2189 (Lou, X)en_US
dc.contributor.authorAblikim, M.en_US
dc.contributor.authorAchasov, M. N.en_US
dc.contributor.authorAi, X. C.en_US
dc.contributor.authorAlbayrak, O.en_US
dc.contributor.authorAlbrecht, M.en_US
dc.contributor.authorAmbrose, D. J.en_US
dc.contributor.authorAmoroso, A.en_US
dc.contributor.authorLou, Xinchouen_US
dc.contributor.authorBESIII Collaborationen_US
dc.contributor.utdAuthorLou, Xinchouen_US
dc.date.accessioned2016-11-23T21:04:31Z
dc.date.available2016-11-23T21:04:31Z
dc.date.created2015-06-09en_US
dc.date.issued2015-06-09en_US
dc.description.abstractUsing data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e⁺e⁻ → pp̅ at 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic form factor of the proton is deduced under the assumption that the electric and magnetic form factors are equal |G(E)| = |G(M)|. In addition, the ratio of electric to magnetic form factors, |G(E)/G(M)|, and |G(M)| are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at √s̅ = 2232.4 and 2400.0 MeV and a combined sample at √s̅ = 3050.0, 3060.0 and 3080.0 MeV, respectively. The measured cross sections are in agreement with recent results from BABAR, improving the overall uncertainty by about 30%. |G(E)/G(M)| ratios are close to unity and consistent with BABAR results in the same q^2 region, which indicates the data are consistent with the assumption that |G(E)| = |G(M)| within uncertainties.en_US
dc.description.sponsorshipThis work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts Nos. 10935007, 11121092, 11125525, 11235011, 11322544, 11335008, 11375170, 11275189, 11078030, 11475164, 11005109, 11475169, 11425524; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts Nos. 11079008, 11179007, U1232201, U1332201; CAS under Contracts Nos. KJCX2-YW-N29, KJCX2-YW-N45; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Ministry of Development of Turkey under Contract No. DPT2006K-120470; Russian Foundation for Basic Research under Contract No. 14-07-91152; U. S. Department of Energy under Contracts Nos. DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.en_US
dc.identifier.bibliographicCitationAblikim, M., M. N. Achasov, X. C. Ai, O. Albayrak, et al. 2015. "Measurement of the proton form factor by studying e⁺e⁻ → pp̅." Physical Review D 91(11), doi: 10.1103/PhysRevD.91.112004en_US
dc.identifier.issn1550-7998en_US
dc.identifier.issue11en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/5124
dc.identifier.volume91en_US
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.urihttp://dx.doi.org/10.1103/PhysRevD.91.112004
dc.rights©2015 American Physical Societyen_US
dc.sourcePhysical Review D
dc.subjectParticles (Nuclear physicsen_US
dc.subjectAstronomyen_US
dc.subjectAstrophysicsen_US
dc.subjectProtonsen_US
dc.subjectUncertaintyen_US
dc.subjectBrightness temperatureen_US
dc.titleMeasurement of the Proton Form Factor by Studying e⁺e⁻ → pp̅en_US
dc.type.genreArticleen_US

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