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dc.contributor.authorKolcu, Onur Buğra
dc.contributor.authorYüncü, Alperen
dc.date.accessioned2020-02-14T08:06:51Z
dc.date.available2020-02-14T08:06:51Z
dc.date.issued2019
dc.identifier.other122003tr_TR
dc.identifier.urihttps://doi.org/10.1103/PhysRevLett.123.122003tr_TR
dc.identifier.urihttps://dspace.ankara.edu.tr/xmlui/handle/123456789/69506
dc.description.abstractThe exclusive process eþe− → ΛΛ¯ , with Λ → pπ− and Λ¯ → p¯ πþ, has been studied at ffiffi s p ¼ 2.396 GeV for measurement of the timelike Λ electric and magnetic form factors, GE and GM. A data sample, corresponding to an integrated luminosity of 66.9 pb−1, was collected with the BESIII detector for this purpose. A multidimensional analysis with a complete decomposition of the spin structure of the reaction enables a determination of the modulus of the ratio R ¼ jGE=GMj and, for the first time for any baryon, the relative phase ΔΦ ¼ ΦE − ΦM. The resulting values are R ¼ 0.960.14ðstatÞ0.02ðsystÞ and ΔΦ ¼ 37° 12°ðstatÞ 6°ðsystÞ, respectively. These are obtained using the recently established and most precise value of the asymmetry parameter αΛ ¼ 0.750 0.010 measured by BESIII. In addition, the cross section is measured with unprecedented precision to be σ ¼ 118.75.3ðstatÞ5.1ðsystÞ pb, which corresponds to an effective form factor of jGj ¼ 0.1230.003ðstatÞ0.003ðsystÞ. The contribution from two-photon exchange is found to be negligible. Our result enables the first complete determination of baryon timelike electromagnetic form factors.tr_TR
dc.language.isoentr_TR
dc.relation.isversionof10.1103/PhysRevLett.123.122003tr_TR
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.titleComplete Measurement of the Λ Electromagnetic Form Factorstr_TR
dc.typeArticletr_TR
dc.relation.journalPhysical Review Letterstr_TR
dc.contributor.departmentFen Fakültesitr_TR
dc.contributor.authorID55900757000tr_TR
dc.contributor.authorID56114654600tr_TR
dc.identifier.volume123tr_TR
dc.identifier.issue12tr_TR
dc.identifier.startpage01tr_TR
dc.identifier.endpage08tr_TR
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıtr_TR
dc.identifier.issn/e-issn0031-9007
dc.identifier.issn/e-issn1079-7114


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