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Measurement of the proton form factor by studying e+e- → pp¯ M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Contributor(s): Ablikim, M | Ai, X. C | Chelkov, G. A | Achasov, M. N | Томский государственный университет Радиофизический факультет Научные подразделения РФФMaterial type: ArticleArticleSubject(s): BESIII, детектор | коллайдеры | протоныGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review D Vol. 91, № 11. P. 112004-1-112004-12Abstract: Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e+e−→pp¯ 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 (|GE|=|GM|). In addition, the ratio of electric to magnetic form factors, |GE/GM|, and |GM| are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at s√=2232.4 and 2400.0 MeV and a combined sample at s√=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%. The |GE/GM| ratios are close to unity and consistent with BABAR results in the same q2 region, which indicates the data are consistent with the assumption that |GE|=|GM| within uncertainties.
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Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e+e−→pp¯ 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 (|GE|=|GM|). In addition, the ratio of electric to magnetic form factors, |GE/GM|, and |GM| are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at s√=2232.4 and 2400.0 MeV and a combined sample at s√=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%. The |GE/GM| ratios are close to unity and consistent with BABAR results in the same q2 region, which indicates the data are consistent with the assumption that |GE|=|GM| within uncertainties.

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