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Published May 10, 2013 | Published
Journal Article Open

Study of e^+e^- → pp via initial-state radiation at BABAR


The process e^+e^-→pp γ is studied using 469  fb^(-1) of integrated luminosity collected with the BABAR detector at the SLAC National Accelerator Laboratory, at an e^+e^- center-of-mass energy of 10.6 GeV. From the analysis of the pp invariant mass spectrum, the energy dependence of the cross section for e^+e^-→pp is measured from threshold to 4.5 GeV. The energy dependence of the ratio of electric and magnetic form factors, |G_E/G_M|, and the asymmetry in the proton angular distribution are measured for pp masses below 3 GeV. The branching fractions for the decays J/ψ→pp and ψ(2S)→pp are also determined.

Additional Information

© 2013 American Physical Society. Received 3 February 2013; published 10 May 2013. We are grateful for the extraordinary contributions of our PEP-II colleagues in achieving the excellent luminosity and machine conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and the kind hospitality extended to them. This work is supported by the U.S. Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), the Commissariat à l'Energie Atomique and Institut National de Physique Nucléaire et de Physique des Particules (France), the Bundesministerium für Bildung und Forschung and Deutsche Forschungsgemeinschaft (Germany), the Istituto Nazionale di Fisica Nucleare (Italy), the Foundation for Fundamental Research on Matter (The Netherlands), the Research Council of Norway, the Ministry of Education and Science of the Russian Federation, Ministerio de Ciencia e Innovaciόn (Spain), and the Science and Technology Facilities Council (United Kingdom). Individuals have received support from the Marie-Curie IEF program (European Union) and the A. P. Sloan Foundation (USA).

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Published - PhysRevD.87.092005.pdf


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