Precise measurement of the e^+e^- → π^+π^-(γ) cross section with the initial-state radiation method at BABAR
Abstract
A precise measurement of the cross section of the process e^+e^-→π^+π^-(γ) from threshold to an energy of 3 GeV is obtained with the initial-state radiation (ISR) method using 232 fb^(-1) of data collected with the BABAR detector at e^+e^- center-of-mass energies near 10.6 GeV. The ISR luminosity is determined from a study of the leptonic process e^+e^-→μ^+μ^-(γ)γ_(ISR), which is found to agree with the next-to-leading-order QED prediction to within 1.1%. The cross section for the process e^+e^-→π^+π^-(γ) is obtained with a systematic uncertainty of 0.5% in the dominant ρ resonance region. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured ππ cross section from threshold to 1.8 GeV is (514.1±2.2(stat)±3.1(syst))×10^(-10).
Additional Information
© 2012 American Physical Society. Received 14 May 2012; published 28 August 2012. 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 US 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).Attached Files
Published - PhysRevD.86.032013.pdf
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Additional details
- Eprint ID
- 34491
- Resolver ID
- CaltechAUTHORS:20120927-084812329
- Department of Energy (DOE)
- NSF
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Commissariat à l'Energie Atomique (CEA)
- Bundesministerium für Bildung und Forschung (BMBF)
- Istituto Nazionale di Fisica Nucleare (INFN)
- Stichting voor Fundamenteel Onderzoek der Materie (FOM)
- Research Council of Norway
- Ministry of Education and Science of the Russian Federation
- Ministerio de Ciencia e Innovaciόn (MICINN)
- Science and Technology Facilities Council (STFC)
- Marie Curie Fellowship
- Alfred P. Sloan Foundation
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Deutsche Forschungsgemeinschaft (DFG)
- Created
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2012-09-27Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field