Precise Measurement of the e⁺e⁻ → π⁺π⁻ (γ) Cross Section with the Initial-State Radiation Method at BABAR

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Precise Measurement of the e⁺e⁻ → π⁺π⁻ (γ) Cross Section with the Initial-State Radiation Method at BABAR

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Title: Precise Measurement of the e⁺e⁻ → π⁺π⁻ (γ) Cross Section with the Initial-State Radiation Method at BABAR
Author(s):
Lees, J. P.;
Poireau, V.;
Tisserand, V.;
Garra Tico, J.;
Grauges, E.;
Palano, A.;
Eigen, G.;
Izen, Joseph M.;
Lou, Xinchou;
BaBar Collaboration
Date Created: 2012-08-28
Format: Text
Item Type: Article
Keywords: Leptons
Luminosity
Muons
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 π π cross section from threshold to 1.8 GeV is (514.1 ± 2.2(stat) ± 3.1(syst))×10⁻¹⁰.
Publisher: American Physical Society
ISSN: 1550-7998
Source: Physical Review D - Particles, Fields, Gravitation and Cosmology
Link to Related Resource: http://dx.doi.org/10.1103/PhysRevD.86.032013
Persistent Link: http://hdl.handle.net/10735.1/3087
Bibliographic Citation: Lees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, et al. 2012. "Precise measurement of the e⁺e⁻ → π⁺π⁻(γ) cross section with the initial-state radiation method at BABAR." Physical Review D - Particles, Fields, Gravitation and Cosmology 86(3), doi:10.1103/PhysRevD.86.032013
Terms of Use: © 2012 American Physical Society

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