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Publications du LPNHE |  |
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Publications du LPNHE | |
| HAL : in2p3-00697175, version 1 |
| arXiv : 1205.2228 |
| DOI : 10.1103/PhysRevD.86.032013 |
| Fiche détaillée |  Récupérer au format |
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| Physical Review D 86 (2012) 032013 |
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| Precise Measurement of the e+ e- --> pi+ pi- (gamma) Cross Section with the Initial-State Radiation Method at BABAR |
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| BABAR Collaboration(s) |
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| (2012) |
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| A precise measurement of the cross section of the process $e^+e^-\to\pi^+\pi^-(\gamma)$ from threshold to an energy of 3GeV is obtained with the initial-state radiation (ISR) method using $232\invfb$ of data collected with the BaBar detector at $e^+e^-$ center-of-mass energies near 10.6GeV. The ISR luminosity is determined from a study of the leptonic process $e^+e^-\to\mu^+\mu^-(\gamma)\gamma_{\rm ISR}$, which is found to agree with the next-to-leading-order QED prediction to within 1.1%. The cross section for the process $e^+e^-\to\pi^+\pi^-(\gamma)$ is obtained with a systematic uncertainty of 0.5% in the dominant $\rho$ resonance region. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured $\pi\pi$ cross section from threshold to 1.8GeV is $(514.1 \pm 2.2({\rm stat}) \pm 3.1({\rm syst}))\times 10^{-10}$. |
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| Thème(s) | : | Physique/Physique des Hautes Energies - Expérience |
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| Lien vers le texte intégral : |
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| http://fr.arXiv.org/abs/1205.2228 |
| in2p3-00697175, version 1 | |
| http://hal.in2p3.fr/in2p3-00697175 | |
| oai:hal.in2p3.fr:in2p3-00697175 | |
| Contributeur : Nicole Berger | |
| Soumis le : Lundi 14 Mai 2012, 16:52:28 | |
| Dernière modification le : Lundi 3 Septembre 2012, 14:22:47 | |
