A precise measurement of the cross section for the process e +e-→K+K-(γ) from threshold to an energy of 5 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 measurement uses the effective ISR luminosity determined from the e +e-→μ+μ-(γ) γISR process with the same data set. The corresponding lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is found to be aμKK,LO=(22.93±0.18 stat±0.22syst)×10-10. The charged kaon form factor is extracted and compared to previous results. Its magnitude at large energy significantly exceeds the asymptotic QCD prediction, while the measured slope is consistent with the prediction.

Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2013). Precision measurement of the e+e-→K +K-(γ) cross section with the initial-state radiation method at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(3) [10.1103/PhysRevD.88.032013].

Precision measurement of the e+e-→K +K-(γ) cross section with the initial-state radiation method at BABAR

CARPINELLI, Massimo
Membro del Collaboration Group
;
2013

Abstract

A precise measurement of the cross section for the process e +e-→K+K-(γ) from threshold to an energy of 5 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 measurement uses the effective ISR luminosity determined from the e +e-→μ+μ-(γ) γISR process with the same data set. The corresponding lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is found to be aμKK,LO=(22.93±0.18 stat±0.22syst)×10-10. The charged kaon form factor is extracted and compared to previous results. Its magnitude at large energy significantly exceeds the asymptotic QCD prediction, while the measured slope is consistent with the prediction.
Articolo in rivista - Articolo scientifico
Scientifica
BABAR detector
English
Carpinelli Massimo (BABAR Collaboration)
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2013). Precision measurement of the e+e-→K +K-(γ) cross section with the initial-state radiation method at BABAR. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(3) [10.1103/PhysRevD.88.032013].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/389230
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