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 232fb-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±0.18stat±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.

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

LANCERI, LIVIO;VITALE, LORENZO;
2013-01-01

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 232fb-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±0.18stat±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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2769133
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 115
  • ???jsp.display-item.citation.isi??? 57
social impact