Speaker
Isabella Garzia
(Istituto Nazionale di Fisica Nucleare)
Description
A measurement of the key $e^+e^-\rightarrow \pi^+\pi^-$ cross section relevant for the hadronic vacuum polarization (HVP) is presented using the full BABAR data set. The analysis employs a novel method that does not rely on particle identification to separate pions and muons, and is therefore fully independent of the BABAR 2009 analysis. This result is expected to play an important role in clarifying the current situation, where significant discrepancies are observed between the extreme results reported by KLOE and CMD-3, which presently prevent a reliable averaging of the $e^+e^-\rightarrow \pi^+\pi^-$ cross sections for the determination of the HVP contribution to the muon anomalous magnetic moment.
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Authors
Isabella Garzia
(Istituto Nazionale di Fisica Nucleare)
Janis McKenna
(University of British Columbia)