KEK seminar on the e+e- -> pipipi0 result

Sumitted to PubDB: 2024-05-01

Category: Talk, Visibility: Public

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Authors	Yuki Sue
Date	April 10, 2024
Belle II Number	BELLE2-TALK-CONF-2024-056
Abstract	Current measurements and theoretical predictions of the muon anomalous magnetic moment a_mu disagree. Theoretical predictions on hadronic vacuum polarization corrections to a_mu are based on dispersive relations that require measurements of e+e- to hadron cross sections as inputs. The uncertainties on these measurements are the largest source of uncertainty on the prediction. The three-pion cross section is the second largest contribution to the hadronic vacuum polarization (HVP) of the muon anomalous magnetic moment. We report a measurement of the e+e- → pi+pi-pi-0 cross section in the energy range from 0.62 GeV to 3.50 GeV. The e+e- data sample used in the measurement was collected at or near the Upsilon(4S) resonance with the Belle II detector at the SuperKEKB collider, corresponding to 191 fb^{-1} of integrated luminosity. The uncertainty on the cross section at the omega and phi resonances is dominated by the systematic uncertainty of 2.2%. The corresponding contribution to a_mu is (48.91 +- 0.21 (stat)+-1.07 (syst))x10^-10.
Conference	IPNS physics seminar