Measurement of the cross section in the energy range 0.62-3.50 GeV at Belle II
Sumitted to PubDB: 2024-04-09
Category: Physics / performance paper, Visibility: Public
Tags:
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Authors |
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Non-Belle II authors |
Belle II Collaboration |
Date |
April 7, 2024 |
Belle II Number |
BELLE2-PUB-PH-2024-002 |
Abstract |
We report a measurement of the cross section in the energy range from 0.62 to 3.50 GeV using an initial-state radiation technique. We use an data sample corresponding to 191 of integrated luminosity, collected at a center-of-mass energy at or near the resonance with the Belle II detector at the SuperKEKB collider. Signal yields are extracted by fitting the two-photon mass distribution in events, which involve a decay and an energetic photon radiated from the initial state. Signal efficiency corrections with an accuracy of 1.6% are obtained from several control data samples. The uncertainty on the cross section at the and resonances is dominated by the systematic uncertainty of 2.2%. The resulting cross sections in the 0.62-1.80 GeV energy range yield for the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. This result differs by standard deviations from the most precise current determination. |
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