Measurement of the e+e−→ΛΛ¯ cross section from threshold to 3.00 GeV using events with initial-state radiation
Physics and Astronomy (miscellaneous)
Atomic
530
7. Clean energy
01 natural sciences
High Energy Physics - Experiment
MAGNETIC-MOMENT; TAGGED PHOTONS; STORAGE-RING; FINAL-STATES; MONTE-CARLO; ANNIHILATION; DETECTOR; COLLISIONS
Particle and Plasma Physics
0103 physical sciences
Nuclear
FINAL-STATES; MONTE-CARLO; DETECTOR; COLLISIONS;
SDG 7 - Affordable and Clean Energy
Quantum Physics
Molecular
HEP; BaBar
Particle and High Energy Physics
Nuclear and Plasma Physics
Nuclear & Particles Physics
Mathematical physics
Physical Sciences
Astronomical sciences
BaBar
PEP-II
Initial state radiation
Physics and Astronomy (miscellaneous); BaBar; PEP-II; Initial state radiation;
Astronomical and Space Sciences
DOI:
10.1103/physrevd.107.072005
Publication Date:
2023-04-18T15:56:53Z
AUTHORS (614)
ABSTRACT
We report a measurement of the e+e−→π+π−π0 cross section in the energy range from 0.62 to 3.50 GeV using an initial-state radiation technique. We use an e+e− data sample corresponding to 191 fb−1 of integrated luminosity, collected at a center-of-mass energy at or near the ϒ(4S) resonance with the Belle II detector at the SuperKEKB collider. Signal yields are extracted by fitting the two-photon mass distribution in e+e−→π+π−π0γ events, which involve a π0→γγ 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 ω and ϕ resonances is dominated by the systematic uncertainty of 2.2%. The resulting cross sections in the 0.62–1.80 GeV energy range yield aμ3π=[48.91±0.23(stat)±1.07(syst)]×10−10 for the leading-order hadronic vacuum polarization contribution to the muon anomalous magnetic moment. This result differs by 2.5 standard deviations from the most precise current determination. Published by the American Physical Society 2024
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