De Mori, F. (2024) R-value measurements at BESIII. Il nuovo cimento C, 47 (4). pp. 1-4. ISSN 1826-9885
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Abstract
The R-value, defined as the ratio of inclusive hadronic cross section over dimuon cross section from electron-positron annihilation, is an important quantity that contributes to the SM prediction of the muon anomalous magnetic moment, and in the determination of the QED running coupling constant evaluated at the Z-pole. At BESIII, the R-value is measured with a total of 14 data points with the corresponding c.m. energy going from 2.2324 to 3.6710 GeV. The statistical uncertainty of the measured R is less than 0.6%. Two different simulation models, the LUARLW and a new hybrid generator, are used and give consistent detection and initial-state radiation corrections. An accuracy of better than 2.6% below 3.1 GeV and 3.0% above is achieved in the R-value measurements.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 22 Oct 2024 10:04 |
| Last Modified: | 22 Oct 2024 10:04 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/23228 |
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