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Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector.
- Source :
-
EPJ Web of Conferences . 10/18/2019, Vol. 218, p1-6. 6p. - Publication Year :
- 2019
-
Abstract
- I will report on the recent measurement of the fine structure constant below 1 GeV with the KLOE detector. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time-and space-like regions achieved in a single measurement. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω → µ+µ−) = (6.6 ± 1.4stat ± 1.7syst) · 10−5 has been determined [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 21016275
- Volume :
- 218
- Database :
- Academic Search Index
- Journal :
- EPJ Web of Conferences
- Publication Type :
- Conference
- Accession number :
- 139291889
- Full Text :
- https://doi.org/10.1051/epjconf/201921802012