EPJ Web Conf.
Volume 218, 2019The 11th International Workshop on e+e− Collisions from Phi to Psi (PhiPsi 2017)
|Number of page(s)||6|
|Section||Hadronic Cross Section Measurements in e+e− Annihilations|
|Published online||18 October 2019|
Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector
Sezione INFN/ Pisa, Italy
* e-mail: firstname.lastname@example.org
Published online: 18 October 2019
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
© The Authors, published by EDP Sciences, 2019
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