Regular Article - Theoretical Physics
Impacts of radiative corrections on measurements of lepton flavour universality in decays
INFN Laboratori Nazionali di Frascati, Via Enrico Fermi, 40, 00044, Frascati, Italy
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Accepted: 27 August 2019
Published online: 7 September 2019
Radiative corrections to decays may have an impact on predictions and measurements of the lepton flavour universality observables and . In this paper, a comparison between recent calculations of the effect of soft-photon corrections on and , and corrections generated by the widely used package Photos is given. The impact of long-distance Coulomb interactions, which are not simulated in Photos, is discussed. Furthermore, the effect of high-energy photon emission is studied through pseudo-experiments in an LHCb-like environment. It is found that over- or underestimating these emissions can cause a bias on as high as 7%. However, this bias depends on individual analyses, and future high precision measurements require an accurate evaluation of these QED corrections.
© The Author(s), 2019