Angular analysis of the decay B0→K ∗0 J/ψ(→ e+e−)

Abstract

In this thesis the angular analysis of the B0→K ∗0 J/ψ(→ e+e−) decay is presented. This decay serves as a control channel in the decay B0→K∗0 e+e−. The angular observables describing the angular distributions of the decay were determined from a fit. The data sample that was used in this analysis is the data gathered by the LHCb detector in the year 2016 and corresponds to an integrated luminosity of 1.665 fb−1 at a total centre-of-momentum energy of 13 TeV. The S-wave component from the K+ π − system was included in the PDF describing the angular distributions. This contribution accounted for ∼ 12% of the events. The results from this analysis are statistically incompatible with the results of the angular analysis of K ∗0 J/ψ(→ µ + µ − ). However, a more extensive study of the various background components and their angular behaviour is needed.