Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 64: Flavor Physik II
T 64.1: Talk
Wednesday, March 21, 2018, 16:30–16:45, Z6 - SR 2.006
Measurement of the ratio RK∗ 0 using Run 2 data of the LHCb experiment — •Stephan Escher, Sarah Beranek, Christoph Langenbruch, Stefan Schael, and Eluned Smith — RWTH Aachen
In the Standard Model (SM) of particle physics flavour-changing neutral-current processes are forbidden at tree-level and can only occur in electroweak loop diagrams. Therefore, b→ s decays are rare and sensitive to heavy particles beyond the SM that can significantly contribute. In this model the coupling of gauge bosons to leptons are independent of their flavour, which is known as lepton flavour universality (LFU).
Thus, the RK∗ 0 ratio, defined as
RK∗ 0=B(B0→ K∗ 0µ+µ−)/B(B0→ K∗ 0e+e−), is predicted to be unity by the SM. The existence of a new particle, that couples differently to electrons and muons, could influence the RK∗ 0 ratio and lead to deviations from theory.
To this date, the most precise analysis of RK∗ 0 is performed by the LHCb collaboration using Run 1 data and shows a 2.4−2.5 σ deviation from the SM. An update of this analysis including the Run 2 data of LHCb will further increase the precision of the measurement.
This presentation will give an insight into the analysis strategy of the analysis of the combined Run 1 and 2 LHCb data with particular emphasis on the study and control of backgrounds.