Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 4: Flavour Physics 2
T 4.6: Vortrag
Montag, 21. März 2022, 17:30–17:45, T-H17
Angular analysis of B0→ K∗e+e− decays — Martino Borsato, Fabian Glaser, and •Jiangqiao Hu — Physikalisches Institut - Universität Heidelberg
Over the last decade, the LHCb detector at the Large Hadron Collider (LHC) collected the world largest sample of beauty hadron decays. This dataset allowed to study rare transitions of a b quark into an s quark and a pair of charged leptons (b→ sℓℓ) with unprecedented precision and unearthed a series of anomalies that could be a sign of dynamics beyond the Standard Model. Namely, the angular distributions of b→ sµµ decays do not agree with theoretical predictions and their rate is lower than that observed in b→ see decays, in contrast to the expectation dictated by the SM symmetry of lepton universality. A key measurement to solve this puzzle is the angular analysis of B0→ K∗e+e− decays. In this talk I will present my contribution to this analysis, focusing on the difficult kinematic region of high dielectron invariant mass. Advanced analysis techniques are used to classify signal candidates, characterise background contributions and measure the angular properties of the decay.