Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 63: Flavorphysik II
T 63.7: Talk
Wednesday, March 27, 2019, 17:30–17:45, S15
Measurement of the ratio of branching fractions of the decays Λb0 → ψ(2S) Λ0 and Λb0 → J/ψ Λ0 at LHCb — •Patrick Mackowiak — Experimentelle Physik 5, TU Dortmund
The aim of this analysis is the measurement of the ratio of branching fractions Br(Λb0 → ψ(2S) Λ0)/Br(Λb0 → J/ψ Λ0), where the decay of the Λb0 is reconstructed through the decays of ψ(2S)→ µµ or J/ ψ → µµ and Λ0 → p π.
A measurement of the ATLAS collaboration of this ratio shows a deviation to a theory prediction and similar ratios from the b meson sector. Using data from the LHCb experiment, a more sensitive result is expected.
By measuring the ratio of branching fractions, systematic uncertainties, uncertainties from the measured luminosity, and from fragmentation effects cancel.
The talk will cover the current status of the analysis using the Run I dataset of the LHCb experiment, which corresponds to an integrated luminosity of 3 fb−1.