Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 102: Flavour physics 4

T 102.5: Talk

Thursday, March 7, 2024, 17:00–17:15, Geb. 30.41: HS 4

Studies of resonance-enhanced angular and CP asymmetries in Λ_c⁺ → p µ⁺µ⁻ decays — •Marco Colonna, Serena Maccolini, and Dominik Mitzel — TU Dortmund University, Dortmund, Germany

The LHCb experiment has collected the largest sample of charm hadron decays, being a leader experiment in studying rare decays and investigating CP violation.

Suppressed semi-leptonic decays of charm baryons, like Λ_c⁺→ pµ⁺µ⁻, may shed a light on beyond-standard-model effects appearing in c → u µ⁺ µ⁻ transitions. Performing measurements of null test observables, like angular and CP asymmetries in the phase space regions where the physics signal is enhanced by the contribution of intermediate hadronic resonaces, allows to scrutinize the prediction of the Standard Model.

The talk presents the analysis and the methods applied to measure for the first time the CP and angular asymmetries of the Λ_c⁺→ pµ⁺µ⁻ decay in the phase space region dominated by the φ resonance contribution. The analysis uses data collected by the LHCb detector from 2016 to 2018 at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6fb⁻¹.

Keywords: LHCb; Charm; Rare Decays; CP asymmetry, Angular asymmetry