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T: Fachverband Teilchenphysik

T 31: Flavourphysik 1

T 31.5: Vortrag

Dienstag, 28. März 2017, 12:00–12:15, JUR 490

First observation of the decays Λ_b⁰→Λ_c⁺D^(*)0K⁻ with the LHCb experiment — •Marian Stahl for the LHCb collaboration — Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg

The decays Λ_b⁰→Λ_c⁺D^(*)0K⁻ allow to search for the open charm decays Λ_c⁺D^(*)0 of the P_c pentaquark candidates recently discovered by LHCb.
Here, the first observation of Λ_b⁰→Λ_c⁺D^(*)0K⁻ is reported and its branching fraction relative to Λ_b⁰→ Λ_c⁺ D_s⁻ is measured. Charm hadrons are reconstructed in the pK⁻π⁺, K⁺π⁻ and K⁺K⁻π⁻ final states for Λ_c⁺, D⁰ and D_s⁻ respectively. The decay involving D^*(2007)⁰ is partially reconstructed with a missing π⁰ or γ.
A future amplitude analysis will profit from an optimized selection of signal candidates and the determination of efficiencies across the Λ_c⁺D^(*)0K⁻ Dalitz plots, carried out in this analysis.