Falla Solórzano, María M.

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Analysis of a Λ_(b)^(0) decay
(2013) Falla Solórzano, María M.; Méndez Mella, Héctor; College of Arts and Science - Science; Santana Colón, Samuel A.; Ramírez Vargas, Juan Eduardo; Department of Physics; Carlo, Héctor
This thesis presents a preliminary results for the first observation of the exclusive Λ_(b)^(0) → Λ0ψ(2S) decay with a significance of 7.8 σ. The data sample used in this work, corresponding to an integrated luminosity of approximately 5.3 fb−1, was collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) in proton-proton collisions at √s=7 TeV. The preliminary relative branching fraction is measured with respect to the normalizing Λ_(b)^(0) → Λ0J/ψ decay mode where the ψ(2S) has been reconstructed in the ψ(2S) → μ+μ− decay mode, the Λ0 → pπ− final state and the J/ψ in the μ+μ−. The B(Λ0b → Λ0ψ(2S))/B(Λ0b → Λ0J/ψ) has been measured to be 0.66 ±0.11(stat) ±0.07(syst) ±0.07(PDG), where the second and third terms are the statistical and systematic uncertainties and the PDG uncertainty term is due to the J/ψ/ψ(2S) relative branching fraction in the dimuon channel. This result is still under review by the CMS collaboration and it is not an official result yet.