Search for new decays of the Λ⁰_b baryon at the LHCb experiment

Institute for Theoretical and Experimental Physics, NRC «Kurchatov Institute», B. Cheremushkinskaya st. 25, Moscow, 117218, Russia

^* e-mail: Dmitrii.Pereima@cern.ch

Published online: 19 November 2019

Abstract

High statistics collected by the LHCb experiment between 2011 and 2018 in proton-proton (pp) collisions at the Large Hadron Colllider (LHC), jointly with the large cross-section of bb⁻ pairs production provides unique possibility for the search and study new decays of beauty hadrons. The results of search for new decays of the Λ⁰_b baryons are presented. In particular the decays Λ⁰_b → Λ⁺_c pp⁻π⁻, Λ⁰_b → J/ψΛ, Λ⁰_b → ψ(2S)Λ, Λ⁰_b → ψ(2S)pπ⁻, Λ⁰_b → χ_c1(3872)pK⁻ and Λ⁰_b → Λ_γ are found and branching fraction ratios measurement for these decays are done. Also the study of the Λ⁰_bπ⁺π⁻ systems led to the observation of two new excited Λ⁰_b states, denoted as Λ_b(6146)⁰ and Λ_b(6152)⁰, are found.