Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 49: Flavour physics 2

T 49.1: Talk

Tuesday, March 5, 2024, 16:00–16:15, Geb. 30.41: HS 4

First search for the decays Ξ_b⁰ → Ξ⁰ J/ψ and Ξ_b⁰ → Ξ⁰ ψ(2S) at the LHCb experiment — Johannes Albrecht¹, Vitalii Lisovskyi³, •Leandra Moeser¹, and Janina Nicolini^{1, 2} — ¹TU Dortmund University, Dortmund, Germany — ²IJCLab, Orsay, France — ³EPFL, Lausanne, Switzerland

Weak decays of heavy-quark baryons offer an attractive laboratory to search for effects beyond the Standard Model, complementary to searches in meson decays. Due to the high masses of b-baryons, most of them can only be studied at hadron colliders. The LHCb experiment is investigating such weakly decaying b-baryons, the most comprehensively studied of which is the Λ_b baryon, where tensions towards theoretical predictions have been observed. Further analyses of b-baryon decays would thus be beneficial.
The current status of the first search for the tree-level decays Ξ_b⁰ → Ξ⁰ J/ψ and Ξ_b⁰ → Ξ⁰ ψ(2S) and computation of the ratio of their respective branching fractions B(Ξ_b⁰ → Ξ⁰ ψ(2S)) / B(Ξ_b⁰ → Ξ⁰ J/ψ) is presented.
The used data was collected at the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb⁻¹.

Keywords: LHCb; Data Analysis; b-baryons