SEARCH FOR B → K (∗) ν ν̄ DECAYS IN BELLE II

Sumitted to PubDB: 2022-02-03

Category: Master Thesis, Visibility: Public

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Authors	Giulio Dujany, Lucas Martel, Isabelle Ripp-Baudot
Date	Jan. 1, 2020
Belle II Number	BELLE2-MTHESIS-2022-003
Abstract	The B → K (∗) ν ν̄ decay channel, never discovered to this day, is actively sought for in the Belle II experiment. Its branching fraction of the order of 10 −6 could be significantly skewed by new physics, which makes it a potential probe for physics beyond the Standard Model. During this internship, we simulated and analyzed pairs of B mesons produced by SuperKEKB collisions and registrated by the Belle II detector. The goal of the analysis is to assess the event reconstruction efficiency of a key algorithm, the Full Event Interpretation, in the case where one of the two B mesons decays to an invisible state (e.g into neutrinos or unknown invisible particles).Finally, these reconstruction performances are studied with two different simulated samples for the Belle II experiment as well as on a simulated sample for the Belle experiment (Belle II’s predecessor) and we investigate leads for improvement in order to improve the sensitivity for the B → K (∗) ν ν̄ channel.
Conference	Strasbourg, France