000002845 001__ 2845
000002845 005__ 20220203170009.0
000002845 037__ $$aBELLE2-MTHESIS-2022-003
000002845 041__ $$aeng
000002845 100__ $$aLucas MARTEL
000002845 245__ $$aSEARCH FOR B → K (∗) ν ν̄ DECAYS IN BELLE II
000002845 260__ $$aStrasbourg, France$$bUniversite de Strasbourg$$c2020
000002845 300__ $$a21
000002845 500__ $$aPresented on 18 06 2020
000002845 502__ $$aMSc$$bStrasbourg, France, Universite de Strasbourg$$c2020
000002845 520__ $$aThe B → K (∗) ν ν̄ decay channel, never discovered to this day, is actively sought for in the Belle II experiment. Its branching fraction of the order of 10 −6 could be significantly skewed by new physics, which makes it a potential probe for physics beyond the Standard Model. During this internship, we simulated and analyzed pairs of B mesons produced by SuperKEKB collisions and registrated by the Belle II detector. The goal of the analysis is to assess the event reconstruction efficiency of a key algorithm, the Full Event Interpretation, in the case where one of the two B mesons decays to an invisible state (e.g into neutrinos or unknown invisible particles).Finally, these reconstruction performances are studied with two different simulated samples for the Belle II experiment as well as on a simulated sample for the Belle experiment (Belle II’s predecessor) and we investigate leads for improvement in order to improve the sensitivity for the B → K (∗) ν ν̄ channel.
000002845 700__ $$aIsabelle RIPP-BAUDOT$$edir.
000002845 700__ $$aGiulio DUJANY$$edir.
000002845 8560_ $$flucas.martel@iphc.cnrs.fr
000002845 8564_ $$uhttps://docs.belle2.org/record/2845/files/BELLE2-MTHESIS-2022-003.pdf
000002845 980__ $$aTHESIS