000002947 001__ 2947
000002947 005__ 20220330162947.0
000002947 037__ $$aBELLE2-MTHESIS-2022-006
000002947 041__ $$aeng
000002947 100__ $$aTrevor Shillington
000002947 245__ $$aSensitivity study of the charged lepton flavour violating mode B+ to K+ tau+ e- at Belle II.
000002947 260__ $$aMontreal, QC$$bMcGill University$$c2021
000002947 300__ $$a86
000002947 500__ $$aPresented on 01 10 2021
000002947 502__ $$aMSc$$bMontreal, QC, McGill University$$c2021
000002947 520__ $$aBelle II is a B factory experiment for the SuperKEKB electron-positron collider located at the KEK laboratory in Tsukuba, Japan, operating near the Upsilon(4S) resonance, at an energy of 10.58 GeV. In this thesis we outline our analysis searching for the ultra-rare charged lepton flavour violating (CLFV) decay B+ to K+ tau+ e-. This decay is far below experimental sensitivity if we assume the decay rate predicted by the Standard Model. However, many extensions of the Standard Model, specifically those attempting to incorporate the recent "B physics anomalies", predict much larger branching fractions which are potentially within the reach of experiments. Discovery of this mode would be explicit evidence of physics beyond the Standard Model, while a null result would allow us to place strict constraints on these models. A previous search was done at BaBar in 2012, setting a 90% CL upper limit branching fraction of a few x 10^-5. The much larger integrated luminosity dataset at Belle II can be exploited to improve the analysis sensitivity by at least an order of magnitude. A sensitivity study is performed based on a dataset of 200 fb^-1, and a data/MC comparison is done.
000002947 700__ $$aSteven Robertson$$edir.
000002947 8560_ $$ftrshillington@gmail.com
000002947 8564_ $$uhttps://docs.belle2.org/record/2947/files/BELLE2-MTHESIS-2022-006.pdf
000002947 980__ $$aTHESIS