Speaker
José Helder Lopes
(UFRJ)
Description
The analysis of charmless decays $B^{\pm}\rightarrow
h_1^{\pm}h_2^{+}h_3^{-}$, where $h_i$ are pions or kaons, collected by
LHCb in Run I, show strong evidence for CP asymmetries in the
three-body phase space. We are now analyzing data collected in Run II
(2015+2016) and will combine the results with the ones from Run I. After
a loose pre-selection, we use a multivariate method (MVA) to improve the
signal significance. We show here the comparison of results with
different inputs and different MVA methods, particularly boosted
decision trees (BDT) and artificial neural networks (MLP). Our final
choice, for the good performance and simplicity, is BDT with a reduced
set of input variables, as compared to Run I selection.
Author
José Helder Lopes
(UFRJ)
