Abstract
We present a software framework for Belle II that reconstructs B mesons in many decay modes with minimal user intervention. It does so by reconstructing particles in user-supplied decay channels, and then in turn using these reconstructed particles in higher-level decays. This hierarchical reconstruction allows one to cover a relatively high fraction of all B decays by specifying a limited number of particle decays. Multivariate classification methods are used to achieve a high signal-to-background ratio in each individual channel. The entire reconstruction, including the application of pre-cuts and classifier trainings, is automated to a high degree and will allow users to retrain to account for analysis-specific signal-side selections.
Highlights
Belle II is an experiment being built at the e+e− SuperKEKB B factory in Tsukuba, Japan, and is planned to have a luminosity 40 times higher than its predecessor Belle [1]
We present a software framework for Belle II that reconstructs B mesons in many decay modes with minimal user intervention
This is equivalent to reconstructing the Υ(4S), but requires a high efficiency in the Btag reconstruction to be of use
Summary
Belle II is an experiment being built at the e+e− SuperKEKB B factory in Tsukuba, Japan, and is planned to have a luminosity 40 times higher than its predecessor Belle [1]. One can make use of the fact that in a correctly reconstructed event every track must come from one of the B mesons, so requiring the absence of additional particles improves the purity of the selection This is equivalent to reconstructing the Υ(4S), but requires a high efficiency in the Btag reconstruction to be of use. 2. Hierarchical reconstruction To this end, a neural-network-assisted reconstruction of B mesons in many decay channels was pioneered at the Belle experiment which reconstructs decays of particles into their immediate daughters and combines the output until reaching the B meson level [2]. Hierarchical reconstruction To this end, a neural-network-assisted reconstruction of B mesons in many decay channels was pioneered at the Belle experiment which reconstructs decays of particles into their immediate daughters and combines the output until reaching the B meson level [2]
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