Speaker
Description
We introduce the Full Event Interpretation (FEI) at Belle II experiment. This method
is developed for the research based on SuperKEKB accelerator and Belle II
detector. The analyses with Belle II detector are to precisely measure the Standard
Model (SM) and to find the evidence of the New Physics beyond the SM are in
progress. Since the center-of-mass energy (√s) of SuperKEKB accelerator is
specified to 10.58 GeV to generate Υ(4S) that decays to the pair of B meson with
96% probability, the analyses with Belle II detector are generally focused on B
meson. One of the B meson is regarded and reconstructed as signal, while the
other B is not reconstructed. FEI is to reconstruct particles in the event
automatically to construct ‘other’ B meson, with boosted decision trees (BDT)
method. Since this method allows access of additional information calculated from
‘other’ B, it is possible to improve the quality of events, though in a situation that
complete reconstruction of signal B is forbidden due to invisible particles are
included in the decay mode. To take the advantage of FEI, a ‘tagging’ method has
been used in B meson analyses. We introduce the tagging algorithm of B meson
using BDT. We have applied FEI and tested the effect with one of
lepton-flavor-violating decay modes with simulated samples.
