Speaker
Description
Belle II provides an excellent environment to study missing energy modes. These studies need a complete reconstruction of one of the two B mesons produced in the collision. Belle II has a dedicated algorithm called Full Event Interpretation(FEI) for reconstructing a $B$ meson. FEI follows a hierarchical approach employing multivariate analysis at each stage to reconstruct the exclusive $B$ meson decays. FEI depends on Monte Carlo(MC) samples for the BDT training. However, the FEI reconstruction suffers from significant data-MC discrepancy due to limited knowledge of $B$ meson decays and incorrect MC models. To correct this, a calibration can be performed by measuring a well-known decay with sufficient statistics. Here, calibration factors are calculated to correct the efficiency of hadronic modes using $B\to X\pi(X=D,D^{(*)})$ decays in 362 fb$^{−1}$ of Belle II data.
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