Study of $\mathrm{B}^{+} \rightarrow \bar{\mathrm{D}}^{0}\pi^{+}\pi^{-}\pi^{+}$ at the Belle II experiment

Sumitted to PubDB: 2023-05-25

Category: Master Thesis, Visibility: Public

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Authors	James Frederick Libby, Shubhajit Sana
Date	Jan. 1, 2023
Belle II Number	BELLE2-MTHESIS-2023-017
Abstract	We have studied a rare decay channel $\mathrm{B}^{+} \rightarrow \bar{\mathrm{D}}^{0}\pi^{+}\pi^{-}\pi^{+}$ using 200~fb$^{-1}$ Monte Carlo simulated data generated by the Belle-II software framework. Topological analysis is being performed to identify the major sources of peaking background and appropriate veto is being applied to suppress them. A Machine Learning algorithm has been utilized to distinguish between the signal and the dominant continuum background based on their distinctive topological characteristics. The measured value of the branching ratio for the decay channel is \textbf{(11.1 $\pm$ 0.1) $\times$ 10$^{-3}$} which is consistent with the figure specified in the decay file used for the production of generic Monte Carlo (MC). However, this result encompasses the contribution from strong intermediate resonance states, such as $a^{-}_{1}$ and $\rho^{0}$.
Conference	Chennai, India