Abstract
This chapter describes the measurement of the \(B ^0 \!\rightarrow D ^0 {\overline{D}{} ^0} K ^{*0} \) branching ratio using as reference decay mode \(B ^0 \!\rightarrow D ^{*-} D ^0 K ^+ \).
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Notes
- 1.
In this analysis we use only long track. In principle, upstream tracks could be added to maximise the yields in \(B ^0 \!\rightarrow D ^{*-} D ^0 K ^+ \) because of the softer momentum spectrum of \(\pi _{K^{*0}}\).
- 2.
Note that also in the data driven method the same dependency is used in LHCb.
- 3.
Pruning method is a technique in machine learning that reduces the size of decision trees by removing sections of the tree that provide little power to the classification of the instances. The goals of pruning are the reduction of the complexity in the final classifier and the achievement of a better predictive accuracy. This is done thanks to the reduction of over-fitting and removal of sections of a classifier that may be based on noisy or erroneous data.
- 4.
The signed decay length of the D mesons is obtained after constraining the \(K^{*0}\) vertex in the DTF.
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Quagliani, R. (2018). Measurement of the \(B ^0 \!\rightarrow D ^0 {\overline{D}{} ^0} K ^{*0} \) Branching Ratio. In: Study of Double Charm B Decays with the LHCb Experiment at CERN and Track Reconstruction for the LHCb Upgrade. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-01839-9_6
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