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Abstract
| In this work, the most recent heavy-flavour results from the CMS Collaboration with data collected during LHC Run-2 period are presented. Firstly, the search for χ$_{b}$(3$P$) states, through their decays to $\Upsilon$(3$S$)$\gamma$, is presented. Using data corresponding to an integrated luminosity of 80 fb$^{−1}$, the χ$_{b1}$(3$P$) and χ$_{b2}$(3$P$) states have been resolved for the first time. Secondly, the search for excited $B$$^{+}_{c}$ (2$S$) states, through their decay to $B$$^{+}_{c}$$\pi$$^{+}$$\pi$$^{-}$, is presented. With the full Run-2 data set, corresponding to 140 fb$^{−1}$, the $B$$^{+}_{c}$(2$S$) and $B$$^{+}_{c}$*(2$S$) states have been resolved for the first time. Finally, the search for the charge-lepton flavour violating decay $\tau$ → $\mu\mu\mu$, using an integrated luminosity of 33 fb$^{−1}$, is presented. No signal has been observed and a 90% confidence level upper limit on the branching fraction is set to 8.8·10$^{−8}$. |