# Observation of the decay $B_c^+ \to \psi(2S)\pi^+$

Abstract : The decay $B_c^+ \to \psi(2S)\pi^+$ with $\psi(2S) \to \mu^+\mu^-$ is observed with a significance of $5.2\,\sigma$ using $pp$ collision data corresponding to an integrated luminosity of $1.0\,\invfb$ collected by the LHCb experiment. The branching fraction of $B_c^+ \to \psi(2S)\pi^+$ decays relative to that of the $B_c^+ \to J/\psi\pi^+$ mode is measured to be \begin{equation*} \frac{\mathcal{B}(B_c^+ \to \psi(2S)\pi^+)}{\mathcal{B}(B_c^+ \to J/\psi\pi^+)} = 0.250 \pm 0.068 \,\text{stat} \pm 0.014 \,\text{\syst} \pm 0.006 \,(\mathcal{B}). \end{equation*} The last term is the uncertainty on the ratio $\mathcal{B}(\psi(2S) \to \mu^+\mu^-)/\mathcal{B}(J/\psi \to \mu^+\mu^-)$.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00798154
Contributor : Sabine Starita <>
Submitted on : Friday, March 8, 2013 - 10:02:45 AM
Last modification on : Friday, November 20, 2020 - 3:30:14 PM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Observation of the decay $B_c^+ \to \psi(2S)\pi^+$. Physical Review D, American Physical Society, 2013, 87, pp.071103. ⟨10.1103/PhysRevD.87.071103⟩. ⟨in2p3-00798154⟩

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