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 ψ(2S)π^+)}{\mathcal{B}(B_c^+ \to J/ψπ^+)} = 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 $\mathcal{B}(\psi (2S)\to {\mu }^{+}{\mu }^{-})/\mathcal{B}(J/\psi \to {\mu }^{+}{\mu }^{-})$.

12 pages including author list, 2 figures

References in corpus (2)

• PYTHIA 6.4 Physics and Manual
• Measurement of the Bc meson mass in the exclusive decay Bc --> Jpsi Pi

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