First observation of a baryonic $B_c^{+}$ decay

Abstract

A baryonic decay of the $B_c^{+}$ meson, $B_c^{+}\to J/\psi p\overline{p}{\pi }^{+}$, is observed for the first time, with a significance of $7.3$ standard deviations, in $pp$ collision data collected with the LHCb detector and corresponding to an integrated luminosity of $3.0$ fb${}^{-1}$ taken at center-of-mass energies of $7$ and $8$ $\mathrm{TeV}$. With the $B_c^{+}\to J/\psi {\pi }^{+}$ decay as normalization channel, the ratio of branching fractions is measured to be \begin{equation*} \frac{\mathcal{B}(B_c^+\to J/ψp\overline{p}π^+)}{\mathcal{B}(B_c^+\to J/ψπ^+)} = 0.143^{\,+\,0.039}_{\,-\,0.034}\,(\mathrm{stat})\pm0.013\,(\mathrm{syst}). \end{equation*} The mass of the $B_c^{+}$ meson is determined as $M(B_c^{+})=6274.0\pm 1.8(\mathrm{stat})\pm 0.4(\mathrm{syst})\mathrm{MeV}/c^2$, using the $B_c^{+}\to J/\psi p\overline{p}{\pi }^{+}$ channel.

20 pages, 2 figures

References in corpus (5)

• PYTHIA 6.4 Physics and Manual
• Measurement of the Bc meson mass in the exclusive decay Bc --> Jpsi Pi
• Study of the decay mechanism for B+ to p pbar K+ and B+ to p pbar pi+
• Measurement of the $B_c^{+}$ meson lifetime using $B_c^{+}\to J/\psi {\mu }^{+}{\nu }_{\mu }X$ decays
• Evidence for the decay $B_c^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$

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