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First observation of a baryonic B+c decay

MPS-Authors
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Blouw,  J.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Britsch,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Fontana,  Marianna
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Popov,  Dmitry
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Schmelling,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Volyanskyy,  Dmytro
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Voss,  Helge
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Zavertyaev,  M.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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1408.0971.pdf
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Citation

LHCb Collaboration, Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2014). First observation of a baryonic B+c decay. Physical Review Letters, 113(15): 152003. doi:10.1103/PhysRevLett.113.152003.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-6FAC-F
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/\psi p\overline{p}\pi^+)}{\mathcal{B}(B_c^+\to J/\psi \pi^+)} = 0.143^{\,+\,0.039}_{\,-\,0.034}\,(\mathrm{stat})\pm0.013\,(\mathrm{syst}). \end{equation*} The mass of the $B_c^+$ meson is determined as $M(B_c^+)=6274.0\pm1.8\,(\mathrm{stat})\pm0.4\,(\mathrm{syst})\,\mathrm{MeV}/c^2$, using the $B_c^+\to J/\psi p\overline{p}\pi^+$ channel.