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Observation of the $B_s^0 \rightarrow J/ψφφ$ decay

Abstract : The $B_s^0 \rightarrow J/\psi \phi \phi$ decay is observed in $pp$ collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ recorded by the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV. This is the first observation of this decay channel, with a statistical significance of 15 standard deviations. The mass of the $B_s^0$ meson is measured to be $5367.08\,\pm \,0.38\,\pm\, 0.15$ MeV/c$^2$. The branching fraction ratio $\mathcal{B}(B_s^0 \rightarrow J/\psi \phi \phi)/\mathcal{B}(B_s^0 \rightarrow J/\psi \phi)$ is measured to be $0.0115\,\pm\, 0.0012\, ^{+0.0005}_{-0.0009}$. In both cases, the first uncertainty is statistical and the second is systematic. No evidence for non-resonant $B_s^0 \rightarrow J/\psi \phi K^+ K^-$ or $B_s^0 \rightarrow J/\psi K^+ K^- K^+ K^-$ decays is found.
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Contributor : Sabine Starita <>
Submitted on : Thursday, January 21, 2016 - 8:37:28 AM
Last modification on : Friday, November 6, 2020 - 11:44:14 AM

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R. Aaij, Y. Amhis, S. Barsuk, F. Fleuret, O. Kochebina, et al.. Observation of the $B_s^0 \rightarrow J/ψφφ$ decay . Journal of High Energy Physics, Springer Verlag (Germany), 2016, 03, pp.40. ⟨10.1007/JHEP03(2016)040⟩. ⟨in2p3-01259803⟩



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