# First observation of the decay $B_{c}^{+}\to J/\psi K^+$

Abstract : The decay $B_c^+\to J/\psi K^+$ is observed for the first time using a data sample, corresponding to an integrated luminosity of 1.0 ${\,fb}^{-1}$, collected by the LHCb experiment in $pp$ collisions at a centre-of-mass energy of $7\mathrm{\,Te\kern -0.1em V}$. A yield of $46\pm12$ events is reported, with a significance of 5.0 standard deviations. The ratio of the branching fraction of $B_c^+\to J/\psi K^+$ to that of $B_c^+\to J/\psi\pi^+$ is measured to be $0.069\pm0.019\pm0.005$, where the first uncertainty is statistical and the second is systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00839856
Contributor : Danielle Cristofol Connect in order to contact the contributor
Submitted on : Monday, July 1, 2013 - 8:32:48 AM
Last modification on : Thursday, December 16, 2021 - 2:10:27 PM

### Citation

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, et al.. First observation of the decay $B_{c}^{+}\to J/\psi K^+$. Journal of High Energy Physics, Springer, 2013, 09, pp.075. ⟨10.1007/JHEP09(2013)075⟩. ⟨in2p3-00839856⟩

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