Search for the rare decays $B^{0}\to J/\psi \gamma$ and $B^{0}_{s} \to J/\psi \gamma$

Abstract : A search for the rare decay of a $B^{0}$ or $B^{0}_{s}$ meson into the final state $J/\psi\gamma$ is performed, using data collected by the LHCb experiment in $pp$ collisions at $\sqrt{s}=7$ and $8$ TeV, corresponding to an integrated luminosity of 3 fb$^{-1}$. The observed number of signal candidates is consistent with a background-only hypothesis. Branching fraction values larger than $1.7\times 10^{-6}$ for the $B^{0}\to J/\psi\gamma$ decay mode are excluded at 90% confidence level. For the $B^{0}_{s}\to J/\psi\gamma$ decay mode, branching fraction values larger than $7.4\times 10^{-6}$ are excluded at 90% confidence level; this is the first branching fraction limit for this decay.
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Physical Review D, American Physical Society, 2015, 92, pp.112002. 〈10.1103/PhysRevD.92.112002〉
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http://hal.in2p3.fr/in2p3-01217238
Contributeur : Sabine Starita <>
Soumis le : lundi 19 octobre 2015 - 11:21:13
Dernière modification le : jeudi 18 janvier 2018 - 01:49:09

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Search for the rare decays $B^{0}\to J/\psi \gamma$ and $B^{0}_{s} \to J/\psi \gamma$. Physical Review D, American Physical Society, 2015, 92, pp.112002. 〈10.1103/PhysRevD.92.112002〉. 〈in2p3-01217238〉

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