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Observation of the B0s→η′η′ decay

Abstract : The first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb−1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31±0.64(stat)±0.28(syst)±0.12(norm)]×10−5, where the third uncertainty comes from the B±→η′K± branching fraction that is used as a normalisation. In addition, the charge asymmetries of B±→η′K± and B±→ϕK±, which are control channels, are measured to be (−0.2±1.3)% and (+1.7±1.3)%, respectively. All results are consistent with theoretical expectations.
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Contributor : Sabine Starita <>
Submitted on : Thursday, March 26, 2015 - 11:57:28 AM
Last modification on : Thursday, February 25, 2021 - 10:58:34 AM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Observation of the B0s→η′η′ decay. Physical Review Letters, American Physical Society, 2015, 115, pp.051801. ⟨10.1103/PhysRevLett.115.051801⟩. ⟨in2p3-01135965⟩



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