Measurement of $CP$ violation in $B^0$ → $$J/ψK^S_0$$ and $B^0$ → $$ψ(2S)K^S_0$$ decays
A measurement is presented of decay-time-dependent $CP$ violation in the decays $B^0$ → $$J/ψ K^S_0$$ and $B^0$ → $$ψ(2S)K^S_0$$, where the $J/ψ$ is reconstructed from two electrons and the $ψ(2S)$ from two muons. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The $CP$-violation observables are measured to be $$$$ C(B^0 → J/ψ K_S^0) = 0.12± 0.07 ± 0.02, $$$$ $$$$ S(B^0 → J/ψ K_S^0) = 0.83 ± 0.08 ± 0.01, $$$$ $$$$ C(B^0 → ψ(2S) K_S^0) = -0.05 ± 0.10 ± 0.01, $$$$ $$$$ S(B^0 → ψ(2S) K_S^0) = 0.84 ± 0.10 ± 0.01, $$$$ where $$C$$ describes $CP$ violation in the direct decay, and $$S$$ describes $CP$ violation in the interference between the amplitudes for the direct decay and for the decay after $B^0$ - $$\bar{B}^0$$ oscillation. The first uncertainties are statistical and the second are systematic. The two sets of results are compatible with the previous LHCb measurement using $B^0$ → $$J/ψ K^S_0$$ decays, where the $J/ψ$ meson was reconstructed from two muons. The averages of all three sets of LHCb results are under the assumption that higher-order contributions to the decay amplitudes are negligible. The uncertainties include statistical and systematic contributions.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- The LHCb collaboration
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1525249
- Journal Information:
- Journal of High Energy Physics (Online), Vol. 2017, Issue 11; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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