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Observation of the decay $B_s^0 \to \eta_c^\phi$ and evidence for $B_s^0 \to \eta_c\pi^+\pi^-$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Observation of the decay $B_s^0 \to \eta_c^\phi$ and evidence for $B_s^0 \to \eta_c\pi^+\pi^-$. Journal of High Energy Physics, 07:021.

Abstract

A study of $B_s^0 \to \eta_c\phi$ and $B^0_s \to \eta_c \pi^+\pi^-$ decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb$^{−1}$, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay $B_s^0 \to \eta_c\phi$ is reported, where the $\eta_c$ meson is reconstructed in the $p\overline{p}, K^+K^-\pi^+\pi^-, \pi^+\pi^-\pi^+\pi^-$ and $K^+K^-K^+K^-$ decay modes and the $\phi(1020)$ in the $K^+K^-$ decay mode. The decay $B_s^0 \to J/\psi\phi$ is used as a normalisation channel. Evidence is also reported for the decay $B_s^0 \to \eta_c\pi^+\pi^-$, where the $\eta_c$ meson is reconstructed in the $p\overline{p}$ decay mode, using the decay $B_s^0 \to J/\psi\pi^+\pi^-$ as a normalisation channel. The measured branching fractions are
$\mathcal{B}(B^0_s \to \eta_c\phi) = (5.01 \pm 0.53 \pm 0.27 \pm 0.63) \times 10^{−4}$,
$\mathcal{B}(B^0_s \to \eta_c\pi^+\pi^−) = (1.76 \pm 0.59 \pm 0.12 \pm 0.29) \times 10$^{−4}$,
where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.

Abstract

A study of $B_s^0 \to \eta_c\phi$ and $B^0_s \to \eta_c \pi^+\pi^-$ decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb$^{−1}$, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay $B_s^0 \to \eta_c\phi$ is reported, where the $\eta_c$ meson is reconstructed in the $p\overline{p}, K^+K^-\pi^+\pi^-, \pi^+\pi^-\pi^+\pi^-$ and $K^+K^-K^+K^-$ decay modes and the $\phi(1020)$ in the $K^+K^-$ decay mode. The decay $B_s^0 \to J/\psi\phi$ is used as a normalisation channel. Evidence is also reported for the decay $B_s^0 \to \eta_c\pi^+\pi^-$, where the $\eta_c$ meson is reconstructed in the $p\overline{p}$ decay mode, using the decay $B_s^0 \to J/\psi\pi^+\pi^-$ as a normalisation channel. The measured branching fractions are
$\mathcal{B}(B^0_s \to \eta_c\phi) = (5.01 \pm 0.53 \pm 0.27 \pm 0.63) \times 10^{−4}$,
$\mathcal{B}(B^0_s \to \eta_c\pi^+\pi^−) = (1.76 \pm 0.59 \pm 0.12 \pm 0.29) \times 10$^{−4}$,
where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:08 Feb 2018 10:23
Last Modified:19 Feb 2018 10:45
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP07(2017)021

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