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Resonances and $CP$ violation in $B_s^0$ and $\overline{B}_s^0 \to J/\psi K^+K^-$ decays in the mass region above the $\phi(1020)$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Resonances and $CP$ violation in $B_s^0$ and $\overline{B}_s^0 \to J/\psi K^+K^-$ decays in the mass region above the $\phi(1020)$. Journal of High Energy Physics, 08:037.

Abstract

The decays of $B_s^0$ and $\overline{B}^0_s$ mesons into the $J/\psi K^+K^-$ final state are studied in the $K^+K^-$ mass region above the $\phi(1020)$ meson in order to determine the resonant substructure and measure the $CP$-violating phase, $\phi_s$ , the decay width, $\Gamma_s$ , and the width difference between light and heavy mass eigenstates, $\Delta\Gamma_s$. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of 3 fb$^{−1}$ produced in 7 and 8 TeV $pp$ collisions at the LHC, collected by the LHCb experiment. The measurement determines $\phi_s = 119 \pm 107 \pm 34$ mrad. A combination with previous LHCb measurements using similar decays into the $J/\psi\pi^+\pi^-$ and $J/\psi\phi(1020)$ final states gives $\phi_s = 1 \pm 37$ mrad, consistent with the Standard Model prediction.

Abstract

The decays of $B_s^0$ and $\overline{B}^0_s$ mesons into the $J/\psi K^+K^-$ final state are studied in the $K^+K^-$ mass region above the $\phi(1020)$ meson in order to determine the resonant substructure and measure the $CP$-violating phase, $\phi_s$ , the decay width, $\Gamma_s$ , and the width difference between light and heavy mass eigenstates, $\Delta\Gamma_s$. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of 3 fb$^{−1}$ produced in 7 and 8 TeV $pp$ collisions at the LHC, collected by the LHCb experiment. The measurement determines $\phi_s = 119 \pm 107 \pm 34$ mrad. A combination with previous LHCb measurements using similar decays into the $J/\psi\pi^+\pi^-$ and $J/\psi\phi(1020)$ final states gives $\phi_s = 1 \pm 37$ mrad, consistent with the Standard Model prediction.

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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 15:48
Last Modified:19 Feb 2018 10:44
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/JHEP08(2017)037

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