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Observation of $D^0$ meson decays to $\pi^+\pi^-\mu^+\mu^-$ and $K^+K^-\mu^+\mu^-$ final states


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). Observation of $D^0$ meson decays to $\pi^+\pi^-\mu^+\mu^-$ and $K^+K^-\mu^+\mu^-$ final states. Physical Review Letters, 119(18):181805.

Abstract

The first observation of the $D^0 \to \pi^+\pi^-\mu^+\mu^-$ and $D^0 \to K^+K^-\mu^+\mu^-$ decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-mass energy of 8 TeV, and corresponding to 2  fb$^{−1}$ of integrated luminosity. The corresponding branching fractions are measured using as normalization the decay $D^0 \to K^−\pi^+[\mu^+\mu^−]_{\rho^0 / \omega}$, where the two muons are consistent with coming from the decay of a ${\rho}^0$ or $\omega$ meson. The results are
$\mathscr{B}(D^0 \to \pi^+\pi^−\mu^+\mu^−) = (9.64 \pm 0.48 \pm 0.51 \pm 0.97) \times 10^{−7}$ and
$\mathscr{B}(D^0 \to K^+K^−\mu^+\mu^−) = (1.54 \pm 0.27\pm 0.09 \pm 0.16) \times 10^{−7}$, where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalization branching fraction. The dependence of the branching fraction on the dimuon mass is also investigated.

Abstract

The first observation of the $D^0 \to \pi^+\pi^-\mu^+\mu^-$ and $D^0 \to K^+K^-\mu^+\mu^-$ decays is reported using a sample of proton-proton collisions collected by LHCb at a center-of-mass energy of 8 TeV, and corresponding to 2  fb$^{−1}$ of integrated luminosity. The corresponding branching fractions are measured using as normalization the decay $D^0 \to K^−\pi^+[\mu^+\mu^−]_{\rho^0 / \omega}$, where the two muons are consistent with coming from the decay of a ${\rho}^0$ or $\omega$ meson. The results are
$\mathscr{B}(D^0 \to \pi^+\pi^−\mu^+\mu^−) = (9.64 \pm 0.48 \pm 0.51 \pm 0.97) \times 10^{−7}$ and
$\mathscr{B}(D^0 \to K^+K^−\mu^+\mu^−) = (1.54 \pm 0.27\pm 0.09 \pm 0.16) \times 10^{−7}$, where the uncertainties are statistical, systematic, and due to the limited knowledge of the normalization branching fraction. The dependence of the branching fraction on the dimuon mass is also investigated.

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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:06 Feb 2018 15:52
Last Modified:19 Feb 2018 10:45
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/PhysRevLett.119.181805

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