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Measurement of branching fraction and direct $CP$ asymmetry in charmless $B^+ \to K^+K^- \pi^+$ decays at Belle
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abstract
We report a study of the charmless hadronic decay of the charged $B$ meson to the three-body final state $K^+ K^- \pi^+$. The results are based on a data sample that contains $772\times10^6$ $B \bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The measured inclusive branching fraction and the direct $CP$ asymmetry are $(5.38\pm0.40\pm0.35)\times 10^{-6}$ and $-0.170\pm0.073\pm0.017$, respectively, where the first uncertainties are statistical and the second are systematic. The $K^{+}K^{-}$ invariant mass distribution of the signal candidates shows an excess in the region below $1.5$ GeV/$c^2$, which is consistent with the previous studies from BaBar and LHCb. In addition, strong evidence of a large direct $CP$ asymmetry is found in the $K^{+}K^{-}$ low-invariant-mass region.
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Cited by 1 Pith paper
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Quasi-Two-Body $B\to P (K^+K^-, \pi^+\pi^-)$ Decays with $f_0(980)$ Resonance
PQCD predictions for quasi-two-body B -> P f0(980) -> P(K+K-, π+π-) decays, with two-body B -> P f0(980) branching fractions extracted from the pion mode.
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