Observation of $B^{+}\to p\bar{\Lambda }{K}^{+}{K}^{-}$ and $B^{+}\to \bar{p}\Lambda K^{+}{K}^{+}$

Abstract

We report the study of \OK \ and \SK \ using a $772\times 10^6$ $B\bar{B}$ pair data sample recorded on the ${\rm Y}(4S)$ resonance with the Belle detector at KEKB. The following branching fractions are measured: $\mathcal{B}$(\OKPHSP) $=$ $(4.22_{-0.44}^{+0.45}\pm 0.51)\times 10^{-6}$, $\mathcal{B}$(\SKPHSP) $=$ $(3.81_{-0.37}^{+0.39}\pm 0.45)\times 10^{-6}$, $\mathcal{B}$(\ETACD+c.c.) $=$ $(2.91_{-0.35}^{+0.37}\pm 0.36)\times 10^{-3}$ and $\mathcal{B}$(\PLPHI) $=$ $(8.18\pm 2.15\pm 0.79)\times 10^{-7}$, where c.c. denotes the corresponding charge-conjugation process. The intermediate resonance decays are excluded in the four-body decay measurements. We also found evidences for $\mathcal{B}$(\ETACS+c.c.) $=$ $(3.59\pm 1.52\pm 0.47)\times 10^{-3}$ and $\mathcal{B}$(\LLKO) $=$ $(2.30\pm 0.65\pm 0.25)\times 10^{-6}$. No significant signals are found for \JPSIS+c.c. and \LLKS \ ; we set the 90\% confidence level upper limits on their decay branching fractions as $<1.85\times 10^{-3}$ and $<2.14\times 10^{-6}$, respectively.

arXiv comment20 pages, 7 figures, 3 tables Submitted to Phys. Rev. D

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