We report the study of $B^{+}\to p\overline{\mathrm{\Lambda }}{K}^{+}{K}^{-}$ and $B^{+}\to \overline{p}\mathrm{\Lambda }{K}^{+}{K}^{+}$ decays using a $772\times {10}^{6}B\overline{B}$ pair data sample recorded on the $\mathrm{\Upsilon }(4S)$ resonance with the Belle detector at KEKB. The following branching fractions are measured: $\mathcal{B}(B^{+}\to p\overline{\mathrm{\Lambda }}{K}^{+}{K}^{-})=(4.10_{-0.43}^{+0.45}\pm 0.50)\times {10}^{-6}$, $\mathcal{B}(B^{+}\to \overline{p}\mathrm{\Lambda }{K}^{+}{K}^{+})=(3.70_{-0.37}^{+0.39}\pm 0.44)\times {10}^{-6}$, $\mathcal{B}({\eta }_c\to p\overline{\mathrm{\Lambda }}{K}^{-}+\mathrm{c}.\mathrm{c}.)=({2.83}_{-0.34}^{+0.36}\pm 0.35)\times {10}^{-3}$ and $\mathcal{B}(B^{+}\to p\overline{\mathrm{\Lambda }}\varphi )=(7.95\pm 2.09\pm 0.77)\times {10}^{-7}$, where c.c. denotes the corresponding charge-conjugation process. The intermediate resonance decays are excluded in the four-body decay measurements. We also find evidence for $\mathcal{B}({\eta }_c\to \mathrm{\Lambda }(1520)\overline{\mathrm{\Lambda }}+\mathrm{c}.\mathrm{c}.)=(3.48\pm 1.48\pm 0.46)\times {10}^{-3}$ and $\mathcal{B}(B^{+}\to \mathrm{\Lambda }(1520)\overline{\mathrm{\Lambda }}{K}^{+})=(2.23\pm 0.63\pm 0.25)\times {10}^{-6}$. No significant signals are found for $J/\psi \to \mathrm{\Lambda }(1520)\overline{\mathrm{\Lambda }}+\mathrm{c}.\mathrm{c}.$ and $B^{+}\to \overline{\mathrm{\Lambda }}(1520)\mathrm{\Lambda }{K}^{+}$; we set the 90% confidence level upper limits on their decay branching fractions as $<1.80\times {10}^{-3}$ and $<2.08\times {10}^{-6}$, respectively.

• Received 27 July 2018

DOI:https://doi.org/10.1103/PhysRevD.99.032003

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Published by the American Physical Society