Decays of the form $B^{0}_{(s)}\rightarrow J/\psi K_{{\rm S}}^{0} h^+ h^{\left(\prime\right) -}$ ($h^{(\prime)} = K, \pi$) are searched for in proton-proton collision data corresponding to an integrated luminosity of $1.0 {\rm fb}^{-1}$ recorded with the LHCb detector. The first observation of the $B^{0}_{s}\rightarrow J/\psi K_{{\rm S}}^{0} K^{\pm} \pi^{\mp}$ decay is reported, with significance in excess of 10 standard deviations. The $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} K^{+} K^{-}$ decay is also observed for the first time. The branching fraction of $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} \pi^{+} \pi^{-}$ is determined, to significantly better precision than previous measurements, using $B^0 \rightarrow J/\psi K_{{\rm S}}^{0}$ as a normalisation channel. Branching fractions and upper limits of the other $B^{0}_{(s)}\rightarrow J/\psi K_{{\rm S}}^{0} h^+ h^{\left(\prime\right) -}$ modes are determined relative to that of the $B^{0}\rightarrow J/\psi K_{{\rm S}}^{0} \pi^{+} \pi^{-}$ decay.
Invariant mass distributions of (left) long and (right) downstream $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ candidates with simulation-based selection, with fit projections overlaid. The solid line shows the total fit result, while the dashed line shows the signal component and the dot-dashed line shows the combinatorial background. The $ B ^0_ s $ region is not examined in these fits. |
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Invariant mass distributions of (left) long and (right) downstream $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} $ candidates with simulation-based selection, with fit projections overlaid. The solid line shows the total fit result, while the dashed line shows the signal component and the dot-dashed line shows the combinatorial background. |
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Invariant mass distributions of (left) long and (right) downstream $ B ^0 \rightarrow \psi {(2S)} K ^0_{\rm\scriptscriptstyle S} $ candidates with simulation-based selection, with fit projections overlaid. The solid line shows the total fit result, while the dashed line shows the signal component and the dot-dashed line shows the combinatorial background. The $ B ^0_ s $ region is not examined in these fits. |
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Invariant mass distributions of (left) long and (right) downstream $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ candidates, with data-based selection, shown with (top) linear and (bottom) logarithmic $y$-axis scales, with fit projections overlaid. The solid line shows the total fit result, while the dashed and dotted lines show the $ B ^0$ and $ B ^0_ s $ signal components, respectively, and the dot-dashed line shows the combinatorial background. |
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Invariant mass distributions of (left) long and (right) downstream $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^\pm \pi ^\mp $ candidates, with data-based selection, shown with (top) linear and (bottom) logarithmic $y$-axis scales, with fit projections overlaid. The solid line shows the total fit result, while the dashed and dotted lines show the $ B ^0$ and $ B ^0_ s $ signal components, respectively, the long-dashed line shows the feed-across contribution and the dot-dashed line shows the combinatorial background. |
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Invariant mass distributions of (left) long and (right) downstream $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^+ K ^- $ candidates, with data-based selection, shown with (top) linear and (bottom) logarithmic $y$-axis scales, with fit projections overlaid. The solid line shows the total fit result, while the dashed and dotted lines show the $ B ^0$ and $ B ^0_ s $ signal components, respectively, and the dot-dashed line shows the combinatorial background. |
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Background-subtracted distributions of the possible two-body invariant mass combinations in $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ decays. Contributions from the $\rho(770)^0$ and $K^*(892)^\pm$ mesons are seen in the $m(\pi ^+ \pi ^- )$ and $m( K ^0_{\rm\scriptscriptstyle S} \pi ^\pm )$ distributions, respectively. |
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Background-subtracted distributions of the possible three-body invariant mass combinations in $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ decays. An enhancement from the $K_1(1400)$ state are seen in the $m( K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- )$ distribution. |
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Background-subtracted distributions of the possible two-body invariant mass combinations in $ B ^0_ s \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^\pm \pi ^\mp $ decays. Contributions from the $\optbar{ K}{} ^*(892)^0$ and $K^*(892)^\pm$ mesons are seen in the $m( K ^\pm \pi ^\mp )$ and $m( K ^0_{\rm\scriptscriptstyle S} \pi ^\pm )$ distributions, respectively. |
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Background-subtracted distributions of the possible three-body invariant mass combinations in $ B ^0_ s \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^\pm \pi ^\mp $ decays. No clear signatures of narrow resonances are observed. |
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Background-subtracted distributions of the possible two-body invariant mass combinations in $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^+ K ^- $ decays. The $\phi(1020)$ resonance is clearly seen in the $m( K ^+ K ^- )$ distribution. |
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Combin[..].pdf [17 KiB] HiDef png [107 KiB] Thumbnail [62 KiB] *.C file |
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Combin[..].pdf [17 KiB] HiDef png [108 KiB] Thumbnail [63 KiB] *.C file |
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Background-subtracted distributions of the possible three-body invariant mass combinations in $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^+ K ^- $ decays. No clear signatures of narrow resonances are observed. |
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Animated gif made out of all figures. |
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Yields determined from the fits to the $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ , $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} $ and $ B ^0_{( s )} \rightarrow \psi {(2S)} K ^0_{\rm\scriptscriptstyle S} $ samples with simulation-based selection. |
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Yields determined from the simultaneous fit to the $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ , $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^\pm \pi ^\mp $ and $ B ^0_{( s )} \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} K ^+ K ^- $ samples with data-based selection. |
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Systematic uncertainties (%) for the relative branching fraction measurements with $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} $ as normalisation channel, given separately for long and downstream categories. The total systematic uncertainty is the sum in quadrature of all contributions. |
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Systematic uncertainties (%) for the relative branching fraction measurements with $ B ^0 \rightarrow { J \mskip -3mu/\mskip -2mu\psi \mskip 2mu} K ^0_{\rm\scriptscriptstyle S} \pi ^+ \pi ^- $ as normalisation channel, given separately for long and downstream categories. The total systematic uncertainty is the sum in quadrature of all contributions. |
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Significances ($\sigma$) for previously unobserved channels obtained from the fits to the samples with data-based selection. The values quoted for long and downstream categories include only statistical effects, while the combined results include systematic uncertainties. |
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Created on 27 April 2024.