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Observation of the $B^{0}_{s}\rightarrow J/\psi K_{{\rm S}}^{0} K^{\pm} \pi^{\mp}$ decay

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Abstract

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.

Figures and captions

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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B2JpsiKShh-Stripping17b_LL_massplot_dcb_MCopt_pid.pdf
B2Jpsi[..].pdf [20 KiB]
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B2JpsiKShh-Stripping17b_DD_massplot_dcb_MCopt_pid.pdf

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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B2JpsiKS-Stripping17b_LL_massplot_dcb_MCopt.pdf
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B2JpsiKS-Stripping17b_DD_massplot_dcb_MCopt.pdf

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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B2JpsiKShh-Stripping17b_LL_psi2Jpsipipi_massplot_dcb_MCopt_pid.pdf
B2Jpsi[..].pdf [18 KiB]
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B2JpsiKShh-Stripping17b_DD_psi2Jpsipipi_massplot_dcb_MCopt_pid.pdf

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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cBmass_JpsiKSpipi_LLdata2011-crop-All-bdtBRfixSlopes-paper.pdf
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cBmass_JpsiKSpipi_DDdata2011-crop-All-bdtBRfixSlopes-paper.pdf
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cBmass_JpsiKSpipi_LLdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf
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cBmass_JpsiKSpipi_DDdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf

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.

cBmass[..].pdf [20 KiB]
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cBmass_JpsiKSKpi_LLdata2011-crop-All-bdtBRfixSlopes-paper.pdf
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cBmass_JpsiKSKpi_DDdata2011-crop-All-bdtBRfixSlopes-paper.pdf
cBmass[..].pdf [19 KiB]
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cBmass_JpsiKSKpi_LLdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf
cBmass[..].pdf [20 KiB]
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cBmass_JpsiKSKpi_DDdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf

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.

cBmass[..].pdf [19 KiB]
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cBmass_JpsiKSKK_LLdata2011-crop-All-bdtBRfixSlopes-paper.pdf
cBmass[..].pdf [19 KiB]
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cBmass_JpsiKSKK_DDdata2011-crop-All-bdtBRfixSlopes-paper.pdf
cBmass[..].pdf [19 KiB]
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cBmass_JpsiKSKK_LLdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf
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cBmass_JpsiKSKK_DDdata2011-crop-All-bdtBRfixSlopes-paper_log.pdf

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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Combined_TwoBodyInvarMass_Bdpipi_DDh13h.pdf
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Combined_TwoBodyInvarMass_Bdpipi_DDh14h.pdf

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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Both_ThreeBodyInvarMass_Bdpipi_DDh123h.pdf
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Both_ThreeBodyInvarMass_Bdpipi_DDh124h.pdf
Combin[..].pdf [19 KiB]
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Combined_ThreeBodyInvarMass_Bdpipi_DDh134h.pdf

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.

Both_T[..].pdf [17 KiB]
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Both_TwoBodyInvarMass_BsKpi_DDh12h.pdf
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Both_TwoBodyInvarMass_BsKpi_DDh34h.pdf
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Both_TwoBodyInvarMass_BsKpi_DDh13h.pdf
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Both_TwoBodyInvarMass_BsKpi_DDh24h.pdf

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.

Both_T[..].pdf [18 KiB]
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Both_ThreeBodyInvarMass_BsKpi_DDh123h.pdf
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Both_ThreeBodyInvarMass_BsKpi_DDh124h.pdf
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Both_ThreeBodyInvarMass_BsKpi_DDh134h.pdf
Both_T[..].pdf [18 KiB]
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Both_ThreeBodyInvarMass_BsKpi_DDh234h.pdf

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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Both_TwoBodyInvarMass_BdKK_DDh12h.pdf
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Both_TwoBodyInvarMass_BdKK_DDh34h.pdf
Combin[..].pdf [17 KiB]
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Combined_TwoBodyInvarMass_BdKK_DDh13h.pdf
Combin[..].pdf [17 KiB]
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Combined_TwoBodyInvarMass_BdKK_DDh14h.pdf

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.

Both_T[..].pdf [17 KiB]
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Both_ThreeBodyInvarMass_BdKK_DDh123h.pdf
Both_T[..].pdf [17 KiB]
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Both_ThreeBodyInvarMass_BdKK_DDh124h.pdf
Combin[..].pdf [17 KiB]
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Combined_ThreeBodyInvarMass_BdKK_DDh134h.pdf

Animated gif made out of all figures.

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Tables and captions

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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Table_1.pdf

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.

Table_2.pdf [79 KiB]
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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.

Table_3.pdf [68 KiB]
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Table_3.pdf

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 09 December 2018.Citation count from INSPIRE on 09 December 2018.