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| CMS-PAS-BPH-18-004 | ||
| Observation of $\mathrm{B}^0\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}\pi^+\pi^-$ and $\mathrm{B}^0_{\mathrm s}\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}$ decays | ||
| CMS Collaboration | ||
| July 2021 | ||
| Abstract: Using a data sample corresponding to an integrated luminosity of 103.7 fb$^{-1}$ of pp collisions, collected by the CMS experiment at $\sqrt{s}= $ 13 TeV in 2017 - 2018, the $\mathrm{B}^0\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}\pi^+\pi^-$ and $\mathrm{B}^0_{\rm s}\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}$ decays are observed. Measurements of their branching fractions, relative to the $\mathrm{B}^0\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}$ decay, are reported. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}$ (left) and ${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+ {\pi} ^-}$ (right) invariant mass distributions observed in data. The green long-dashed line shows the ${{\mathrm {B}} ^0}$ signal, the blue solid line indicates the combinatorial background. The pink dashed line on the left figure shows the ${{{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}}$ signal, and the pink dash-dotted line on the right figure shows the contribution from the $ {{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {\mathrm{K}} ^\pm {\pi} ^\mp $ decay, where the charged kaon was reconstructed as a pion. |
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Figure 1-a:
${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}$ (left) and ${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+ {\pi} ^-}$ (right) invariant mass distributions observed in data. The green long-dashed line shows the ${{\mathrm {B}} ^0}$ signal, the blue solid line indicates the combinatorial background. The pink dashed line on the left figure shows the ${{{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}}$ signal, and the pink dash-dotted line on the right figure shows the contribution from the $ {{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {\mathrm{K}} ^\pm {\pi} ^\mp $ decay, where the charged kaon was reconstructed as a pion. |
png pdf |
Figure 1-b:
${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}$ (left) and ${\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+ {\pi} ^-}$ (right) invariant mass distributions observed in data. The green long-dashed line shows the ${{\mathrm {B}} ^0}$ signal, the blue solid line indicates the combinatorial background. The pink dashed line on the left figure shows the ${{{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}}}$ signal, and the pink dash-dotted line on the right figure shows the contribution from the $ {{\mathrm {B}} ^0_ {\mathrm {s}}} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {\mathrm{K}} ^\pm {\pi} ^\mp $ decay, where the charged kaon was reconstructed as a pion. |
png pdf |
Figure 2:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-a:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-b:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-c:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-d:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-e:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 2-f:
Distributions of 2-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 3:
Distributions of 3-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 3-a:
Distributions of 3-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 3-b:
Distributions of 3-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 3-c:
Distributions of 3-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
png pdf |
Figure 3-d:
Distributions of 3-body intermediate invariant masses from the ${{{\mathrm {B}} ^0} \to {\psi (2\mathrm {S})} {{\mathrm{K}} ^0_{\rm \scriptscriptstyle S}} {{\pi} ^+} {{\pi} ^-}}$ decay. Data distributions are background-subtracted, for MC only the statistical uncertainties are shown. |
| Tables | |
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Table 1:
Systematic uncertainties (in %) of the measured branching fraction ratios |
| Summary |
| The $\mathrm{B}^0_{\mathrm s}\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}$ and $\mathrm{B}^0\to\psi\mathrm{(2S)}\mathrm{K}^0_{\mathrm S}\pi^+\pi^-$ decays are observed using 103.7 fb$^{-1}$ of 13 TeV pp collision data collected with the CMS experiment. |
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