CMS-PAS-BPH-18-004

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.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to EPJC. The superseded preliminary plots can be found here.

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	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.
png pdf	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
png pdf	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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