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| Format: | Preprint |
| Published: |
2024
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| Online Access: | https://arxiv.org/abs/2412.19952 |
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| _version_ | 1866917467109982208 |
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| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27$\,$000 tagged B$^0_\mathrm{s}$ $\to$ J/$ψ\, ϕ$(1020) decays from pp collisions at $\sqrt{s}$ $=$ 13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 96.5 fb$^{-1}$. A time- and flavor-dependent angular analysis of the $μ^+μ^-$K$^+$K$^-$ final state, consistent with a $ϕ$(1020) $\to$ K$^+$K$^-$ decay, is used to measure parameters of the $\mathrm{B}^0_\mathrm{s}-\overline{\mathrm{B}}^0_\mathrm{s}$ system. The weak phase is measured to be $ϕ_\mathrm{s}$ = $-$73 $\pm$ 22 (stat) $\pm$ 10 (syst) mrad, which, combined with the $\sqrt{s}$ $=$ 8 TeV CMS result, gives $ϕ_\mathrm{s}$ = $-$75 $\pm$ 23 mrad. This value differs from zero by 3.2 standard deviations, providing the first evidence for mixing-induced $CP$ violation in B$^0_\mathrm{s}$ $\to$ J/$ψ\,ϕ$(1020) decays. All measured physics parameters are found to agree with standard model predictions where available. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_19952 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | First evidence for mixing-induced $CP$ violation in B$^0_\mathrm{s}$ $\to$ J/$ψ\,ϕ$(1020) decays in pp collisions at $\sqrt{s} = $ 13 TeV CMS Collaboration High Energy Physics - Experiment A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27$\,$000 tagged B$^0_\mathrm{s}$ $\to$ J/$ψ\, ϕ$(1020) decays from pp collisions at $\sqrt{s}$ $=$ 13 TeV, collected by the CMS experiment and corresponding to an integrated luminosity of 96.5 fb$^{-1}$. A time- and flavor-dependent angular analysis of the $μ^+μ^-$K$^+$K$^-$ final state, consistent with a $ϕ$(1020) $\to$ K$^+$K$^-$ decay, is used to measure parameters of the $\mathrm{B}^0_\mathrm{s}-\overline{\mathrm{B}}^0_\mathrm{s}$ system. The weak phase is measured to be $ϕ_\mathrm{s}$ = $-$73 $\pm$ 22 (stat) $\pm$ 10 (syst) mrad, which, combined with the $\sqrt{s}$ $=$ 8 TeV CMS result, gives $ϕ_\mathrm{s}$ = $-$75 $\pm$ 23 mrad. This value differs from zero by 3.2 standard deviations, providing the first evidence for mixing-induced $CP$ violation in B$^0_\mathrm{s}$ $\to$ J/$ψ\,ϕ$(1020) decays. All measured physics parameters are found to agree with standard model predictions where available. |
| title | First evidence for mixing-induced $CP$ violation in B$^0_\mathrm{s}$ $\to$ J/$ψ\,ϕ$(1020) decays in pp collisions at $\sqrt{s} = $ 13 TeV |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2412.19952 |