Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μK+K channel in proton-proton collisions at √s=13 TeV

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Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μK+K channel in proton-proton collisions at √s=13 TeV. / ATLAS Collaboration.

In: Phys. Lett. B, Vol. 816, 136188, 10.05.2021.

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@article{1b928a15f8f24dba88d795c53b57aa24,
title = "Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at √s=13 TeV",
abstract = "The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb-1, collected in proton-proton collisions at √s=13 TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs = -11 ± 50 (stat) ± 10 (syst) mrad and ΔΓs = 0.114 ± 0.014 (stat) ± 0.007 (syst) ps-1, in agreement with the standard model predictions. When combined with the previous CMS measurement at √s=8 TeV , the following values are obtained: ϕs = -21 ± 44 (stat) ± 10 (syst) mrad, ΔΓs = 0.1032 ± 0.0095 (stat) ± 0.0048 (syst) ps-1, a significant improvement over the 8 TeV result.",
keywords = "CMS, Physics, Oscillations, B physics",
author = "{ATLAS Collaboration} and Paul Newman",
note = "51 pages in total, author list starting page 35, 12 figures, 11 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2018-01/",
year = "2021",
month = may,
day = "10",
doi = "10.1016/j.physletb.2021.136188",
language = "English",
volume = "816",
journal = "Phys. Lett. B",

}

RIS

TY - JOUR

T1 - Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at √s=13 TeV

AU - ATLAS Collaboration

AU - Newman, Paul

N1 - 51 pages in total, author list starting page 35, 12 figures, 11 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2018-01/

PY - 2021/5/10

Y1 - 2021/5/10

N2 - The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb-1, collected in proton-proton collisions at √s=13 TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs = -11 ± 50 (stat) ± 10 (syst) mrad and ΔΓs = 0.114 ± 0.014 (stat) ± 0.007 (syst) ps-1, in agreement with the standard model predictions. When combined with the previous CMS measurement at √s=8 TeV , the following values are obtained: ϕs = -21 ± 44 (stat) ± 10 (syst) mrad, ΔΓs = 0.1032 ± 0.0095 (stat) ± 0.0048 (syst) ps-1, a significant improvement over the 8 TeV result.

AB - The CP -violating weak phase ϕs and the decay width difference ΔΓs between the light and heavy Bs0 mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb-1, collected in proton-proton collisions at √s=13 TeV in 2017–2018. To extract the values of ϕs and ΔΓs, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K− final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields ϕs = -11 ± 50 (stat) ± 10 (syst) mrad and ΔΓs = 0.114 ± 0.014 (stat) ± 0.007 (syst) ps-1, in agreement with the standard model predictions. When combined with the previous CMS measurement at √s=8 TeV , the following values are obtained: ϕs = -21 ± 44 (stat) ± 10 (syst) mrad, ΔΓs = 0.1032 ± 0.0095 (stat) ± 0.0048 (syst) ps-1, a significant improvement over the 8 TeV result.

KW - CMS

KW - Physics

KW - Oscillations

KW - B physics

U2 - 10.1016/j.physletb.2021.136188

DO - 10.1016/j.physletb.2021.136188

M3 - Article

VL - 816

JO - Phys. Lett. B

JF - Phys. Lett. B

M1 - 136188

ER -