Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV
| dc.citation.articleNumber | 136188 | |
| dc.citation.journalTitle | Physics Letters B | |
| dc.citation.volumeNumber | 816 | |
| dc.contributor.author | The CMS Collaboration | |
| dc.date.accessioned | 2021-04-21T15:46:08Z | |
| dc.date.available | 2021-04-21T15:46:08Z | |
| dc.date.issued | 2021 | |
| dc.description.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 48500reconstructed Bs0→J/ψϕ(1020)→μ+μ−K+K− events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1, collected in proton-proton collisions at s=13TeV 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=8TeV, 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. | |
| dc.identifier.citation | The CMS Collaboration. "Measurement of the CP-violating phase ϕs in the Bs0→J/ψϕ(1020)→μ+μ−K+K− channel in proton-proton collisions at s=13TeV." <i>Physics Letters B,</i> 816, (2021) Elsevier: https://doi.org/10.1016/j.physletb.2021.136188. | |
| dc.identifier.digital | 1-s2-0-S0370269321001283-main | |
| dc.identifier.doi | https://doi.org/10.1016/j.physletb.2021.136188 | |
| dc.identifier.uri | https://hdl.handle.net/1911/110286 | |
| dc.language.iso | eng | |
| dc.publisher | Elsevier | |
| dc.rights | This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). | |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/). | |
| dc.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=13TeV | |
| dc.type | Journal article | |
| dc.type.dcmi | Text | |
| dc.type.publication | publisher version |
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