Edinburgh Research Explorer

Measurement of the CP-violating phase φs from B0sJ/ψπ+π- decays in 13 TeV pp collisions

Research output: Contribution to journalArticle

Original languageEnglish
Article number134789
JournalPhysics Letters B
Early online date18 Jul 2019
Publication statusPublished - 10 Oct 2019


Decays of Bs0 and B‾0s mesons into J/ψπ+π− final states are studied in a data sample corresponding to 1.9 fb −1 of integrated luminosity collected with the LHCb detector in 13 TeV pp collisions. A time-dependent amplitude analysis is used to determine the final-state resonance contributions, the CP -violating phase ϕs=−0.057±0.060±0.011 rad, the decay-width difference between the heavier mass Bs0 eigenstate and the B0 meson of −0.050±0.004±0.004 ps −1 , and the CP -violating parameter |λ|=1.01−0.06+0.08±0.03 , where the first uncertainty is statistical and the second systematic. These results are combined with previous LHCb measurements in the same decay channel using 7 TeV and 8 TeV pp collisions obtaining ϕs=0.002±0.044±0.012 rad, and |λ|=0.949±0.036±0.019 .

ID: 155214216