Measurement of the CP-violating phase ϕs from Bs 0→J/ψπ+π decays in 13 TeV pp collisions

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  • Authors:
  • LHCb Collaboration


Decays of Bs 0 and B‾0 s 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 Bs 0 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.

Bibliographical metadata

Original languageEnglish
Article number134789
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Early online date18 Jul 2019
Publication statusPublished - 10 Oct 2019