Measurement of the CP-violating phase ϕs from Bs0→J/ψπ+π decays in 13 TeV pp collisions

LHCb Collaboration

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12 Citations (Scopus)
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Abstract

Decays of Bs0 and B̅smesons 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.

Original languageEnglish
Article number134789
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume797
Early online date18 Jul 2019
DOIs
Publication statusPublished - 10 Oct 2019

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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