Measurement of the CP-violating phase βin B0→J/Ψπ+π-decays and limits on penguin effects

LHCb Collaboration

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

Time-dependent CPviolation is measured in the B0→J/Ψπ+π-channel for each π+π-resonant final state using data collected with an integrated luminosity of 3.0fb-1in ppcollisions using the LHCb detector. The final state with the largest rate, J/Ψρ0(770), is used to measure the CP-violating angle 2βeffto be (41.7 ±9.6+2.8 -6.3)°. This result can be used to limit the size of penguin amplitude contributions to CPviolation measurements in, for example, B0 s→J/Ψϕdecays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕsis limited to be within the interval [-1.05°, +1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.

Original languageEnglish (US)
Pages (from-to)38-49
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume742
Issue number1
DOIs
StatePublished - Jan 1 2015

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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