Measurement of the CP violating phase φs in B-s0→J/ψf0(980)

The LHCb Collaboration

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Measurement of mixing-induced CP violation in B-s0 decays is of prime importance in probing new physics. So far only the channel B-s0→J/ψφ has been used. Here we report on a measurement using an LHCb data sample of 0.41 fb-1, in the CP odd eigenstate J/ψf0(980), where f0(980)→π+π-. A time-dependent fit of the data with the B-s0 lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from B-s0→J/ψφ yields a value of the CP violating phase of -0.44±0.44±0.02 rad, consistent with the Standard Model expectation.

Original languageEnglish
Pages (from-to)497-505
Number of pages9
JournalPhysics Letters B
Issue number5
Publication statusPublished - 7 Feb 2012
Externally publishedYes


  • CP violation
  • Hadronic B decays
  • LHC

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