Measurement of the CP violating phase phi_s in B^0_s –> J/psi f_0(980)

The LHCb Collaboration, Matthew Needham, Franz Muheim, Peter Clarke, Yuehong Xie, Stephan Eisenhardt

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Measurement of mixing-induced CP violation in Bs decays is of prime importance in probing new physics. So far only the channel Bs->J/\psi \phi\ has been used. Here we report on a measurement using an LHCb data sample of 0.41/fb in the CP odd eigenstate J\psi f0(980), where f0(980)->\pi+ \pi-. A time dependent fit of the data with the Bs lifetime and the difference in widths of the heavy and light eigenstates constrained to the values obtained from Bs-> J/\psi\phi\ 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
Early online date13 Dec 2011
Publication statusPublished - 7 Feb 2012

Keywords / Materials (for Non-textual outputs)

  • LHC
  • CP violation
  • Hadronic B decays
  • meson


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