## First observation of Bs→J/ψf0(980) decays.

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• The LHCb Collaboration

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Original language English Physics Letters B https://doi.org/10.1016/j.physletb.2011.03.006 Published - 2 Feb 2011

### Abstract

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the hadronic decay Bs→J/ψf0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the Bs system. Using a fit to the \pi+^ \pi^- mass spectrum with interfering resonances gives Rf0/ϕ=[Γ(Bs→J/ψf0,f0→π+π−)]/[Γ(Bs→J/ψϕ,ϕ→K+K−)]=0.252+0.046+0.027−0.032−0.033, where the uncertainties are statistical and systematic, respectively.

ID: 1286042