Search for the X(4140) state in B+ to J/psi phi K+ decays

Understand

A search for the X(4140) state in B+ to J/psi phi K+ decays is performed with 0.37 fb-1 of pp collisions at sqrt(s)=7 TeV collected by the LHCb experiment.

• No evidence for this state is found, in 2.4 sigma disagreement with a measurement by CDF.
• An upper limit on its production rate is set, BR(B+ to X(4140) K+) BR(X(4140) to J/psi phi) / BR(B+ to J/psi phi K+) < 0.07 at 90% confidence level.