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The observation of the $Y(4140)$ structure in $B^\pm\rightarrow J/\psi\,\phi K^\pm$ decays produced in $\bar{p} p $ collisions at $\sqrt{s}=1.96~\TeV$ is reported with a statistical significance greater than 5 standard deviations.
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We use a coordinate system in which the proton beam direction is defined as the z z axis. The angle θ \theta is the usual polar angle. We define the pseudorapidity as η ≡ − ln ( tan θ 2 ) \eta\equiv-\ln(\tan\frac{\theta}{2}) . The transverse momentum is defined as p T = p sin θ p_{T}=p\sin\theta , where p p is the momentum measured in the tracking system
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d N d m ∝ m Γ ( m ) ( m 2 − m 0 2 ) 2 + m 0 2 Γ 2 ( m ) \frac{dN}{dm}\propto\frac{m\Gamma(m)}{(m^{2}-m_{0}^{2})^{2}+m_{0}^{2}\Gamma^{2}(m)} , where Γ ( m ) = Γ 0 q q 0 m 0 m \Gamma(m)=\Gamma_{0}\frac{q}{q_{0}}\frac{m_{0}}{m} , q q is the daughter momentum in the mother rest frame, and the 0 subscript indicates the value at the pole mass
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