Evidence for $Z_c^{\pm }(3900)$ in semi-inclusive decays of $b$-flavored hadrons

D0 Collaboration

We present evidence for the exotic charged charmonium-like state $Z_c^{\pm }(3900)$ in semi-inclusive weak decays of $b$-flavored hadrons. The signal is correlated with a $J/ψπ^+ π^…