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

Abstract

We present evidence for the exotic charged charmoniumlike state $Z_{c}^{\pm}(3900)$ decaying to J/ψπ$^{\pm}$ in semi-inclusive weak decays of $b$-flavored hadrons. The signal is correlated with a parent J/ψπ$^+$π$^−$ system in the invariant-mass range 4.2–4.7 GeV that would include the exotic structure $Y(4260)$. The study is based on 10.4fb$^{−1}$ of $p\overline{p}$ collision data collected by the D0 experiment at the Fermilab Tevatron collider.