Mass and decay constant of the recently observed bound statehb(1P)

Abstract

The mass and decay constant of the ground state of spin-singlet $b\overline{b}$ is calculated by using the QCD sum rules method. This meson is an axial vector $P$ wave named ${h}_{b}(1P)$ meson with ${J}^{P}={1}^{+}$. It is found that the mass of this meson is $m=(9940\ifmmode\pm\else\textpm\fi{}37)\text{ }\text{ }\mathrm{MeV}$, which is consistent with the recent experimental data by the Belle Collaboration.