We study the most recently observed excited Bc states with the Dyson-Schwinger equation and the Bethe-Salpeter equation approach of continuum QCD. The obtained MBc+(2S)=6.813(16)GeV, MBc∗+(2S)=6.841(18)GeV and the mass splitting MBc+(2S)−MBc∗+(2S)rec≈0.039GeV agree with the observations very well. Moreover we predict the leptonic decay constant fBc+(2S)=−0.165(10)GeV, fBc∗+(2S)=−0.161(7)GeV respectively.
@article{arxiv.1904.00399,
title = {Excited $B_{c}$ States via Continuum QCD},
author = {Lei Chang and Muyang Chen and Yu-xin Liu},
journal= {arXiv preprint arXiv:1904.00399},
year = {2020}
}