# How much does $b_1^-$ meson's mass differ from that of $b_1^0$?

How much does $$b_1^-$$ meson's mass differ from that of $$b_1^0$$? From reading http://pdglive.lbl.gov/Particle.action?node=M011, it is not very clear.

• I don't think the measurements are precise enough to answer that question. It should be ~MeV. – dukwon Dec 28 '18 at 14:53