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.

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

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