The possible candidates of tetraquark : $Z_b(10610)$ and $Z_b(10650)$

Understand

Using the chromomagnetic interaction Hamiltonian with proper account for the SU(3) flavor symmetry breaking, we have performed a schematic study on the masses of $S-$wave heavy tetraquarks as $bq\bar{b}\bar{q}$ ($q$ denotes $u$, $d$, $s$ quark).

• It is found that the numeral results for $bu\bar{b}\bar{d}$ or $bd\bar{b}\bar{u}$ with $1^{+}$ quantum number are 10612 MeV and 10683 MeV respectively, which are well compatible with the recent detected charged bottomonium-like $Z_b(10610)$ and $Z_b(10650)$.
• Theoretically, we also investigate the possible tetraquark states of $1^{++}$ and $2^{+}$ due to the charge conjugation as the potential candidates for the updating experiments.