Investigating different structures of the Z_{b}(10610) and Z_{b}(10650)

Details Investigating different structures of the Z_{b}(10610) and Z_{b}(10650) Investigating different structures of the Z_{b}(10610) and Z_{b}(10650)

2011-07-07

arxiv.org/abs/1107.1343v3

Phys. Rev. D 85, 074014 (2012)

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 9 figures

Scientific paper

10.1103/PhysRevD.85.074014

The recently observed narrow resonance $Z_{b}(10610)$ is examined with the assumptions both as a $B^{*}\bar{B}$ molecular state and a $[bd][\bar{b}\bar{u}]$ tetraquark state with quantum numbers $I^{G}J^{P}=1^{+}1^{+}$. Possible interpolating currents are constructed to describe the $Z_{b}(10650)$ as an axial-vector $B^{*}\bar{B}^{*}$ molecular state or a $[bd][\bar{b}\bar{u}]$ tetraquark state. Using QCD sum rules (QCDSR), we consider contributions up to dimension six in the operator product expansion (OPE) at the leading order in $\alpha_{s}$. The mass is obtained as $(10.44\pm0.23) GeV$ for molecular state and $(10.50\pm0.19) GeV$ for tetraquark state, both of which coincide with the $Z_{b}(10610)$. The results $m_{B^{*}\bar{B}^{*}}=(10.45\pm0.31) GeV$ and $m_{[bd][\bar{b}\bar{u}]}=(10.48\pm0.33) GeV$ are consistent with the $Z_{b}(10650)$.

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