Spectroscopic parameters and decays of the resonance Zb(10610)

Abstract

The resonance Zb(10610) is investigated as the diquark–antidiquark Zb= [ bu] [ bd¯ ] state with spin–parity JP= 1 +. The mass and current coupling of the resonance Zb(10610) are evaluated using QCD two-point sum rule and taking into account the vacuum condensates up to ten dimensions. We study the vertices ZbΥ(nS)π(n=1,2,3) by applying the QCD light-cone sum rule to compute the corresponding strong couplings gZbΥ(nS)π and widths of the decays Zb→ Υ (nS) π. We explore also the vertices Zbhb(mP)π(m=1,2) and calculate the couplings gZbhb(mP)π and the widths of the decay channels Zb→ hb(mP) π. To this end, we calculate the mass and decay constants of the hb(1 P) and hb(2 P) mesons. The results obtained are compared with experimental data of the Belle Collaboration.