22-29 July 2015
Europe/Vienna timezone

Recent results on exotic quarkonium states from Belle

Jul 23, 2015, 9:45 AM
talk QCD and Hadronic Physics QCD and Hadronic Physics


Alexei Garmash (Princeton)


Recent observations of charged charmonium-like states have opened an interesting landscape in the field of hadron spectroscopy. Continuing with its tradition, Belle recently observed a new charged charmonium-like state Zc(4200) and obtained an evidence for Zc(4430) → J/ψπ+ in B → J/ψπK decays. Belle also found the first evidence for a new charged state Zc(4020)+ in their updated study of ISR decay, e+e− → ππψ(2S). Along with this, we also present the first observation of B0 → X(3872)K+π− decay mode, the search for X(3872)/χc1(2P) in B+ → χc1π+π−K+, and the search for X(3872)-like states, Zc(3900)0, X(3915) and Zc(4020)0 in the final states with ηc meson in the B decays. We also report recent results on the spectroscopy of charged and vector bottomonium-like states at Belle. These include new decay channels of the Zb bottomonium-like resonances in the dataset taken at the Υ(10860), studies of resonant substructure in three-body decays at the Υ(11020), and the observation of η transitions from Υ(4S) and Υ(10860) to Υ(1S,2S) and hb(1P,2P) states, as well as Υ(10860) → η/π+π−Υ(1D). We also investigate the dependence of production rates on the center-of-mass energy in the regions of Υ(10860) and Υ(11020) for several types of b ̄b events, both with bottomonia and open-b states, and consider the implications for the masses and widths of Υ(10860) and Υ(11020).

additional information

Submitted on behalf of the Belle collaboration.
Actual presenter will be selected by the Belle collaboration at a later time.

Primary author

Youngjoon Kwon (Yonsei University)

Presentation materials