Recent bottomonium studies at Belle

11th International Conference on Hyperons, Charm and Beauty Hadrons

He, Xionghong^1

Peking University, China^1

关键词: Belle detectors;    Bottomonium;    Data sample;    Final state;    Invariant mass distribution;    Mass regions;    Omega events;    Resonance parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/556/1/012014/pdf
DOI  :  10.1088/1742-6596/556/1/012014

来源: IOP

【 摘 要 】

We report the recent studies of bottomonium spectroscopy and transitions using the data sample collected with the Belle detector. Unambiguous π+π-π0χb1(J = 1, 2), ωχb1signals are observed near the Υ(5S) resonance mass region. In the invariant mass distribution, some (π+π-π0)non-ωevents are observed besides clear ω signal events. A X(3872)- like state in bottom sector is searched for in the final state ωΥ(1S). The Belle collaboration also searches for the η transitions with the Υ(4S) and Υ(5S) data samples. The Υ(4S) → ηhb(1P) process is observed and evidences of η transitions from Υ(5S) to lower bottomonium are found. The ηb(1S) resonance parameters are updated based on the decay mode hb(1P) → γηb(1S) in the same work.