Study of Transitions and Decays of Bottomonia at Belle

TL;DR

This paper reviews bottomonium transitions and decays studied at Belle, reports new measurements of branching fractions, and sets an upper limit on the 0(1P) width, advancing understanding of bottomonium properties.

Contribution

It provides new measurements of J(1P) decay branching fractions and establishes the first upper limit on the 0(1P) width, based on Belle data.

Findings

Branching fractions of J(1P) to 41 hadronic final states measured.

First upper limit set on 0(1P) total width (0(1P) 0 < 2.4 MeV).

Comprehensive review of bottomonium transitions at Belle.

Abstract

We review the studies of transitions and decays of bottomonium states from the e+ e- data recorded by the Belle detector at various Upsilon-resonances. We also report a recent study of the branching fractions of \chi_{bJ}(1P) to 41 hadronic final states in the Y(2S) data sample. In the same study, a 90% confidence-level upper limit is set for the first time on the width of \chi_{b0}(1P) at \Gamma_{total} < 2.4 MeV.