Recent Results in Bottomonium

TL;DR

This paper reviews recent advances in bottomonium physics, including new state discoveries, spectrum measurements, and insights into strong interactions and potential new physics signatures.

Contribution

It summarizes recent experimental discoveries of bottomonium states and discusses their implications for understanding strong interactions and potential new physics.

Findings

Discovery of $ exteta_b$ and $h_b$ states

Observation of first D-wave bottomonium states

Identification of candidates for $ ext{chi}_b(3P)$ excitations

Abstract

Great strides have been made in the understanding of bound states of a bottom quark $b$ and its antiquark $\bar b$ since the discovery of the first $\Upsilon$ resonances in 1977. These {\it bottomonium} bound states have a rich spectrum whose masses and transition amplitudes shed valuable light on the strong interactions. The present article reviews some recent developments in bottomonium physics. These include the discovery of the spin-singlet states $\eta_b$ and $h_b$, the first D-wave states, one or more candidates for spin-triplet $\chi_b(3P)$ excitations, and above-threshold states with strong transitions to states below threshold. Information on transitions, production, and signatures of new physics is also presented.