Observation of chi-b(1PJ,2PJ) decays to light hadrons

TL;DR

This study measures the decay rates of chi_b(1PJ,2PJ) to light hadrons via Upsilon decays, providing first-time product branching fractions and limits on specific E1 transitions using CLEO data.

Contribution

First measurement of product branching fractions for chi_b(1PJ,2PJ) decays to light hadrons in Upsilon decays, including new decay mode observations and transition limits.

Findings

Observed significant signals in 14 light-hadron final states.

Measured product branching fractions for n=2 and 3 states.

Set upper limits on certain E1 transition rates.

Abstract

Analyzing $\Upsilon(nS)$ decays acquired with the CLEO detector operating at the CESR $e^+e^-$ collider, we measure for the first time the product branching fractions ${\cal B}[\Upsilon(nS)\to\gamma\chi_{b}((n-1)P_J)] \times {\cal B}[\chi_{b}(n-1)P_J)\to X_i]$ for $n=2$ and 3, where $X_i$ denotes, for each $i$, one of the fourteen exclusive light-hadron final states for which we observe significant signals in both $\chi_b(1P_J)$ and $\chi_b(2P_J)$ decays. We also determine upper limits for the electric dipole (E1) transitions $\Upsilon(3S) \to \gamma \chi_b(1P_J)$.