Branching Fractions for psi(2S) to J/psi Transitions

TL;DR

This paper reports precise measurements of the branching fractions for Psi(2S) transitions to J/Psi, including both inclusive and exclusive modes, using e+e- collision data from the CLEO detector.

Contribution

It provides the most precise or first direct measurements of these branching fractions and ratios, enhancing understanding of Psi(2S) to J/Psi transitions.

Findings

Most precise measurements to date of branching fractions

First direct measurements of certain transition ratios

Determination of B(ChicJ --> gamma J/Psi) and B(Psi(2S) --> light hadrons)

Abstract

We describe new measurements of the inclusive and exclusive branching fractions for Psi(2S) transitions to J/Psi using e+e- collision data collected with the CLEO detector operating at CESR. All branching fractions and ratios of branching fractions reported here represent either the most precise measurements to date or the first direct measurements. Indirectly and in combination with other CLEO measurements, we determine B(ChicJ --> gamma J/Psi) and B(Psi(2S) --> light hadrons).