Search for f_J(2220) in radiative J/psi decays

TL;DR

This study searches for the f_J(2220) resonance in radiative J/psi decays using BABAR data but finds no evidence, setting upper limits that challenge previous reports of its existence.

Contribution

The paper provides the first search for f_J(2220) in radiative J/psi decays with a large dataset and sets stringent upper limits on its production, questioning earlier claims.

Findings

No evidence of f_J(2220) observed.

Upper limits on branching fractions are below previous measurements.

Results challenge earlier observations of the resonance.

Abstract

We present a search for f_J(2220) production in radiative J/psi -> gamma f_J(2220) decays using 460 fb-1 of data collected with the BABAR detector at the SLAC PEP-II e+e- collider. The f_J(2220) is searched for in the decays to K+K- and KsKs. No evidence of this resonance is observed, and 90% confidence level upper limits on the product of the branching fractions for J/psi -> gamma f_J(2220), f_J(2220) -> K+K- and J/psi -> gamma f_J(2220), f_J(2220) -> KsKs as a function of spin and helicity are set at the level of 10-5. These values are below the central values reported by the Mark III experiment.