Search for X(3872) in gamma gamma Fusion and ISR at CLEO
Abstract
We report on a search for the X(3872) state using 15.1 fb-1 of e+ e- annihilation data taken with the CLEO III detector in the sqrts = 9.46-11.30 GeV region. Separate searches for the production of X(3872) in untagged gamma gamma fusion and e+ e- annihilation following initial state radiation are made by taking advantage of the unique correlation of J/psi -> l+ l- in X(3872) decay into J/psi pi+ pi-. No signals are observed in either case, and 90% confidence upper limits are established as (2J+1)Gammagammagamma(X(3872))B(X -> J/psi pi+ pi-) < 12.9 eV and Gammaee(X(3872))B(X -> J/psi pi+ pi-) < 8.3 eV.
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