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Search for X(3872) in gamma gamma Fusion and ISR at CLEO

Peter Zweber
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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 sqrt{s} = 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)Gamma_{gammagamma}(X(3872))B(X -> J/psi pi+ pi-) < 12.9 eV and Gamma_{ee}(X(3872))B(X -> J/psi pi+ pi-) < 8.3 eV.

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Peter Zweber. 2005-01-07. Search for X(3872) in gamma gamma Fusion and ISR at CLEO. https://doi.org/10.1088/1742-6596%2F9%2F1%2F011

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