Search for X(3872) in Untagged gamma gamma Fusion and Initial State Radiation Production with CLEO III
Z. Metreveli, CLEO Collaboration
Abstract
We report on an exclusive search for the X(3872) state in the decay pi+ pi- J/psi, J/psi to l+ l- (l = e, mu) from untagged gamma-gamma fusion and initial state radiation production using a 15.1 fb-1 data sample with the CLEO III detector. By taking advantage of the unique pi+ pi- J/psi decay kinematics, separate measurements for each production process are obtained. No signals are observed and preliminary upper limits have been established as [(2J+1)*Widthgamgam(X(3872))*BR(X(3872) to pi+ pi- J/psi)] < 12.9 eV and [Widthee(X(3872))*BR(X(3872) to pi+ pi- J/psi)] < 8.0 eV, both at a 90% confidence level.
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