An improved limit for of and measurement of
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文摘
Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e+e→纬ISRX(3872)→纬ISR+J/蠄 via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1++ such as the X(3872) via single photon b48" title="Click to view the MathML source">e+e annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872), and therefore give an upper limit for the electronic width times the branching fraction b4f3">View the MathML source at the 90% confidence level. This measurement improves upon existing limits by a factor of 46. Using the same final state, we also measure the electronic width of the 3bb5bd75d754f998eb93229a778e1" title="Click to view the MathML source">蠄(3686) to be View the MathML source.

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