Determining the upper limit of Gamma_{ee} for the Y(4260)

Details Determining the upper limit of Gamma_{ee} for the Y(4260) Determining the upper limit of Gamma_{ee} for the Y(4260)

2006-03-13

arxiv.org/abs/hep-ex/0603024v2

Phys.Lett.B640:182-187,2006

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 4 figures

Scientific paper

10.1016/j.physletb.2006.07.060

By fitting the R values between 3.7 and 5.0 GeV measured by the BES collaboration, the upper limit of the electron width of the newly discovered resonance Y(4260) is determined to be 580 eV at 90% C.L. Together with the BABAR measurement on the product of Gamma_{ee} and BR(Y(4260) --> pi+pi- J/psi), this implies a large decay width of Y(4260) --> pi+pi- J/psi final states.

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