Measurements of the Mass, total Width and Two-Photon Partila Width of the $η_{c}$ Meson

Details Measurements of the Mass, total Width and Two-Photon Partila Width of the $η_{c}$ Meson Measurements of the Mass, total Width and Two-Photon Partila Width of the $η_{c}$ Meson

2000-06-21

arxiv.org/abs/hep-ex/0006026v2

Phys.Rev.Lett.85:3095-3099,2000

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevLett.85.3095

Using 13.4 $fb^{-1}$ of data collected with the CLEO detector at the Cornell Electron Storage Ring, we have observed 300 events for the two-photon production of ground-state pseudo-scalar charmonium in the decay $\eta_c$ -> $K_S K^{\mp} \pi^{\pm}$. We have measured the $\eta_c$ mass to be (2980.4 +- 2.3 (stat) +- 0.6 (sys)) MeV and its full width as (27.0 +- 5.8 (stat) +- 1.4 (sys)) MeV. We have determined the two-photon partial width of the $\eta_c$ meson to be (7.6 +- 0.8 (stat) +- 0.4 (sys) +- 2.3 (br)) keV, with the last uncertainty associated with the decay branching fraction.

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