Measurement of the eta-Meson Mass using psi(2S) --> eta J/psi

Details Measurement of the eta-Meson Mass using psi(2S) --> eta J/psi Measurement of the eta-Meson Mass using psi(2S) --> eta J/psi

2007-07-12

arxiv.org/abs/0707.1810v2

Phys.Rev.Lett.99:122002,2007

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.99.122002

We measure the mass of the eta meson using psi(2S) --> eta J/psi events acquired with the CLEO-c detector operating at the CESR e+e- collider. Using the four decay modes eta --> gamma gamma, 3pi0, pi+pi-pi0, and pi+pi-gamma, we find M(eta)=547.785 +- 0.017 +- 0.057 MeV, in which the first uncertainty is statistical and the second systematic. This result has an uncertainty comparable to the two most precise previous measurements and is consistent with that of NA48, but is inconsistent at the level of 6.5sigma with the much smaller mass obtained by GEM.

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