Measurement of the eta'-meson mass using J/psi--> gamma eta'

Details Measurement of the eta'-meson mass using J/psi--> gamma eta' Measurement of the eta'-meson mass using J/psi--> gamma eta'

2008-06-13

arxiv.org/abs/0806.2344v2

Phys.Rev.Lett.101:182002,2008

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, available through http://www.lns.cornell.edu/public/CLNS/

Scientific paper

10.1103/PhysRevLett.101.182002

We measure the mass of the eta' meson using psi(2S)--> pi+ pi- J/psi, J/psi--> gamma eta' events acquired with the CLEO-c detector operating at the CESR e+e- collider. Using three decay modes, eta'--> rho0 gamma, eta'--> pi+ pi- eta with eta--> gamma gamma, and eta'--> pi+ pi- eta with eta--> pi+ pi- pi0, we find M(eta') = 957.793 +- 0.054 +- 0.036 MeV, in which the first uncertainty is statistical and the second is systematic. This result is consistent with but substantially more precise than the current world average.

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