Determination of the total width of the eta' meson

Details Determination of the total width of the eta' meson Determination of the total width of the eta' meson

2010-08-31

arxiv.org/abs/1008.5294v2

Phys.Rev.Lett.105:122001,2010

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.122001

Taking advantage of both the low-emittance proton-beam of the Cooler Synchrotron COSY and the high momentum precision of the COSY-11 detector system, the mass distribution of the eta' meson was measured with a resolution of 0.33 MeV/c^2 (FWHM), improving the experimental mass resolution by almost an order of magnitude with respect to previous results. Based on the sample of more than 2300 reconstructed pp --> pp eta' events the total width of the eta' meson was determined to be 0.226 +- 0.017(stat.) +- 0.014(syst.) MeV/c^2.

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