Determination of the total width of the eta' meson

E. Czerwinski , P. Moskal , D. Grzonka , R. Czyzykiewicz , D. Gil , B. Kamys , A. Khoukaz , J. Klaja

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P. Klaja W. Krzemien W. Oelert J. Ritman T. Sefzick M. Siemaszko M. Silarski J. Smyrski A. Taschner M. Wolke P. Wustner J. Zdebik M. Zielinski W. Zipper

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classification ⚛️ nucl-ex

keywords mesonmassresolutiontotalwidthadvantagealmostcooler

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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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Determination of the total width of the eta' meson

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