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, 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
TL;DR
This study precisely measured the total width of the eta' meson using advanced proton-beam and detector technology, significantly improving the resolution over previous experiments and providing a more accurate value.
Contribution
The paper presents the first high-resolution measurement of the eta' meson width, utilizing COSY's low-emittance beam and COSY-11 detector for enhanced precision.
Findings
Total width of eta' meson: 0.226 +- 0.017(stat.) +- 0.014(syst.) MeV/c^2
Mass distribution resolution improved by nearly an order of magnitude
Over 2300 eta' events reconstructed
Abstract
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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