Abstract
Isospin violating hadronic decays of the \( \eta\) and \( \eta{^\prime}\) mesons into 3\( \pi\) mesons are driven by a term in the QCD Lagrangian proportional to the mass difference of the d and u quarks. The source giving large yield of the mesons for such decay studies are pp interactions close to the respective kinematical thresholds. The most important physics background for \( \eta\),\( \eta{^\prime}\) \( \rightarrow\) \( \pi\) \( \pi\) \( \pi\) is coming from direct three-pion production reactions. In case of the \( \eta\) meson the background for the decays is relatively low ( \( \approx\) 10% . The purpose of this article is to provide an estimate of the direct pion production background for the \( \eta{^\prime}\) \( \rightarrow\) 3\( \pi\) decays. Using the inclusive data from the COSY-11 experiment we have extracted the differential cross-section for the pp \( \rightarrow\) pp -multipion production reactions with the invariant mass of the pions equal to the \( \eta{^\prime}\) meson mass and estimated an upper limit for the signal to background ratio for studies of the \( \eta{^\prime}\) \( \rightarrow\) \( \pi^{+}_{}\) \( \pi^{-}_{}\) \( \pi^{0}_{}\) decay.
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Zieliński, M.J., Moskal, P. & Kupść, A. Reaction pp \( \rightarrow\) pp\( \pi\) \( \pi\) \( \pi\) as a background for hadronic decays of the \( \eta^{{\prime}}_{}\) meson. Eur. Phys. J. A 47, 93 (2011). https://doi.org/10.1140/epja/i2011-11093-4
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DOI: https://doi.org/10.1140/epja/i2011-11093-4