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MULTIMESON PRODUCTION IN pp INTERACTIONS AS A BACKGROUND FOR η AND η ′ DECAYS

By A. Kupsc, P. Moskal and M. Zieliński

Abstract

Multimeson production in pp interactions comprises important background for η, ω and η ′ mesons production experiments and for the studies of their decays planned with WASA detector at COSY. The available information about the reactions is summarized and the need for efforts to describe the processes is stressed. 1 Multimeson production Direct production of three or more pions in proton-proton interactions, has not received proper attention, neither experimentally nor theoretically, despite the fact that it comprises the main background for η, η ′ and ω production experiments. With a 4π facility such as WASA, aiming for measurements of decays of η and η ′ produced in pp interactions [1], the understanding of the pp → ppπππ reactions becomes very important as they constitute a severe background for studies of η and η ′ decays into three pions. Those decays provide key ingredients for determination of the ratios of light quark masses [2,3]

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