Reaction pp -&gt; pp pi pi pi as a background for hadronic decays of the eta ' meson

Zielinski, M. J.; Moskal, P.; Kupsc, A.

doi:10.1140/epja/i2011-11093-4

Journal Article

PreJuSER-19480

Reaction pp -> pp pi pi pi as a background for hadronic decays of the eta ' meson

Zielinski, M. J. ; Moskal, P.FZJ* ; Kupsc, A.

2011
Springer Berlin

The European physical journal / A 47, 93 (2011) [10.1140/epja/i2011-11093-4]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10274 doi:10.1140/epja/i2011-11093-4

Abstract: Isospin violating hadronic decays of the eta and eta ' 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 ' -> 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 (approximate to 10%). The purpose of this article is to provide an estimate of the direct pion production background for the eta ' -> 3 pi decays. Using the inclusive data from the COSY-11 experiment we have extracted the differential cross-section for the pp -> pp-multipion production reactions with the invariant mass of the pions equal to the eta ' meson mass and estimated an upper limit for the signal to background ratio for studies of the eta ' -> pi(+)pi(-)pi(0)decay.

Keyword(s): background: upper limit ; eta(958): rare decay ; pi: multiple production ; isospin: violation ; differential cross section ; missing-mass ; kinematics ; COSY-11 ; p p: inelastic scattering ; eta: hadroproduction ; threshold ; mass spectrum: (3pi) ; channel cross section: energy dependence ; experimental results ; Juelich COSY PS ; p p --> 2p anything ; p p --> 2p pi+ pi- pi0 ; eta --> pi+ pi- pi0

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Note: The work was partially supported by the European Commission through the Research Infrastructures action of the Capacities Program. Call: FP7-INFRASTRUCTURES-2008-1, Grant Agreement No. 227431, by the PrimeNet, by the FFE grants from the Research Center Julich, by the MPD programme of the Foundation for Polish Science through structural funds of the European Union and by the DOCTUS programme of Malopolskie Centre of Entrepreneurship through structural funds of the European Union.

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