Reaction pp -> pp πππas a background for hadronic decays of the eta-prime meson

Abstract

Isospin violating hadronic decays of the ηand η' mesons into 3πmesons 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 η,η'\toπππis coming from direct three pion production reactions. In case of the ηmeson 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 η'\to 3πdecays. Using the inclusive data from COSY-11 experiment we have extracted differential cross section for the pp\to pp-multipion production reactions with the invariant mass of the pions equal to the η' meson mass and estimated an upper limit for the signal to background ratio for studies of the η'\toπ^+π^-π^0 decay.

correction of formula (1) on page 2 - square missing

References in corpus (8)

• Physics with the KLOE-2 experiment at the upgraded DA$\varphi$NE
• Measurement of the dp -->3He eta reaction near threshold
• Determination of the Dalitz plot parameter alpha for the decay eta->3pi^0 with the Crystal Ball at MAMI-B
• Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction
• Measurement of the invariant mass distributions for the pp -> ppeta' reaction at excess energy of Q = 16.4 MeV
• $\eta$ and ${\eta }^{\prime }$ Physics at BES-III
• eta and eta' Physics at MAMI
• Near threshold eta meson production in dp collisions