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Reaction pp -> pp pi pi pi as a background for hadronic decays of the eta ' meson
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2011 (English)In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 47, no 8, 93- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 47, no 8, 93- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-160217DOI: 10.1140/epja/i2011-11093-4ISI: 000295170900010OAI: oai:DiVA.org:uu-160217DiVA: diva2:448731
Available from: 2011-10-18 Created: 2011-10-18 Last updated: 2016-05-10Bibliographically approved

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