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Tests of the fundamental symmetries in η meson decays
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
2011 (English)In: Journal of Physics: Conference Series, Vol. 335Article in journal (Refereed) Published
Abstract [en]

Patterns of chiral symmetry violation and tests of the conservation of the fundamental C , P and CP symmetries are key physics issues in studies of the Ï€ 0 , η and η’ meson decays. These tests include searches for rare or forbidden decays and searches for asymmetries among the decay products in the not-so-rare decays. Some examples for the rare decays are η → 2 Ï€ , η → 4 Ï€ 0 ( CP tests), decays into an odd number of photons ( e.g. , η → 3 γ ) and the decay η → Ï€ 0 e + e − ( C tests). In the conversion decay η → Ï€ + Ï€ − e + e − , the asymmetry in the distribution of the angle between the two-pion and two-lepton decay planes allows to search for CP violation in a flavor-conserving process beyond the CKM mechanism which is not constrained by the limits on the neutron dipole moment. In addition, the Dalitz decays and the decays into a lepton-antilepton pair are sensitive to contributions from a vector boson responsible for the annihilation of hypothetical light dark matter particles. The muon g – 2 and the branching ratio for the Ï€ 0 e + e − decay are currently the observables where hints of a deviation from the Standard Model predictions are reported. The experimental studies of the Ï€ 0 , η and η’ meson decays are carried out at four European accelerator research facilities: KLOE/KLOE-2 at DAFNE (Frascati), Crystal Ball at MAMI (Mainz), WASA at COSY (JÃŒlich), Crystal Barrel at ELSA (Bonn).

Place, publisher, year, edition, pages
2011. Vol. 335
National Category
Subatomic Physics
URN: urn:nbn:se:uu:diva-170099OAI: oai:DiVA.org:uu-170099DiVA: diva2:508281
Available from: 2012-03-07 Created: 2012-03-07 Last updated: 2016-05-10

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