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- Title
Measurement of the <i>η</i>–<i>η</i>′ mixing angle in <i>π</i><sup>−</sup> and <i>K</i><sup>−</sup> beams with the GAMS-4<i>π</i> Spectrometer.
- Authors
Donskov, S. V.; Kolosov, V. N.; Lednev, A. A.; Mikhailov, Yu. V.; Polyakov, V. A.; Samoylenko, V. D.; Khaustov, G. V.
- Abstract
The η– η′ mixing angle has been measured with the GAMS-4 π spectrometer in a high statistics experiment. η′ and η mesons were generated with charge–exchange reactions in 32.5 GeV/c π− and K− beams. Using both π− and K− beams allows the study of the | ηq〉 and | ηs〉 components of the meson wave function. The cross section ratio at t′=0 (GeV/c) 2 in the π− beam is Rπ( η′/ η)=0.54±0.04, and the mixing angle ϕP=(36.3±1.0) ∘. For the K− beam the ratio is RK( η′/ η)=1.27±0.15. It was found that the gluonium content in η′ is sin 2ϕG=0.17±0.07.
- Subjects
RADIOACTIVE nuclear beams; SPECTROMETERS; NUCLEAR physics experiments; NUCLEAR charge; MESONS; MIXING
- Publication
European Physical Journal C -- Particles & Fields, 2013, Vol 73, Issue 10, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-013-2614-4