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Measurement of the ηη′ mixing angle in π and K beams with the GAMS-4π Spectrometer

  • S. V. Donskov
  • V. N. Kolosov
  • A. A. Lednev
  • Yu. V. Mikhailov
  • V. A. Polyakov
  • V. D. SamoylenkoEmail author
  • G. V. Khaustov
Regular Article - Experimental Physics

Abstract

The ηη′ mixing angle has been measured with the GAMS-4π 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 |η q 〉 and |η s 〉 components of the meson wave function. The cross section ratio at t′=0 (GeV/c)2 in the π beam is R π (η′/η)=0.54±0.04, and the mixing angle ϕ P =(36.3±1.0). For the K beam the ratio is R K (η′/η)=1.27±0.15. It was found that the gluonium content in η′ is sin2 ϕ G =0.17±0.07.

Keywords

Differential Cross Section Pseudoscalar Meson Cross Section Ratio Meson Wave Function Gluon Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to Professors A.K. Likhoded and A.V. Luchinsky for useful discussions.

Open Access

This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Copyright information

© The Author(s) 2013

Authors and Affiliations

  • S. V. Donskov
    • 1
  • V. N. Kolosov
    • 1
  • A. A. Lednev
    • 1
  • Yu. V. Mikhailov
    • 1
  • V. A. Polyakov
    • 1
  • V. D. Samoylenko
    • 1
    Email author
  • G. V. Khaustov
    • 1
  1. 1.Institute for High Energy PhysicsProtvinoRussia

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