Test of charge conjugation invariance

B. M K Nefkens, S. Prakhov, A. Gårdestig, C. E. Allgower, V. Bekrenev, W. J. Briscoe, M. Clajus, J. R. Comfort, K. Craig, D. Grosnick, D. Isenhower, N. Knecht, D. Koetke, A. Koulbardis, N. Kozlenko, S. Kruglov, G. Lolos, I. Lopatin, D. M. Manley, R. ManweilerA. Marušić, S. McDonald, J. Olmsted, Z. Papandreou, D. Peaslee, N. Phaisangittisakul, J. W. Price, A. F. Ramirez, M. Sadler, A. Shafi, H. Spinka, T. D S Stanislaus, A. Starostin, H. M. Staudenmaier, I. Supek, W. B. Tippens

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

We report on the first determination of upper limits on the branching ratio (BR) of η decay to π0π0γ and to π0π0γ. Both decay modes are strictly forbidden by charge conjugation (C) invariance. Using the Crystal Ball multiphoton detector, we obtained BR(η→ π0 π0) < 5 × 10-4 at the 90% confidence level, in support of C invariance of isoscalar electromagnetic interactions of the light quarks. We have also measured BR(η→ π0π0γ) < 6 × 10-5 at the 90% confidence level, in support of C invariance of isovector electromagnetic interactions.

Original languageEnglish (US)
Article number041601
JournalPhysical Review Letters
Volume94
Issue number4
DOIs
StatePublished - Feb 4 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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