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

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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

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nefkens, B. M. K., Prakhov, S., Gårdestig, A., Allgower, C. E., Bekrenev, V., Briscoe, W. J., Clajus, M., Comfort, J. R., Craig, K., Grosnick, D., Isenhower, D., Knecht, N., Koetke, D., Koulbardis, A., Kozlenko, N., Kruglov, S., Lolos, G., Lopatin, I., Manley, D. M., ... Tippens, W. B. (2005). Test of charge conjugation invariance. Physical Review Letters, 94(4), [041601]. https://doi.org/10.1103/PhysRevLett.94.041601