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. Manweiler; A. 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

doi:10.1103/PhysRevLett.94.041601

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

Physics

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13 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 language	English (US)
Article number	041601
Journal	Physical Review Letters
Volume	94
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.94.041601
State	Published - Feb 4 2005

ASJC Scopus subject areas

Physics and Astronomy(all)

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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), Article 041601. https://doi.org/10.1103/PhysRevLett.94.041601

Nefkens, BMK, Prakhov, S, Gårdestig, A, Allgower, CE, Bekrenev, V, Briscoe, WJ, Clajus, M, Comfort, JR, Craig, K, Grosnick, D, Isenhower, D, Knecht, N, Koetke, D, Koulbardis, A, Kozlenko, N, Kruglov, S, Lolos, G, Lopatin, I, Manley, DM, Manweiler, R, Marušić, A, McDonald, S, Olmsted, J, Papandreou, Z, Peaslee, D, Phaisangittisakul, N, Price, JW, Ramirez, AF, Sadler, M, Shafi, A, Spinka, H, Stanislaus, TDS, Starostin, A, Staudenmaier, HM, Supek, I & Tippens, WB 2005, 'Test of charge conjugation invariance', Physical Review Letters, vol. 94, no. 4, 041601. https://doi.org/10.1103/PhysRevLett.94.041601

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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.",

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AU - Nefkens, B. M K

AU - Prakhov, S.

AU - Gårdestig, A.

AU - Allgower, C. E.

AU - Bekrenev, V.

AU - Briscoe, W. J.

AU - Clajus, M.

AU - Comfort, J. R.

AU - Craig, K.

AU - Grosnick, D.

AU - Isenhower, D.

AU - Knecht, N.

AU - Koetke, D.

AU - Koulbardis, A.

AU - Kozlenko, N.

AU - Kruglov, S.

AU - Lolos, G.

AU - Lopatin, I.

AU - Manley, D. M.

AU - Manweiler, R.

AU - Marušić, A.

AU - McDonald, S.

AU - Olmsted, J.

AU - Papandreou, Z.

AU - Peaslee, D.

AU - Phaisangittisakul, N.

AU - Price, J. W.

AU - Ramirez, A. F.

AU - Sadler, M.

AU - Shafi, A.

AU - Spinka, H.

AU - Stanislaus, T. D S

AU - Starostin, A.

AU - Staudenmaier, H. M.

AU - Supek, I.

AU - Tippens, W. B.

PY - 2005/2/4

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N2 - 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.

AB - 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.

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Test of charge conjugation invariance

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