Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î

B. M K Nefkens; S. Prakhov; C. E. Allgower; V. Bekrenv; 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. Marusić; 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/PhysRevC.72.035212

Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î

B. M K Nefkens, S. Prakhov, C. E. Allgower, V. Bekrenv, 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. MarusićS. 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

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

A new upper limit is presented for the branching ratio (BR) of Î•â† 3Î. This decay is not allowed by charge-conjugation invariance. We have determined that BR(Î•â † 3Î)<4Ã 10-5. We also obtained BR(Î•â † Ï€0Î â† 3Î)<9Ã- 10-5; this decay mode is absolutely forbidden, as it violates conservation of angular momentum. Finally, we have established that BR(Î•â† Ï€0Ï€0Î Î)<1.2Ã 10-3 in a restricted diphoton-energy region. All three upper limits are at the 90% confidence level. They were obtained by using the Crystal Ball multiphoton spectrometer at the AGS and are based on the analysis of 28 million Î• mesons produced in the Ï€-pâ† Î•n reaction close to threshold.

Original language	English (US)
Article number	035212
Journal	Physical Review C - Nuclear Physics
Volume	72
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.72.035212
State	Published - Sep 2005

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.72.035212

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Nefkens, B. M. K., Prakhov, S., Allgower, C. E., Bekrenv, 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., Manweiler, R., ... Tippens, W. B. (2005). Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î. Physical Review C - Nuclear Physics, 72(3), Article 035212. https://doi.org/10.1103/PhysRevC.72.035212

Nefkens, BMK, Prakhov, S, Allgower, CE, Bekrenv, 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, Marusić, 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, 'Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î', Physical Review C - Nuclear Physics, vol. 72, no. 3, 035212. https://doi.org/10.1103/PhysRevC.72.035212

@article{2bba91a7082d4cd8aada7feb38c4f19f,

title = "Search for the forbidden decays {\^I}•{\^a}† 3{\^I} and {\^I}•{\^a}† {\"I}€0{\^I} and the rare decay {\^I}•{\^a}† {\"I}€0{\"I}€0{\^I} {\^I}",

abstract = "A new upper limit is presented for the branching ratio (BR) of {\^I}•{\^a}† 3{\^I}. This decay is not allowed by charge-conjugation invariance. We have determined that BR({\^I}•{\^a} † 3{\^I})<4{\~A} 10-5. We also obtained BR({\^I}•{\^a} † {\"I}€0{\^I} {\^a}† 3{\^I})<9{\~A}- 10-5; this decay mode is absolutely forbidden, as it violates conservation of angular momentum. Finally, we have established that BR({\^I}•{\^a}† {\"I}€0{\"I}€0{\^I} {\^I})<1.2{\~A} 10-3 in a restricted diphoton-energy region. All three upper limits are at the 90% confidence level. They were obtained by using the Crystal Ball multiphoton spectrometer at the AGS and are based on the analysis of 28 million {\^I}• mesons produced in the {\"I}€-p{\^a}† {\^I}•n reaction close to threshold.",

author = "Nefkens, {B. M K} and S. Prakhov and Allgower, {C. E.} and V. Bekrenv and Briscoe, {W. J.} and M. Clajus and Comfort, {J. R.} and K. Craig and D. Grosnick and D. Isenhower and N. Knecht and D. Koetke and A. Koulbardis and N. Kozlenko and S. Kruglov and G. Lolos and I. Lopatin and Manley, {D. M.} and R. Manweiler and A. Marusi{\'c} and S. McDonald and J. Olmsted and Z. Papandreou and D. Peaslee and N. Phaisangittisakul and Price, {J. W.} and Ramirez, {A. F.} and M. Sadler and A. Shafi and H. Spinka and Stanislaus, {T. D S} and A. Starostin and Staudenmaier, {H. M.} and I. Supek and Tippens, {W. B.}",

year = "2005",

month = sep,

doi = "10.1103/PhysRevC.72.035212",

language = "English (US)",

volume = "72",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

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T1 - Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î

AU - Nefkens, B. M K

AU - Prakhov, S.

AU - Allgower, C. E.

AU - Bekrenv, 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 - Marusić, 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 - 2005/9

Y1 - 2005/9

N2 - A new upper limit is presented for the branching ratio (BR) of Î•â† 3Î. This decay is not allowed by charge-conjugation invariance. We have determined that BR(Î•â † 3Î)<4Ã 10-5. We also obtained BR(Î•â † Ï€0Î â† 3Î)<9Ã- 10-5; this decay mode is absolutely forbidden, as it violates conservation of angular momentum. Finally, we have established that BR(Î•â† Ï€0Ï€0Î Î)<1.2Ã 10-3 in a restricted diphoton-energy region. All three upper limits are at the 90% confidence level. They were obtained by using the Crystal Ball multiphoton spectrometer at the AGS and are based on the analysis of 28 million Î• mesons produced in the Ï€-pâ† Î•n reaction close to threshold.

AB - A new upper limit is presented for the branching ratio (BR) of Î•â† 3Î. This decay is not allowed by charge-conjugation invariance. We have determined that BR(Î•â † 3Î)<4Ã 10-5. We also obtained BR(Î•â † Ï€0Î â† 3Î)<9Ã- 10-5; this decay mode is absolutely forbidden, as it violates conservation of angular momentum. Finally, we have established that BR(Î•â† Ï€0Ï€0Î Î)<1.2Ã 10-3 in a restricted diphoton-energy region. All three upper limits are at the 90% confidence level. They were obtained by using the Crystal Ball multiphoton spectrometer at the AGS and are based on the analysis of 28 million Î• mesons produced in the Ï€-pâ† Î•n reaction close to threshold.

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U2 - 10.1103/PhysRevC.72.035212

DO - 10.1103/PhysRevC.72.035212

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VL - 72

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

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M1 - 035212

ER -

Search for the forbidden decays Î•â† 3Î and Î•â† Ï€0Î and the rare decay Î•â† Ï€0Ï€0Î Î

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