Measurement of the branching ratio for η→π0γγ decay

S. Prakhov; B. M K Nefkens; C. E. Allgower; V. Bekrenev; W. J. Briscoe; M. Clajus; J. R. Comfort; K. Craig; D. Grosnick; G. M. Huber; D. Isenhower; N. Knecht; D. Koetke; A. Koulbardis; N. Kozlenko; S. Kruglov; G. Lolos; I. Lopatin; D. M. Manley; R. Manweiler; A. Maruić; 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.72.025201

Measurement of the branching ratio for η→π0γγ decay

S. Prakhov, B. M K Nefkens, C. E. Allgower, V. Bekrenev, W. J. Briscoe, M. Clajus, J. R. Comfort, K. Craig, D. Grosnick, G. M. Huber, D. Isenhower, N. Knecht, D. Koetke, A. Koulbardis, N. Kozlenko, S. Kruglov, G. Lolos, I. Lopatin, D. M. Manley, R. ManweilerA. Maruić, 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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30 Scopus citations

Abstract

The branching ratio (BR) for the rare decay η→π0γγ was measured with the Crystal Ball multiphoton spectrometer. The result, BR(η→π0γγ)=(3.5±0.7stat±0.6syst) ×10-4, is in agreement with calculations of chiral perturbation theory to third order. We have used a sample of 28 million η mesons produced at the BNL Alternating Gradient Synchrotron using the π-p→ηn reaction close to threshold. We detail the intricate extraction of the signal, which has about 1.6 thousand η→π0γγ events, from the overwhelming background of η→3π0 decays and from the π-p→π0π0n reaction.

Original language	English (US)
Article number	025201
Journal	Physical Review C - Nuclear Physics
Volume	72
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.72.025201
State	Published - Aug 2005

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.72.025201

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Prakhov, S., Nefkens, B. M. K., Allgower, C. E., Bekrenev, V., Briscoe, W. J., Clajus, M., Comfort, J. R., Craig, K., Grosnick, D., Huber, G. M., Isenhower, D., Knecht, N., Koetke, D., Koulbardis, A., Kozlenko, N., Kruglov, S., Lolos, G., Lopatin, I., Manley, D. M., ... Tippens, W. B. (2005). Measurement of the branching ratio for η→π0γγ decay. Physical Review C - Nuclear Physics, 72(2), Article 025201. https://doi.org/10.1103/PhysRevC.72.025201

Prakhov, S, Nefkens, BMK, Allgower, CE, Bekrenev, V, Briscoe, WJ, Clajus, M, Comfort, JR, Craig, K, Grosnick, D, Huber, GM, Isenhower, D, Knecht, N, Koetke, D, Koulbardis, A, Kozlenko, N, Kruglov, S, Lolos, G, Lopatin, I, Manley, DM, Manweiler, R, Maruić, 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, 'Measurement of the branching ratio for η→π0γγ decay', Physical Review C - Nuclear Physics, vol. 72, no. 2, 025201. https://doi.org/10.1103/PhysRevC.72.025201

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title = "Measurement of the branching ratio for η→π0γγ decay",

abstract = "The branching ratio (BR) for the rare decay η→π0γγ was measured with the Crystal Ball multiphoton spectrometer. The result, BR(η→π0γγ)=(3.5±0.7stat±0.6syst) ×10-4, is in agreement with calculations of chiral perturbation theory to third order. We have used a sample of 28 million η mesons produced at the BNL Alternating Gradient Synchrotron using the π-p→ηn reaction close to threshold. We detail the intricate extraction of the signal, which has about 1.6 thousand η→π0γγ events, from the overwhelming background of η→3π0 decays and from the π-p→π0π0n reaction.",

author = "S. Prakhov and Nefkens, {B. M K} and Allgower, {C. E.} and V. Bekrenev and Briscoe, {W. J.} and M. Clajus and Comfort, {J. R.} and K. Craig and D. Grosnick and Huber, {G. M.} 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. Marui{\'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",

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doi = "10.1103/PhysRevC.72.025201",

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AU - Prakhov, S.

AU - Nefkens, B. M K

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 - Huber, G. M.

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 - Maruić, 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 - 2005/8

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N2 - The branching ratio (BR) for the rare decay η→π0γγ was measured with the Crystal Ball multiphoton spectrometer. The result, BR(η→π0γγ)=(3.5±0.7stat±0.6syst) ×10-4, is in agreement with calculations of chiral perturbation theory to third order. We have used a sample of 28 million η mesons produced at the BNL Alternating Gradient Synchrotron using the π-p→ηn reaction close to threshold. We detail the intricate extraction of the signal, which has about 1.6 thousand η→π0γγ events, from the overwhelming background of η→3π0 decays and from the π-p→π0π0n reaction.

AB - The branching ratio (BR) for the rare decay η→π0γγ was measured with the Crystal Ball multiphoton spectrometer. The result, BR(η→π0γγ)=(3.5±0.7stat±0.6syst) ×10-4, is in agreement with calculations of chiral perturbation theory to third order. We have used a sample of 28 million η mesons produced at the BNL Alternating Gradient Synchrotron using the π-p→ηn reaction close to threshold. We detail the intricate extraction of the signal, which has about 1.6 thousand η→π0γγ events, from the overwhelming background of η→3π0 decays and from the π-p→π0π0n reaction.

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Measurement of the branching ratio for η→π0γγ decay

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