Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay

S. Prakhov; B. M K Nefkens; C. E. Allgower; V. Bekrenev; W. J. Briscoe; 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

doi:10.1103/PhysRevC.78.015206

Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay

S. Prakhov, B. M K Nefkens, C. E. Allgower, V. Bekrenev, W. J. Briscoe, 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. McDonaldJ. 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

Physics

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Abstract

New results on the rare, doubly radiative decay η→π0γ γ have been obtained from a revised analysis of the Crystal Ball experiment performed at the AGS. The analysis yields the first information on the dependence of the decay width, Γ(η→π0γγ), on the two-photon invariant mass squared, m2(γγ). A re-evaluation of the branching ratio is also made, BR(η→π0γγ)=(2. 21±0.24stat±0.47syst)×10-4; it implies that the decay width is Γ(η→π0γγ)=0.285±0.031stat±0. 061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.

Original language	English (US)
Article number	015206
Journal	Physical Review C - Nuclear Physics
Volume	78
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.78.015206
State	Published - Jul 24 2008

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Prakhov, S., Nefkens, B. M. K., Allgower, C. E., Bekrenev, V., Briscoe, W. J., 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., Marušić, A., ... Supek, I. (2008). Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay. Physical Review C - Nuclear Physics, 78(1), Article 015206. https://doi.org/10.1103/PhysRevC.78.015206

Prakhov, S, Nefkens, BMK, Allgower, CE, Bekrenev, V, Briscoe, WJ, 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 2008, 'Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay', Physical Review C - Nuclear Physics, vol. 78, no. 1, 015206. https://doi.org/10.1103/PhysRevC.78.015206

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title = "Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay",

abstract = "New results on the rare, doubly radiative decay η→π0γ γ have been obtained from a revised analysis of the Crystal Ball experiment performed at the AGS. The analysis yields the first information on the dependence of the decay width, Γ(η→π0γγ), on the two-photon invariant mass squared, m2(γγ). A re-evaluation of the branching ratio is also made, BR(η→π0γγ)=(2. 21±0.24stat±0.47syst)×10-4; it implies that the decay width is Γ(η→π0γγ)=0.285±0.031stat±0. 061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.",

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doi = "10.1103/PhysRevC.78.015206",

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AU - Prakhov, S.

AU - Nefkens, B. M K

AU - Allgower, C. E.

AU - Bekrenev, V.

AU - Briscoe, W. J.

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.

PY - 2008/7/24

Y1 - 2008/7/24

N2 - New results on the rare, doubly radiative decay η→π0γ γ have been obtained from a revised analysis of the Crystal Ball experiment performed at the AGS. The analysis yields the first information on the dependence of the decay width, Γ(η→π0γγ), on the two-photon invariant mass squared, m2(γγ). A re-evaluation of the branching ratio is also made, BR(η→π0γγ)=(2. 21±0.24stat±0.47syst)×10-4; it implies that the decay width is Γ(η→π0γγ)=0.285±0.031stat±0. 061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.

AB - New results on the rare, doubly radiative decay η→π0γ γ have been obtained from a revised analysis of the Crystal Ball experiment performed at the AGS. The analysis yields the first information on the dependence of the decay width, Γ(η→π0γγ), on the two-photon invariant mass squared, m2(γγ). A re-evaluation of the branching ratio is also made, BR(η→π0γγ)=(2. 21±0.24stat±0.47syst)×10-4; it implies that the decay width is Γ(η→π0γγ)=0.285±0.031stat±0. 061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.

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Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay

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