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

Research output: Contribution to journalArticle

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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 languageEnglish (US)
Article number015206
JournalPhysical Review C - Nuclear Physics
Volume78
Issue number1
DOIs
StatePublished - Jul 24 2008

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mass spectra
photons
decay
vector mesons
balls
perturbation theory
evaluation
predictions
crystals

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Prakhov, S., Nefkens, B. M. K., Allgower, C. E., Bekrenev, V., Briscoe, W. J., Comfort, J. R., ... 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), [015206]. https://doi.org/10.1103/PhysRevC.78.015206

Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay. / 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.; McDonald, S.; Olmsted, J.; Papandreou, Z.; Peaslee, D.; Phaisangittisakul, N.; Price, J. W.; Ramirez, A. F.; Sadler, M.; Shafi, A.; Spinka, H.; Stanislaus, T. D S; Starostin, A.; Staudenmaier, H. M.; Supek, I.

In: Physical Review C - Nuclear Physics, Vol. 78, No. 1, 015206, 24.07.2008.

Research output: Contribution to journalArticle

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
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. ; McDonald, S. ; Olmsted, J. ; Papandreou, Z. ; Peaslee, D. ; Phaisangittisakul, N. ; Price, J. W. ; Ramirez, A. F. ; Sadler, M. ; Shafi, A. ; Spinka, H. ; Stanislaus, T. D S ; Starostin, A. ; Staudenmaier, H. M. ; Supek, I. / Measurement of the invariant-mass spectrum for the two photons from the η→π0γγ decay. In: Physical Review C - Nuclear Physics. 2008 ; Vol. 78, No. 1.
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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.

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