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

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30 Scopus citations

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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