Measurement of the invariant-mass spectrum for the two photons from the eta--->pi0 gamma gamma decay (CROSBI ID 148683)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
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. G. ; . Kruglov, S. ; Lolos, G. ; Lopatin, I. ; Manley, D. M. ; Manweiler, R. ; Marušić, Aljoša ; 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, Ivan
engleski
Measurement of the invariant-mass spectrum for the two photons from the eta--->pi0 gamma gamma decay
New results on the rare, doubly radiative decay eta -->pi0 gama gamma 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, Gamma (eta-->pi0 gamma gamma), on the two-photon invariant mass squared, m2(gamma gamma). A re-evaluation of the branching ratio is also made, BR(eta-->pi0 gamma gamma= (2.21± 0.24stat± 0.47syst)×10-4 ; it implies that the decay width is Gamma(eta-->pi0 gamma gamma) =0.285± 0.031stat± 0.061syst eV. These results are close to predictions based on chiral perturbation theory with vector-meson dominance.
invariant mass spectrum; eta
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Podaci o izdanju
78 (1)
2008.
015206-1-015206-10
objavljeno
0556-2813
10.1103/PhysRevC.78.015206
