Measurement of the branching ratio for eta pi^0 gamma gamma decay (CROSBI ID 116005)
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. ; 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. ; Manweiler, R. ; Marusic, 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, Ivan ; Tippens, W.B.
engleski
Measurement of the branching ratio for eta pi^0 gamma gamma decay
The branching ratio (BR) for the rare decay eta-->pi^0 gamma gamma was measured with the Crystal Ball multiphoton spectrometer. The result, BR(eta-->pi^0 gamma gamma)=(3.5± ; ; 0.7_stat± ; ; 0.6_syst)×10-4, is in agreement with calculations of chiral perturbation theory to third order. We have used a sample of 28 million eta mesons produced at the BNL Alternating Gradient Synchrotron using the pi-p-->eta n reaction close to threshold. We detail the intricate extraction of the signal, which has about 1.6 thousand eta-->pi^0 gamma gamma events, from the overwhelming background of eta -->3pi^0 decays and from the pi-p-->pi^0 pi^0 n reaction.
branching ratio; rare decay; eta
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