We report the result of a search for the rare decay B(0) -> gamma gamma in 426 fb(-1) of data corresponding to 226 x 10(6) B(0)(B) over bar (0) pairs collected on the Y(4S) resonance at the PEP-II asymmetric-energy e(+)e(-) collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21(-12)(+13) signal events with a statistical significance of 1.8 sigma. This corresponds to a branching fraction B(B(0) -> gamma gamma) = (1.7 +/- 1.1(stat.) +/- 0.2(syst.)) x 10(-7). Based on this result we set a 90% confidence level upper limit of B(B(0) -> gamma gamma) < 3.2 x 10(-7).
Search for the decay B(0) -> gamma gamma
ANDREOTTI, Mirco;BETTONI, Diego;BOZZI, Concezio;CALABRESE, Roberto;CECCHI, Annalisa;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;FRANCHINI, Paolo;LUPPI, Eleonora;MUNERATO, Mauro;NEGRINI, Matteo;PETRELLA, Antonio;PIEMONTESE, Livio;
2011
Abstract
We report the result of a search for the rare decay B(0) -> gamma gamma in 426 fb(-1) of data corresponding to 226 x 10(6) B(0)(B) over bar (0) pairs collected on the Y(4S) resonance at the PEP-II asymmetric-energy e(+)e(-) collider using the BABAR detector. We use a maximum likelihood fit to extract the signal yield and observe 21(-12)(+13) signal events with a statistical significance of 1.8 sigma. This corresponds to a branching fraction B(B(0) -> gamma gamma) = (1.7 +/- 1.1(stat.) +/- 0.2(syst.)) x 10(-7). Based on this result we set a 90% confidence level upper limit of B(B(0) -> gamma gamma) < 3.2 x 10(-7).File in questo prodotto:
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