We have measured the ratio R = Gamma(K-L --> gammagamma)/Gamma(K-L --> pi(0)pi(0)pi(0)) using the KLOE detector. From a sample of similar to10(9) phi-mesons produced at DAPhiNE, the Frascati phi-factory, we select similar to1.6 x 10(8) K-L-mesons tagged by observing K-S --> pi(+)pi(-) following the reaction e(+)e(-) --> phi --> KLKS. From this sample we select 27,375 K-L --> gammagamma events and obtain R = (2.79 +/- 0.02(stat) +/- 0.02(syst)) X 10(-3). Using the world average value for BR(K-L --> pi(0)pi(0)pi(0)), we obtain BR(K-L --> gammagamma) = (5.89 +/- 0.07 +/- 0.08) x 10(-4) where the second error is due to the uncertainty on the pi(0)pi(0)pi(0) branching fraction. (C) 2003 Published by Elsevier B.V.

Adinolfi, M., Aloisio, A., Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., et al. (2003). Measurement of the ratio Gamma(K-L ->gamma gamma)/Gamma(K-L ->pi(0)pi(0)pi(0)) with the KLOE detector. PHYSICS LETTERS. SECTION B, 566, 61-69 [http://dx.doi.org/10.1016/S0370-2693(03)00810-4].

Measurement of the ratio Gamma(K-L ->gamma gamma)/Gamma(K-L ->pi(0)pi(0)pi(0)) with the KLOE detector

CARBONI, GIOVANNI;MESSI, ROBERTO;SANTOVETTI, EMANUELE;
2003-01-01

Abstract

We have measured the ratio R = Gamma(K-L --> gammagamma)/Gamma(K-L --> pi(0)pi(0)pi(0)) using the KLOE detector. From a sample of similar to10(9) phi-mesons produced at DAPhiNE, the Frascati phi-factory, we select similar to1.6 x 10(8) K-L-mesons tagged by observing K-S --> pi(+)pi(-) following the reaction e(+)e(-) --> phi --> KLKS. From this sample we select 27,375 K-L --> gammagamma events and obtain R = (2.79 +/- 0.02(stat) +/- 0.02(syst)) X 10(-3). Using the world average value for BR(K-L --> pi(0)pi(0)pi(0)), we obtain BR(K-L --> gammagamma) = (5.89 +/- 0.07 +/- 0.08) x 10(-4) where the second error is due to the uncertainty on the pi(0)pi(0)pi(0) branching fraction. (C) 2003 Published by Elsevier B.V.
2003
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
Adinolfi, M., Aloisio, A., Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., et al. (2003). Measurement of the ratio Gamma(K-L ->gamma gamma)/Gamma(K-L ->pi(0)pi(0)pi(0)) with the KLOE detector. PHYSICS LETTERS. SECTION B, 566, 61-69 [http://dx.doi.org/10.1016/S0370-2693(03)00810-4].
Adinolfi, M; Aloisio, A; Ambrosino, F; Antonelli, A; Antonelli, M; Bacci, C; Bencivenni, G; Bertolucci, S; Bini, C; Bloise, C; Bocci, V; Bossi, F; Bra...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/54611
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