Measurement of the branching ratio of the KL→π+π− decay with the KLOE detector

We present a measurement of the branching ratio of the CP violating decay KL→π+π− performed by the KLOE experiment at the ϕ factory DAΦNE. We use 328 pb−1 of data collected in 2001 and 2002, corresponding to ∼150 million tagged KL mesons. We find BR(KL→π+π−)=(1.963±0.012stat.±0.017syst.)×10−3. This...

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Bibliographic Details
Published in:Physics letters. B 2006-07, Vol.638 (2-3), p.140-145
Main Authors: Ambrosino, F., Antonelli, A., Antonelli, M., Bacci, C., Beltrame, P., Bencivenni, G., Bertolucci, S., Bini, C., Bloise, C., Bocci, V., Bossi, F., Bowring, D., Branchini, P., Caloi, R., Campana, P., Capon, G., Capussela, T., Ceradini, F., Chi, S., Chiefari, G., Ciambrone, P., Conetti, S., De Lucia, E., De Santis, A., De Simone, P., De Zorzi, G., Dell'Agnello, S., Denig, A., Di Domenico, A., Di Donato, C., Di Falco, S., Di Micco, B., Doria, A., Dreucci, M., Felici, G., Ferrari, A., Ferrer, M.L., Finocchiaro, G., Fiore, S., Forti, C., Franzini, P., Gatti, C., Gauzzi, P., Giovannella, S., Gorini, E., Graziani, E., Incagli, M., Kluge, W., Kulikov, V., Lacava, F., Lanfranchi, G., Lee-Franzini, J., Leone, D., Martini, M., Massarotti, P., Mei, W., Meola, S., Miscetti, S., Moulson, M., Müller, S., Murtas, F., Napolitano, M., Nguyen, F., Palutan, M., Pasqualucci, E., Passeri, A., Patera, V., Perfetto, F., Pontecorvo, L., Primavera, M., Santangelo, P., Santovetti, E., Saracino, G., Sciascia, B., Sciubba, A., Scuri, F., Sfiligoi, I., Sibidanov, A., Spadaro, T., Testa, M., Tortora, L., Valente, P., Valeriani, B., Venanzoni, G., Veneziano, S., Ventura, A., Versaci, R., Xu, G.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary:We present a measurement of the branching ratio of the CP violating decay KL→π+π− performed by the KLOE experiment at the ϕ factory DAΦNE. We use 328 pb−1 of data collected in 2001 and 2002, corresponding to ∼150 million tagged KL mesons. We find BR(KL→π+π−)=(1.963±0.012stat.±0.017syst.)×10−3. This branching ratio measurement is fully inclusive of final-state radiation. Using the above result, we determine the modulus of the amplitude ratio |η+−| to be (2.219±0.013)×10−3 and |ϵ| to be (2.216±0.013)×10−3.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2006.05.039