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 DAFNE.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 |epsilon| to be (2.216±0.013)×10−3.
Measurement of the branching ratio of the K(L) --> pi+ pi- decay with the KLOE detector / Ambrosino, Fabio; T., Capussela; Chiefari, Giovanni; C., Di Donato; Massarotti, Paolo; S., Meola; Napolitano, Marco; F., Perfetto; Saracino, Giulio. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - B638:(2006), pp. 140-145. [10.1016/j.physletb.2006.05.039]
Measurement of the branching ratio of the K(L) --> pi+ pi- decay with the KLOE detector
AMBROSINO, FABIO;CHIEFARI, GIOVANNI;MASSAROTTI, PAOLO;NAPOLITANO, MARCO;SARACINO, GIULIO
2006
Abstract
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 DAFNE.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 |epsilon| to be (2.216±0.013)×10−3.| File | Dimensione | Formato | |
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