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- W1567762003 abstract "The authors observed a new neutral kaon decay mode, KL → π±e∓$bar{v}$e+e- for the first time. Based on the 20225 events including 1018 ± 25 background events, they determined the branching ratio, B(KL → π±e∓$bar{v}$e+e-; Me+e- > 5 MeV/c2, E*+e- > 30 MeV) = (1.281 ± 0.041) x 10 -5. This branching ratio agrees with a theoretical prediction based on the chiral perturbation theory (XPT) calculation at Ο(p4). Most of the kinematical distributions agree with the XPT Ο(p4) calculation. They also measured one of the low energy coupling constants for the XPT Ο(p4), L$ratop{9}$= (8.0 ± 1.6) x 10-3. The Me+e- distribution below 100 MeV showed a 3 σ deviation from the XPT O(p4) calculation. This requires further studies in theory and experiments." @default.
- W1567762003 created "2016-06-24" @default.
- W1567762003 creator A5028282788 @default.
- W1567762003 date "2006-09-01" @default.
- W1567762003 modified "2023-09-23" @default.
- W1567762003 title "Study of the decay K<sub>L</sub> → π<sup>±</sup>e<sup>∓</sup>ve<sup>+</sup>e<sup>-</sup> to probe the semileptonic K-π structure" @default.
- W1567762003 doi "https://doi.org/10.2172/892477" @default.
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