CP-Conserving Contribution in the Decays KL-> and KL-> e+ e-
نویسندگان
چکیده
منابع مشابه
The CP Conserving Contribution to KL → πνν̄ in the Standard Model
The rare decay KL → πνν̄ is dominated by direct CP violation and can be computed with extraordinarily high precision. In principle also a CP conserving contribution to this process can arise within the Standard Model. We clarify the structure of the CP conserving mechanism, analyzing both its short-distance and long-distance components. It is pointed out that the calculation of the CP conserving...
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I review the theoretical basis of the prediction that the decay KL → π+π−e+e− should show a large CP and T -violation, a prediction now confirmed by the KTeV experiment. The genesis of the effect lies in a large violation of CP and T -invariance in the decay KL → π+π−γ, which is encrypted in the polarization state of the photon. The decay KL → π+π−e+e− serves as an analyser of the photon polari...
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We report on a search for the decay KL → πee carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the CKM mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06 ± 0.41 events, and we set a...
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The decay rate of the neutral long-lived K meson into the e+e−e+e− final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1999, a total of 132 events has been observed with negligible background. The total number of kaons was determined to be 5.1 × 1010. This observation corresponds to a preliminary branching ratio of Γ(KL → eeee)/Γ(KL → all) = (3.67 ± 0.3...
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The phases of terms of amplitude that arise from the ππ interaction are obtained by using a simple realistic model of ππ interaction via virtual ρ-meson, instead of the ChPT. It is shown that the standard ChPT approach cannot reproduce the contribution of the ρ-meson to the ππ interaction. It is shown that the interference between the terms of amplitude with different CP-parity appears only whe...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1989
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.82.371