|Vus | AND KS DECAYS FROM KLOE THE KLOE COLLABORATION a
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KAON PHYSICS AT KLOE THE KLOE COLLABORATION a
The most precise determination of Vus comes from semileptonic kaon decays. We have measured with the KLOE detector at DAΦNE, the Frascati φ factory, all the experimental inputs to Vus for both neutral and charged kaons. Using our results we extract the value of Vus with ∼ 0.9% fractional error, which is entirely dominated by the theoretical error on the knowledge of the normalization of the dec...
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All relevant inputs for the extraction of the CKMmatrix element Vus fromKL, KS and K ± decays have been measured at KLOE. From a global fit using only KLOE results, but KS lifetime, a value of |Vus|f+(0) = 0.2157 ± 0.0006 is obtained, where f+(0) is the form factor parametrizing the hadronic matrix element evaluated at zero momentum transfer. Comparison of the values of f+(0) Vus for Ke3 and Kμ...
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The most precise determination of Vus comes from semileptonic kaon decays. We have measured with the KLOE detector at DAΦNE, the Frascati φ-factory, all the experimental inputs to Vus for both neutral and charged kaons. Using our results we extract the value of Vus with 0.9% fractional error, which is dominated by the theoretical error on the form factor, f+(0). A new determination of the ratio...
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The most recent progress and future prospects in kaon physics are reviewed. Main results are the first observation of the rare decays KS → π ee and KS → π μμ by NA48, newK → πνν event observed by E949 and new precision measurements of KS,L → πeν decays by KTeV, KLOE and NA48 made in an effort to resolve the slight deviation from the unitarity in the CKM matrix, involving the |Vus| coupling.
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Among some 400 million KSKL pairs produced in e +e− annihilations at DAΦNE, ∼ 6500 each of KS→π +e−ν̄ and KS→π −e+ν decays have been observed with the KLOE detector. From these, the ratio Γ(KS → πeν)/Γ(KS → π +π−) = (10.19 ± 0.13) × 10−4 is obtained, improving the accuracy on BR(KS → πeν) by a factor of four and providing the most precise test of the ∆S=∆Q rule. From the partial width Γ(KS → πeν...
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تاریخ انتشار 2005