New results from KLOE
msra(2007)
摘要
The most precise determination of Vus comes from semileptonic kaon decays. We
have measured with the KLOE detector at DAFNE, the Frascati phi-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 Vus/Vud is also presented, based on our precise
measurement of the absolute branching ratio for the decay K -> mu nu (gamma),
combined with lattice results for the ratio f_K/f_pi. New results on CPT
symmetry and quantum mechanics test have also been achieved, which are based on
the first measurement of the charged asymmetry for KS -> pi e nu decay and on
interferometry studies using the phi -> KL KS -> pi+ pi- pi+ pi-.
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