Study of the branching ratio and charge asymmetry for the decay $K(s) \to \pi e \nu$ with the KLOE detector - INSPIRE

DataBETA

Study of the branching ratio and charge asymmetry for the decay $K(s) \to \pi e \nu$ with the KLOE detector

KLOE

Collaboration

•

F. Ambrosino

Jan, 2006

18 pages

Published in:

Phys.Lett.B 636 (2006) 173-182

e-Print:

hep-ex/0601026 [hep-ex]

DOI:

10.1016/j.physletb.2006.03.047

PDG: Re(x

_{-}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

ADS Abstract Service

reference search139 citations

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Abstract: (Elsevier)

Among some 400 million KSKL pairs produced in e+e− annihilations at DAΦNE, ∼6500 each of KS→π+e−ν¯ 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 ΔS=ΔQ rule. From the partial width Γ(KS→πeν) , a value for f+K0(0)×Vus is obtained that is in agreement with unitarity of the quark-mixing matrix. The lepton charge asymmetry AS=(1.5±9.6stat±2.9syst)×10−3 is compatible with the requirements of CPT invariance. The form-factor slope agrees with recent results from semileptonic KL and K+ decays. These are the first measurements of the charge asymmetry and form-factor slope for semileptonic KS decays.

Note:

20 pages, 5 figures, accepted by Phys. Lett. B

electron positron: colliding beams
electron positron: annihilation
Phi(1020): electroproduction
K0: pair production
K0(S): semileptonic decay
K0(S): branching ratio
charge: asymmetry
decay: form factor
form factor: slope
invariance: CPT

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