Value of the ξ parameter in Kl3 decay from the pion-gauge condition
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Date
1972
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Abstract
It is shown with the help of the pion-gauge condition that the divergence of the most general boson current in
K
l
3
decay vanishes in the limit of zero four-momentum of the pion. This in turn implies
ξ
=
−
1
at the (unphysical) point
t
=
m
2
K
. Inasmuch as
ξ
does not seem, experimentally, to vary much with
t
, the result is significant in the physical region and agrees with experiment.