MEASURING THE RARE DECAYS K+ YIELDS P+VV- AND K0L YIELDS P0VV-. Page: 4 of 24
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ZKL v \
(0,0) (1,0)
Figure 1: The unitarity triangle.
sector will be possible.
2 Phenomenology of K -+ 7ruv.
K+ - 7r+vv is a flavor-changing neutral current process, arising at the one
loop level in the SM as shown in Fig. 2. The presence of the top quark in
s W_ d d s c 1 d
u, t )
Z
Figure 2: The leading electroweak diagrams inducing K -+ irvv decays. For
KL -+ Orvv only the top quark contributes.
the loops makes this decay very sensitive to the modulus of the elusive CKM
coupling Vd [3]. Moreover, this sensitivity can be fully exploited because of
the hard GIM suppression, the relatively small QCD corrections (which have
been calculated to next-to-leading-logarithmic order [4]), and the fact that
the normally problematic hadronic matrix element can be determined to a3
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DIWAN,M.V. MEASURING THE RARE DECAYS K+ YIELDS P+VV- AND K0L YIELDS P0VV-., article, March 3, 2002; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc737103/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.