On the short distance constraints from K(L,S) ---> mu+ mu- - INSPIRE

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On the short distance constraints from K(L,S) ---> mu+ mu-

Gino Isidori
(
- Frascati
)
,
Rene Unterdorfer
(
- Frascati and
- Vienna U.
)

Oct, 2003

16 pages

Published in:

JHEP 01 (2004) 009

e-Print:

hep-ph/0311084 [hep-ph]

DOI:

10.1088/1126-6708/2004/01/009

View in:

ADS Abstract Service

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Abstract:

Motivated by new precise results on several

K_L

decays, sensitive to the

{K_L \to \gamma \gamma}

form factor, we present a new analysis of the

K_L\to \mu^+\mu^-

long-distance amplitude based on a semi-phenomenological approach. Particular attention is devoted to the evaluation of the uncertainties of this method and to the comparison with alternative approaches. Our main result is a conservative upper bound of

2.5 \times 10^{-9}

on

B(K_L \to \mu^+ \mu^-)_{\rm short}

, which is compatible with the SM expectation and which provides significant constraints on new-physics scenarios. The possibility to extract an independent short-distance information from future searches on

K_S \to \mu^+ \mu^-

is also briefly discussed.

K0(L): leptonic decay
K0(S): leptonic decay
amplitude analysis: short-distance behavior
Feynman graph: higher-order
K0(L): branching ratio
K0(L): radiative decay
decay: form factor
quantum chromodynamics: perturbation theory
numerical calculations
K0(L) --> muon+ muon-

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Figures(0)

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