https://doi.org/10.1140/epjc/s10052-014-3010-4
Regular Article - Theoretical Physics
Rare decay 
: on corrections beyond the leading order
Faculty of Mathematics and Physics, Institute of Particle and Nuclear Physics, Charles University, V Holešovičkách 2, Praha 8, Czech Republic
* e-mail: karol.kampf@mff.cuni.cz
Received:
29
May
2014
Accepted:
25
July
2014
Published online:
20
August
2014
The preceding experimental and theoretical results on the rare decay are briefly summarized. Already computed two-loop QED corrections are reviewed and the bremsstrahlung contribution beyond the soft-photon approximation is analytically calculated. The possible further contribution of QCD loop corrections is estimated using the leading logarithm approximation. The complete result can be used to fit the value of the contact interaction coupling 
to the recent KTeV experiment with the result 
.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
