$K_L \ra μ^\pm e^\mp ν\overlineν$ as background to $K_L \ra μ^\pm e^\mp$

Details $K_L \ra μ^\pm e^\mp ν\overlineν$ as background to $K_L \ra μ^\pm e^\mp$ $K_L \ra μ^\pm e^\mp ν\overlineν$ as background to $K_L \ra μ^\pm e^\mp$

1993-02-25

arxiv.org/abs/hep-ph/9302309v1

Phys.Rev. D48 (1993) 209-211

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX, 1 figure appended as postscript file after \end{document}. Fermilab-Pub-93/024-T

Scientific paper

10.1103/PhysRevD.48.209

We consider the process $K_L \ra \mu^\pm e^\mp \nu \overline{\nu}$ at next to leading order in chiral perturbation theory. This process occurs in the standard model at second order in the weak interaction and constitutes a potential background in searches for new physics through the modes $K_L \ra \mu^\pm e^\mp$. We find that the same cut, $M_{\mu e}>489$~MeV, used to remove the sequential decays $K_{l3}\ra \pi_{l2}$ pushes the $B(K_L \ra \mu^\pm e^\mp \nu \overline{\nu})$ to the $10^{-23}$ level, effectively removing it as a background.

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