$K_{S}$ $\to$ $γγ$ at one-loop revisited

Details $K_{S}$ $\to$ $γγ$ at one-loop revisited $K_{S}$ $\to$ $γγ$ at one-loop revisited

2009-07-17

arxiv.org/abs/0907.3044v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages

Scientific paper

We have calculated the decay amplitude for the process $K_{S}$ $\to$ $\gamma \gamma$ at one loop order in chiral perturbation theory. As a new improvement we have included the weak mass term which is only relevant for processes with external fields in the final state. This term was ignored in earlier publications for this decay. We find that the inclusion of $G_{8}^{\prime}$ brings the theoretical decay rate into a good agreement with experiment.

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