Tests of Chiral Perturbation Theory in Rare Kaon Decays
Rainer Wanke (University of Mainz)
TL;DR
This paper presents new experimental measurements of rare Kaon decays that test the predictions of Chiral Perturbation Theory, highlighting the importance of higher-order effects in these processes.
Contribution
It provides the first precise measurements of Kl->gamma gamma and an upper limit for Ks->pi0 gamma gamma, demonstrating the significance of O(p^6) contributions in ChPT.
Findings
ChPT contributions of O(p^6) are significant in these decays
New measurements of Kl->gamma gamma align with theoretical predictions
Upper limit set for Ks->pi0 gamma gamma decay rate
Abstract
The neutral Kaon decays Ks->gamma gamma and Kl->pi0 gamma gamma are very sensitive to higher order loop effects of Chiral Perturbation Theory (ChPT). New measurements of the NA48 experiment show that ChPT contributions of O(p^6) cannot be neglected in these modes. In addition a new measurement of the related decay Kl->gamma gamma and an upper limit of the rate of Ks->pi0 gamma gamma are presented.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research · Particle physics theoretical and experimental studies