K^+ -> pi^+pi^0e^+e^-: a novel short-distance probe
Abstract
We study the decay K^+ -> pi^+ pi^0 e^+ e^-, currently under analysis by the NA62 Collaboration at CERN. In particular, we provide a detailed analysis of the Dalitz plot for the long-distance, gamma^*-mediated, contributions (Bremsstrahlung, direct emission and its interference). We also examine a set of asymmetries to isolate genuine short-distance effects. While we show that charge asymmetries are not required to test short distances, they provide the best environment for its detection. This constitutes by itself a strong motivation for NA62 to study K^- decays in the future. We therefore provide a detailed study of different charge asymmetries and the corresponding estimated signals. Whenever possible, we make contact with the related processes K^+ -> pi^+ pi^0 gamma and K_L -> pi^+ pi^- e^+ e^- and discuss the advantages of K^+ -> pi^+ pi^0 e^+ e^- over them.
Keywords
Cite
@article{arxiv.1112.5184,
title = {K^+ -> pi^+pi^0e^+e^-: a novel short-distance probe},
author = {Luigi Cappiello and Oscar Cata and Giancarlo D'Ambrosio and Dao-Neng Gao},
journal= {arXiv preprint arXiv:1112.5184},
year = {2015}
}
Comments
25 pages, 6 figures