PT Journal
AU Cappiello, L
   Cata, O
   D'Ambrosio, G
   Gao, DN
TI K+ -> pi(+) pi(0)e(+) e(-): a novel short-distance probe
SO European Physical Journal C
JI Eur. Phys. J. C
PY 2012
BP 1872 - 16pp
VL 72
IS 1
DI 10.1140/epjc/s10052-012-1872-x
LA English
AB 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 (Brems-strahlung, 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(0)e(+) e(-) and discuss the advantages of K+ -> pi(+) pi(0)e(+) e(-) over them.
ER