@article{ef7035497fba4f889c388f123648bf13,
title = "First observation and study of the K± → π±π0e+e− decay",
abstract = "The NA48/2 experiment at CERN reports the first observation of the K±→π±π0e+e− decay from an exposure of 1.7×1011 charged kaon decays recorded in 2003–2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K±→π±π0e+e−)=(4.24±0.14)×10−6. The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.",
author = "{The NA48/2 Collaboration} and Batley, {J. R.} and G. Kalmus and C. Lazzeroni and Munday, {D. J.} and Slater, {M. W.} and Wotton, {S. A.} and R. Arcidiacono and G. Bocquet and N. Cabibbo and A. Ceccucci and D. Cundy and V. Falaleev and M. Fidecaro and L. Gatignon and A. Gonidec and W. Kubischta and A. Maier and A. Norton and M. Patel and A. Peters and S. Balev and Frabetti, {P. L.} and E. Gersabeck and E. Goudzovski and P. Hristov and V. Kekelidze and V. Kozhuharov and L. Litov and D. Madigozhin and M. Misheva and N. Molokanova and I. Polenkevich and Yu Potrebenikov and S. Stoynev and A. Zinchenko and E. Monnier and E. Swallow and R. Winston and P. Rubin and A. Walker and P. Dalpiaz and C. Damiani and M. Fiorini and M. Martini and F. Petrucci and M. Savri{\'e} and M. Scarpa and H. Wahl and W. Baldini and {Cotta Ramusino}, A.",
note = "Publisher Copyright: {\textcopyright} 2018 The Author(s)",
year = "2019",
month = jan,
day = "10",
doi = "10.1016/j.physletb.2018.11.046",
language = "English",
volume = "788",
pages = "552--561",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
}