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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - First observation and study of the K ± → π ± π 0 e + e − decay
AU - The NA48/2 Collaboration
AU - Batley, J. R.
AU - Kalmus, G.
AU - Lazzeroni, C.
AU - Slater, M. W.
AU - Wotton, S. A.
AU - Arcidiacono, R.
AU - Bocquet, G.
AU - Cabibbo, N.
AU - Ceccucci, A.
AU - Cundy, D.
AU - Falaleev, V.
AU - Fidecaro, M.
AU - Gatignon, L.
AU - Gonidec, A.
AU - Kubischta, W.
AU - Maier, A.
AU - Norton, A.
AU - Patel, M.
AU - Balev, S.
AU - Frabetti, P. L.
AU - Gersabeck, E.
AU - Goudzovski, E.
AU - Hristov, P.
AU - Kekelidze, V.
AU - Kozhuharov, V.
AU - Litov, L.
AU - Madigozhin, D.
AU - Misheva, M.
AU - Molokanova, N.
AU - Polenkevich, I.
AU - Potrebenikov, Yu
AU - Stoynev, S.
AU - Zinchenko, A.
AU - Monnier, E.
AU - Winston, R.
AU - Rubin, P.
AU - Dalpiaz, P.
AU - Damiani, C.
AU - Fiorini, M.
AU - Martini, M.
AU - Petrucci, F.
AU - Savrié, M.
AU - Scarpa, M.
AU - Wahl, H.
AU - Baldini, W.
AU - Cotta Ramusino, A.
AU - Gianoli, A.
AU - Calvetti, M.
AU - Celeghini, E.
AU - Ruggiero, G.
PY - 2019/1/10
Y1 - 2019/1/10
N2 - The NA48/2 experiment at CERN reports the first observation of the K ± →π ± π 0 e + e − decay from an exposure of 1.7×10 11 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 ± π 0 e + 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.
AB - The NA48/2 experiment at CERN reports the first observation of the K ± →π ± π 0 e + e − decay from an exposure of 1.7×10 11 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 ± π 0 e + 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.
U2 - 10.1016/j.physletb.2018.11.046
DO - 10.1016/j.physletb.2018.11.046
M3 - Journal article
AN - SCOPUS:85058955739
VL - 788
SP - 552
EP - 561
JO - Physics Letters B
JF - Physics Letters B
SN - 0370-2693
ER -