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First observation of K{L}-->pi{+/-}e{-/+}nue{+}e{-} |
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| Authors: | Abouzaid E Arenton M Barker A R Bellantoni L Blucher E Bock G J Cheu E Coleman R Corcoran M D Cox B Erwin A R Escobar C O Glazov A Golossanov A Gomes R A Gouffon P Hsiung Y B Jensen D A Kessler R Kotera K Ledovskoy A McBride P L Monnier E Nelson K S Nguyen H Niclasen R Phillips D G Ping H Ramberg E J Ray R E Ronquest M Santos E Slater W Smith D Solomey N Swallow E C Toale P A Tschirhart R Velissaris C Wah Y W Wang J White H B Whitmore J Wilking M J Winstein B Winston R Worcester E T Worcester M Yamanaka T Zimmerman E D Zukanovich R F;KTeV Collaboration |
| Institution: | The Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA. |
| Abstract: | This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=4.57+/-0.04(stat)+/-0.14(syst)]x10{-5}. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree with those predicted by just ChPT O(p{4}), but show significant disagreement with ones predicted by leading-order ChPT. |
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