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 |
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| Affiliation: | The Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA. |
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| 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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