Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/67400
Type: Artigo de periódico
Title: First observation of K-L ->pi(+/-)e(-/+)nu e(+)e(-)
Author: Abouzaid, E
Arenton, M
Barker, AR
Bellantoni, L
Blucher, E
Bock, GJ
Cheu, E
Coleman, R
Corcoran, MD
Cox, B
Erwin, AR
Escobar, CO
Glazov, A
Golossanov, A
Gomes, RA
Gouffon, P
Hsiung, YB
Jensen, DA
Kessler, R
Kotera, K
Ledovskoy, A
McBride, PL
Monnier, E
Nelson, KS
Nguyen, H
Niclasen, R
Phillips, DG
Ping, H
Ramberg, EJ
Ray, RE
Ronquest, M
Santos, E
Slater, W
Smith, D
Solomey, N
Swallow, EC
Toale, PA
Tschirhart, R
Velissaris, C
Wah, YW
Wang, J
White, HB
Whitmore, J
Wilking, MJ
Winstein, B
Winston, R
Worcester, ET
Worcester, M
Yamanaka, T
Zimmerman, ED
Zukanovich, RF
Abstract: This Letter is the first report of the K-L ->pi(+/-)e(-/+)nu e(+)e(-) decay. Based on 19 208 +/- 144 events, we determine the branching fraction, B(K-L ->pi(+/-)e(-/+)nu e(+)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.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.99.081803
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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