Please use this identifier to cite or link to this item:
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
Citation: Physical Review Letters. Amer Physical Soc, v. 99, n. 8, 2007.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.99.081803
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
WOS000248984900009.pdf335.35 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.