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Type: Artigo de periódico
Title: Measurement of the rare decay pi(0)-> e(+)e(-)
Author: Abouzaid, E
Arenton, M
Barker, AR
Bellantoni, L
Bellavance, A
Blucher, E
Bock, GJ
Cheu, E
Coleman, R
Corcoran, MD
Cox, B
Erwin, AR
Escobar, CO
Glazov, A
Golossanov, A
Gomes, RA
Gouffon, P
Hanagaki, K
Hsiung, YB
Huang, H
Jensen, DA
Kessler, R
Kotera, K
Ledovskoy, A
McBride, PL
Monnier, E
Nelson, KS
Nguyen, H
Niclasen, R
Phillips, DG
Ping, H
Qi, XR
Ramberg, EJ
Ray, RE
Ronquest, M
Santos, E
Shields, J
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: The branching ratio of the rare decay pi(0)-> e(+)e(-) has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate pi(0)-> e(+)e(-) events using K-L -> 3 pi(0) as a source of tagged pi(0)s. The expected background is 52.7 +/- 11.2 events, predominantly from high e(+)e(-) mass pi(0)-> e(+)e(-)gamma decays. We have measured B(pi(0)-> e(+)e(-),(m(e)(+)e(-)/m(pi)(0))(2)> 0.95)=(6.44 +/- 0.25(stat)+/- 0.22(syst))x10(-8), which is above the unitary bound from pi(0)->gamma gamma and within the range of theoretical expectations from the standard model.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review D. American Physical Soc, v. 75, n. 1, 2007.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.75.012004
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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