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Type: Artigo de periódico
Title: Measurement Of The Rare Decay π0→e+e-
Author: Abouzaid E.
Arenton M.
Barker A.R.
Bellantoni L.
Bellavance A.
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.
Hanagaki K.
Hsiung Y.B.
Huang H.
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.
Qi X.R.
Ramberg E.J.
Ray R.E.
Ronquest M.
Santos E.
Shields J.
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.
Abstract: The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model. © 2007 The American Physical Society.
Citation: Physical Review D - Particles, Fields, Gravitation And Cosmology. , v. 75, n. 1, p. - , 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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