Title

Search for rare and forbidden η′ decays

Document Type

Article

Publication Date

1-1-2000

Abstract

We have searched for rare and forbidden decays of the η′ meson in hadronic events at the CLEO II detector. The search is conducted on 4.80 fb of e e collisions at 10.6 GeV center-of-mass energy at the Cornell Electron Storage Ring. We find no signals and set 90% confidence level upper limits of their branching fractions: B(η′→e e η)<2.4×10 , B(η′→e e π )<1.4×10 , B(η′→e e γ)<0.9×10 , and B(η′→eμ)<4.7×10 . We also fit the matrix element of the η′→π π η Dalitz plot with the parametrization |M| =A|1+αy| , where y is a linear function of the kinetic energy of the ηand find Re (α)=−0.021±0.025. © 2000 The American Physical Society. −1 + − + − −3 + − 0 −3 + − −3 −4 + − 2 2

Publication Name

Physical Review Letters

Volume Number

84

First Page

26

Last Page

30

Issue Number

1

DOI

10.1103/PhysRevLett.84.26

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