Search for rare and forbidden η′ decays

CLEO Collaboration

Research output: Contribution to journalArticle

25 Citations (Scopus)

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−1 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+eη)<2.4×10−3, B(η′→e+eπ0)<1.4×10−3, B(η′→e+eγ)<0.9×10−3, and B(η′→eμ)<4.7×10−4. We also fit the matrix element of the η′→π+πη Dalitz plot with the parametrization |M|2=A|1+αy|2, where y is a linear function of the kinetic energy of the ηand find Re (α)=−0.021±0.025.

Original languageEnglish
Pages (from-to)26-30
Number of pages5
JournalPhysical Review Letters
Volume84
Issue number1
DOIs
Publication statusPublished - 2000 Jan 1

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center of mass
confidence
mesons
plots
kinetic energy
collisions
detectors
decay
matrices
electrons
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

CLEO Collaboration. / Search for rare and forbidden η′ decays. In: Physical Review Letters. 2000 ; Vol. 84, No. 1. pp. 26-30.
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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−1 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)<2.4×10−3, B(η′→e+e−π0)<1.4×10−3, B(η′→e+e−γ)<0.9×10−3, and B(η′→eμ)<4.7×10−4. We also fit the matrix element of the η′→π+π−η Dalitz plot with the parametrization |M|2=A|1+αy|2, where y is a linear function of the kinetic energy of the ηand find Re (α)=−0.021±0.025.",
author = "{CLEO Collaboration} and Briere, {R. A.} and Behrens, {B. H.} and Ford, {W. T.} and A. Gritsan and H. Krieg and J. Roy and Smith, {J. G.} and Alexander, {J. P.} and R. Baker and C. Bebek and Berger, {B. E.} and K. Berkelman and F. Blanc and V. Boisvert and Cassel, {D. G.} and M. Dickson and {von Dombrowski}, S. and Drell, {P. S.} and Ecklund, {K. M.} and R. Ehrlich and Foland, {A. D.} and P. Gaidarev and Galik, {R. S.} and L. Gibbons and B. Gittelman and Gray, {S. W.} and Hartill, {D. L.} and Heltsley, {B. K.} and Hopman, {P. I.} and Jones, {C. D.} and Kreinick, {D. L.} and T. Lee and Y. Liu and Meyer, {T. O.} and Mistry, {N. B.} and Ng, {C. R.} and E. Nordberg and Patterson, {J. R.} and D. Peterson and D. Riley and Thayer, {J. G.} and Thies, {P. G.} and B. Valant-Spaight and A. Warburton and P. Avery and M. Lohner and C. Prescott and Rubiera, {A. I.} and J. Yelton and Youngjoon Kwon",
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Search for rare and forbidden η′ decays. / CLEO Collaboration.

In: Physical Review Letters, Vol. 84, No. 1, 01.01.2000, p. 26-30.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Search for rare and forbidden η′ decays

AU - CLEO Collaboration

AU - Briere, R. A.

AU - Behrens, B. H.

AU - Ford, W. T.

AU - Gritsan, A.

AU - Krieg, H.

AU - Roy, J.

AU - Smith, J. G.

AU - Alexander, J. P.

AU - Baker, R.

AU - Bebek, C.

AU - Berger, B. E.

AU - Berkelman, K.

AU - Blanc, F.

AU - Boisvert, V.

AU - Cassel, D. G.

AU - Dickson, M.

AU - von Dombrowski, S.

AU - Drell, P. S.

AU - Ecklund, K. M.

AU - Ehrlich, R.

AU - Foland, A. D.

AU - Gaidarev, P.

AU - Galik, R. S.

AU - Gibbons, L.

AU - Gittelman, B.

AU - Gray, S. W.

AU - Hartill, D. L.

AU - Heltsley, B. K.

AU - Hopman, P. I.

AU - Jones, C. D.

AU - Kreinick, D. L.

AU - Lee, T.

AU - Liu, Y.

AU - Meyer, T. O.

AU - Mistry, N. B.

AU - Ng, C. R.

AU - Nordberg, E.

AU - Patterson, J. R.

AU - Peterson, D.

AU - Riley, D.

AU - Thayer, J. G.

AU - Thies, P. G.

AU - Valant-Spaight, B.

AU - Warburton, A.

AU - Avery, P.

AU - Lohner, M.

AU - Prescott, C.

AU - Rubiera, A. I.

AU - Yelton, J.

AU - Kwon, Youngjoon

PY - 2000/1/1

Y1 - 2000/1/1

N2 - 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−1 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)<2.4×10−3, B(η′→e+e−π0)<1.4×10−3, B(η′→e+e−γ)<0.9×10−3, and B(η′→eμ)<4.7×10−4. We also fit the matrix element of the η′→π+π−η Dalitz plot with the parametrization |M|2=A|1+αy|2, where y is a linear function of the kinetic energy of the ηand find Re (α)=−0.021±0.025.

AB - 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−1 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)<2.4×10−3, B(η′→e+e−π0)<1.4×10−3, B(η′→e+e−γ)<0.9×10−3, and B(η′→eμ)<4.7×10−4. We also fit the matrix element of the η′→π+π−η Dalitz plot with the parametrization |M|2=A|1+αy|2, where y is a linear function of the kinetic energy of the ηand find Re (α)=−0.021±0.025.

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U2 - 10.1103/PhysRevLett.84.26

DO - 10.1103/PhysRevLett.84.26

M3 - Article

VL - 84

SP - 26

EP - 30

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

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