Upper Limit for the Emission of Monoenergetic Photons in $\Upsilon$ (1s) and $\Upsilon$ (2s) Meson Decays

We report the results of a search for monoenergetic photons in the decay of both theY(1S)- and theY(2S)-meson. Photons converted in the beam tube or the drift chamber inner wall, and photons detected with the barrel shower counters of the ARGUS detector, respectively, have been used in the analysis. No narrow peak is observed in the energy interval 0.5 GeV≦Ey≦4.0 GeV.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
UPSILON(9460): ELECTROPRODUCTION
ELECTROPRODUCTION: UPSILON(9460)
UPSILON(10020): ELECTROPRODUCTION
ELECTROPRODUCTION: UPSILON(10020)
UPSILON(9460): RADIATIVE DECAY
RADIATIVE DECAY: UPSILON(9460)

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Upper Limit for the Emission of Monoenergetic Photons in Υ\UpsilonΥ (1s) and Υ\UpsilonΥ (2s) Meson Decays

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Upper Limit for the Emission of Monoenergetic Photons in $\Upsilon$ (1s) and $\Upsilon$ (2s) Meson Decays