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- W1567195886 abstract "If high mass $ensuremath{gamma}ensuremath{gamma}$ events observed at CERN LEP are due to the production of a $ensuremath{gamma}ensuremath{gamma}$ resonance via its leptonic coupling, its consequences can be observed at KEK TRISTAN. We find that a predicted $Z$ decay branching rate is too small to account for the observed events if the resonance spin is zero, due to a strong cancellation in the decay amplitudes. Such a cancellation is absent if the resonance has a spin two. We study the consequences of a tensor production in the processes ${e}^{+}{e}^{ensuremath{-}}ensuremath{rightarrow}{e}^{+}{e}^{ensuremath{-}}, {ensuremath{mu}}^{+}{ensuremath{mu}}^{ensuremath{-}}, mathrm{and} ensuremath{gamma}ensuremath{gamma}$ at energies reached at TRISTAN. Complete helicity amplitudes with tensor boson exchange contributions are given, and the signal can clearly be identified from various distributions. TRISTAN experiments are also sensitive to the virtual tensor boson exchange effects, which reduce to the contact interaction terms in the high mass limit." @default.
- W1567195886 created "2016-06-24" @default.
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- W1567195886 date "1993-09-01" @default.
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- W1567195886 title "Consequences of a possible<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>γ</mml:mi><mml:mi>γ</mml:mi></mml:math>resonance at KEK TRISTAN" @default.
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- W1567195886 doi "https://doi.org/10.1103/physrevd.48.1990" @default.
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