Consequences of a Possible Di-Gamma Resonace at TRISTAN

Details Consequences of a Possible Di-Gamma Resonace at TRISTAN Consequences of a Possible Di-Gamma Resonace at TRISTAN

1993-02-22

arxiv.org/abs/hep-ph/9302285v1

Phys.Rev.D48:1990-1999,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages in revtex, 7 figures (not included) available upon request, KEK-TH-353

Scientific paper

10.1103/PhysRevD.48.1990

If high mass di-gamma events observed at LEP are due to the production of a di-gamma resonance via its leptonic coupling, its consequences can be observed at 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 $e^+e^- \to e^+e^-$, $\mu^+\mu^-$ and $\gamma\,\gamma$ at TRISTAN energies. 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.

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