Triple electroweak gauge-boson production at Fermilab Tevatron energies.

We calculate the three gauge-boson production in the Standard Model at Fermilab Tevatron energies. At √ s = 2 TeV in pp̄ collisions, the cross sections for the triple gauge-boson production are typically of order 10 femtobarns (fb). For the pure leptonic final states from the gauge-boson decays and with some minimal cuts on final state photons, the cross sections for pp̄→ W±γγ, Zγγ and W+W−γ processes are of order a few fb, resulting in a few dozen clean leptonic events for an integrated luminosity of 10 fb−1. The pure leptonic modes from other gauge-boson channels give significantly smaller rate. Especially, the trilepton modes from W+W−W± and tt̄W± → W+W−W± yield a cross section of order 0.1 fb if there is no significant Higgs boson contribution. For a Higgs boson with mH ' 2MZ , the triple massive-gauge-boson production rate could be enhanced by a factor of 4− 6. ∗e-mail: [email protected] †e-mail: [email protected]