Photon-photon scattering at the Photon Linear Collider is considered. Explicit formulas for helicity amplitudes due to W boson loops are presented. It is shown that photon-photon scattering should be easily observable at PLC and separation of the W loop contribution (which dominates at high energies) will be possible at e + e − c.m. energy of 500 GeV or higher.
We present analytical results for the leading contributions of the top quark to the electroweak ρ parameter at order G 3 F M 6 t and G 2 F M 4 t α s . The Higgs boson and the gauge bosons are taken to be massless in this limit. The correction of order G 3 F M 6 t is found to be sizeable in comparison to the the leading two-loop O(G 2 F M 4 t ) correction, however it is much smaller than the subleading O(G 2 F M 2 t M 2 Z ) correction.
To establish the Higgs mechanism experimentally, one has to determine the Higgs self-interaction potential responsible for the electroweak symmetry breaking. This requires a measurement of the trilinear and quadrilinear self-couplings of the Higgs particle, as predicted by the standard model. We propose that the trilinear Higgs self-coupling be measured in the process ! HH just above the kinematic threshold of 2M H , where M H is the Higgs mass. Our calculation shows that the statistical sensitivity of the cross section !HH to the Higgs self-coupling is maximal near the 2M H threshold for M H between 115 and 150 GeV, and is larger than the statistical sensitivities of e e ÿ !ZHH and e e ÿ ! HH to this coupling for 2E e 700 GeV.
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