We present complete analytical expressions for the amplitudes of the process eē → Hγ. The calculation is performed using nonlinear gauges, which significantly simplifies both the actual analytical calculation and the check of its gauge invariance. After comparing our results with a previous numerical calculation, we extend the range of Higgs masses and center of mass energies to those appropriate to LEP 200 and a future linear collider.
Higgs boson radiative decays of the form H → ff γ are calculated in the Standard Model using the complete one-loop expressions for the decay amplitudes. Contributions to the radiative width from leptons and light quarks are given. We also present eē invariant mass distributions for H → eēγ, which illustrate the importance of the photon pole contribution and the effects of the box diagrams.
A general decomposition of the amplitudes for the $2\to 2$ processes
$\gamma\nu\to\gamma\nu$ and $\gamma\gamma\to\nu\bar{\nu}$ is obtained using
gauge invariance and Bose symmetry. The restrictions implied by this
decomposition are investigated for the reaction $\gamma\gamma\to\nu\bar{\nu}$
by computing the one-loop helicity amplitudes in the standard model. In the
center of mass, where $\sqrt{s} = 2\omega$, the cross section grows roughly as
$\omega^6$ up to the threshold for $W$-boson production, $\sqrt{s} = 2m_W$.
Astrophysical implications of very high energy photon-neutrino interactions are
discussed.Comment: 11 pages LaTeX, 4 postscript figures include
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.