Higgs-boson–photon associated production ateēcolliders

Abstract

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.

Radiative Higgs boson decaysH→ff¯γ

“…The diagrams are evaluated using the non-linear gauges discussed in Ref. [2]. In these gauges, the collection of diagrams consists of four separately gauge invariant contributions, the photon pole, the Z pole, Z boxes and W boxes.…”

“…The importance of radiative processes led us to consider the class of decays H → ff γ, where f is a light fermion. The dominant contributions to these decays occur at the one loop level, and their calculation is related to that of the process eē → Hγ, which we recently completed [2,3].…”

Radiative higgs boson decays H {yields} f{anti f}{gamma}

“…The importance of radiative processes led us to consider the class of decays H -+ ffr, where f is a light fermion. The dominant contributions to these decays occur at the one loop level, and their calculation is related to that of the process ee -+ Hy, which we recently completed [2].…”

ProbingCP-violatinght¯tcoupling ine+e<

“…The process e + e − → hγ has been investigated in the SM [50][51][52] and beyond the SM [44,[53][54][55][56][57][58][59]. The tree-level amplitude is suppressed by the small hēe Yukawa coupling and can be safely ignored [51].…”