Higgs studies in polarized {gamma}{gamma} collisions
- Department of Physics, University of Durham, Durham, DH1 3LE (United Kingdom)
- Department of Physics, University of Durham, Durham, DH13LE (United Kingdom)
The study of an intermediate mass Higgs boson via the process {gamma}{gamma}{r_arrow}H{r_arrow}b{bar b} from an initially polarized J{sub z}=0 state has been advocated as an important feasible goal of a future photon linear collider. The crucial argument was the m{sub b}{sup 2}/s suppression of the background process {gamma}{gamma}(J{sub z}=0){r_arrow}b{bar b}. We critically review the contribution of the radiative background processes (in which the m{sub b}{sup 2}/s suppression is absent) to the quasi-two-jet-like events with at least one, but preferably two, tagged energetic b jets. Within a complete study of the radiative processes, we find that a sizable background contribution can come from the helicity-violating {gamma}{gamma}(J{sub z}=0){r_arrow}b{bar b} process accompanied by soft gluon emission. These latter radiative corrections contain a new type of double logarithmic (DL) terms. We clarify the physical nature of these novel DL corrections. Despite the fact that the one-loop DL terms are comparable or even larger than the Born term, fortunately we find that the calculation of the cross section in the two-loop approximation is sufficient for a reliable evaluation of the background to the Higgs signal. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 531991
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 56; ISSN 0556-2821; ISSN PRVDAQ
- Country of Publication:
- United States
- Language:
- English
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