Fermionic effective operators and Higgs production at a linear collider
We study the possible contributions of dimension six operators containing fermion fields to Higgs production at a 500 GeV or 1 TeV e+e- linear collider. We show that—depending on the production mechanism—the effects of such operators can be kinematically enhanced relative to standard model (SM) contributions. We determine constraints on the operator coefficients implied by existing precision electroweak measurements and the scale of neutrino mass. We find that even in the presence of such constraints, substantial deviations from SM Higgs production cross sections are possible. We compare the effects of fermionic operators with those associated with purely bosonic operators that have been previously discussed in the literature.
Additional Information© 2007 The American Physical Society. (Received 29 June 2007; published 28 September 2007) The authors are particularly indebted to J. Erler for making the GAPP code available and for several helpful discussions about fits to electroweak precision observables. We also thank V. Barger, N. Bell, V. Cirigliano, M. Gorshteyn, T. Han, P. Langacker, P. Vogel, B. Grinstein, S. Mantry, and M. Wise for helpful discussions and comments. This work was supported in part under U.S. Department of Energy Contracts Nos. FG02-05ER41361 and DE-FG03-ER40701 and National Science Foundation Grant No. PHY-0555674.
Published - KILprd07.pdf