Four Generations and Higgs Physics
Abstract
In the light of the LHC, we revisit the implications of a fourth generation of chiral matter. We identify a specific ensemble of particle masses and mixings that are in agreement with all current experimental bounds as well as minimize the contributions to electroweak precision observables. Higgs masses between 115-315 (115-750) GeV are allowed by electroweak precision data at the 68% and 95% CL. Within this parameter space, there are dramatic effects on Higgs phenomenology: production rates are enhanced, weak-boson-fusion channels are suppressed, angular distributions are modified, and Higgs pairs can we observed. We also identify exotic signals, such as Higgs decay to same-sign dileptons. Finally, we estimate the upper bound on the cutoff scale from vacuum stability and triviality.
Cite
@article{arxiv.0706.3718,
title = {Four Generations and Higgs Physics},
author = {Graham D. Kribs and Tilman Plehn and Michael Spannowsky and Tim M. P. Tait},
journal= {arXiv preprint arXiv:0706.3718},
year = {2010}
}