Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-26
Phys.Rev.D76:075016,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 7 figures, REVTeX
Scientific paper
10.1103/PhysRevD.76.075016
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.
Kribs Graham D.
Plehn Tilman
Spannowsky Michael
Tait Tim M. P.
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