Four generations and Higgs physics

被引：328

作者：

Kribs, Graham D. ^{[1
]}

Plehn, Tilman ^{[2
]}

Spannowsky, Michael ^{[3
]}

Tait, Tim M. P. ^{[4
]}

机构：

[1] Univ Oregon, Inst Theoret Sci, Dept Phys, Eugene, OR 97403 USA

[2] Univ Edinburgh, Sch Phys, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland

[3] Univ Munich, Dept Phys, ASC, D-80333 Munich, Germany

[4] Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW D | 2007年 / 76卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.76.075016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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% C.L. 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 be 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.

引用

页数：11

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