Approaching a strong fourth family
arXiv:1001.5321 · doi:10.1016/j.physletb.2010.02.044
Abstract
A heavy fourth family is an example of new physics which is well defined and familiar in some respects, but which nevertheless has radical implications. In particular it eliminates a light Higgs description of electroweak symmetry breaking. We discuss an early signal for heavy quarks at the LHC in the form of an excess of "-jets", and as well show how -jets may be useful in the reconstruction of the heavy quark masses. We argue that fourth family quarks can be distinguished from vector-like quarks of a similar mass at roughly the same time that a same sign lepton signal becomes visible. Given the large mass of the fourth neutrino we describe how a picture for neutrino mass emerges in the absence of right-handed neutrinos, and how it suggests the existence of a remnant flavor gauge symmetry. Based on talk given at "Second Workshop on Beyond 3 Generation Standard Model -- New Fermions at the Crossroads of Tevatron and LHC", January 2010, Taipei Taiwan.
14 pages, 10 figures, references added and slight changes
References in corpus (19)
- PYTHIA 6.4 Physics and Manual
- PYTHIA 6.2 Physics and Manual
- ALPGEN, a generator for hard multiparton processes in hadronic collisions
- MadEvent: Automatic Event Generation with MadGraph
- Four Generations and Higgs Physics
- Extra Families, Higgs Spectrum and Oblique Corrections
- Updated predictions for the total production cross sections of top and of heavier quark pairs at the Tevatron and at the LHC
- Next-to-leading order QCD predictions for W+2j and Z+2j production at the CERN LHC
- Discovering the top partners at the LHC using same-sign dilepton final states
- Extra quark-lepton generations and precision measurements
- t' at the LHC: the physics of discovery
- The discovery of the fourth family at the LHC: what if?
- Using jet mass to discover vector quarks at the LHC
- Renormalization Group Fixed Point with a Fourth Generation: Higgs-induced Bound States and Condensates
- The heavy quark search at the LHC
- Implication of a Quasi Fixed Point with a Heavy Fourth Generation: The emergence of a TeV-scale physical cutoff
- Negative T from a dynamical left-handed neutrino mass
- A Dynamical Origin for the Top Mass
- New Flavor Interactions at the LHC
Cited by in corpus (17)
- Patterns of Flavour Violation in the Presence of a Fourth Generation of Quarks and Leptons
- Search for pair production of heavy top-like quarks decaying to a high-pT W boson and a b quark in the lepton plus jets final state at sqrt(s)=7 TeV with the ATLAS detector
- Chiral Lattice Gauge Theories Via Mirror-Fermion Decoupling: A Mission (im)Possible?
- An extended scalar sector to address the tension between a fourth generation and Higgs searches at the LHC
- Scalar Dark Matter and Standard Model with Four Generations
- A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC
- Fourth Generation Bound States
- The Lepton Sector of a Fourth Generation
- Searches for the of a fourth family
- K_1(1270)-K_1(1400) mixing and the fourth generation SM effects in B-->K_1l^+l^- decays
- The b' search at the LHC
- Three Extra Mirror or Sequential Families: a Case for Heavy Higgs and Inert Doublet
- Neutrino Masses and a Fourth Generation of Fermions
- Detecting Fourth Generation Quarks at Hadron Colliders
- Electroweak Symmetry Breaking From Monopole Condensation
- Higgs Mass Constraints on a Fourth Family: Upper and Lower Limits on CKM Mixing
- Test of the 4-th quark generation from the Cabibbo-Kobayashi-Maskawa matrix