Large mass splittings for fourth generation fermions allowed by LHC Higgs exclusion
arXiv:1204.3550 · doi:10.1103/PhysRevD.85.114035
Abstract
In the context of the Standard model with a fourth generation, we explore the allowed mass spectra in the fourth generation quark and lepton sectors as functions of the Higgs mass. Using the constraints from unitarity and oblique parameters, we show that a heavy Higgs allows large mass splittings in these sectors, opening up new decay channels involving W emission. A Higgs heavier than would in fact necessitate either a heavy quark decay channel t'-> b'W/b'-> t' W or a heavy lepton decay channel τ' -> ν' W as long as the mixing between the third and fourth generations is small. This mixing tends to suppress the mass splittings and hence the W-emission channels. The possibility of the W-emission channel could substantially change the search strategies of fourth generation fermions at the LHC and impact the currently reported mass limits.
arXiv comment12 pages, 14 pdf figures, typos corrected, matches published version
References in corpus (54)
- Automatized One-Loop Calculations in 4 and D dimensions
- Combined results of searches for the standard model Higgs boson in pp collisions at sqrt(s) = 7 TeV
- Combined search for the Standard Model Higgs boson using up to 4.9 fb-1 of pp collision data at sqrt(s) = 7 TeV with the ATLAS detector at the LHC
- Four Generations and Higgs Physics
- Extra Families, Higgs Spectrum and Oblique Corrections
- Four Statements about the Fourth Generation
- Less space for a new family of fermions
- How much space is left for a new family?
- Precision Constraints on Extra Fermion Generations
- The fourth family: a simple explanation for the observed pattern of anomalies in B-CP asymmetries
- SM with four generations: Selected implications for rare B and K decays
- Difference in B^+ and B^0 Direct CP Asymmetry as Effect of a Fourth Generation
- Invisible Higgs Boson Decay into Massive Neutrinos of 4th Generation
- Extra generations and discrepancies of electroweak precision data
- Large Time-dependent CP Violation in B_s^0 System and Finite D^0-D^0bar Mass Difference in Four Generation Standard Mode
- Search for Fermion-Pair Decays $Q\Qbar \to (\t\Wmp)(\tbar\Wpm)$ in Same-Charge Dilepton Events
- Two-Loop Electroweak Heavy-Fermion Corrections to Higgs-Boson Production and Decay
- Inclusive search for same-sign dilepton signatures in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
- Mass of the higgs versus fourth generation masses
- Lepton Flavour Violation in the Presence of a Fourth Generation of Quarks and Leptons
- Experimental constraints on fourth generation quark masses
- Search for heavy bottom-like quarks decaying to an electron or muon and jets in collisions at TeV
- Renormalization Group Fixed Point with a Fourth Generation: Higgs-induced Bound States and Condensates
- Constraints on Mass Spectrum of Fourth Generation Fermions and Higgs Bosons
- Constraints on the Four-Generation Quark Mixing Matrix from a Fit to Flavor-Physics Data
- Search for same-sign top-quark production and fourth-generation down-type quarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
- Implication of a Quasi Fixed Point with a Heavy Fourth Generation: The emergence of a TeV-scale physical cutoff
- An extended scalar sector to address the tension between a fourth generation and Higgs searches at the LHC
- Simultaneous Extraction of the Fermi constant and PMNS matrix elements in the presence of a fourth generation
- Dynamical Electroweak Symmetry Breaking with a Heavy Fourth Generation
- Search for a Heavy Bottom-like Quark in pp Collisions at sqrt(s) = 7 TeV
- Complete Electroweak Corrections to Higgs production in a Standard Model with four generations at the LHC
- Once more on extra quark-lepton generations and precision measurements
- Search for a fourth generation t' quark in ppbar collisions at sqrt{s}=1.96 TeV
- Higgs Properties and Fourth Generation Leptons
- Inert Doublet Dark Matter and Mirror/Extra Families after Xenon100
- The Impact of a 4th Generation on Mixing and CP Violation in the Charm System
- Higgs production cross-section in a Standard Model with four generations at the LHC
- Four Generations, Higgs Physics, and the MSSM
- The Fourth Standard Model Family and the Competition in Standart Model Higgs Boson Search at Tevatron and LHC
- Tevatron constraints on the Higgs boson mass in the fourth-generation fermion models revisited
- Additional Fermion Families and Precision Electroweak Data
- Collider signals of a composite Higgs in the Standard Model with four generations
- Four Generations: SUSY and SUSY Breaking
- Impact of the relatively light fourth family neutrino on the Higgs boson search
- Revisiting Constraints on Fourth Generation Neutrino Masses
- Implications of the Stability and Triviality Bounds on the Standard Model with Three and Four Chiral Generations
- A pseudoscalar at the LHC: technicolor vs a fourth family
- Neutrino Masses and a Fourth Generation of Fermions
- Abelian Extension of Standard Model with Four Generations
- Bounds on the mass of the b' quark, revisited
- Fourth generation quark mass limits in CKM-element space
- Conversion With Four Generations
- Theoretical constraints on new generations with and without Quarks or Neutrinos
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- The Physics Programme Of The MoEDAL Experiment At The LHC
- Higgs data confronts Sequential Fourth Generation Fermions in the Higgs Triplet Model
- Closing in on a perturbative fourth generation
- Masses of a Fourth Generation with Two Higgs Doublets
- Higgs data does not rule out a sequential fourth generation with an extended scalar sector
- Chromomagnetic and chromoelectric dipole moments of the top quark in the 4GTHDM
- Confronting the fourth generation two Higgs doublet model with the phenomenology of heavy Higgs bosons
- Fourth generation Majorana neutrino, dark matter and Higgs physics
- Double Higgs boson production as an exclusive probe for a sequential fourth generation with wrong-sign Yukawa couplings
- Indian Contributions to LHC Theory