Fourth Generation Bound States

Abstract

We investigate the spectrum and wave functions of {\bar q}'q' bound states for heavy fourth generation quarks (q') that have a very small mixing with the three observed generations of standard model quarks. Such bound states come with different color, spin and flavor quantum numbers. Since the fourth generation Yukawa coupling, λ_{q'}, is large we include all perturbative corrections to the potential between the heavy quark and antiquark of order λ_{q'}^2N_c/16π^2 where N_c is the number of colors, as well as relativistic corrections suppressed by (v/c)^2. We find that the lightest fourth generation quark masses for which a bound state exists for color octet states. For the the color singlet states, which always have a bound state, we analyze the influence that the Higgs couplings have on the size and binding energy of the bound states.

9 pages, 9 figures; published version

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Cited by in corpus (14)

• Two Higgs doublets with 4th generation fermions - models for TeV-scale compositeness
• Inert Doublet Dark Matter and Mirror/Extra Families after Xenon100
• Closing in on a perturbative fourth generation
• Early LHC Phenomenology of Yukawa-bound Heavy Q\bar{Q} Mesons
• The 125 GeV Higgs in the context of four generations with 2 Higgs doublets
• Neutrino dark matter candidate in fourth generation scenarios
• Electroweak Constraints on the Fourth Generation at Two Loop Order
• The Need for New Search Strategies for Fourth Generation Quarks at the LHC
• Neutrino Masses and a Fourth Generation of Fermions
• Two heavy fermions bound via Higgs boson exchange
• Masses and decay constants of bound states containing fourth family quarks from QCD sum rules
• Doubly resonant WW plus jet signatures at the LHC
• Natural Four-Generation Mass Textures in MSSM Brane Worlds
• Decays of Fourth Generation Bound States