Early LHC phenomenology of Yukawa-bound heavy QQ mesons

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.094013· OSTI ID:21608019

Enkhbat, Tsedenbaljir ^[1]; Hou, Wei-Shu; Yokoya, Hiroshi ^[1]

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1. Department of Physics, National Taiwan University, Taipei, Taiwan 10617 (China)

Current limits from the LHC on fourth generation quarks are already at the unitarity bound of 500 GeV or so. If they exist, the strong Yukawa couplings are turning nonperturbative, and may form bound states. We study the domain of m{sub b'} and m{sub t'} in the range of 500 to 700 GeV, where we expect binding energies are mainly of Yukawa origin, with QCD subdominant. To be consistent with electroweak precision tests, the t' and b' quarks have to be nearly degenerate, exhibiting a new 'isospin'. Comparing relativistic expansion with a relativistic bound state approach, we find the most interesting is the production of a color octet, isosinglet vector meson (a 'gluon-prime') via qq-bar{yields}{omega}{sub 8}. Leading decay modes are {pi}{sub 8}{sup {+-}}W{sup {+-}}, {pi}{sub 8}{sup 0}Z{sup 0}, and constituent quark decay, with qq and tt-bar' and bb' subdominant. The color octet, isovector pseudoscalar {pi}{sub 8} meson decays via constituent quark decay, or to Wg. These decay rates are parameterized by the decay constant, the binding energy and mass differences, and V{sub tb'}. For small V{sub t'b}, one could have a spectacular signal of WWg, where a soft W accompanies a very massive Wg pair. In general, however, one has high multiplicity signals with b, W, and t jet substructures that are not so different from the t't-bar' and b'b-bar' search.

• OSTI ID: 21608019
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 9; Other Information: DOI: 10.1103/PhysRevD.84.094013; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BINDING ENERGY
BOUND STATE
CERN LHC
COLOR MODEL
GEV RANGE 100-1000
GLUONS
ISOVECTORS
MASS DIFFERENCE
MULTIPLICITY
PARTICLE DECAY
PARTICLE PRODUCTION
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
QUARKS
RELATIVISTIC RANGE
VECTOR MESONS
WEINBERG-SALAM GAUGE MODEL
YUKAWA POTENTIAL
ACCELERATORS
BOSONS
COMPOSITE MODELS
CYCLIC ACCELERATORS
DECAY
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
HADRONS
MATHEMATICAL MODELS
MESONS
NUCLEAR POTENTIAL
PARTICLE MODELS
PARTICLE PROPERTIES
POTENTIALS
QUANTUM FIELD THEORY
QUARK MODEL
STORAGE RINGS
SYNCHROTRONS
TENSORS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
VECTORS