Dynamical Electroweak Symmetry Breaking with Color-Sextet Quarks

Lattice QCD study of generalized gluelumps

“…New strong dynamics would generate a spectrum of new composite particles (recall the technihadrons of classic technicolor), and if the new elementary particles (akin to techniquarks) carry QCD color, then the new composite particles occur as octets, decuplets, and other multiplets of QCD color. Studies of new colored particles in the context of the Large Hadron Collider therefore go far beyond triplets and octets [1][2][3][4][5][6][7], continuing several decades of interest in the range of color representations that might be realized beyond the standard model [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

One-loop chiral perturbation theory with two fermion representations

“…Within the Standard Model, all of the quarks transform in the fundamental representation of the QCD group SU(3) c . However, exotic fermions in higher irreducible representations (irreps) of SU(3) c have long been considered an intriguing possibility for physics beyond the Standard Model, with a potentially rich phenomenology [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. More generally, fermions in multiple representations of a strongly-coupled gauge group can appear in other extensions of the Standard Model, including composite Higgs [20][21][22] and composite dark matter [23] models.…”

Simulation of sextet diquark production

“…Many models of Beyond the Standard Model (BSM) physics require the inclusion of diquarks. For example, diquarks appear in a number of Grand Unified Theories (GUTs) and have even been postulated as a form of dynamical symmetry breaking, giving rise to the masses of particles, [1,2]. The colour sextet diquark is, in group theory language, a rank 2 symmetric tensor formed from the direct product of two fundamental representations 3 ⊗ 3 = 6 ⊕ 3.…”