WWV ( V=γ , Z ) vertex in the Georgi-Machacek model

Abstract

The CP-even static form factors ∆κ V and ∆QV (V = γ, Z) associated with the W W V vertex are studied in the context of the Georgi-Machacek model (GMM), which predicts nine new scalar bosons accommodated in a singlet, a triplet and a fiveplet. General expressions for the one-loop contributions to ∆κ V and ∆QV arising from neutral, singly and doubly charged scalar bosons are obtained in terms of both parametric integrals and Passarino-Veltman scalar functions, which can be numerically evaluated. It is found that the GMM yields 15 (28) distinct contributions to ∆κ γ and ∆Qγ (∆κ Z and ∆QZ ), though several of them are naturally suppressed. A numerical analysis is done in the region of parameter space still consistent with current experimental data and it is found that the largest contributions to ∆κ V arise from Feynman diagrams with two nondegenerate scalar bosons in the loop, with values of the order of a = g 2 /(96π 2 ) reached when there is a large splitting between the masses of these scalar bosons. As for ∆QV , it reaches values as large as 10 −2 a for the lightest allowed scalar bosons, but it decreases rapidly as one of the masses of the scalar bosons becomes large. Among the new contributions of the GMM to the ∆κ V and ∆QV form factors are those induced by the H ± 5 W ∓ Z vertex, which arises at the tree-level and is a unique prediction of this model.

Perturbativity constraints in BSM models

“…The model known today as the 'Georgi-Machacek' (GM) model comes with one complex and one real triplet. Many aspects of the GM model were studied in detail in the last years like the properties of the couplings of scalars [8][9][10][11][12][13][14][15][16][17][18] or vector bosons [19], or the potential signatures at colliders [20][21][22][23][24][25][26][27][28]. Not only the phenomenological consequences of the new states were explored, but also the theoretical properties of the extended Higgs sector were studied.…”

“…Figure19. Fraction of those points out of the parameter scan which are stable at one-loop and also pass the tree-level constraints.…”

Unravelling the anomalous gauge boson couplings in ZW± production at the LHC and the role of spin-1 polarizations

“…(1.4) are labelled as c O i , c L i , and c L g i , respectively. These anomalous gauge boson self couplings may be obtained from some high scale new physics such as MSSM [11][12][13], extra dimension [14,15], Georgi-Machacek model [16], etc. by integrating out the heavy degrees of freedom.…”

Probing the anomalous triple gauge boson couplings in e+e−→W+W− using WRahaman1, Singh2 2020Phys. Rev. D170100View full textAdd to dashboardCite

“…4) in SU(2) × U(1) gauge for e + -e − linear collider [12,[14][15][16][17][18][19][20][21][22][23][24], Large Hadron electron collider (LHeC) [25,26], e-γ collider [27], hadron collider (LHC) [21,22,[28][29][30][31][32][33][34]. These couplings has also been addressed from loop level contri-bution [16] and Georgi-Machacek model [35]. Some CPviolating WWV couplings has been studied in Ref.s [24,34].…”