Changes between Version 3 and Version 4 of GeorgiMachacekModel


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Timestamp:
11/07/14 19:55:31 (6 years ago)
Author:
kkumar84
Comment:

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  • GeorgiMachacekModel

    v3 v4  
    44'''Model Description and Implementation'''
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    6 The Georgi-Machacek (GM) model was proposed in 1985 [G,M paper] as a plausible scenario for EWSB with interesting collider signatures. In this model, the scalar sector of the Standard Model (SM) is extended by the addition of one complex and one real SU(2) triplet. The hypercharge assignments of the triplets allows for a custodial SU(2) symmetry to be imposed upon the scalar potential, so that rho=1 is preserved at tree level. This is desirable for SM extensions in light of constraints from electroweak precision data. The model has the following salient features that make it phenomenologically interesting:
     6The Georgi-Machacek (GM) model was proposed in 1985 [1] as a plausible scenario for EWSB with interesting collider signatures. In this model, the scalar sector of the Standard Model (SM) is extended by the addition of one complex and one real SU(2) triplet. The hypercharge assignments of the triplets allows for a custodial SU(2) symmetry to be imposed upon the scalar potential, so that rho=1 is preserved at tree level. This is desirable for SM extensions in light of constraints from electroweak precision data. The model has the following salient features that make it phenomenologically interesting:
    77 -  the hVV (and hhVV) coupling can be enhanced compared to the SM
    88 -  the presence of additional scalars (including doubly charged ones)
     
    1414The scalars (apart form Goldstone bosons) in this model can be classified as two custodial SU(2) singlets, a triplet and a fiveplet. The two custodial singlets mix by an angle alpha to give eigenstates h and H, one of which is the 125 GeV Higgs.
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    16 We follow Ref. [our paper] to implement the most general scalar potential that conserves custodial SU(2).  It is automatically CP-conserving. The parameters of the potential are denoted by
     16We follow Ref. [2] to implement the most general scalar potential that conserves custodial SU(2).  It is automatically CP-conserving. The parameters of the potential are denoted by
    1717mu2sq, mu3sq, lam1, lam2, lam3, lam4, lam5, M1coeff and M2coeff in the .fr file. We trade three of these to obtain the set of 9 external parameters (mh, Gf, tanth, lam2, lam3, lam4, lam5, M1coeff, M2coeff) in the .fr file that define the scalar potential.
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    2727
    2828'''References'''
    29 1. GM
    30 2. ourpaper
     291. H. Georgi and M. Machacek, Nucl. Phys. B 262, 463 (1985).
     302. K. Hartling, K. Kumar and H. E. Logan, Phys. Rev. D 90, 015007 (2014) [arXiv:1404.2640 [hep-ph]].
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