https://doi.org/10.1140/epjc/s10052-009-1103-2
Regular Article - Theoretical Physics
New physics contribution to neutral trilinear gauge boson couplings
1
SGTB Khalsa College, University of Delhi, Delhi, 110007, India
2
Department of Physics & Astrophysics, University of Delhi, Delhi, 110007, India
* e-mail: mdahiya@physics.du.ac.in
Received:
13
May
2009
Revised:
1
June
2009
Published online:
31
July
2009
We study the one-loop new physics effects to the CP even triple neutral gauge boson vertices γ ⋆ γ Z, γ ⋆ Z Z, Z ⋆ Z γ and Z ⋆ ZZ in the context of Little Higgs models. We compute the contribution of the additional fermions in Little Higgs models in the framework of direct product groups where [SU(2)×U(1)]2 gauge symmetry is embedded in SU(5) global symmetry and also in the framework of the simple group where SU(N)×U(1) gauge symmetry breaks down to SU(2) L ×U(1). We calculate the contribution of the fermions to these couplings when T parity is invoked. In addition, we re-examine the MSSM contribution at the chosen point of SPS1a′ and compare with the SM and Little Higgs models.
PACS: 12.15.-y – / 12.60.cn – / 13.10.+q – / 13.10.+q – / 14.70.-c –
© Springer-Verlag / Società Italiana di Fisica, 2009
