Associated production of single top and Higgs at the LHC in the littlest Higgs model with T-parity

Bingfang Yang,Ning Liu,Jinzhong Han

doi:10.1007/jhep04(2015)148

Abstract

In the littlest Higgs model with T-parity (LHT), we study the t-channel single top production in association with a Higgs boson at 8 and 14 TeV LHC. We find that the cross section can be enhanced obviously in this model compared to the Standard Model. By performing a simple parton-level simulation through $$ pp\to t\left(\to {\ell}^{+}\nu b\right)h\left(\to b\overline{b}\right)j $$ at 14 TeV LHC, we find that the observability of the signal is promising in the favorable parameter space.

Highlights

We focus on t-channel process and investigate the observability of pp → thj with sequent decays t → +νb and h → bb at 14 TeV LHC in the littlest Higgs model with T-parity (LHT) model
In the framework of the LHT model, we investigate the t-channel process of pp → thj at 8 and 14 TeV LHC
We find that the cross section can be enhanced obviously in some parameter space compared to the SM predictions

Summary

A brief review of the LHT model

The LHT model was based on a non-linear σ model describing an SU(5)/ SO(5) symmetry breaking, with the global group SU(5) being spontaneously broken into SO(5) by a 5 × 5 symmetric tensor at the scale f ∼ O(TeV). In the top Yukawa Sector, in order to cancel the large radiative correction to Higgs mass parameter induced by top quark, an additional top partner T+ is introduced, which is even under T-parity and transforms as a singlet under SU(2)L. For the top Yukawa interaction, one can write down the following SU(5) and T-parity invariant Lagrangian [35,36,37,38]: Lt. where ijk and xy are antisymmetric tensors, and i, j and k run over 1, 2, 3 and x and y over 4, 5. The mixing can be parameterized by dimensionless ratio R = λ1/λ2, where λ1 and λ2 are two dimensionless top quark Yukawa couplings. This mixing parameter can be used by xL with. The Higgs coupling with down-type quarks have two different cases [40], namely case A and case B

Numerical results and discussions

Summary