Dominant production of heavier Higgs bosons through vector boson fusion in the NMSSM

Debottam Das

doi:10.1103/physrevd.99.095035

Abstract

We study the features of the additional Higgs bosons in the Next-to-Minimal Supersymmetric Standard Model where the lightest beyond Standard Model Higgs boson does not dominantly couple to up-type quarks. The new state is dominantly singlet-like while it can also accommodate a small down-type Higgs component. The gluon-gluon fusion cannot be adequate enough for such a Higgs production. We show that the vector-boson fusion may become the leading production mechanism to probe this new scalar at the LHC. Using the existing 13 TeV LHC data for an integrated luminosity $36.1~fb^{-1}$, we show the LHC constraints on the parameter space. Finally, we also study the reach of the planned high luminosity LHC (${\mathcal L}=3~{\rm ab}^{-1}$ at $\sqrt s=$~14 TeV) and the proposed high energy upgrade of the LHC (${\mathcal L}=15~{\rm ab}^{-1}$ at $\sqrt s=$~27 TeV) to probe this singlet-like Higgs scalar.

Highlights

The Higgs boson of the Standard Model (SM) which is considered as one of the main motivations of the Large Hadron Collider (LHC) has already been discovered a few years ago [1,2] with mass mH ≃ 125 GeV
In the context of the simplest supersymmetric model (SUSY)—the minimal supersymmetric Standard Model (MSSM) [3,4], large stop masses and/or mixing have been required to generate a Higgs mass of 125 GeV which may lead to dangerous charge and color breaking minima [6] and could produce a large fine-tuning on the allowed parameter space [7]
We show that the rate of non SM-like Higgs productions via the gluon-gluon fusion process could be insignificant in some of parts of the next-to-minimal supersymmetric Standard Model (NMSSM) parameter space

Summary

INTRODUCTION

The Higgs boson of the Standard Model (SM) which is considered as one of the main motivations of the Large Hadron Collider (LHC) has already been discovered a few years ago [1,2] with mass mH ≃ 125 GeV. (i) First we review the role of gluon-gluon fusion in the context of production of the scalar H It depends on the effective Hgg coupling which in turn depends on the masses of the squarks and the heavy fermions in the loops. While the suppression in the Htt coupling is related to an insignificant Hu component in H, the smallness of the Hbbcoupling can be attributed to the small tan β and large singlet component [13].2 In this specific region, the gluon-gluon fusion may not be adequate enough for such a Higgs production. III we show parameter space where rate of production of a new singlet dominated Higgs scalar via the VBF channel can be comparable or even dominate over the gluon-gluon fusionppffiffirocess.

HIGGS SECTOR IN THE NEXT TO MINIMAL SUPERSYMMETRIC STANDARD MODEL

CHOICE OF PARAMETERS AND LHC CONSTRAINTS

C H2gg

CONCLUSION