W+W−H production through bottom quarks fusion at hadron colliders

Pankaj Agrawal,Biswajit Das

doi:10.1016/j.physletb.2021.136461

Abstract

With the standard model working well in describing the collider data, the focus is now on determining the standard model parameters as well as for any hint of deviation. In particular, the determination of the couplings of the Higgs boson with itself and with other particles of the model is important to better understand the electroweak symmetry breaking sector of the model. In this letter, we look at the process pp→WWH, in particular through the fusion of bottom quarks. Due to the non-negligible coupling of the Higgs boson with the bottom quarks, there is a dependence on the WWHH coupling in this process. This sub-process receives the largest contribution when the W bosons are longitudinally polarized. We compute one-loop QCD corrections to various final states with polarized W bosons. We find that the corrections to the final state with the longitudinally polarized W bosons are large. It is shown that the measurement of the polarization of the W bosons can be used as a tool to probe the WWHH coupling in this process. We also examine the effect of varying WWHH coupling in the κ-framework.

Highlights

Standard Model (SM) has been very successful
In particular we focus on the corrections to cross sections and distributions for various polarization configurations of the final state particles
The cross section rapidly increases with center of mass energy (CME) as PDFs for b-quarks are small for lower energies

Summary

Introduction

Standard Model (SM) has been very successful. It has been tested in a wide variety of low energy and high energy experiments [1, 2]. Self-couplings of the Higgs boson and its couplings with some of the standard model particles are still loosely bound. The process pp → HHV , where a pair of Higgs bosons are produced in association with a W or a Z boson, allows us to separately measure HHW W and HHZZ couplings. At a 100 TeV collider, gluon-gluon scattering and bottom-bottom quark scattering give important contributions These contributions depend on HHW W coupling. The contribution of bottom-bottom scattering is only about 15 − 20% of the light quarks scattering contribution at the 100 TeV center of mass energy (CME) and at the leading order (LO), light quarks contribution does not depend on W W HH coupling The dependence on this quartic coupling, W W HH, can be enhanced if we measure the polarization of the final state W bosons. We present the numerical results, and the last section has the conclusions

The Process

Calculations and Checks

Numerical Results

Results for the SM

Anomalous coupling effect

Conclusion