Higgs Boson Production via Gluon Fusion in the Standard Model with four Generations

TL;DR

This paper investigates Higgs boson production via gluon fusion at the LHC, comparing the Standard Model with a four-generation model, including full mass dependence and NLO effects to enhance search strategies.

Contribution

It provides detailed calculations of Higgs production with four generations, incorporating full mass dependence and NLO corrections, improving theoretical predictions for LHC searches.

Findings

Enhanced Higgs production cross sections with four generations

Full mass dependence significantly affects cross section calculations

NLO effects refine the theoretical predictions

Abstract

Higgs bosons can be produced copiously at the LHC via gluon fusion induced by top and bottom quark loops, and can be enhanced strongly if extra heavy quarks exist. We present results for Higgs +zero-, one- and two-jet production at the LHC, in both the Standard Model and the 4th generation model, by evaluating the corresponding heavy quark triangle, box and pentagon Feynman diagrams. We compare the results by using the effective Higgs-gluon interactions in the limit of heavy quarks with the cross sections including the full mass dependences. NLO effects with full mass dependence are included in the inclusive Higgs boson production rate. Our results improve the theoretical basis for fourth generation effects on the Higgs boson search at the LHC.