Higgs Trilinear self-coupling determination through one-loop effects

Authors : Xiaoran Zhao ​email and Ambresh Shivaji ​email

Proposals have been made to access information on the Higgs self-coupling by accurately measuring cross sections and distributions using single-Higgs processes, see for instance ​arXiv:1607.04251.

This page contains the codes for generating events in processes p p > VH, VBF, tHj and ttH and H > 4l including the effect of trilinear Higgs self coupling at one-loop.

Please cite: Fabio Maltoni, Davide Pagani, Ambresh Shivaji and Xiaoran Zhao​arXiv:1709.08649

trilinear-FF (The Form-factor code to run VH, VBF and Hto4l) FF​

In this folder we provide:

a) 'loop_hvv' : the UFO model folder with modified VVH vertices due to trilinear couplings at one-loop

b) "hvvcoef.cpp": C++ implementation of form factors

c) "Makefile" : to generate static library (libhvvcoef.a) which is used during event generation

d) "ReadMe.txt" : explains how to use the code step by step and benchmarking for HZ process

trilinear-RW (The Reweighting code to run VH, VBF, tHj and ttH) RW​

In this folder we provide:

a) 'hhh-model': the UFO model file to be used

b) "gevirt.sh": auxiliary script to generate virtual EW subprocesses

c) "vvh-loop_diagram_generation.py" : to select right set of one-loop diagrams in VH, VBF and tHj

d) "tth-loop_diagram_generation.py" : to select right set of one-loop diagrams in ttH

e) "check_OLP.f": reweighting code

f) "makefile" : makefile for reweighting code

g) "ReadMe.txt" : explains how to use the code step by step and benchmarking for HZ process

h) we also provide 'example_hz' folder which contains a simple script to build the reweighting code for HZ as an example

(All calculations are done in G_\mu scheme and benchmarking is done with MG5_aMC_v2_5_5)

ZH diagrams at one-loop due to trilinear coupling

ttH diagrams at one-loop due to trilinear coupling

(Not all diagrams are included here.)