Abstract
We present an extension of the JHUGen and MELA framework, which includes an event generator and library for the matrix element analysis. It enables simulation, optimal discrimination, reweighting techniques, and analysis of a bosonic resonance and the triple and quartic gauge boson interactions with the most general anomalous couplings. The new features, which become especially relevant at the current stage of LHC data taking, are the simulation of gluon fusion and vector boson fusion in the off-shell region, associated $ZH$ production at NLO QCD including the $gg$ initial state, and the simulation of a second spin-zero resonance. We also quote translations of the anomalous coupling measurements into constraints on dimension-six operators of an effective field theory. Some of the new features are illustrated with projections for experimental measurements with the full LHC and HL-LHC datasets.
Highlights
We present a coherent framework for the measurement of couplings of the Higgs (H) boson and a possible second spin-zero resonance
We build upon the earlier developed framework of the JHU generator and MELA analysis package [1,2,3,4] and extensively use matrix elements provided by MCFM [5,6,7,8,9]
Thanks to the transparent implementation of standard model (SM) processes in MCFM, we extend them to add the most general scalar and gauge couplings and possible additional states
Summary
We present a coherent framework for the measurement of couplings of the Higgs (H) boson and a possible second spin-zero resonance. Some new features in this framework have been reported earlier [41] and have been used for LHC experimental analyses Most notably, this framework was employed in recent Run-II measurements of the HVV anomalous couplings from the first joint analysis of on-shell production and decay [71,72], from the first joint analysis of onshell and off-shell H boson production [73], for the first measurement of the CP structure of the Yukawa interaction between the H boson and top quark [74], in the search for a second resonance in interference with the continuum background [75,76], and in projections to future on-shell and off-shell H boson measurements at the high luminosity (HL) LHC [77]. Even the direct production of new resonances will first show up as deviations from the expected high-energy tail of kinematic distributions Analyzing these newly accessible features in off-shell H boson production is of paramount importance to understand electroweak symmetry breaking in the SM and possible extensions involving new particles. The technical details of the framework are described in the manual, which can be downloaded at [87], together with the source code
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