Higgs-pair production via gluon fusion @NLO SM and Beyond

por Jonathan Ronca (IFIC - UV)

martes 13 oct. 2020 16:00 → 17:00 Europe/Madrid

Online

In 2012, LHC experiments detected a particle whose properties are compatible with the Higgs boson predicted within the Standard Model. Higher luminosity upgrade of the LHC will make the determination of the trilinear  self-interactions between Higgs bosons possible. NLO corrections to multi-Higgs production process are required to cross-check the experimental data. Besides, the current uncertainties do not exclude the possibility for the Higgs boson to belong to Beyond the Standard Models (BSM). A dedicated study of the tri-linear Higgs coupling can be done investigating the process that contributed more to the Higgs-pair production: the QCD induced Higgs-pair production via gluon fusion.

We study the NLO corrections to the Higgs pair production via gluon fusion, whose building block are the calculation of 2-loop Feynman diagrams. Analytical results for this process is currently not possible, hence a numerical evaluation is required. Extraction of UV and IR poles is mandatory to obtain physical cross section to achieve a numerically stable differential cross section. Including the real correction and the UV counterterm, together with the choice of a renormalisation scheme, yield a UV/IR finite physical result. A particular attention will be given to the estimation of the uncertainties due to the top mass scale and scheme uncertainties. In this talk, we will present NLO results for HH production at the LHC, including top mass uncertainties and will report on the status on the BSM calculation.