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Higher-order perturbative QCD in the decay H to gg

Grant number: 19/17046-0
Support type:Scholarships abroad - Research Internship - Master's degree
Effective date (Start): October 05, 2019
Effective date (End): March 20, 2020
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal researcher:Diogo Rodrigues Boito
Grantee:Gabriel Augusto das Neves
Supervisor abroad: Jan Piclum
Home Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Research place: University of Siegen, Germany  
Associated to the scholarship:18/12305-4 - Angular distributions of the decay tau to K PI neutrino, BP.MS

Abstract

In the absence of direct observation of Beyond Standard Model physics in the LHC, precise tests of the theory require increasing precision. The decay width of the Higgs boson into gluons is known up to fourth order in the strong coupling, alpha_s. In this work, we will study the effects due to higher-order QCD corrections in this decay. The main calculation of this project will be performed in the large-beta_0 limit of QCD, where the perturbative series is known to all orders in alpha_s. Our goal is to rigorously predict the neglected contributions in the present theoretical calculation and obtain, in a reliable way, the theoretical uncertainties associated with the truncation of the perturbative series. The best prescription for the renormalization-scale setting in the process will also be studied. (AU)