| Grant number: | 18/14967-4 |
| Support Opportunities: | Regular Research Grants |
| Start date: | December 01, 2018 |
| End date: | November 30, 2022 |
| Field of knowledge: | Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields |
| Agreement: | Universidad de Salamanca |
| Mobility Program: | SPRINT - Projetos de pesquisa - Mobilidade |
| Principal Investigator: | Diogo Rodrigues Boito |
| Grantee: | Diogo Rodrigues Boito |
| Principal researcher abroad: | Vicent Mateu Barreda |
| Institution abroad: | Universidad de Salamanca (USAL), Spain |
| Host Institution: | Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil |
| Associated research grant: | 15/20689-9 - Precise determination of fundamental QCD parameters, AP.JP |
Abstract
Quark masses are fundamental parameters of the Standard Model that play a keyrole in precision tests of the theory. They cannot be directly observed due to the confining nature of the strong interactions and can only be measured indirectly through observables that strongly depend on them and which can be computed with high precision in QCD. An example of these observables are moments of the inclusive $e^+e^-$ hadronic cross section. Their theoretical counterpart can be obtained through the use of the method of QCD sum rules. This framework can be adapted to pseudo-scalarcurrents as well, where experimental data are replaced by results from lattice QCD simulations. The agreement between these two methods is a non-trivial test of both the procedure and latticeQCD. However, so far, the charm quark mass determinations using the pseudo-scalar current suffer from large theoretical incertitudes. The main aim of this project is to improve the determination of the charm and bottom quark masses through the understanding of the origin of their uncertainties and the use of renormalization scheme variations to improve the convergence ofthe perturbative series. This would certainly lead to a much more reliable and precise extraction of these fundamental parameters. (AU)
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