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Padé approximants and the QCD perturbative series for tau decays into hadrons

Grant number: 16/01341-4
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2016
Effective date (End): February 28, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Diogo Rodrigues Boito
Grantee:Fabio Henrique Oliani
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


The hadronic tau decays are an important source of information about QCD since their description is theoretically clean. In particular, the strong coupling (alpha_s) can be extracted with competitive precision. However, a source of theoretical uncertainty persists, namely, what is the best prescription for the use of the renormalization group in the optimization of the perturbative series. In this work, we will use the method of Pade approximants to extract information about the perturbative series in intermediate and higher orders. The results should contribute to the solution of this ambiguity and therefore to improve the knowledge of alpha_s. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BOITO, DIOGO; MASJUAN, PERE; OLIANI, FABIO. Higher-order QCD corrections to hadronic tau decays from Pade approximants. Journal of High Energy Physics, n. 8, . (16/01341-4, 15/20689-9)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
OLIANI, Fabio Henrique. Padé Approximants and perturbative series of QCD in τ decays. 2018. Master's Dissertation - Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) São Carlos.

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