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Accurate QCD parameter determination

Grant number: 14/50683-0
Support Opportunities:Scholarships in Brazil - Post-Doctorate
Effective date (Start): November 01, 2014
Effective date (End): August 31, 2015
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Marina Nielsen
Grantee:Diogo Rodrigues Boito
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil


The precise knowledge of fundamental Quantum Chromodynamics (QCD) parameters is essential to precision calculations in particle physics. Several of them can be determined through the sound theoretical description" of decays tau u → hadrons + nu_tau combined with experimental data obtained at LEP (CERN). In 2014, the group responsible for the ALEPH data published a re-analysis of the data for tau u → hadrons + nu_tau. The first goal of this research project is a new determination of alpha_s - the strong coupling - that combines the recent theoretical developments with the data sets from ALEPH and OPAL collaborations. Other aspects of the theoretical description will also be assessed, e.g., low-energy constants, the contribution of condensates, and violations of quark-hadron duality. In our work, it will also be important to investigate more fundamental theoretical aspects of perturbative QCD, such as the use of the renormalization group. In parallel, another research subject that can be explored is the anomalous Higgs couplings in the context of the dimension 6 effective Lagrangian. (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; FRANCIS, ANTHONY; GOLTERMAN, MAARTEN; HUDSPITH, RENWICK; LEWIS, RANDY; MALTMAN, KIM; PERIS, SANTIAGO. Low-energy constants and condensates from ALEPH hadronic tau decay data. Physical Review D, v. 92, n. 11, . (14/50683-0)
BOITO, DIOGO; HORNUNG, DIRK; JAMIN, MATTHIAS. Anomalous dimensions of four-quark operators and renormalon structure of mesonic two-point correlators. Journal of High Energy Physics, n. 12, . (14/50683-0)

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