| Texto completo | |
| Autor(es): |
Peris, Santiago
;
Boito, Diogo
;
Golterman, Maarten
;
Maltman, Kim
Número total de Autores: 4
|
| Tipo de documento: | Artigo de Revisão |
| Fonte: | MODERN PHYSICS LETTERS A; v. 31, n. 30 SEP 28 2016. |
| Citações Web of Science: | 5 |
| Resumo | |
In this review, we discuss why, in the determination of alpha(s)(m(tau)(2)) from hadronic tau decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of alpha(s)(m(tau)(2)). (AU) | |
| Processo FAPESP: | 15/20689-9 - Determinação precisa de parâmetros fundamentais da QCD |
| Beneficiário: | Diogo Rodrigues Boito |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |