VITAE PHILOSOPHIA DUX

The QCD analysis of hadronic τ decays is reviewed and a summary of the present phenomenological status is presented. The following topics are discussed: the determination of αs(m 2 τ ) = 0.338 ± 0.012 from the inclusive τ hadronic width, the measurement of |Vus| through the Cabibbo-suppressed decays of the τ , and the extraction of chiral-perturbation-theory couplings from the spectral tau data.

Section: Determination Of α Smentioning

confidence: 99%

“…This approximation is known as fixed-order perturbation theory (FOPT), while the improved expression (11), keeping the non-expanded values of A (n) (α s ), is usually called contour-improved perturbation theory (CIPT) [7,30].…”

Section: Fixed-order Perturbation Theorymentioning

confidence: 99%

QCD description of hadronic tau decays

Pich¹

2011

“…where N C = 3 is the number of quark colours and S EW = 1.0201 ± 0.0003 contains the electroweak radiative corrections [35][36][37]. The dominant correction (∼ 20%) is the perturbative QCD contribution δ P , which is already known to O(α 4 s ) [32,38] and includes a resummation of the most important higher-order effects [33,39].…”

Section: The Inclusive Hadronic Width Of the Taumentioning

confidence: 99%

Tau Physics: Theory Overview

Pich

2008

The present status of some selected topics on tau physics is presented: charged-current universality tests, bounds on lepton-flavour violation, the determination of alpha_s from the inclusive tau hadronic width, the measurement of |V_{us}| through the Cabibbo-suppressed decays of the tau, and the theoretical description of the "tau -> nu_tau K pi" spectrum.Comment: Invited talk at the 2008 International Workshop on e+e- collisions from Phi to Psi (PhiPsi08, Frascati, Italy, 7-10 April 2008

Section: The Inclusive Hadronic Width Of the Taumentioning

confidence: 99%

Recent Progress on Tau Lepton Physics

Pich

2009

Some important aspects of hadronic tau decays are reviewed: the determination of alpha_s from the inclusive tau hadronic width, the measurement of |V_{us}| through the Cabibbo-suppressed decays of the tau, and the theoretical description of the tau -> nu_tau K pi spectrum. The present status of other relevant electroweak topics, such as charged-current universality tests or bounds on lepton-flavour violation, has been already summarized in a previous review.Comment: Proc. 14th International QCD Conference (QCD08), Montpellier, 7-12th July 200