منابع مشابه
QCD Analysis of Hadronic τ Decays Revisited
The calculation of perturbative corrections to the spectral moments observable in hadronic τ decays is reconsidered. The exact order-αs results and the resummation procedure of Le Diberder and Pich are compared with a partial resummation of the perturbative series based on the analysis of so-called renormalon chains. The perturbative analysis is complemented by a model-independent description o...
متن کاملVus From Hadronic τ Decays
We study extractions of |Vus| based on finite energy sum rule (FESR) analyses of hadronic τ decay data. We show (i) that the “(0,0) spectral weight” implementation (proposed previously in the literature as a favorable version of this analysis) suffers from significant convergence problems, but (ii) that alternate implementations exist which bring these problems under control. Results based on p...
متن کاملDetermination of |Vus| from hadronic τ decays
Elvira Gámiz, Matthias Jamin, Antonio Pich, Joaquim Prades and Felix Schwab a Department of Physics & Astronomy, University of Glasgow Glasgow G12 8QQ, United Kingdom. b ICREA and IFAE, Universitat Autònoma de Barcelona E-08193 Bellaterra, Barcelona, Spain. c Departament de F́ısica Teòrica, IFIC, Universitat de València–CSIC Apt. de Correus 22085, E-46071 València, Spain. d Centro Andaluz de F́ıs...
متن کاملτ → ω3πν Decays
Theoretical study of anomalous decay mode τ → ωπππν is presented. Theoretical value of the branching ratio of τ − → ωπ − π 0 π 0 ν agrees well with data. The branching ratio of τ − → ωπ + π − π − ν τ is predicted. It is found that the vertices of a 1 ρπ and ωρπ play dominant role in these two decay modes. CVC is satisfied and there is no adjustable parameter.
متن کاملRare τ decays
The availability of large samples of τ leptons allows for searches of very rare (Standard Model forbidden) τ decay modes, which provide a sensitive probe for physics beyond the Standard Model (BSM). In recent years, very large samples of τ leptons have been made available by the high luminosity running of the two asymmetric B-factories PEP − II and KEK B, which, in light of the comparable size ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2012
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2012.02.033