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Title: | Determination of ms and |Vus| from hadronic τ decays |
Authors: | Gámiz, Elvira; Prades, Joaquim; Jamin, Matthias; Schwab, Félix; Pich, Antonio CSIC ORCID | Keywords: | Quark masses and SM parameters QCD Sum rules |
Issue Date: | 2003 | Publisher: | Institute of Physics Publishing | Citation: | Journal of High Energy Physics (1): 060 (2003) | Abstract: | The mass of the strange quark is determined from SU(3)-breaking effects in the τ hadronic width. Compared to previous analyses, the contributions from scalar and pseudoscalar spectral functions, which suffer from large perturbative corrections, are replaced by phenomenological parametrisations. This leads to a sizeable reduction of the uncertainties in the strange mass from τ decays. Nevertheless, the resulting ms value is still rather sensitive to the moment of the invariant mass distribution which is used for the determination, as well as the size of the quark-mixing matrix element |Vus|. Imposing the unitarity fit for the CKM matrix, we obtain ms(2 GeV) = 117 ± 17 MeV, whereas for the present Particle Data Group average for |Vus|, we find ms(2 GeV) = 103 ± 17 MeV. On the other hand, using an average of ms from other sources as an input, we are able to calculate the quark-mixing matrix element |Vus|, and we demonstrate that if the present measurement of the hadronic decay of the τ into strange particles is improved by a factor of two, the determination of |Vus| is more precise than the current world average. | Description: | 21 páginas, 1 figura, 6 tablas.-- arXiv:hep-ph/0212230v1 | Publisher version (URL): | http://dx.doi.org/10.1088/1126-6708/2003/01/060 | URI: | http://hdl.handle.net/10261/33141 | DOI: | 10.1088/1126-6708/2003/01/060 | ISSN: | 1126-6708 |
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