Determination of the strange quark mass from Cabibbo-suppressed tau decays with resummed perturbation theory in an effective scheme
نویسندگان
چکیده
We present an analysis of the ms-corrections to Cabibbo-suppressed τ lepton decays employing contour improved resummation within an effective scheme which is an essential new feature as compared to previous analyses. The whole perturbative QCD dynamics of the τ -system is described by the β-function of the effective coupling constant and by two γ-functions for the effective mass parameters of the strange quark in different spin channels. We analyze the stability of our results with regard to high-order terms in the perturbative expansion of the renormalization group functions. A numerical value for the strange quark mass in the MS scheme is extracted ms(Mτ ) = 130± 27exp ± 9th MeV. After running to the scale 1 GeV this translates into ms(1 GeV) = 176± 37exp ± 13th MeV. PACS: 11.10.Hi, 12.38.-t, 13.35.DX, 14.65.Bt
منابع مشابه
Strange Quark Mass Determination from Cabibbo–Suppressed Tau Decays
We present a general analysis of SU(3) breaking effects in the semi-inclusive tau hadronic width. The recent ALEPH measurements of the inclusive Cabibbo–suppressed decay width of the τ and several moments of its invariant mass distribution are used to determine the value of the strange quark mass. We obtain, in the MS scheme, ms(M 2 τ ) = (119± 24) MeV to O(α 3 s), which corresponds to ms(1GeV ...
متن کاملDetermining the Strange Quark Mass in Cabibbo Suppressed Tau Lepton Decays
In this work radiative corrections in the total hadronic decay rate of the τ lepton and some moments of its differential distributions are studied employing perturbative QCD and the operator product expansion. We calculate quadratic quark mass corrections in the strange mass to the decay rate ratio R τ to the order O(α 3 s m 2) and find that they contribute appreciably to the Cabibbo suppressed...
متن کاملStrange Quark Mass from the Invariant Mass Distribution of Cabibbo-Suppressed Tau Decays
Quark mass corrections to the τ hadronic width play a significant role only for the strange quark, hence providing a method for determining its mass. The experimental input is the vector plus axial-vector strange spectral function derived from a complete study of tau decays into strange hadronic final states performed by ALEPH. New results on strange decay modes from other experiments are also ...
متن کاملCombination of Colour Favoured and Colour
In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...
متن کاملExtraction of the strong coupling constant and strange quark mass from semileptonic τ decays
In this lecture I present a pedagogical introduction to the low-energy phenomenology of light flavors. The renormalization scheme freedom in defining QCD parameters is discussed. It is shown in some details how one can extract an accurate numerical value for the strong coupling constant from the τ -lepton decay rate into hadrons. As a related topic I discuss some peculiarities of definition of ...
متن کامل