Quark Mass Ratios and Kl3 Decay Parameters
نویسندگان
چکیده
منابع مشابه
QCD Isospin Breaking in Meson Masses, Decay Constants and Quark Mass Ratios
The procedure to calculate masses and matrix-elements in the presence of mixing of the basis states is explained in detail. We then apply this procedure to the twoloop calculation in Chiral Perturbation Theory of pseudoscalar masses and decay constants including quark mass isospin breaking. These results are used to update our analysis of Kl4 done previously and obtain a value of mu/md in addit...
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An ambiguity in the calculation of CKM matrix elements from semi-leptonic decay rates is resolved: to every choice of scales for the quark masses in the phasespace factor and in the QCD-correction factor, there corresponds a specific QCDcorrection factor. This factor is modified in such a way as to make the final result independent of the scales. Specific expressions are given for the case of o...
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The precise numerical value of the strange quark mass is a controversial issue, with important implications for low-energy phenomenology. The Particle Data Group [1] quotes a rather wide range of ms values, reflecting the large uncertainties in the present determinations of this parameter from QCD Sum Rules and Lattice calculations. The high precision data on tau decays [2] collected at LEP and...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1980
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.63.2152