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— | preprints:2004:ttp04-28 [2016/03/17 11:03] (current) – created - external edit 127.0.0.1 |
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| ====== TTP04-28 Strange Quark Mass from Tau Lepton Decays with O(\alpha_s^3) Accuracy ====== |
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| <hidden TTP04-28 Strange Quark Mass from Tau Lepton Decays with O(\alpha_s^3) Accuracy > The first complete calculation of the quadratic quark mass correction |
| to the correlator of the two currents relevant for the |
| strangeness-changing semihadronic tau-decay rate is presented |
| including its real part at the four-loop level. This allows to |
| perform the extraction of the strange quark mass m_s from the decay |
| width of the tau-lepton with full O(alpha_s^3) |
| accuracy. In agreement with previous estimates the newly computed |
| alpha_s^3 term proves to be rather large. This justifies inclusion |
| of the similarly estimated alpha_s^4 term in phenomenological |
| analysis. Combined with an updated value of V_{us} and an |
| ``'improved'' version of the renormalization group improvement of the |
| perturbative series this leads to an increase of the central value of |
| m_s by about 20% and a partial reduction of the theoretical |
| uncertainty by about 50%. |
| </hidden> |
| |**P.A. Baikov, K.G. Chetyrkin and J.H.K\"uhn** | |
| |** Phys. Rev. Lett. 95 012003-1 2005 ** | |
| | {{preprints:2004:ttp04-28.pdf|PDF}} {{preprints:2004:ttp04-28.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0412350|arXiv]] | |
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