Perturbative Quantum Chromodynamics αs 4 -Order Corrections to the Ratio R for τ Decay
B. P. Nigam
Department of Physics & Astronomy, Box 871504, Arizona State University Tempe, Arizona, USA 85287-1504
Perturbative Quantum Chromodynamics αs 4 -Order Corrections to the Ratio R for τ Decay
B. P. Nigam
Department of Physics & Astronomy, Box 871504, Arizona State University Tempe, Arizona, USA 85287-1504
关键词 ：
12.20.Ds ,
11.10.Hi
Abstract ： The perturbative quantum chromodynamics correction to the semihadronic decay rate R of the heavy lepton τ was expressed by Braaten as an expansion in powers of αs to order αs 3 . Braaten had found the αs 3 order correction to be significant and conjectured that the αs 4 order corrections might also be significant. Braaten et al. later corrected the αs 3 -order result. We have extended the analytic calculations to order αs 4 ; it involves an unknown constant K3 which occurs in αs 4 order. In order to estimate the effect of αs 4 order correction, we have chosen K3 to range from -1000 to +1000 and we find that the value of R changes by about -11% to +10%, respectively, compared to the value of R = 3.5 obtained to αs 3 -order result.
Key words ：
12.20.Ds
11.10.Hi
出版日期: 1998-10-01
:
12.20.Ds
(Specific calculations)
11.10.Hi
(Renormalization group evolution of parameters)
引用本文:
B. P. Nigam. Perturbative Quantum Chromodynamics αs 4 -Order Corrections to the Ratio R for τ Decay[J]. 中国物理快报, 1998, 15(10): 711-712.
s 4 -Order Corrections to the Ratio R for τ Decay. Chin. Phys. Lett., 1998, 15(10): 711-712.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y1998/V15/I10/711
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