NNLO QCD corrections to the polarized top quark decay $t(\uparrow) \to X_b+W^+$
| Autor: | Czarnecki, A., Groote, S., Körner, J. G., Piclum, J. H. |
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| Rok vydání: | 2018 |
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| Zdroj: | Phys. Rev. D 97, 094008 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.97.094008 |
| Popis: | We compute the next-to-next-to-leading order (NNLO) QCD corrections to the decay $t(\uparrow) \to X_b +W^+$ of a polarized top quark. The spin-momentum correlation in this quasi two-body decay is described by the polar angle distribution $\mathrm{d}\Gamma/\mathrm{d}\cos\theta_P=\frac{\Gamma}{2}(1+P_t\, \alpha_P\, \cos\theta_P)$ where $P_t$ is the polarization of the top quark and $\alpha_P$ denotes the asymmetry parameter of the decay. For the latter we find $\alpha^{\mathrm{NNLO}}_P=0.3792\pm 0.0037$. Comment: 17 pages, 3 figures; v2: added Fig. 2 and 3 and corresponding discussion |
| Databáze: | arXiv |
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