Top-Quark Decay at Next-to-Next-to-Next-to-Leading Order in QCD
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2023
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866910015748571136 |
|---|---|
| author | Chen, Long Chen, Xiang Guan, Xin Ma, Yan-Qing |
| author_facet | Chen, Long Chen, Xiang Guan, Xin Ma, Yan-Qing |
| contents | We present the first complete high-precision QCD corrections to the inclusive decay width $\mathrmΓ_t$, the $W$-helicity fractions $f_{\mathrm{L,R,0}}$ and semi-inclusive distributions for the top-quark decay process $t \rightarrow b + W^+ + X_{\mathrm{\tiny QCD}}$ at NNNLO in the strong coupling constant $α_s$. In particular, the pure NNNLO QCD correction decreases the $\mathrmΓ_t$ by about $0.8\%$ of the previous NNLO result at the top-quark pole mass scale, exceeding the error estimated by the usual scale-variation prescription. After taking into account all sources of errors, we get $\mathrmΓ_t = 1.3148^{+0.003}_{-0.005} + 0.027\,(m_t - 172.69)\,\text{GeV} $, the error of which meets the request by future colliders. On the other hand, the NNNLO QCD effects on $f_{\mathrm{L,R,0}}$ are found to be much smaller, at the level of one per-mille for the dominating $f_{0}$, predestining them to act as precision observables for the top-quark decay process. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_01937 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Top-Quark Decay at Next-to-Next-to-Next-to-Leading Order in QCD Chen, Long Chen, Xiang Guan, Xin Ma, Yan-Qing High Energy Physics - Phenomenology High Energy Physics - Experiment We present the first complete high-precision QCD corrections to the inclusive decay width $\mathrmΓ_t$, the $W$-helicity fractions $f_{\mathrm{L,R,0}}$ and semi-inclusive distributions for the top-quark decay process $t \rightarrow b + W^+ + X_{\mathrm{\tiny QCD}}$ at NNNLO in the strong coupling constant $α_s$. In particular, the pure NNNLO QCD correction decreases the $\mathrmΓ_t$ by about $0.8\%$ of the previous NNLO result at the top-quark pole mass scale, exceeding the error estimated by the usual scale-variation prescription. After taking into account all sources of errors, we get $\mathrmΓ_t = 1.3148^{+0.003}_{-0.005} + 0.027\,(m_t - 172.69)\,\text{GeV} $, the error of which meets the request by future colliders. On the other hand, the NNNLO QCD effects on $f_{\mathrm{L,R,0}}$ are found to be much smaller, at the level of one per-mille for the dominating $f_{0}$, predestining them to act as precision observables for the top-quark decay process. |
| title | Top-Quark Decay at Next-to-Next-to-Next-to-Leading Order in QCD |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2309.01937 |