Top tree amplitudes for higher order calculations
| Autor: | Campbell, John M., Ellis, R. Keith |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We present compact analytic results for tree-level amplitudes containing a $t \bar{t}$ pair accompanied by up to four massless partons, $t \bar{t}gg$, $t \bar{t}ggg$, $t \bar{t}gggg$, $t \bar{t}q\bar{q}$, $t \bar{t}q\bar{q}g$, $t \bar{t}q\bar{q}gg$ and $t\bar{t}q\bar{q}q^\prime \bar{q}^\prime$. The results, obtained using BCFW on-shell recursion, are based both on previous published results and on the new calculations performed in this paper. These amplitudes are sufficient to calculate the production of a $t\bar{t}$ pair and zero, one, or two light parton jets, with the option to include the tree-level decays $t \to b \nu e^+$ and $\bar{t} \to \bar{b} e^- \bar{\nu}$ efficiently. Our results are part of the NNLO corrections to $t \bar{t}$ production including the decay correlations for on-shell top quarks. Comment: 38 pages, 2 figures, results available as ancillary files; v2 corrects Eq. (7.34) in TeX and ancillary files |
| Databáze: | arXiv |
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