Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level
Abstract The tW b ¯ $$ tW\overline{b} $$ production contributes to the real corrections to the tW cross section. It would interfere with the top quark pair production, causing difficulties in a clear definition of the tW b ¯ $$ tW\overline{b} $$ events. The subtraction of the t t ¯ $$ t\overline{t}...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-01-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP01(2025)158 |
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| author | Liang Dong Hai Tao Li Zheng-Yu Li Jian Wang |
| author_facet | Liang Dong Hai Tao Li Zheng-Yu Li Jian Wang |
| author_sort | Liang Dong |
| collection | DOAJ |
| description | Abstract The tW b ¯ $$ tW\overline{b} $$ production contributes to the real corrections to the tW cross section. It would interfere with the top quark pair production, causing difficulties in a clear definition of the tW b ¯ $$ tW\overline{b} $$ events. The subtraction of the t t ¯ $$ t\overline{t} $$ contributions has been performed in the diagram removal or diagram subtraction schemes for the tree-level processes. However, these schemes rely on the ability to identify the double resonant diagrams and thus can not be extended to loop diagrams. We propose a new scheme to subtract the t t ¯ $$ t\overline{t} $$ contributions by power expansion of the squared amplitude in the resonant region. In order to cancel the infra-red divergences of the loop amplitudes, a widely used method is to introduce the dipole counter-terms, an ingredient in calculations of the full next-to-leading order QCD corrections. In our scheme, these counter-terms are also power-expanded. As a proof of principle, we calculate the one-loop correction to the d d ¯ $$ d\overline{d} $$ → b ¯ Wt $$ \overline{b} Wt $$ process, and present the invariant mass distribution of the W b ¯ $$ W\overline{b} $$ system. |
| format | Article |
| id | doaj-art-1231cfa18c7d4ffc9a448ff32f2b6741 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-1231cfa18c7d4ffc9a448ff32f2b67412025-02-09T12:08:09ZengSpringerOpenJournal of High Energy Physics1029-84792025-01-012025112010.1007/JHEP01(2025)158Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop levelLiang Dong0Hai Tao Li1Zheng-Yu Li2Jian Wang3School of Physics, Shandong UniversitySchool of Physics, Shandong UniversitySchool of Physics, Shandong UniversitySchool of Physics, Shandong UniversityAbstract The tW b ¯ $$ tW\overline{b} $$ production contributes to the real corrections to the tW cross section. It would interfere with the top quark pair production, causing difficulties in a clear definition of the tW b ¯ $$ tW\overline{b} $$ events. The subtraction of the t t ¯ $$ t\overline{t} $$ contributions has been performed in the diagram removal or diagram subtraction schemes for the tree-level processes. However, these schemes rely on the ability to identify the double resonant diagrams and thus can not be extended to loop diagrams. We propose a new scheme to subtract the t t ¯ $$ t\overline{t} $$ contributions by power expansion of the squared amplitude in the resonant region. In order to cancel the infra-red divergences of the loop amplitudes, a widely used method is to introduce the dipole counter-terms, an ingredient in calculations of the full next-to-leading order QCD corrections. In our scheme, these counter-terms are also power-expanded. As a proof of principle, we calculate the one-loop correction to the d d ¯ $$ d\overline{d} $$ → b ¯ Wt $$ \overline{b} Wt $$ process, and present the invariant mass distribution of the W b ¯ $$ W\overline{b} $$ system.https://doi.org/10.1007/JHEP01(2025)158Higher-Order Perturbative CalculationsTop Quark |
| spellingShingle | Liang Dong Hai Tao Li Zheng-Yu Li Jian Wang Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level Journal of High Energy Physics Higher-Order Perturbative Calculations Top Quark |
| title | Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level |
| title_full | Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level |
| title_fullStr | Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level |
| title_full_unstemmed | Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level |
| title_short | Subtraction of the t t ¯ $$ t\overline{t} $$ contribution in tW b ¯ $$ tW\overline{b} $$ production at the one-loop level |
| title_sort | subtraction of the t t ¯ t overline t contribution in tw b ¯ tw overline b production at the one loop level |
| topic | Higher-Order Perturbative Calculations Top Quark |
| url | https://doi.org/10.1007/JHEP01(2025)158 |
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