Shedding light on top partner at the LHC
Abstract We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-01-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1007/JHEP01(2019)139 |
| _version_ | 1818887431284326400 |
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| author | Haider Alhazmi Jeong Han Kim Kyoungchul Kong Ian M. Lewis |
| author_facet | Haider Alhazmi Jeong Han Kim Kyoungchul Kong Ian M. Lewis |
| author_sort | Haider Alhazmi |
| collection | DOAJ |
| description | Abstract We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays T → bW , T → tZ, and T → th are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the T -t-g and T -t-γ interactions, considering both spin- 1 2 $$ \frac{1}{2} $$ and spin- 3 2 $$ \frac{3}{2} $$ top partners. We perform a semi-realistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios BR(T → tγ) ≪ BR(T → tg) due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to T T ¯ → t t ¯ γ g $$ T\overline{T}\to t\overline{t}\gamma g $$ is more significant than the sensitivity to T T ¯ → t t ¯ gg $$ T\overline{T}\to t\overline{t} gg $$ . This is due to much smaller backgrounds attributed to the isolated high-p T photon. We find that with these decay channels and 3 ab−1 of data, the LHC is sensitive to top partner masses m T ≲ 1.4-1.8 TeV for spin- 1 2 $$ \frac{1}{2} $$ and spin- 3 2 $$ \frac{3}{2} $$ top partners, respectively. |
| first_indexed | 2024-12-19T16:37:07Z |
| format | Article |
| id | doaj.art-c7ded35c36b94cf9a7522e65c4b46060 |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-19T16:37:07Z |
| publishDate | 2019-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-c7ded35c36b94cf9a7522e65c4b460602022-12-21T20:13:56ZengSpringerOpenJournal of High Energy Physics1029-84792019-01-012019113010.1007/JHEP01(2019)139Shedding light on top partner at the LHCHaider Alhazmi0Jeong Han Kim1Kyoungchul Kong2Ian M. Lewis3Department of Physics and Astronomy, University of KansasDepartment of Physics and Astronomy, University of KansasDepartment of Physics and Astronomy, University of KansasDepartment of Physics and Astronomy, University of KansasAbstract We investigate the sensitivity of the 14 TeV LHC to pair-produced top partners (T) decaying into the Standard Model top quark (t) plus either a gluon (g) or a photon (γ). The decays T → tg and T → tγ can be dominant when the mixing between the top partner and top quark are negligible. In this case, the conventional decays T → bW , T → tZ, and T → th are highly suppressed and can be neglected. We take a model-independent approach using effective operators for the T -t-g and T -t-γ interactions, considering both spin- 1 2 $$ \frac{1}{2} $$ and spin- 3 2 $$ \frac{3}{2} $$ top partners. We perform a semi-realistic simulation with boosted top quark tagging and an appropriate implementation of a jet-faking-photon rate. Despite a simple dimensional analysis indicating that the branching ratios BR(T → tγ) ≪ BR(T → tg) due to the electric-magnetic coupling being much smaller than the strong force coupling, our study shows that the LHC sensitivity to T T ¯ → t t ¯ γ g $$ T\overline{T}\to t\overline{t}\gamma g $$ is more significant than the sensitivity to T T ¯ → t t ¯ gg $$ T\overline{T}\to t\overline{t} gg $$ . This is due to much smaller backgrounds attributed to the isolated high-p T photon. We find that with these decay channels and 3 ab−1 of data, the LHC is sensitive to top partner masses m T ≲ 1.4-1.8 TeV for spin- 1 2 $$ \frac{1}{2} $$ and spin- 3 2 $$ \frac{3}{2} $$ top partners, respectively.http://link.springer.com/article/10.1007/JHEP01(2019)139Beyond Standard ModelHiggs Physics |
| spellingShingle | Haider Alhazmi Jeong Han Kim Kyoungchul Kong Ian M. Lewis Shedding light on top partner at the LHC Journal of High Energy Physics Beyond Standard Model Higgs Physics |
| title | Shedding light on top partner at the LHC |
| title_full | Shedding light on top partner at the LHC |
| title_fullStr | Shedding light on top partner at the LHC |
| title_full_unstemmed | Shedding light on top partner at the LHC |
| title_short | Shedding light on top partner at the LHC |
| title_sort | shedding light on top partner at the lhc |
| topic | Beyond Standard Model Higgs Physics |
| url | http://link.springer.com/article/10.1007/JHEP01(2019)139 |
| work_keys_str_mv | AT haideralhazmi sheddinglightontoppartneratthelhc AT jeonghankim sheddinglightontoppartneratthelhc AT kyoungchulkong sheddinglightontoppartneratthelhc AT ianmlewis sheddinglightontoppartneratthelhc |