On broad Kaluza-Klein gluons
Abstract In theories with a warped extra dimension, composite fermions, as e.g. the right-handed top quark, can be very strongly coupled to Kaluza-Klein (KK) fields. In particular, the KK gluons in the presence of such composite fields become very broad resonances, thus remarkably modifying their ex...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2021-05-01
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| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP05(2021)121 |
| _version_ | 1818624542978867200 |
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| author | Rafel Escribano Mikel Mendizabal Mariano Quirós Emilio Royo |
| author_facet | Rafel Escribano Mikel Mendizabal Mariano Quirós Emilio Royo |
| author_sort | Rafel Escribano |
| collection | DOAJ |
| description | Abstract In theories with a warped extra dimension, composite fermions, as e.g. the right-handed top quark, can be very strongly coupled to Kaluza-Klein (KK) fields. In particular, the KK gluons in the presence of such composite fields become very broad resonances, thus remarkably modifying their experimental signatures. We have computed the pole mass and the pole width of the KK gluon, triggered by its interaction with quarks, as well as the prediction for proton-proton cross-sections using the full propagator and compared it with that obtained from the usual Breit-Wigner approximation. We compare both approaches, along with the existing experimental data from ATLAS and CMS, for the t t ¯ $$ t\overline{t} $$ , t t ¯ W $$ t\overline{t}W $$ , t t ¯ Z $$ t\overline{t}Z $$ , t t ¯ H $$ t\overline{t}H $$ , and tt tt ¯ $$ tt\overline{tt} $$ channels. We have found differences between the two approaches of up to about 100%, highlighting that the effect of broad resonances can be dramatic on present, and mainly future, experimental searches. The channel tt tt ¯ $$ tt\overline{tt} $$ is particularly promising because the size of the cross-section signal is of the same order of magnitude as the Standard Model prediction, and future experimental analyses in this channel, especially for broad resonances, can shed light on the nature of possible physics beyond the Standard Model. |
| first_indexed | 2024-12-16T18:58:37Z |
| format | Article |
| id | doaj.art-905e24fd02a44df8b2c99c5a42f6afec |
| institution | Directory Open Access Journal |
| issn | 1029-8479 |
| language | English |
| last_indexed | 2024-12-16T18:58:37Z |
| publishDate | 2021-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj.art-905e24fd02a44df8b2c99c5a42f6afec2022-12-21T22:20:27ZengSpringerOpenJournal of High Energy Physics1029-84792021-05-012021512710.1007/JHEP05(2021)121On broad Kaluza-Klein gluonsRafel Escribano0Mikel Mendizabal1Mariano Quirós2Emilio Royo3Grup de Física Teòrica, Departament de Física, Universitat Autònoma de BarcelonaDeutsches Elektronen-SynchrotronInstitut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and TechnologyGrup de Física Teòrica, Departament de Física, Universitat Autònoma de BarcelonaAbstract In theories with a warped extra dimension, composite fermions, as e.g. the right-handed top quark, can be very strongly coupled to Kaluza-Klein (KK) fields. In particular, the KK gluons in the presence of such composite fields become very broad resonances, thus remarkably modifying their experimental signatures. We have computed the pole mass and the pole width of the KK gluon, triggered by its interaction with quarks, as well as the prediction for proton-proton cross-sections using the full propagator and compared it with that obtained from the usual Breit-Wigner approximation. We compare both approaches, along with the existing experimental data from ATLAS and CMS, for the t t ¯ $$ t\overline{t} $$ , t t ¯ W $$ t\overline{t}W $$ , t t ¯ Z $$ t\overline{t}Z $$ , t t ¯ H $$ t\overline{t}H $$ , and tt tt ¯ $$ tt\overline{tt} $$ channels. We have found differences between the two approaches of up to about 100%, highlighting that the effect of broad resonances can be dramatic on present, and mainly future, experimental searches. The channel tt tt ¯ $$ tt\overline{tt} $$ is particularly promising because the size of the cross-section signal is of the same order of magnitude as the Standard Model prediction, and future experimental analyses in this channel, especially for broad resonances, can shed light on the nature of possible physics beyond the Standard Model.https://doi.org/10.1007/JHEP05(2021)121Phenomenology of Field Theories in Higher Dimensions |
| spellingShingle | Rafel Escribano Mikel Mendizabal Mariano Quirós Emilio Royo On broad Kaluza-Klein gluons Journal of High Energy Physics Phenomenology of Field Theories in Higher Dimensions |
| title | On broad Kaluza-Klein gluons |
| title_full | On broad Kaluza-Klein gluons |
| title_fullStr | On broad Kaluza-Klein gluons |
| title_full_unstemmed | On broad Kaluza-Klein gluons |
| title_short | On broad Kaluza-Klein gluons |
| title_sort | on broad kaluza klein gluons |
| topic | Phenomenology of Field Theories in Higher Dimensions |
| url | https://doi.org/10.1007/JHEP05(2021)121 |
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