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https://hdl.handle.net/10316/107572
Título: | Search for dark matter produced in association with bottom or top quarks in √s=13 TeV pp collisions with the ATLAS detector | Autor: | Santos, S. P. Amor dos Fiolhais, M. C. N. Galhardo, B. Veloso, F. Wolters, H. ATLAS Collaboration |
Data: | 2018 | Editora: | Springer Nature | Título da revista, periódico, livro ou evento: | European Physical Journal C | Volume: | 78 | Número: | 1 | Resumo: | A search for weakly interacting massive darkmatter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √ s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of darkmatter particles, mediator masses below50GeVare excluded assuming a dark-matter candidatemass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements. | URI: | https://hdl.handle.net/10316/107572 | DOI: | 10.1140/epjc/s10052-017-5486-1 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Física - Artigos em Revistas Internacionais |
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Search-for-dark-matter-produced-in-association-with-bottom-or-top-quarks-in-s13-TeV-pp-collisions-with-the-ATLAS-detectorEuropean-Physical-Journal-C.pdf | 2.12 MB | Adobe PDF | Ver/Abrir |
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