Combination of the searches for pair-produced vectorlike partners of the third-generation quarks at √s= 13 TeV with the ATLAS detector

0519312 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2915 autorů
Combination of the searches for pair-produced vectorlike partners of the third-generation quarks at √s= 13 TeV with the ATLAS detector.
Physical Review Letters. Roč. 121, č. 21 (2018), s. 1-20, č. článku 211801. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA MŠMT LM2015058
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * CERN LHC Coll * background * isospin * channel cross section: upper limit * experimental results
Obor OECD: Particles and field physics
Impakt faktor: 9.227, rok: 2018
Způsob publikování: Open access

A combination of the searches for pair-produced vectorlike partners of the top and bottom quarks in various decay channels (T→Zt/Wb/Ht, B→Zb/Wt/Hb) is performed using 36.1  fb-1 of pp collision data at s=13  TeV with the ATLAS detector at the Large Hadron Collider. The observed data are found to be in good agreement with the standard model background prediction in all individual searches. Therefore, combined 95% confidence-level upper limits are set on the production cross section for a range of vectorlike quark scenarios, significantly improving upon the reach of the individual searches. Model-independent limits are set assuming the vectorlike quarks decay to standard model particles. A singlet T is excluded for masses below 1.31 TeV and a singlet B is excluded for masses below 1.22 TeV. Assuming a weak isospin (T,B) doublet and |VTb|≪|VtB|, T and B masses below 1.37 TeV are excluded.
Trvalý link: http://hdl.handle.net/11104/0304312