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 - Journal Article
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 … Total 2915 authors
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
R&D Projects: GA MŠMT LM2015058
Institutional support: RVO:68378271
Keywords : ATLAS * CERN LHC Coll * background * isospin * channel cross section: upper limit * experimental results
OECD category: Particles and field physics
Impact factor: 9.227, year: 2018
Method of publishing: 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.
Permanent Link: http://hdl.handle.net/11104/0304312