Combination of the Searches for Pair -Produced Vectorlike Partners of the Third -Generation Quarks at s =13 TeV with the ATLAS Detector

Collaboration, ATLAS and Barton, A.E. and Bertram, I.A. and Borissov, G. and Bouhova -Thacker, E.V. and Burke, S. and Cao, Y. and Catmore, J.R. and Fox, H. and Henderson, R.C.W. and Hou, S. and Hunter, R.F.H. and Janssen, J. and Jones, R.W.L. and Kartvelishvili, V. and Long, R.E. and Ma, Y. and Meng, X.T. and Muenstermann, D. and Price, D. and Robinson, J.E.M. and Sen, S. and Smizanska, M. and Solovyev, V. and Sopczak, A. and Tee, A.S. and Walder, J. and Wang, C. and Wharton, A.M. and Whitmore, B.W. and Yamazaki, Y. and Ye, S. (2018) 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, 121 (21). ISSN 1079-7114

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Abstract

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|â‰|VtB|, T and B masses below 1.37 TeV are excluded. © 2018 CERN. for the ATLAS Collaboration.

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Journal Article
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Physical review letters
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29 Jan 2019 11:10
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