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Title

Search for pair production of heavy vectorlike quarks decaying into hadronic final states in pp collisions at √s = 13 TeV with the ATLAS detector

CollaborationWith : Akilli, Ece / Amrouche, Cherifa Sabrina / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Fawcett, William / Ferrere, Didier / Gadatsch, Stefan / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Iizawa, Tomoya / Jansky, Roland / Khoo, Teng Jian / Kiehn, Moritz / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Paolozzi, Lorenzo / Poggi, Riccardo / Salamani, Dalila / Schramm, Steven / Sfyrla, Anna / Sultan, D M S / Valente, Marco / Wu, Xin / Zaffaroni, Ettore
Published in Physical Review. D. 2018, vol. 98, no. 9
Collection Open Access - SCOAP3
Abstract A search is presented for the pair production of heavy vectorlike quarks, TT¯ or BB¯, that decay into final states with jets and no reconstructed leptons. Jets in the final state are classified using a deep neural network as arising from hadronically decaying W/Z bosons, Higgs bosons, top quarks, or background. The analysis uses data from the ATLAS experiment corresponding to 36.1 fb−1 of proton-proton collisions with a center-of-mass energy of s=13 TeV delivered by the Large Hadron Collider in 2015 and 2016. No significant deviation from the Standard Model expectation is observed. Results are interpreted assuming the vectorlike quarks decay into a Standard Model boson and a third-generation-quark, T→Wb,Ht,Zt or B→Wt,Hb,Zb, for a variety of branching ratios. At 95% confidence level, the observed (expected) lower limit on the vectorlike B-quark mass for a weak-isospin doublet (B, Y) is 950 (890) GeV, and the lower limits on the masses for the pure decays B→Hb and T→Ht, where these results are strongest, are 1010 (970) GeV and 1010 (1010) GeV, respectively.
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arXiv: 1808.01771
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ATLAS COLLABORATION. Search for pair production of heavy vectorlike quarks decaying into hadronic final states in pp collisions at √s = 13 TeV with the ATLAS detector. In: Physical Review. D, 2018, vol. 98, n° 9. https://archive-ouverte.unige.ch/unige:111801

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Deposited on : 2018-12-04

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