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

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posted on 2023-06-09, 18:54 authored by N L Abraham, Benedict AllbrookeBenedict Allbrooke, Lily AsquithLily Asquith, Alessandro CerriAlessandro Cerri, Samuel Jones, Antonella De SantoAntonella De Santo, Fabrizio SalvatoreFabrizio Salvatore, Kate ShawKate Shaw, Thomas StevensonThomas Stevenson, K Suruliz, Mark SuttonMark Sutton, F Tresoldi, Fabrizio Trovato, Iacopo Vivarelli, The ATLAS Collaboration, others
A search is presented for the pair production of heavy vectorlike quarks, T¯T or B¯B, 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 vs=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.

History

Publication status

  • Published

File Version

  • Published version

Journal

Physical Review D

ISSN

2470-0010

Publisher

American Physical Society

Issue

9

Volume

98

Page range

1-36

Article number

a092005

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-09-20

First Open Access (FOA) Date

2019-09-20

First Compliant Deposit (FCD) Date

2019-09-03

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