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

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Search for pair production of heavy vector-like quarks decaying into hadronic final states in pp collisions at √s = 13 TeV with the ATLAS detector. Physical review. D - particles, fields, gravitation, and cosmology, 98(9) American Physical Society 10.1103/PhysRevD.98.092005

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A search is presented for the pair production of heavy vectorlike quarks, TT̅ or BB̅, that decay into final states with jets and no reconstructed leptons. Jets in the final state are classified using a deep neural networkas arising from hadronically decaying W/Z bosons, Higgs bosons, top quarks, or background. The analysis uses data from the ATLAS experiment corresponding to 36.1fb⁻¹ of proton-proton collisions with acenter-of-mass energy of √s = 13TeV 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 B→Wt, Hb, Zb, for a variety of branching ratios. At 95% confidence level, theobserved (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 andT→Ht, where these results are strongest, are 1010 (970) GeV and 1010 (1010) GeV, respectively.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

BORIS Import LHEP

Date Deposited:

18 Jun 2019 08:27

Last Modified:

24 Oct 2019 16:50

Publisher DOI:

10.1103/PhysRevD.98.092005

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwaehnt

BORIS DOI:

10.7892/boris.129020

URI:

https://boris.unibe.ch/id/eprint/129020

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