A search is described for the production of a pair of bottom-type vectorlike quarks (VLQs), each decaying into a b or ¯b quark and either a Higgs or a Z boson, with a mass greater than 1000 GeV. The analysis is based on data from proton-proton collisions at a 13 TeV center-of-mass energy recorded at the CERN LHC, corresponding to a total integrated luminosity of 137 fb−1. As the predominant decay modes of the Higgs and Z bosons are to a pair of quarks, the analysis focuses on final states consisting of jets resulting from the six quarks produced in the events. Since the two jets produced in the decay of a highly Lorentz-boosted Higgs or Z boson can merge to form a single jet, nine independent analyses are performed, categorized by the number of observed jets and the reconstructed event mode. No signal in excess of the expected background is observed. Lower limits are set on the VLQ mass at 95% confidence level equal to 1570 GeV in the case where the VLQ decays exclusively to a b quark and a Higgs boson, 1390 GeV for when it decays exclusively to a b quark and a Z boson, and 1450 GeV for when it decays equally in these two modes. These limits represent significant improvements over the previously published VLQ limits.

(2020). Search for bottom-type, vectorlike quark pair production in a fully hadronic final state in proton-proton collisions at √s=13 TeV [journal article - articolo]. In PHYSICAL REVIEW D. Retrieved from http://hdl.handle.net/10446/171523

Search for bottom-type, vectorlike quark pair production in a fully hadronic final state in proton-proton collisions at √s=13 TeV

Re, V.;Vai, I.;
2020-01-01

Abstract

A search is described for the production of a pair of bottom-type vectorlike quarks (VLQs), each decaying into a b or ¯b quark and either a Higgs or a Z boson, with a mass greater than 1000 GeV. The analysis is based on data from proton-proton collisions at a 13 TeV center-of-mass energy recorded at the CERN LHC, corresponding to a total integrated luminosity of 137 fb−1. As the predominant decay modes of the Higgs and Z bosons are to a pair of quarks, the analysis focuses on final states consisting of jets resulting from the six quarks produced in the events. Since the two jets produced in the decay of a highly Lorentz-boosted Higgs or Z boson can merge to form a single jet, nine independent analyses are performed, categorized by the number of observed jets and the reconstructed event mode. No signal in excess of the expected background is observed. Lower limits are set on the VLQ mass at 95% confidence level equal to 1570 GeV in the case where the VLQ decays exclusively to a b quark and a Higgs boson, 1390 GeV for when it decays exclusively to a b quark and a Z boson, and 1450 GeV for when it decays equally in these two modes. These limits represent significant improvements over the previously published VLQ limits.
articolo
7-dic-2020
2020
Inglese
cartaceo
online
102
11 (art. n. 2004)
1
30
Settore FIS/01 - Fisica Sperimentale
Funded by SCOAP3.
Sirunyan, A.  M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lec...espandi
info:eu-repo/semantics/article
open
(2020). Search for bottom-type, vectorlike quark pair production in a fully hadronic final state in proton-proton collisions at √s=13 TeV [journal article - articolo]. In PHYSICAL REVIEW D. Retrieved from http://hdl.handle.net/10446/171523
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/171523
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