Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons

G. Aad; Mogens Dam; Nele Maria Philomena Boelaert; Jørgen Beck Hansen; John Renner Hansen; Jørn Dines Hansen; Peter Henrik Hansen; Simon Johann Franz Heisterkamp; Morten Dam Jørgensen; Sascha Mehlhase; Esben Bryndt Klinkby; Björn Stefan Nilsson; Troels Christian Petersen; Ask Emil Løvschall-Jensen; Stefania Xella

doi:10.1103/PhysRevLett.109.032001

Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons

G. Aad, Mogens Dam, Nele Maria Philomena Boelaert, Jørgen Beck Hansen, John Renner Hansen, Jørn Dines Hansen, Peter Henrik Hansen, Simon Johann Franz Heisterkamp, Morten Dam Jørgensen, Sascha Mehlhase, Esben Bryndt Klinkby, Björn Stefan Nilsson, Troels Christian Petersen, Ask Emil Løvschall-Jensen, Stefania Xella

46 Citations (Scopus)

Abstract

This Letter presents a search for pair production of heavy down-type quarks decaying via b ^′→Wt in the lepton+jets channel, as b ^′b ^̄′→W ^-tW ⁺t̄→bb̄W ⁺W ^-W ⁺W ^-→l ^±νbb̄qq̄qq̄qq̄. In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04fb ^-1 from pp collisions at √s=7TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480GeV can be excluded at the 95% confidence level.

Original language	English
Journal	Physical Review Letters
Volume	109
Issue number	3
Pages (from-to)	032001
Number of pages	19
ISSN	0031-9007
DOIs	https://doi.org/10.1103/PhysRevLett.109.032001
Publication status	Published - 20 Jul 2012

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Aad, G., Dam, M., Boelaert, N. M. P., Hansen, J. B., Hansen, J. R., Hansen, J. D., Hansen, P. H., Heisterkamp, S. J. F., Jørgensen, M. D., Mehlhase, S., Klinkby, E. B., Nilsson, B. S., Petersen, T. C., Løvschall-Jensen, A. E., & Xella, S. (2012). Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons. Physical Review Letters, 109(3), 032001. https://doi.org/10.1103/PhysRevLett.109.032001

Aad, G, Dam, M, Boelaert, NMP, Hansen, JB , Hansen, JR , Hansen, JD , Hansen, PH, Heisterkamp, SJF, Jørgensen, MD, Mehlhase, S, Klinkby, EB, Nilsson, BS, Petersen, TC, Løvschall-Jensen, AE & Xella, S 2012, 'Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons', Physical Review Letters, vol. 109, no. 3, pp. 032001. https://doi.org/10.1103/PhysRevLett.109.032001

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title = "Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons",

abstract = "This Letter presents a search for pair production of heavy down-type quarks decaying via b ′→Wt in the lepton+jets channel, as b ′b{\= }′→W -tW +{\=t}→b{\=b}W +W -W +W -→l ±νb{\=b}q{\=q}q{\=q}q{\=q}. In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04fb -1 from pp collisions at √s=7TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480GeV can be excluded at the 95% confidence level.",

author = "G. Aad and Mogens Dam and Boelaert, {Nele Maria Philomena} and Hansen, {J{\o}rgen Beck} and Hansen, {John Renner} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and Heisterkamp, {Simon Johann Franz} and J{\o}rgensen, {Morten Dam} and Sascha Mehlhase and Klinkby, {Esben Bryndt} and Nilsson, {Bj{\"o}rn Stefan} and Petersen, {Troels Christian} and L{\o}vschall-Jensen, {Ask Emil} and Stefania Xella",

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T1 - Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons

AU - Aad, G.

AU - Dam, Mogens

AU - Boelaert, Nele Maria Philomena

AU - Hansen, Jørgen Beck

AU - Hansen, John Renner

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Heisterkamp, Simon Johann Franz

AU - Jørgensen, Morten Dam

AU - Mehlhase, Sascha

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

AU - Petersen, Troels Christian

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

PY - 2012/7/20

Y1 - 2012/7/20

N2 - This Letter presents a search for pair production of heavy down-type quarks decaying via b ′→Wt in the lepton+jets channel, as b ′b ̄′→W -tW +t̄→bb̄W +W -W +W -→l ±νbb̄qq̄qq̄qq̄. In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04fb -1 from pp collisions at √s=7TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480GeV can be excluded at the 95% confidence level.

AB - This Letter presents a search for pair production of heavy down-type quarks decaying via b ′→Wt in the lepton+jets channel, as b ′b ̄′→W -tW +t̄→bb̄W +W -W +W -→l ±νbb̄qq̄qq̄qq̄. In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04fb -1 from pp collisions at √s=7TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480GeV can be excluded at the 95% confidence level.

U2 - 10.1103/PhysRevLett.109.032001

DO - 10.1103/PhysRevLett.109.032001

M3 - Journal article

C2 - 22861838

SN - 0031-9007

VL - 109

SP - 032001

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

ER -

Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons

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