Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

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

doi:10.1016/j.physletb.2012.07.010

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

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

24 Citations (Scopus)

Abstract

The results of a search for pair production of the lighter scalar partners of top quarks (t~1) in 2.05 fb ^-1 of pp collisions at s=7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e, μ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking 'natural' scenarios, where the neutralino (χ~10) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115GeV<mχ~10<230GeV at 95% confidence level, reaching an exclusion of mt~1<330GeV for mχ~10=190GeV. Scalar top quark masses below 240 GeV are excluded for all values of mχ~10>mZ.

Original language	English
Journal	Physics Letters B
Volume	715
Issue number	1-3
Pages (from-to)	44-60
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2012.07.010
Publication status	Published - 29 Aug 2012

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10.1016/j.physletb.2012.07.010

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Aad, G., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. D., Hansen, J. R., Heisterkamp, S. J. F., Jørgensen, M. D., Boelaert, N. M. P., Mehlhase, S., Klinkby, E. B., Petersen, T. C., Nilsson, B. S., Løvschall-Jensen, A. E., & Xella, S. (2012). Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV. Physics Letters B, 715(1-3), 44-60. https://doi.org/10.1016/j.physletb.2012.07.010

Aad, G, Dam, M , Hansen, JB , Hansen, PH , Hansen, JD , Hansen, JR, Heisterkamp, SJF, Jørgensen, MD, Boelaert, NMP, Mehlhase, S, Klinkby, EB, Petersen, TC, Nilsson, BS, Løvschall-Jensen, AE & Xella, S 2012, 'Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV', Physics Letters B, vol. 715, no. 1-3, pp. 44-60. https://doi.org/10.1016/j.physletb.2012.07.010

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title = "Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV",

abstract = " The results of a search for pair production of the lighter scalar partners of top quarks (t~1) in 2.05 fb -1 of pp collisions at s=7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e, μ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking 'natural' scenarios, where the neutralino (χ~10) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115GeVmZ.",

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

year = "2012",

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doi = "10.1016/j.physletb.2012.07.010",

language = "English",

volume = "715",

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journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

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T1 - Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

AU - Aad, G.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Heisterkamp, Simon Johann Franz

AU - Jørgensen, Morten Dam

AU - Boelaert, Nele Maria Philomena

AU - Mehlhase, Sascha

AU - Klinkby, Esben Bryndt

AU - Petersen, Troels Christian

AU - Nilsson, Björn Stefan

AU - Løvschall-Jensen, Ask Emil

AU - Xella, Stefania

PY - 2012/8/29

Y1 - 2012/8/29

N2 - The results of a search for pair production of the lighter scalar partners of top quarks (t~1) in 2.05 fb -1 of pp collisions at s=7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e, μ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking 'natural' scenarios, where the neutralino (χ~10) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115GeVmZ.

AB - The results of a search for pair production of the lighter scalar partners of top quarks (t~1) in 2.05 fb -1 of pp collisions at s=7 TeV using the ATLAS experiment at the LHC are reported. Scalar top quarks are searched for in events with two same flavour opposite-sign leptons (e, μ) with invariant mass consistent with the Z boson mass, large missing transverse momentum and jets in the final state. At least one of the jets is identified as originating from a b-quark. No excess over Standard Model expectations is found. The results are interpreted in the framework of R-parity conserving, gauge mediated Supersymmetry breaking 'natural' scenarios, where the neutralino (χ~10) is the next-to-lightest supersymmetric particle. Scalar top quark masses up to 310 GeV are excluded for 115GeVmZ.

U2 - 10.1016/j.physletb.2012.07.010

DO - 10.1016/j.physletb.2012.07.010

M3 - Journal article

SN - 0370-2693

VL - 715

SP - 44

EP - 60

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

IS - 1-3

ER -

Search for scalar top quark pair production in natural gauge mediated supersymmetry models with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV

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