Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector

G. Aad; B. Abbott; J. Abdallah; S. Abdel Khalek; O. Abdinov; R. Aben; B. Abi; M. Abolins; O.S. AbouZeid; H. Abramowicz; Mogens Dam; Jørn Dines Hansen; Jørgen Beck Hansen; Troels Christian Petersen; Peter Henrik Hansen; Stefania Xella; Lotte Ansgaard Thomsen; Lars Egholm Pedersen; Gorm Aske Gram Krohn Galster; Graig Wiglesworth; James William Monk; Ask Emil Løvschall-Jensen; Alejandro Alonso Diaz; Almut Maria Pingel; Morten Dam Jørgensen; Sascha Mehlhase

doi:10.1140/epjc/s10052-014-2883-6

Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, B. Abi, M. Abolins, O.S. AbouZeid, H. Abramowicz, Mogens Dam, Jørn Dines Hansen, Jørgen Beck Hansen, Troels Christian Petersen, Peter Henrik Hansen, Stefania Xella, Lotte Ansgaard Thomsen, Lars Egholm Pedersen, Gorm Aske Gram Krohn Galster, Graig WiglesworthJames William Monk, Ask Emil Løvschall-Jensen, Alejandro Alonso Diaz, Almut Maria Pingel, Morten Dam Jørgensen, Sascha Mehlhase

Experimental Particle Physics

33 Citations (Scopus)

Abstract

A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at √s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb⁻¹. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t₂) followed by the decay to the lighter top squark state (t₁) via t₂ → Zt₁, and for t₁ pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ ₀₁) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G ) via the χ ₀₁ → Z G process.

Original language	English
Article number	2883
Journal	The European Physical Journal C: Particles and Fields
Volume	74
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-014-2883-6
Publication status	Published - 3 Jun 2014

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Aad, G., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdinov, O., Aben, R., Abi, B., Abolins, M., AbouZeid, O. S., Abramowicz, H., Dam, M., Hansen, J. D., Hansen, J. B., Petersen, T. C., Hansen, P. H., Xella, S., Thomsen, L. A., Pedersen, L. E., Galster, G. A. G. K., ... Mehlhase, S. (2014). Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector. The European Physical Journal C: Particles and Fields, 74, [2883]. https://doi.org/10.1140/epjc/s10052-014-2883-6

Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector. / Aad, G.; Abbott, B.; Abdallah, J. et al.

In: The European Physical Journal C: Particles and Fields, Vol. 74, 2883, 03.06.2014.

Research output: Contribution to journal › Journal article › Research › peer-review

Aad, G, Abbott, B, Abdallah, J, Abdel Khalek, S, Abdinov, O, Aben, R, Abi, B, Abolins, M, AbouZeid, OS, Abramowicz, H, Dam, M , Hansen, JD , Hansen, JB , Petersen, TC , Hansen, PH , Xella, S, Thomsen, LA, Pedersen, LE, Galster, GAGK, Wiglesworth, G, Monk, JW, Løvschall-Jensen, AE, Alonso Diaz, A, Pingel, AM, Jørgensen, MD & Mehlhase, S 2014, 'Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector', The European Physical Journal C: Particles and Fields, vol. 74, 2883. https://doi.org/10.1140/epjc/s10052-014-2883-6

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title = "Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector",

abstract = "A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at √s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb−1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t2) followed by the decay to the lighter top squark state (t1) via t2 → Zt1, and for t1 pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ 01) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G ) via the χ 01 → Z G process.",

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T1 - Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdel Khalek, S.

AU - Abdinov, O.

AU - Aben, R.

AU - Abi, B.

AU - Abolins, M.

AU - AbouZeid, O.S.

AU - Abramowicz, H.

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Petersen, Troels Christian

AU - Hansen, Peter Henrik

AU - Xella, Stefania

AU - Thomsen, Lotte Ansgaard

AU - Pedersen, Lars Egholm

AU - Galster, Gorm Aske Gram Krohn

AU - Wiglesworth, Graig

AU - Monk, James William

AU - Løvschall-Jensen, Ask Emil

AU - Alonso Diaz, Alejandro

AU - Pingel, Almut Maria

AU - Jørgensen, Morten Dam

AU - Mehlhase, Sascha

PY - 2014/6/3

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N2 - A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at √s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb−1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t2) followed by the decay to the lighter top squark state (t1) via t2 → Zt1, and for t1 pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ 01) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G ) via the χ 01 → Z G process.

AB - A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b-quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at √s = 8 TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb−1. No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state (t2) followed by the decay to the lighter top squark state (t1) via t2 → Zt1, and for t1 pair production in natural gaugemediated supersymmetry breaking scenarios where the neutralino (χ 01) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino (G ) via the χ 01 → Z G process.

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DO - 10.1140/epjc/s10052-014-2883-6

M3 - Journal article

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JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

M1 - 2883

ER -

Search for direct top squark pair production in events with a Z boson, b-jets and missing transverse momentum in √s = 8 TeV pp collisions with the ATLAS detector

Abstract

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