Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector

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

doi:10.1007/JHEP10(2013)189

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector

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

Experimental Particle Physics

113 Citations (Scopus)

Abstract

The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb⁻¹ of pp collisions at √s = 8TeV collected by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b₁ and t₁ respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parityconserving models in which either the bottom or the top squark is the lightest squark. The b₁ is assumed to decay via b₁ → bχ⁰ ₁ and the t₁ via t₁ → bχ^± ₁, with undetectable products of the subsequent decay of the χ^± ₁ due to the small mass splitting between the χ^± ₁ and the χ⁰ ₁.

Original language	English
Article number	189
Journal	Journal of High Energy Physics (Online)
Volume	2013
Issue number	10
ISSN	1126-6708
DOIs	https://doi.org/10.1007/JHEP10(2013)189
Publication status	Published - 1 Dec 2013

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Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Khalek, A. S., Dam, M., Hansen, J. B., Hansen, J. D., Hansen, J. R., Hansen, P. H., Boelaert, N. M. P., Jørgensen, M. D., Heisterkamp, S. J. F., Klinkby, E. B., Nilsson, B. S., Løvschall-Jensen, A. E., Mehlhase, S., Petersen, T. C., & Xella, S. (2013). Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector. Journal of High Energy Physics (Online), 2013(10), Article 189. https://doi.org/10.1007/JHEP10(2013)189

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector. / Aad, G.; Abajyan, T.; Abbott, B. et al.
In: Journal of High Energy Physics (Online), Vol. 2013, No. 10, 189, 01.12.2013.

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

Aad, G, Abajyan, T, Abbott, B, Abdallah, J, Khalek, AS, Dam, M , Hansen, JB , Hansen, JD , Hansen, JR , Hansen, PH, Boelaert, NMP, Jørgensen, MD, Heisterkamp, SJF, Klinkby, EB, Nilsson, BS, Løvschall-Jensen, AE, Mehlhase, S, Petersen, TC & Xella, S 2013, 'Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector', Journal of High Energy Physics (Online), vol. 2013, no. 10, 189. https://doi.org/10.1007/JHEP10(2013)189

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abstract = "The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb−1 of pp collisions at √s = 8TeV collected by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b1 and t1 respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parityconserving models in which either the bottom or the top squark is the lightest squark. The b1 is assumed to decay via b1 → bχ0 1 and the t1 via t1 → bχ± 1, with undetectable products of the subsequent decay of the χ± 1 due to the small mass splitting between the χ± 1 and the χ0 1.",

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AU - Abajyan, T.

AU - Abbott, B.

AU - Abdallah, J.

AU - Khalek, A.S.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Hansen, Peter Henrik

AU - Boelaert, Nele Maria Philomena

AU - Jørgensen, Morten Dam

AU - Heisterkamp, Simon Johann Franz

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

AU - Løvschall-Jensen, Ask Emil

AU - Mehlhase, Sascha

AU - Petersen, Troels Christian

AU - Xella, Stefania

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N2 - The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb−1 of pp collisions at √s = 8TeV collected by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b1 and t1 respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parityconserving models in which either the bottom or the top squark is the lightest squark. The b1 is assumed to decay via b1 → bχ0 1 and the t1 via t1 → bχ± 1, with undetectable products of the subsequent decay of the χ± 1 due to the small mass splitting between the χ± 1 and the χ0 1.

AB - The results of a search for pair production of supersymmetric partners of the Standard Model third-generation quarks are reported. This search uses 20.1 fb−1 of pp collisions at √s = 8TeV collected by the ATLAS experiment at the Large Hadron Collider. The lightest bottom and top squarks (b1 and t1 respectively) are searched for in a final state with large missing transverse momentum and two jets identified as originating from b-quarks. No excess of events above the expected level of Standard Model background is found. The results are used to set upper limits on the visible cross section for processes beyond the Standard Model. Exclusion limits at the 95% confidence level on the masses of the third-generation squarks are derived in phenomenological supersymmetric R-parityconserving models in which either the bottom or the top squark is the lightest squark. The b1 is assumed to decay via b1 → bχ0 1 and the t1 via t1 → bχ± 1, with undetectable products of the subsequent decay of the χ± 1 due to the small mass splitting between the χ± 1 and the χ0 1.

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DO - 10.1007/JHEP10(2013)189

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JO - Journal of High Energy Physics (Online)

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M1 - 189

ER -

Search for direct third-generation squark pair production in final states with missing transverse momentum and two b-jets in root s=8 TeV pp collisions with the ATLAS detector

Abstract

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