Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector

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

doi:10.1103/PhysRevD.88.112006

Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector

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

Experimental Particle Physics

116 Citations (Scopus)

Abstract

A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb^-1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.

Original language	English
Article number	112006
Journal	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Volume	88
Issue number	11
ISSN	1550-7998
DOIs	https://doi.org/10.1103/PhysRevD.88.112006
Publication status	Published - 6 Dec 2013

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Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Khalek, S., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. D., Hansen, J. R., Jørgensen, M. D., Løvschall-Jensen, A. E., Boelaert, N. M. P., Mehlhase, S., Heisterkamp, S. J. F., Klinkby, E. B., Nilsson, B. S., Petersen, T. C., & Xella, S. (2013). Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector. Physical Review D (Particles, Fields, Gravitation and Cosmology), 88(11), [112006]. https://doi.org/10.1103/PhysRevD.88.112006

Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector. / Aad, G.; Abajyan, T.; Abbott, B. et al.

In: Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol. 88, No. 11, 112006, 06.12.2013.

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

Aad, G, Abajyan, T, Abbott, B, Abdallah, J, Khalek, S, Dam, M , Hansen, JB , Hansen, PH , Hansen, JD , Hansen, JR, Jørgensen, MD, Løvschall-Jensen, AE, Boelaert, NMP, Mehlhase, S, Heisterkamp, SJF, Klinkby, EB, Nilsson, BS, Petersen, TC & Xella, S 2013, 'Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector', Physical Review D (Particles, Fields, Gravitation and Cosmology), vol. 88, no. 11, 112006. https://doi.org/10.1103/PhysRevD.88.112006

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title = "Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector",

abstract = "A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb-1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.",

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AU - Abajyan, T.

AU - Abbott, B.

AU - Abdallah, J.

AU - Khalek, S.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, Jørn Dines

AU - Hansen, John Renner

AU - Jørgensen, Morten Dam

AU - Løvschall-Jensen, Ask Emil

AU - Boelaert, Nele Maria Philomena

AU - Mehlhase, Sascha

AU - Heisterkamp, Simon Johann Franz

AU - Klinkby, Esben Bryndt

AU - Nilsson, Björn Stefan

AU - Petersen, Troels Christian

AU - Xella, Stefania

PY - 2013/12/6

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N2 - A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb-1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.

AB - A search is presented for direct chargino production based on a disappearing-track signature using 20:3 fb-1 of proton-proton collisions at √s = 8 TeV collected with the ATLAS experiment at the LHC. In anomaly-mediated supersymmetry breaking (AMSB) models, the lightest chargino is nearly mass degenerate with the lightest neutralino and its lifetime is long enough to be detected in the tracking detectors by identifying decays that result in tracks with no associated hits in the outer region of the tracking system. Some models with supersymmetry also predict charginos with a significant lifetime. This analysis attains sensitivity for charginos with a lifetime between 0.1 and 10 ns, and significantly surpasses the reach of the LEP experiments. No significant excess above the background expectation is observed for candidate tracks with large transverse momentum, and constraints on chargino properties are obtained. In the AMSB scenarios, a chargino mass below 270 GeV is excluded at 95% confidence level.

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DO - 10.1103/PhysRevD.88.112006

M3 - Journal article

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JO - Physical Review D

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ER -

Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at root(s)=8 TeV with the ATLAS detector

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