• Open Access

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

G. Aad et al. (ATLAS Collaboration)
Phys. Rev. D 88, 112006 – Published 6 December 2013

Abstract

A search is presented for direct chargino production based on a disappearing-track signature using 20.3fb1 of proton-proton collisions at s=8TeV 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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  • Received 14 October 2013

DOI:https://doi.org/10.1103/PhysRevD.88.112006

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2013 CERN, for the ATLAS Collaboration

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Vol. 88, Iss. 11 — 1 December 2013

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