Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √s = 8 TeV with the ATLAS detector
Name
Aad-2013-Search for charginos.pdf
Size
721.67 KB
Format
Adobe PDF
Checksum (MD5)
5f81e2678a9bfeb45a7c77284660245d
Author(s)
Taylor, Frank E.
Date Issued
December 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Search for charginos nearly mass degenerate with the lightest neutralino based on a disappearing-track signature in pp collisions at √s = 8 TeV with the ATLAS detector.” Phys. Rev. D 88, no. 11 (December 2013). © 2013 CERN, for the ATLAS Collaboration
Version
Final published version
Abstract
A search is presented for direct chargino production based on a disappearing-track signature using 20.3 fb[superscript −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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.112006
