Search for long-lived charginos based on a disappearing-track signature in pp collisions at s √ =13 s=13 TeV with the ATLAS detector

The ATLAS Collaboration, , Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Jones, S, Lerner, G, Miano, F, Salvatore, F, Santoyo Castillo, I, Shehu, C Y, Suruliz, K, Shaw, K, Sutton, M R, Tresoldi, F, Vivarelli, I, Winkels, E, Winston, O J and others, (2018) Search for long-lived charginos based on a disappearing-track signature in pp collisions at s √ =13 s=13 TeV with the ATLAS detector. Journal of High Energy Physics, 6 (22). pp. 1-47. ISSN 1126-6708

[img] PDF - Published Version
Available under License Creative Commons Attribution.

Download (1MB)

Abstract

This paper presents a search for direct electroweak gaugino or gluino pair production with a chargino nearly mass-degenerate with a stable neutralino. It is based on an integrated luminosity of 36.1 fb−1 of pp collisions at s √ =13 s=13 TeV collected by the ATLAS experiment at the LHC. The final state of interest is a disappearing track accompanied by at least one jet with high transverse momentum from initial-state radiation or by four jets from the gluino decay chain. The use of short track segments reconstructed from the innermost tracking layers significantly improves the sensitivity to short chargino lifetimes. The results are found to be consistent with Standard Model predictions. Exclusion limits are set at 95% confidence level on the mass of charginos and gluinos for different chargino lifetimes. For a pure wino with a lifetime of about 0.2 ns, chargino masses up to 460 GeV are excluded. For the strong production channel, gluino masses up to 1.65 TeV are excluded assuming a chargino mass of 460 GeV and lifetime of 0.2 ns.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Experimental Particle Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 08 Nov 2018 14:02
Last Modified: 31 Jan 2019 18:08
URI: http://srodev.sussex.ac.uk/id/eprint/80070

View download statistics for this item

📧 Request an update