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- Title
Search for a scalar partner of the top quark in the all-hadronic tt¯ plus missing transverse momentum final state at s=13 TeV with the ATLAS detector.
- Authors
Aad, G.; Abbott, B.; Abbott, D. C.; Abud, A. Abed; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; AbouZeid, O. S.; Abraham, N. L.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Achkar, B.; Adam, L.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Adelman, J.; Adersberger, M.
- Abstract
A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic t t ¯ plus missing transverse momentum final state is presented. The analysis of 139 fb - 1 of s = 13 TeV proton–proton collision data collected using the ATLAS detector at the LHC yields no significant excess over the Standard Model background expectation. To interpret the results, a supersymmetric model is used where the top squark decays via t ~ → t (∗) χ ~ 1 0 , with t (∗) denoting an on-shell (off-shell) top quark and χ ~ 1 0 the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where m t ~ > m t + m χ ~ 1 0 , top squark masses are excluded in the range 400–1250 GeV for χ ~ 1 0 masses below 200 GeV at 95% confidence level. In the situation where m t ~ ∼ m t + m χ ~ 1 0 , top squark masses in the range 300–630 GeV are excluded, while in the case where m t ~ < m W + m b + m χ ~ 1 0 (with m t ~ - m χ ~ 1 0 ≥ 5 GeV), considered for the first time in an ATLAS all-hadronic search, top squark masses in the range 300–660 GeV are excluded. Limits are also set for scalar third-generation up-type leptoquarks, excluding leptoquarks with masses below 1240 GeV when considering only leptoquark decays into a top quark and a neutrino.
- Subjects
ATLAS Mountains; TOP quarks; LEPTOQUARKS; SFERMION; PAIR production; DETECTORS; PROTON-proton interactions; SUPERSYMMETRY
- Publication
European Physical Journal C -- Particles & Fields, 2020, Vol 80, Issue 8, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-020-8102-8