Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector

0501161 - FZÚ 2019 RIV US eng J - Journal Article
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Kůs, Vlastimil - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … Total 2864 authors
Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector.
Journal of High Energy Physics. Roč. 2017, č. 12 (2017), s. 1-56, č. článku 85. ISSN 1029-8479. E-ISSN 1029-8479
R&D Projects: GA MŠMT LM2015058
Institutional support: RVO:68378271
Keywords : ATLAS * CERN LHC Coll * supersymmetry * background * chargino * squark: pair production * stop: mass: lower limit * experimental results * 13000 GeV-cms
OECD category: Particles and field physics
Impact factor: 5.541, year: 2017

A search for pair production of a scalar partner of the top quark in events with four or more jets plus missing transverse momentum is presented. An analysis of 36.1 fb−1 of √s=13 TeV proton-proton collisions collected using the ATLAS detector at the LHC yields no significant excess over the expected Standard Model background. To interpret the results a simplified supersymmetric model is used where the top squark is assumed to decay via t~1→t(∗)upchi~01 and t~1→bupchi~±1→bW(∗)upchi~01 , where χ01 (χ±1 ) denotes the lightest neutralino (chargino). Exclusion limits are placed in terms of the top-squark and neutralino masses. Assuming a branching ratio of 100% to tupchi~01 , top-squark masses in the range 450–1000 GeV are excluded for upchi~01 masses below 160 GeV. In the case where mt~1∼mt+mχ~01 , top-squark masses in the range 235–590 GeV are excluded.

Permanent Link: http://hdl.handle.net/11104/0293150