TY  - JOUR
AU  - ATLAS Collaboration (Aad, G. et al
AU  - Aparisi Pozo, J. A.
AU  - Bailey, A. J.
AU  - Cabrera Urban, S.
AU  - Castillo, F. L.
AU  - Castillo Gimenez, V.
AU  - Costa, M. J.
AU  - Escobar, C.
AU  - Estrada Pastor, O.
AU  - Ferrer, A.
AU  - Fiorini, L.
AU  - Fullana Torregrosa, E.
AU  - Fuster, J.
AU  - Garcia, C.
AU  - Garcia Navarro, J. E.
AU  - Gonzalez de la Hoz, S.
AU  - Gonzalvo Rodriguez, G. R.
AU  - Guerrero Rojas, J. G. R.
AU  - Higon-Rodriguez, E.
AU  - Lacasta, C.
AU  - Lozano Bahilo, J. J.
AU  - Madaffari, D.
AU  - Mamuzic, J.
AU  - Marti-Garcia, S.
AU  - Martinez Agullo, P.
AU  - Mitsou, V. A.
AU  - Moreno Llacer, M.
AU  - Poveda, J.
AU  - Rodriguez Bosca, S.
AU  - Ruiz-Martinez, A.
AU  - Salt, J.
AU  - Santra, A.
AU  - Sayago Galvan, I.
AU  - Soldevila, U.
AU  - Sanchez, J.
AU  - Valero, A.
AU  - Valls Ferrer, J. A.
AU  - Vos, M.
PY  - 2020
DA  - 2020//
TI  - Search for a scalar partner of the top quark in the all-hadronic t(t)over-bar plus missing transverse momentum final state at root s=13 TeV with the ATLAS detector
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 737 - 44pp
VL  - 80
IS  - 8
PB  - Springer
AB  - 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) over bar plus missing transverse momentum final state is presented. The analysis of 139 fb(-1) of root 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) over tilde -> t(*) (chi) over tilde (0)(1), with t(*) denoting an on-shell (off-shell) top quark and (chi) over tilde (0)(1) the lightest neutralino. Three specific event selections are optimised for the following scenarios. In the scenario where m((t) over tilde) > m(t) + m((chi) over tilde 10), top squark masses are excluded in the range 400-1250 GeV for (chi) over tilde (0)(1) masses below 200 GeV at 95% confidence level. In the situation where m((t) over tilde) similar to m(t) + m((chi) over tilde 10), top squarkmasses in the range 300-630 GeV are excluded, while in the case where m((t) over tilde) < m(W) + m(b) + m(<(chi)over tilde>10) (with m((t) over tilde) – m((chi) over tilde 10) >= 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.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2004.14060
UR  - https://doi.org/10.1140/epjc/s10052-020-8102-8
DO  - 10.1140/epjc/s10052-020-8102-8
LA  - English
N1  - WOS:000615182800002
ID  - ATLASCollaborationAad_etal2020
ER  -