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Search for top squarks decaying via four-body or chargino-mediated modes in single-lepton final states in proton-proton collisions at ?s=13 TeV

Abstract: A search for the pair production of the lightest supersymmetric partner of the top quark (t ? 1) is presented. The search focuses on a compressed scenario where the mass difference between the top squark and the lightest supersymmetric particle, often considered to be the lightest neutralino (??10), is smaller than the mass of the W boson. The proton-proton collision data were recorded by the CMS experiment at a centre-of-mass energy of 13 TeV, and correspond to an integrated luminosity of 35.9 fb?1. In this search, two decay modes of the top squark are considered: a four-body decay into a bottom quark, two additional fermions, and a ??10; and a decay via an intermediate chargino. Events are selected using the presence of a high-momentum jet, significant missing transverse momentum, and a low transverse momentum electron or muon. Two analysis techniques are used, targeting different decay modes of the t ? 1: a sequential selection and a multivariate technique. No evidence for the production of top squarks is found, and mass limits at 95% confidence level are set that reach up to 560 GeV, depending on the m(t?1)?m(??10) mass difference and the decay mode.

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 Fuente: Journal of High Energy Physics, Vol. 2018, Num. 09, Art. Num. 065

Editorial: Springer Verlag

 Fecha de publicación: 12/09/2018

Nº de páginas: 47

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP09(2018)065

ISSN: 1126-6708,1029-8479

Url de la publicación: https://doi.org/10.1007/JHEP09(2018)065