title: Monojetlike Searches for Top Squarks with a b Tag.
abstract: The LHC searches for light compressed top squarks have resulted in considerable bounds in the case where the top squark decays to a neutralino and a charm quark. However, in the case where the top squark decays to a neutralino, a bottom quark, and two fermions via an off-shell W boson, there is currently a significant unconstrained region in the top-squark-neutralino mass plane, still allowing for top squark masses in the range 90-140 GeV. In this Letter we propose a new monojetlike search for light top squarks, optimized for the four-body decay mode, in which at least one b-tagged jet is required. We show that, by using the existing 8 TeV LHC data set, such a search would cover the entire unconstrained region. Moreover, in the process of validating our tools against an ATLAS monojet search, we show that the existing limit can be extended to exclude also top squark masses below 100 GeV.
authors.affiliation: Department of Fundamental Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden.
authors.forename: Gabriele
authors.initials: G
authors.lastname: Ferretti
authors.affiliation: Theory Division, Physics Department, CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: Roberto
authors.initials: R
authors.lastname: Franceschini
authors.affiliation: Department of Fundamental Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden; Physique Théorique et Mathématique, Université Libre de Bruxelles, C.P. 231, 1050 Brussels, Belgium; and International Solvay Institutes, 1050 Brussels, Belgium.
authors.forename: Christoffer
authors.initials: C
authors.lastname: Petersson
authors.affiliation: Dipartimento di Fisica e Astronomia, Università di Padova, and INFN Sezione di Padova, Via Marzolo 8, I-35131 Padova, Italy.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Torre