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Open Access item Searches for direct pair production of supersymmetric top and supersymmetric bottom quarks in pp̅ collisions at √s=1.96  TeV

Authors:Aaltonen, T.
Vila, Iván
Vilar, Rocío
Rodrigo, Teresa
Cabrera, Susana
Chuang, S. H.
Ruiz Jimeno, Alberto
Gómez, G.
Cuenca Almenar, Cristóbal
Cuevas, Javier
Palencia, Enrique
Casal, Bruno
Piedra, Jonatan
Scodellaro, Luca
Keywords:Scalar Top, Electromagnetic Calorimeter, Hadron Colliders, Standard Model, Decays
Issue Date:25-Oct-2007
Publisher:American Physical Society
Citation:Physical Review D 76(7): 072010 (2007)
Abstract:We search for direct pair production of supersymmetric top quarks and supersymmetric bottom quarks in proton-antiproton collisions at root s=1.96 TeV, using 295 pb(-1) of data recorded by the Collider Detector at Fermilab (CDF II) experiment. The supersymmetric top (supersymmetric bottom) quarks are selected by reconstructing their decay into a charm (bottom) quark and a neutralino, which is assumed to be the lightest supersymmetric particle. The signature of such processes is two energetic heavy-flavor jets and missing transverse energy. The number of events that pass our selection for each search process is consistent with the expected standard model background. By comparing our results to the theoretical production cross sections of the supersymmetric top and supersymmetric bottom quarks in the minimal supersymmetric standard model, we exclude, at a 95% confidence level in the frame of that model, a supersymmetric top quark mass up to 132 GeV/c^2 for a neutralino mass of 48 GeV/c^2, and a supersymmetric bottom quark mass up to 193 GeV/c^2 for a neutralino mass of 40 GeV/c^2.
Description:12 páginas, 5 figuras, 4 tablas.-- PACS nrs.: 12.60.Jv, 13.85.Rm, 14.80.Ly.-- CDF Collaboration: et al.
Publisher version (URL):http://dx.doi.org/10.1103/PhysRevD.76.072010
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