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Title

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

AuthorsAaltonen, 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
KeywordsScalar Top
Electromagnetic Calorimeter
Hadron Colliders
Standard Model
Decays
Issue Date25-Oct-2007
PublisherAmerican Physical Society
CitationPhysical Review D 76(7): 072010 (2007)
AbstractWe 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.
Description12 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
URIhttp://hdl.handle.net/10261/8521
DOI10.1103/PhysRevD.76.072010
ISSN1550-7998
Appears in Collections:(IFCA) Artículos
(IFIC) Artículos
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