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Título

Search for single top quark production in pp̅ collisions at √s=1.96  TeV in the missing transverse energy plus jets topology

AutorAaltonen, T.; Cabrera, Susana ; Cuenca Almenar, Cristóbal ; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío
Fecha de publicación1-abr-2010
EditorAmerican Physical Society
CitaciónPhysical Review D 81(7): 072003 (2010)
ResumenWe report a search for single top quark production with the CDF II detector using 2: 1 fb(-1) of integrated luminosity of p (p) over bar collisions at root s = 1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W -> tau nu decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations (sigma), with a median expected sensitivity of 1.4 sigma. Assuming a top quark mass of 175 GeV/c(2) and ascribing the excess to single top quark production, the cross section is measured to be 4.9(-2.2)(+2.5) (stat + syst) pb, consistent with measurements performed in independent data sets and with the standard model prediction.
Descripción24 páginas, 15 figuras, 4 tablas.-- PACS numbers: 12.15.Hh, 13.85.Ni, 14.65.Ha.-- CDF Collaboration: et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.81.072003
URIhttp://hdl.handle.net/10261/24441
DOI10.1103/PhysRevD.81.072003
ISSN1550-7998
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