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

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http://hdl.handle.net/10138/24093

Lähdeviite

Aaltonen , T , Mehtala , P , Orava , R , Saarikko , H , Osterberg , K & CDF Collaboration 2010 , ' Search for single top quark production in pp̅ collisions at √s=1.96  TeV in the missing transverse energy plus jets topology ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol. 81 , no. 7 , pp. 072003 . https://doi.org/10.1103/PhysRevD.81.072003

Julkaisun nimi: Search for single top quark production in pp̅ collisions at √s=1.96  TeV in the missing transverse energy plus jets topology
Tekijä: Aaltonen, T.; Mehtala, P.; Orava, R.; Saarikko, H.; Osterberg, K.; CDF Collaboration
Muu tekijä: University of Helsinki, Department of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Päiväys: 2010
Kieli: eng
Sivumäärä: 24
Kuuluu julkaisusarjaan: Physical Review D : Particles, Fields, Gravitation and Cosmology
ISSN: 1550-7998
URI: http://hdl.handle.net/10138/24093
Tiivistelmä: We report a search for single top quark production with the CDF II detector using 2.1 fb-1 of integrated luminosity of pbar p collisions at sqrt{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/c2 and ascribing the excess to single top quark production, the cross section is measured to be 4.9+2.5-2.2(stat+syst)pb, consistent with measurements performed in independent datasets and with the standard model prediction.
Avainsanat: 114 Physical sciences
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