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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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

Title: Search for single top quark production in pp̅ collisions at √s=1.96  TeV in the missing transverse energy plus jets topology
Alternative title: Search for single top quark production in pbar p collisions at sqrt{s}=1.96 TeV in the missing transverse energy plus jets topology
Author: Aaltonen, T.; Mehtala, P.; Orava, R.; Saarikko, H.; Osterberg, K.; CDF Collaboration
Contributor organization: Department of Physics
Helsinki Institute of Physics
Date: 2010
Language: eng
Number of pages: 24
Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology
ISSN: 1550-7998
DOI: https://doi.org/10.1103/PhysRevD.81.072003
URI: http://hdl.handle.net/10138/24093
Abstract: 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.We report a search for single top quark production with the CDF II detector using 2.1  fb-1 of integrated luminosity of pp̅ collisions at √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→τν 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 (σ), with a median expected sensitivity of 1.4σ. 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 4.9-2.2+2.5(stat+syst)  pb, consistent with measurements performed in independent data sets and with the standard model prediction.
Description: submitted to Phys. Rev. D
Subject: 114 Physical sciences
Peer reviewed: Yes
Usage restriction: restrictedAccess


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