# Measurement of the tt̅ production cross section in 2  fb-1 of pp̅ collisions at √s=1.96  TeV using lepton plus jets events with soft muon b tagging

http://hdl.handle.net/10138/24458

#### Citation

Aaltonen , T , Mehtälä , P , Orava , R , Mäki , T , Saarikko , H , Österberg , K & CDF collaboration 2009 , ' Measurement of the tt̅ production cross section in 2  fb-1 of pp̅ collisions at √s=1.96  TeV using lepton plus jets events with soft muon b tagging ' , Physical Review D : Particles, Fields, Gravitation and Cosmology , vol 79 , no. 5 , pp. 052007 .

 Title: Measurement of the tt̅ production cross section in 2  fb-1 of pp̅ collisions at √s=1.96  TeV using lepton plus jets events with soft muon b tagging Author: Aaltonen, Timo; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth; CDF collaboration Contributor: University of Helsinki, Department of PhysicsUniversity of Helsinki, Helsinki Institute of PhysicsUniversity of Helsinki, Department of PhysicsUniversity of Helsinki, Helsinki Institute of Physics (HIP) (-2009)University of Helsinki, Department of PhysicsUniversity of Helsinki, Department of Physics Belongs to series: Physical Review D : Particles, Fields, Gravitation and Cosmology ISSN: 1550-7998 Abstract: We present a measurement of the tt̅ production cross section in pp̅ collisions at √s=1.96  TeV using events containing a high transverse momentum electron or muon, three or more jets, and missing transverse energy. Events consistent with tt̅ decay are found by identifying jets containing candidate heavy-flavor semileptonic decays to muons. The measurement uses a CDF run II data sample corresponding to 2  fb-1 of integrated luminosity. Based on 248 candidate events with three or more jets and an expected background of 79.5±5.3 events, we measure a production cross section of 9.1±1.6  pb.We present a measurement of the $\ttbar$ production cross section in $\ppbar$ collisions at $\sqrt{s}=1.96$ TeV using events containing a high transverse momentum electron or muon, three or more jets, and missing transverse energy. Events consistent with $\ttbar$ decay are found by identifying jets containing candidate heavy-flavor semileptonic decays to muons. The measurement uses a CDF Run II data sample corresponding to $2 \mathrm{fb^{-1}}$ of integrated luminosity. Based on 248 candidate events with three or more jets and an expected background of $79.5\pm5.3$ events, we measure a production cross section of $9.1\pm 1.6 \mathrm{pb}$. Peer review status: Peer reviewed URI: http://hdl.handle.net/10138/24458 Date: 2009 Subject: 114 Physical sciences hep-ex
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