Type of Document	Dissertation
Author	Sumowidagdo, Suharyo
URN	etd-12112007-131759
Title	First Measurement of top quark pair production cross-section in muon plus hadronic tau final states
Degree	Doctor of Philosophy
Department	Physics, Department of
Advisory Committee	Advisor Name Title Todd Adams Committee Chair Ettore Aldrovandi Committee Member Horst Wahl Committee Member Laura Reina Committee Member Simon Capstick Committee Member
Keywords	cross-section D0 Tevatron Fermilab tau lepton top quark
Date of Defense	2007-11-26
Availability	unrestricted
Abstract This dissertation presents the first measurement of top quark pair production cross-section in events containing a muon and a tau lepton. The measurement was done with 1 inverse femtobarn of data collected during April 2002 through February 2006 using the D0 detector at the Tevatron proton-antiproton collider, located at Fermi National Accelerator Laboratory (Fermilab), Batavia, Illinois. Events containing one isolated muon, one tau which decays hadronically, missing transverse energy, and two or more jets (at least one of which must be tagged as a heavy flavor jet) were selected. Twenty-nine candidate events were observed with an expected background of 9.16 events. The top quark pair production cross-section is measured to be sigma(ttbar) = 8.0 +2.8 -2.4 (stat) +1.8 - 1.7(syst) +/- 0.5 (lumi) pb. Assuming a top quark pair production cross-section of 6.77 pb for Monte Carlo signal top events without a real tau, the measured sigma (ttbar)xBR(ttbar -> muon + tau + 2neutrino + 2b) sigma(ttbar)x BR(ttbar -> muon + tau + 2neutrino + 2b) = 0.18 +0.13 - 0.11 (stat) +0.09 -0.09 (syst) +/- 0.01 (lumi) pb.
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