Single-Top Search using a Likelihood Function Technique

3.2fb-1 Single-Top Search Using a Multivariate Likelihood Function Technique

Ji-Eun Jung, Thomas Junk, Sarah Budd, Catalin Ciobanu
Seoul National University, Fermilab , University of Illinois at Urbana-Champaign, University of Paris

Documentation

The technique is described in our analysis public note for the 3.2/fb dataset..

Cross Section Measurment

σ = 1.6_-0.7^+0.8pb (2.864pb "SM" : hep-ph/0207055 B.W.Harris at al. )

Significance using 2 and 3 jet bin t-channel Likelihood Functions

Expected p-value: 2.58e-05 (4.05 σ)
Observed p-value: 0.0090718 (2.36 σ)

Limit for Vtb

95% CL limit on |V_tb| > 0.41

Background Estimate

Systematics

2-jet bin, 1 tag

3-jet bin, 1 tag

3-jet bin, 2 tag

JES systematics

Plots

Plots add all lepton categories together. All model contributions have been scaled to prediction.

t-channel 2 and 3 jet bin Likelihood Functions

2-jet bin

3-jet bin

2 jet bin Likelihood input variables

3 jet bin Likelihood input variables

Contact the authors: ici@fnal.gov, trj@fnal.gov, sbudd@fnal.gov, catutza@fnal.gov