Single-Top Search using a Likelihood Function Technique

955/pb Single-Top Search Using a Multivariate Likelihood Function Technique

Sarah Budd, Catalin Ciobanu, Thomas Junk, Michael Wren
University of Illinois at Urbana-Champaign

Documentation

The technique is described in our previous analysis public note for the 0.7/fb dataset.. An updated version of this note containing the results below is coming soon.

s+t signal limits calculated using a background only (no single-top) null hypothesis

95% C.L. limit on single top s+t cross section, using the 2D discriminant: t-chan LF vs s-chan LF
Observed: 2.7 pb
Expected: 2.9 pb

Fit to Data Results

Best chisquare fit:
t-channel: 0.2 -0.2+0.9 pb
s-channel: 0.1 -0.1+0.7 pb

s+t Combined Signal Limit Table

Limit Type	Expected 2-D (default)	Observed 2-D (default)	Expected 1-D (*)	Observed 1-D(*)
95% C.L. limit	2.9 pb	2.7 pb	2.9 pb	2.9 pb
p-value (1-CLb)	2.5%	58.5%	2.3%	51.1%
(*) 1-D results computed using only the t-channel LF as discriminant, given for comparison.