Chris Hays

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How effectively can groups of people make yes-or-no decisions? To answer this question, we used signal-detection theory to model the behavior of groups of human participants in a visual detection task. The detection model specifies how performance depends on the group's size, the competence of the members, the correlation among members' judgments, the(More)
This note presents studies of the sensitivity of the ATLAS experiment to Standard Model diboson (W + W − , W ± Z, ZZ, W ± γ, and Zγ) production in pp collisions at √ s = 14 TeV, using final states containing electrons, muons and photons. The studies use the ATLAS Computer System Commissioning (CSC) Monte Carlo datasets, which include trigger information and(More)
We first study cosmetic crossing changes and cosmetic generalized crossing changes in knots of genus one, satellite knots, and knots obtained via twisting operations on standardly embedded tori in the knot complement. As a result, we find obstructions to the existence of cosmetic generalized crossing changes in several large families of knots. We then study(More)
We prove two results about mutation invariance of link homology theories: We show that Khovanov's universal sl(2) homology is invariant under mutation and that the reduced sl(n) homology defined by Khovanov and Rozansky is invariant under component-preserving positive mutation when n is odd. We also give a relationship between the Khovanov homology of a(More)
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