NLO tools and the background to H→ WW
Abstract
A theory input is needed for the estimation of the largest background for the H→ WW search at the LHC. This is the shape of the m spectrum from continuum WW production. We find this to depend on how NLO matrix elements are merged with parton showers, and we compare the results from a number of different implementations. The results suggest that both the size of the background estimate and its uncertainty may have been underestimated. This conclusion is reinforced by a "Note Added", which comments on the LHC results released on November 14 2012.
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