Combining subjet algorithms to enhance ZH detection at the LHC

Details Combining subjet algorithms to enhance ZH detection at the LHC Combining subjet algorithms to enhance ZH detection at the LHC

2010-05-03

arxiv.org/abs/1005.0417v2

JHEP 1008:029,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages with eight figures; v. 2 with some revisions for clarity to make the arXiv version close to the JHEP version

Scientific paper

10.1007/JHEP08(2010)029

The signal for a highly boosted heavy resonance competing against a background of light parton jets at the LHC can be enhanced by analyzing subjets in the "fat" jet that possibly contains the heavy resonance. Three methods for doing this are known as filtering, pruning, and trimming. We study the possibility of combining these methods using a relative likelihood approach. We find that, because the methods are not the same, one achieves an enhanced statistical power by combining them. We illustrate the possibilities first with a simple problem of combining trimming and pruning to enhance the signal for finding a boosted top quark. We then study the more difficult problem of disentangling from the background the signal for the production of a Higgs boson in association with a Z-boson. For this problem, we combine filtering, trimming, and pruning.

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