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2016

Improved jet substructure methods: Y-splitter and variants with grooming

Dasgupta, Mrinal, Powling, Alexander, Schunk, Lais et al.

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It has recently been demonstrated with Monte Carlo studies that combining the well-known Y-splitter and trimming techniques gives rise to important gains in the signal significance achievable for boosted electroweak boson tagging at high $p_t$.

Here we carry out analytical calculations that explain these findings from first principles of QCD both for grooming via trimming and via the modified mass-drop tagger (mMDT).
We also suggest modifications to Y-splitter itself, which result in great simplifications to the analytical results both for pure Y-splitter as well as its combination with general grooming methods.
The modifications also lead to further performance gains, while making the results largely independent of choice of groomer.

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