We search for heavy resonances decaying into HH→4b, resulting in a dijet topology. Subjet b-tagging is explored as background discriminator, and feasibility studies in background estimations are done using an ABCD method. We find that 3 and 4 subjet b-tags result in the most efficient categories. Using these categories, we construct a background estimation to be used in further analysis in HH→4b channel
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