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In the top quark pair production in association with the Higgs boson decayingto a b quark pair t-tbar H (b-bbar), the final state has an irreduciblenonresonant background from the production of a top quark pair in associationwith a b quark pair t-tbar b-bbar. Therefore, understanding of the t-tbarb-bbar process precisely in particular differential cross-section as functionsof the properties of the additional b jets not from the top quark decay isessential for improving the sensitivity of a search for the t-tbar H b-bbarprocess. The two additional b jets can be identified by using variousapproaches. In this paper, the performances are compared quantitatively in thelepton+jets decay channel in terms of the matching efficiency of assigning twoadditional b jets as a figure of merit. This study provides valuableinformation towards the precise measurement of differential cross-sections as afunction of properties of the additional b jets in the t-tbar b-bbar events. Weshowed that a matching efficiency of around 40% could be achieved using a deepneural network method. In the events with at least 4 b jets, this performanceis 8% better than that achieved using minimum Delta R(b,bbar) method. This isconsistent with the boosted decision tree method within its statisticaluncertainty.

Identification of additional jets in the t-tbar b-bbar events using a deep neural network