Date of this Version
Physics Letters B 708 (2012) 296–299
A method of top tagging is introduced. Using the anti-kt algorithm to define jets, events with nj = 2 fat jets of cone size R = 1.5 are decomposed into R = 0.6 subjets and retained if nj (R = 0.6) [?] 4. One pair of subjets reconstructs the W mass and another two subjets are tagged as a b-jet, as necessary for hadronic or semileptonic events of tt origin. This “hollow cone” method distinguishes the tt events from the light parton QCD dijet events. Our simulations are made for the LHC at 7 TeV. The sieve allows for top identification at lower pT than other proposed methods and thus allows a higher signal retention.