Precise studies of the top-quark sector will be performed in theLHC in order to test the standard model and search for new physics. The top-quarksector at the LHC opens a very rich region to look for new phenomena. Searchesbeyond the standard model include new top quark decays and top quarks in resonantproduction. In the latter, a good observable to carry on a model-independent searchis the top pair invariant mass. A special reconstruction procedure is needed for thecase of heavy resonances decaying into very high-p_Ttop jets. CMS is developingtools to improve the reconstruction of these highly boosted top jets and studyingthe discovery potential for new physics in the top quark sector. A brief review ofthese studies is given in this paper.
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