During 2010, the CMS experiment at the Large Hadron Collider collected
a total integrated luminosity of 36 pb-1 at a center-of-mass energy of
7 TeV. With this initial data set, precise measurements of the
standard model at the new ener gy regime have been performed, for
example the measurement of the W and Z cross sections, and more
recently the top pair production cross section. Now, CMS is engaging
in the search for new physics beyond the standard model. The top quark
sector is sensitive to new interactions due to the strong Yukawa
coupling. For example, new massive particles can be produced which
decay to a pair to top quarks. I will describe briefly the measurement
of the top pair cross section in lepton+jets events, and in more
detail the search for heavy top pair resonances in CMS.
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