Quarkonia: The hidden charm and beauty of Heavy Ion Collisions

Quarkonia states (J/psi and Upsilon) have been one of the richest and the most interesting tools of high energy heavy ion collisions since their suppression was proposed as a signal of quark gluon plasma (QGP). The understanding of these probes has evolved substantially via measurements through three generations of experiments: SPS (at CERN), RHIC (at BNL) and the LHC (at CERN) and by voluminous theoretical activities. This talk summarizes recent results on quarkonia measurements in pp, pPb and PbPb collisions at LHC. The Compact Muon Solenoid (CMS) experiment has excellent muon detection capability which allows measurement of charmonia states at high transverse momentum while all three Upsilon states can be reconstructed starting at zero transverse momentum. The vertexing capability of CMS also enables measurement of B meson energy loss via its decay to J/psi. How these measurements compare with other experiments at RHIC and LHC and have improved the understanding of heavy ion collisions will be discussed. We demonstrate the manifestation of different processes responsible for the modification of quarkonia yields in PbPb collisions.