On July 4, 2012  physicists of the Compact Muon Solenoid (CMS) experiment at the Large Hadron  Collider (LHC) at CERN announced to the world  preliminary results on observation of an excess of events at a mass of  125 GeV with a statistical significance of five standard deviations (5σ) above background expectations. The probability that the background fluctuation alone may create this excess is roughly one in three million. The evidence is strongest in the two final states with the best mass resolution: (a) the two-photon final state, and (b) the final state with two pairs of charged leptons (electrons or muons). One can interpret the above to be due to the production of a previously unobserved particle with a mass of around 125 GeV. More data subsequently reinforced the observation of the new particle. Results obtained in the various search channels are consistent with the expectations for the Standard Model (SM) Higgs boson, within the statistical and systematic uncertainties. However, yet more data will be needed to establish whether the newly observed particle indeed has all the properties of the SM Higgs boson failing which we shall get hints of new physics beyond the Standard Model. The High Energy Nuclear & Particle Physics division of SINP, which is a member of the CMS collaboration, contributed in several ways towards the discovery.  (Read the official statement of CMS at http://cms.web.cern.ch/news/observation-new-particle-mass-125-gev).