Search for new Resonances in Dielectron and Dimuon Mass Spectra at $\sqrt{s} = \text{8 TeV}$ with CMS

A search for new massive resonances decaying to a dielectron or a dimuon pair is presented. The search uses the full dataset corresponding to an integrated luminosity of about $20\mbox{ fb}^{-1}$ of pp collisions at a center-of-mass energy of $8\mbox{ TeV}$, collected by the CMS experiment in 2012. In absence of a significant deviation from the standard model predictions, 95\% confidence level limits are set on the ratio of cross section times branching ratio of a new resonance to the cross section times branching ratio of the Z boson. A sequential standard model $Z_{SSM}$ and a superstring-inspired $Z_{\psi}$ of mass lighter than $2960\mbox{ GeV}$ and $2600\mbox{ GeV}$, respectively, can be excluded at 95\% confidence level.