Speaker
Dr
Nitish Dhingra
(Panjab University, Chandigrah (India))
Description
A search for heavy resonances decaying into $\tau^{+}\tau^{-}$ has been performed using 4.94 fb$^{-1}$ of proton-proton collision data at 7 TeV recorded by the CMS detector during LHC Run2011. Estimation of major backgrounds has been performed using data-driven methods wherever possible. In the absence of any excess of observed data events over the Standard Model background prediction, an upper limit on the product of the resonance cross-section and branching fraction into $\tau$-lepton pair has been calculated as a function of the resonance mass. Using the Sequential Standard Model resonance $Z'_{SSM}$ and the Superstring inspired E6 Model resonance $Z'_{\psi}$ as benchmarks, resonances with Standard Model couplings with masses below 1.4 and 1.1 TeV, respectively, are excluded at 95% confidence level.
Primary author
Dr
Nitish Dhingra
(Panjab University, Chandigrah (India))