Search for heavy narrow dilepton resonances in pp collisions at sqrt(s) = 7 TeV and sqrt(s) = 8 TeV

TL;DR

This paper reports a search for heavy narrow dilepton resonances in proton-proton collisions at 7 and 8 TeV using CMS data, setting new exclusion limits on various theoretical models at 95% confidence level.

Contribution

It provides the most stringent limits to date on heavy narrow dilepton resonances by combining data from 7 and 8 TeV collisions with the CMS detector.

Findings

No evidence for heavy narrow resonances was observed.

Excluded Z' resonances lighter than 2590 GeV at 95% CL.

Excluded Kaluza-Klein gravitons lighter than 2390 GeV at 95% CL.

Abstract

An updated search for heavy narrow resonances decaying to muon or electron pairs using the CMS detector is presented. Data samples from pp collisions at sqrt(s) = 7 TeV and 8 TeV at the LHC, with integrated luminosities of up to 5.3 and 4.1 inverse femtobarns, respectively, are combined. No evidence for a heavy narrow resonance is observed. The analysis of the combined data sets excludes, at 95% confidence level, a Sequential Standard Model Z'[SSM] resonance lighter than 2590 GeV, a superstring-inspired Z'[psi] lighter than 2260 GeV, and Kaluza-Klein gravitons lighter than 2390 (2030) GeV, assuming that the coupling parameter k/M-bar[Pl] is 0.10 (0.05). These are the most stringent limits to date.