Search for Light Resonances Decaying into Pairs of Muons as a Signal of New Physics

TL;DR

This paper reports a search for new light particles decaying into muon pairs using CMS data, setting upper limits on production rates and exploring supersymmetry models with a dark sector.

Contribution

First search for low-mass states decaying into muons with CMS, providing constraints on models with leptonic jets and dark sectors.

Findings

No excess observed over background.

Set upper limits on production cross section times branching fraction.

Interpreted results within supersymmetry dark sector models.

Abstract

A search for groups of collimated muons is performed using a data sample collected by the CMS experiment at the LHC, at a centre-of-mass energy of 7 TeV, and corresponding to an integrated luminosity of 35 inverse picobarns. The analysis searches for production of new low-mass states decaying into pairs of muons and is designed to achieve high sensitivity to a broad range of models predicting leptonic jet signatures. With no excess observed over the background expectation, upper limits on the production cross section times branching fraction times acceptance are set, ranging from 0.1 to 0.5 pb at the 95% CL depending on event topology. In addition, the results are interpreted in several benchmark models in the context of supersymmetry with a new light dark sector exploring previously inaccessible parameter space.