Inclusive Search for Same-Sign Dileptons at ATLAS

TL;DR

This paper reports on an inclusive search for same-sign dileptons at ATLAS, analyzing early 2010 data with no Standard Model disagreement found, and sets limits on new physics models, with ongoing updates expected to enhance sensitivity.

Contribution

It introduces an improved analysis with new selection criteria and more data, enhancing the search for non-Standard Model same-sign dilepton production at ATLAS.

Findings

No deviation from Standard Model observed in 2010 data.

Set limits on cross sections for new physics models.

Ongoing analysis with larger dataset aims to improve sensitivity.

Abstract

An inclusive search for the non-Standard Model production of two isolated leptons of the same electrical charge is presented. The search was performed with 2010 collision data in the ATLAS detector at the Large Hadron Collider for ee, e{\mu}, and {\mu}{\mu} channels. With 34 pb-1 of integrated luminosity, no disagreement with the Standard Model prediction was found, and limits on the fiducial cross section for generic same-sign production as well as four model-dependent limits for models of new physics were set. An updated same sign analysis with 1.6 fb-1 is underway and nearly complete for the {\mu}{\mu} channel. With new event selection criteria, improved data-driven background estimates, and significantly more collision data, the sensitivity is expected to improve significantly beyond that of the analysis completed with data from 2010. Initial results from the updated analysis are presented.