Long Dead Winos

TL;DR

This paper introduces a new particle-level simulation approach for CMS disappearing track searches, enabling more accurate recasting of data to set limits on winos and similar particles with various decay lengths.

Contribution

It presents a novel detector-geometry-based simulation method that includes pileup effects, improving the recasting accuracy of disappearing track searches.

Findings

Placed limits on winos with decay lengths above a centimetre.

Extended analysis to a charged scalar model decaying to electrons and invisible fermions.

Validated simulation against CMS acceptances and cutflows.

Abstract

We describe a new code and approach using particle-level information to recast the recent CMS disappearing track searches including all run 2 data. Notably, the simulation relies on knowledge of the detector geometry, and we also include the simulation of pileup events directly rather than as an efficiency function. We validate it against provided acceptances and cutflows, and use it in combination with heavy stable charged particle searches to place limits on winos with any proper decay length above a centimetre. We also provide limits for a simple model of a charged scalar that is only produced in pairs, that decays to electrons plus an invisible fermion.