Revisiting experimental mass limits on HECOs using Dyson-Schwinger resummation

TL;DR

This paper introduces a Dyson-Schwinger resummation method to accurately compute HECO production cross sections, leading to improved mass bounds from collider searches beyond previous tree-level estimates.

Contribution

It develops a non-perturbative resummation scheme for HECO production, overcoming perturbative limitations due to large electric charges.

Findings

More reliable mass bounds for HECOs from collider data

Demonstrates the breakdown of perturbative calculations for high-charge particles

Provides a framework for future searches of highly charged objects

Abstract

High-Electric-Charge compact Objects (HECOs) appear in several theoretical particle physics models beyond the Standard Model, and are actively searched for in current colliders, such as the Large Hadron Collider (LHC). In such searches, mass bounds of these objects have been placed, using Drell-Yan and Photon-Fusion processes at tree level so far. However, such estimates are not reliable, given that, as a result of the large values of the electric charge of the HECO, perturbative QED calculations break down. We present a Dyson-Schwinger-like resummation scheme, which allows for a large gauge coupling and thus makes the computation of the pertinent HECO-production cross sections reliable, thus allowing us to extract improved mass bounds for such objects from ATLAS and MoEDAL searches.