Speaker
Description
Magnetic Monopoles (MM) and high-electric-charge objects (HECOs) are highly ionising particles actively searched for at the LHC. Unfortunately, due to their large couplings, tree-level cross sections, and the resulting mass limits, are in principle unreliable.
We present analytical results from loop resummation techniques à la Dyson and Schwinger in strongly coupled gauge theories in the cases of (structureless) MMs and HECOs. The resummed effective theories are characterised by appropriate non-trivial ultraviolet (UV) fixed points, thus defining the theory to be used in experimental searches.
For spin-1/2 monopoles, we employ a U(1)xU(1) effective field theory with a dual strongly-coupled dark photon. For spin-1/2 and spin-0 HECOs, we work within strongly coupled QED, where scalar HECOs require sufficiently strong self-interactions to stabilise the non-perturbative UV fixed point.
This scheme provides theoretically reliable production cross sections, enabling robust mass bounds for MMs and significantly improved constraints for HECOs from ATLAS and MoEDAL searches compared to tree-level estimates. In the MM resummed case, we reproduce exactly the tree-level processes used in collider searches, therefore justifying the obtained mass bounds.
-
J Alexandre, N E Mavromatos, V A Mitsou and E Musumeci, "Resummation schemes for High-Electric-Charge Objects leading to improved experimental mass limits,"
PRD 109 (2024) 036026 [DOI: 10.1103/PhysRevD.109.036026]
-
J Alexandre, N E Mavromatos, V A Mitsou and E Musumeci, "Impact of resummation on the production and experimental bounds of scalar high-electric-charge objects,"
PRD 111 (2025) 076010 [DOI: 10.1103/PhysRevD.111.076010] -
J Alexandre, N E Mavromatos, V A Mitsou and E Musumeci, "Magnetic-monopole resummation justifies perturbatively calculated collider production cross sections," arXiv:2603.24200 [hep-ph]
| Submitted on behalf of ... | Private submission |
|---|