Probing Dark-ALP Portals at Future $e^+e^-$ Colliders
Abstract
We study portal interactions connecting visible and dark sectors, and involving local interactions of a photon, a dark photon and a axion-like particle (ALP) at future colliders. These interactions, mediated by higher-dimensional effective operators, may arise at one-loop by kinetic mixing between dark and ordinary photons, or, for massless dark photons, by direct short-distance contributions. We explore these portal interactions for a heavy ALP with masses between about 10 GeV and 230 GeV by investigating the sensitivity of the production to the effective couplings, where the dark photon gives rise to missing momentum in the final state. We will show how an appropriate choice of missing-energy and missing-mass cuts can optimize the signal to standard-model background ratio. Exclusion regions for the effective photon-dark-photon-ALP couplings versus the ALP mass are worked out for a few representative values of the collision energy and integrated luminosity, as presently envisaged by future projects.
Cite
@article{arxiv.1906.10608,
title = {Probing Dark-ALP Portals at Future $e^+e^-$ Colliders},
author = {Sanjoy Biswas and Anirban Chatterjee and Emidio Gabrielli and Barbara Mele},
journal= {arXiv preprint arXiv:1906.10608},
year = {2020}
}
Comments
14 pages, 13 figures, 4 tables; LEP bound included, references added