WIMP Dark Matter through the Dilaton Portal

• Main Authors: Blum, Kfir, Cliche, Mathieu, Csaki, Csaba, Lee, Seung J
• Format: Journal Article
• Language: English
• Published: 07.10.2014
• Subjects: Physics - Cosmology and Nongalactic Astrophysics; Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.1410.1873

We study a model in which dark matter couples to the Standard Model through a dilaton of a sector with spontaneously broken approximate scale invariance. Scale invariance fixes the dilaton couplings to the Standard Model and dark matter fields, leaving three main free parameters: the symmetry breaking scale $f$, the dilaton mass $m_{\sigma}$, and the dark matter mass $m_{\chi}$. We analyze the experimental constraints on the parameter space from collider, direct and indirect detection experiments including the effect of Sommerfeld enhancement, and show that dilaton exchange provides a consistent, calculable framework for cold dark matter with $f,\,m_\sigma,\,m_\chi$ of roughly similar magnitude and in the range $\sim 1-10$ TeV. Direct and indirect detection experiments, notably future ground-based gamma ray and space-based cosmic ray measurements, can probe the model all the way to dark matter mass in the multi-TeV regime.