Eur. Phys. J. C (2013) 73: 2643
https://doi.org/10.1140/epjc/s10052-013-2643-z

Regular Article - Theoretical Physics

Multiple Higgs-portal and gauge-kinetic mixings

¹ Department of Physics, Chonbuk National University, Jeonju, 561-756, Republic of Korea
² SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
³ Theory Group, Deutsches Elektronen-Synchrotron DESY, 22603, Hamburg, Germany

^* e-mail: christoph.englert@glasgow.ac.uk

Received: 10 September 2013
Revised: 10 October 2013
Published online: 26 November 2013

Abstract

We develop a phenomenological formalism for mixing effects between the Standard Model and hidden-sector fields, motivated by dark matter in the Universe as well as string theories. The scheme includes multiple Higgs-portal interactions in the scalar sector as well as multiple gauge-kinetic mixings in the abelian gauge sector. While some of the mixing effects can be cast in closed form, other elements can be controlled analytically only by means of perturbative expansions in the ratio of standard scales over large hidden scales. Higgs and vector-boson masses and mixings are illustrated numerically for characteristic processes.