# Beyond the Standard Model

## Mariano Quirós

## There are a number of reasons, both theoretical (hierarchy problem, strong CP problem, flavor problem, the origin of matter-antimatter asymmetry,…) and experimental (Dark Matter…) why we believe that the Standard Model of strong and electroweak interactions cannot be the ultimate theory of particle interactions. This has motivated the development of theories beyond the Standard Model (BSM), which is the main task of the BSM subgroup of the IFAE Theory Group, and the experimental search of BSM physics, which in particular is being undertaken at the LHC.

## Introduction

## Instability of the Higgs potential in the Standard Model

## RD(∗) in custodial warped space

## Collider phenomenology, BSM and cosmology

G. Panico has been working on different topics connected to collider phenomenology, beyond the Standard Model physics and cosmology. He followed three main research directions. One of them, in collaboration with L. Di luzio and R. GrÂber, was focussed on the exploitation of precision measurements to set bounds on the presence of new heavy multiplets with electroweak quantum numbers. In particular he assess the sensitivity to these states via the modification of neutral and charged Drell-Yan processes at the high-luminosity phase of the LHC and at future lepton and hadron colliders.

A second research line, in collaboration with A. Pomarol and M. Riembau, was devoted to the study of new-physics corrections to the electron electric dipole moment (EDM). He performed an analysis of the leading contributions up to two-loop order within an effective field theory framework. The relevance of this work is related to the new, recently released ACME bounds that improve the constraint on the electron EDM by nearly one order of magnitude. The new bounds allow to test a significant fraction of the parameter space of theories in which the electron EDM is generated only at two-loop level, which were instead not testable with the previous experimental constraints.

The third research line, done in collaboration with F. Ferrer, E. Masso, O. Pujolas and F. Rompineve, was focussed on the study of a new formation mechanism for primordial black holes. The new mechanism relies on the collapse of long-lived string-domain wall networks and is naturally realized in QCD axion models with domain wall number larger than one and Peccei-Quinn symmetry broken after inflation. A nice feature of this mechanism is its independence from cosmological inflation.