Conveners
BSM I
- Lisa Everett
The existence of a magnetic monopole, if it exists, remains elusive. Experimental searches have been carried out and are continuing in this quest. Of great uncertainty is the mass of the monopole which is model-dependent and ranging from some Grand Unified scale to the electroweak scale. In this paper, we propose a model where topologically stable, finite-energy monopoles {\em `{a} la} 't...
While non-linear realizations of continuous symmetries feature derivative interactions and have no potential, non-linear realizations of discrete symmetries feature non-derivative interactions and have a highly suppressed potential. These pseudo-Goldstone bosons have a non-zero potential, but the potential generated from quantum corrections is inherently very highly suppressed. We explore...
We investigate extensions of the Twin Higgs model in which the twin color gauge symmetry and the Z2 mirror symmetry are spontaneously broken, by introducing a single new colored triplet, sextet, or octet scalar field and its twin along with a suitable scalar potential. This spontaneous Z2 breaking allows for a viable electroweak vacuum, and leads to dramatic differences between the visible and...
We propose a new mechanism for generating matter-antimatter asymmetry via the interference of tree-level diagrams only. We first derive a general result that a nonzero $CP$-asymmetry can be generated via at least two sets of interfering tree-level diagrams involving either $2\rightarrow2$ or $1\rightarrow {\cal N}$ (with ${\cal N}\geq3$) processes. We illustrate this point in a simple ...
A common assumption about the early universe is that it underwent an electroweak phase transition (EWPT). Though the standard model (SM) is able to restore the electroweak symmetry through a smooth cross over PT, we require a strongly first-order PT to ensure electroweak baryogenesis, requiring us to look at new physics beyond the SM. The simplest case to extend the SM is to add a real singlet...
We present a minimal model of fermionic dark matter (DM), where a singlet Dirac fermion can interact with the Standard Model (SM) particles via the torsion field of gravitational origin. In general, torsion can be realized as an antisymmetric part of the affine connection associated with the spacetime diffeomorphism symmetry and thus can be thought of as a massive axial vector field. Because...
The Galactic Center gamma-ray Excess (GCE) is one of the most statistically significant experimental anomalies to date, with one possible explanation in annihilating dark matter. In this talk we discuss a realization of a Higgs portal thermal relic, such as preferred by the GCE, with a CP-violating Yukawa coupling. The phase of this coupling sets the hierarchy between annihilation and...
