Particle Physics on the Plains​ 2019

Session

Phase Transitions/Models

12 Oct 2019, 09:00

2048 Mallot Hall (University of Kansas)

Conveners

Phase Transitions/Models

• Kuver Sinha (University of Oklahoma)

13. Strong First-Order Electroweak Phase Transitions in the Standard Model with a Singlet Extension

Anthony Hooper (University of Nebraska-Lincoln)

12/10/2019, 09:00

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...

1. Collider and Gravitational Wave Complementarity in Exploring the Singlet Extension of the Standard Model

Dan Vagie

12/10/2019, 09:20

We present a dedicated complementarity study of gravitational wave and collider measurements of the simplest extension of the Higgs sector: the singlet scalar augmented Standard Model. We study the following issues: (i) the electroweak phase transition patterns admitted by the model, and the proportion of parameter space for each pattern; (ii) the regions of parameter space that give...

17. Electroweak Symmetry Non-restoration in Models with New Fermions

Yu Hang Ng (University of Nebraska-Lincoln)

12/10/2019, 09:40

In this talk, I am going to explore the possibility that electroweak phase transition may never occur in the early universe. It is known that the symmetries of some scalar models are not restored at high temperature, or some symmetries that are unbroken at low temperature becomes broken at higher temperature. These phenomena are known as Symmetry Non-restoration (SNR) and Inverse Symmetry...

6. Naturalness versus stringy naturalness (with implications for collider and dark matter searches)

Shadman Salam

12/10/2019, 10:00

The notion of stringy naturalness– that an observable O2 is more natural than O1 if
more (phenomenologically acceptable) vacua solutions lead to O2 rather than O1– is
examined within the context of the Standard Model (SM) and various SUSY extensions:
CMSSM/mSUGRA, high-scale SUSY and radiatively-driven natural SUSY (RNS). Rather
general arguments from string theory suggest a (possibly...

18. Anomaly mediated SUSY breaking model retrofitted for naturalness

Dibyashree Sengupta (University of Oklahoma)

12/10/2019, 10:20

Anomaly-mediated supersymmetry breaking (AMSB) models seem to have become increasingly implausible due to 1. difficulty in generating a Higgs mass $m_h$ $\sim$ 125 GeV, 2. typically unnatural superparticle spectra characterized by a large superpotential mu term and 3. the possibility of a wino-like lightest SUSY particle (LSP) as dark matter now seems to be excluded. In...