Phenomenology 2023 Symposium

Session

BSM IV

8 May 2023, 16:30

Lawrence Hall 104

Conveners

BSM IV

• Xerxes Tata (University of Hawaii)

62. Vectorlike Fermions as Portals into Higgs Vacuum Stability

Tom Steudtner

08/05/2023, 16:30

BSM

This talk addresses the notorious metastability of the Standard Model and promotes it to a model building task. We explore the ingredients required to stabilize the SM up to the Planck scale without encountering sub-Planckian Landau poles. Using the SM extended by vectorlike fermions, we chart out the corresponding landscape of Higgs stability. We find that the "gauge portal mechanism",...

40. Cosmological gravitational particle production of massive spin-2 particles

Siyang Ling

08/05/2023, 16:45

BSM

The phenomenon of cosmological gravitational particle production (CGPP) is expected to occur during the period of inflation and the transition into a hot big bang cosmology. Particles may be produced even if they only couple directly to gravity, and so CGPP provides a natural explanation for the origin of dark matter. In this work we study the gravitational production of massive spin-2...

88. Anomaly Mediated Supersymmetry Breaking for Chiral Gauge Theories

Bethany Suter (UC Berkeley)

08/05/2023, 17:00

BSM

Anomaly Mediated Supersymmetry Breaking or AMSB is a promising new technique that allows one to use the solvability of SUSY chiral theories and translate that in a standard way into non-SUSY theories. I will discuss how this new method works and apply it to a certain set of chiral gauge theories with fields in the fundamental, antifundamental and antisymmetric representations. I find that this...

86. FIMP Dark matter from Flavor models

Shreyashi Chakdar

08/05/2023, 17:15

BSM

We investigate the phenomenology of a non-thermal dark matter (DM) in the context of flavor models that explain the hierarchy in the masses and mixings of quarks and leptons via the Froggatt-Nielsen (FN) mechanism. A flavor-dependent $U(1)_{FN}$ symmetry explains the fermion mass and mixing hierarchy, and also provides a mechanism for suppressed interactions of the DM, assumed to be a Majorana...

92. New Horizons in the Holographic Phase Transition

Bharath Sambasivam

08/05/2023, 17:30

BSM

We consider dynamical fully 5-Dimensional cosmological solutions of the holographic dilaton to study an out-of-equilibrium alternative to the thermal Randall-Sundrum conformal phase transition. It is well known that this transition is typically strongly first order, with the requirement of a perturbative 5D gravity theory obstructing completion of the transition. We comment on a class of...

89. Mass-varying gauge boson that couples to the dark energy field

Jaeok Yi

08/05/2023, 17:45

We study the dark gauge boson in the gauged quintessence model. The gauged quintessence is the dark energy field under a gauge symmetry, and therefore its mass varies as the quintessence scalar value changes. The change of the dark gauge boson mass brings interesting consequences. The evolution of the universe is sensitively affected by the mass-varying dark gauge boson. We study various...

179. What Can Generalized Symmetries Do For You

Seth Koren

08/05/2023, 18:00

BSM

Models of particle physics that you care about have generalized symmetries, and understanding them can lead to new insights into these theories. I'll give a brief overview of the sorts of questions one might try to address with this technology.

150. Vector boson dark matter in a classically conformal U(1) extension of the Standard Model

Victor Baules

08/05/2023, 18:15

BSM

We consider a classically conformal $U(1)$ extension of the Standard Model (SM). The $U(1)$ symmetry is radiatively broken by the Coleman-Weinberg mechanism, after which the $U(1)$ Higgs field $\phi$ drives electroweak symmetry breaking through a mixed quartic coupling with the SM Higgs doublet with coupling constant λmix. The conformal system features a suppressed coupling $g_{h_{1} h_{2}...

63. EFT for Heavy Dark Matter of Arbitrary Spin

Dr Sandra Kvedaraite

08/05/2023, 18:30

BSM

We construct an effective field theory for non-relativistic heavy dark matter of arbitrary spin based on the Little group formalism. We present the most general HDMEFT basis up to dimension seven involving scalar (spin 0), vector (integer spin) and fermionic (half-integer spin) dark matter fields. We also discuss the matching onto the non-relativistic EFT.