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Theoretical physicists working at a blackboard collaboration pod in the Beecroft building.
Credit: Jack Hobhouse

Dr Stephen West

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Research theme

  • Particle astrophysics & cosmology
  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
stephen.west@physics.ox.ac.uk
Rudolf Peierls Centre for Theoretical Physics, room 70.13
  • About
  • Publications

Heavy Dark Matter Through the Higgs Portal

ArXiv 0801.3440 (2008)

Authors:

John March-Russell, Stephen M West, Daniel Cumberbatch, Dan Hooper

Abstract:

Motivated by Higgs Portal and Hidden Valley models, heavy particle dark matter that communicates with the supersymmetric Standard Model via pure Higgs sector interactions is considered. We show that a thermal relic abundance consistent with the measured density of dark matter is possible for masses up to $\sim 30\tev$. For dark matter masses above $\sim 1\tev$, non-perturbative Sommerfeld corrections to the annihilation rate are large, and have the potential to greatly affect indirect detection signals. For large dark matter masses, the Higgs-dark-matter-sector couplings are large and we show how such models may be given a UV completion within the context of so-called "Fat-Higgs" models. Higgs Portal dark matter provides an example of an attractive alternative to conventional MSSM neutralino dark matter that may evade discovery at the LHC, while still being within the reach of current and upcoming indirect detection experiments.
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Anomaly Holography

Nuclear Physics B (2007)

Authors:

SM West, B Gripaios
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Nonperturbative flat direction decay

Physical Review D 76 (2007) 065005 8pp

Authors:

SM West, A Basboll, D Maybury, F Riva
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Improved higgs naturalness with supersymmetry

AIP CONF PROC 903 (2007) 439-442

Authors:

B Gripaios, SM West

Abstract:

We present a supersymmetric model of electroweak symmetry-breaking exhibiting improved naturalness, wherein the stop mass can be pushed beyond the reach of the Large Hadron Collider without unnatural fine tuning. This implies that supersymmetry may still solve the hierarchy problem, even if it eludes detection at the LHC.
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Mixed sneutrino dark matter and the ratio Omega(b)/Omega(dm center dot)

AIP CONF PROC 903 (2007) 567-570

Abstract:

It is known that the cosmological baryon density (Omega(b)) and dark matter density (Q(dm)) have strikingly similar values. However, in most theories of the early Universe, each density is explained by separate dynamics and consequently there is no compelling reason for this observation. In this note, I briefly review a model in which the dark matter species possesses a particle-antiparticle asymmetry. This asymmetry determines both the baryon asymmetry and strongly affects the dark matter density, thus naturally linking Omega(b) and Omega(dm). In these models it is shown that sneutrinos can play the role of such dark matter
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