477 citations · 1.1k across the 36 of their papers we have counts for
16 papers · 1 filter
Whac-a-constraint with anomaly-free dark matter models
Sonia El Hedri, Karl Nordström
Theories where a fermionic dark matter candidate interacts with the Standard Model through a vector mediator are often studied using minimal models, which are not necessarily anoma…
Charged Higgs Signals in Searches
Daniele S. M. Alves, Sonia El Hedri, Anna Maria Taki +1
New scalars from an extended Higgs sector could have weak scale masses and still have escaped detection. In a Type I Two Higgs Doublet Model, for instance, even the charged Higgs c…
Simplified Phenomenology for Colored Dark Sectors
Sonia El Hedri, Anna Kaminska, Maikel de Vries +1
We perform a general study of the relic density and LHC constraints on simplified models where the dark matter coannihilates with a strongly interacting particle X. In these models…
A Sommerfeld Toolbox for Colored Dark Sectors
Sonia El Hedri, Anna Kaminska, Maikel de Vries
We present analytical formulae for the Sommerfeld corrections to the annihilation of massive colored particles into quarks and gluons through the strong interaction. These correcti…
Hunting for Dark Matter Coannihilation by Mixing Dijet Resonances and Missing Transverse Energy
Malte Buschmann, Sonia El Hedri, Anna Kaminska +5
Simplified models of the dark matter (co)annihilation mechanism predict striking new collider signatures untested by current searches. These models, which were codified in the coan…
Dissecting Jets and Missing Energy Searches Using -body Extended Simplified Models
Timothy Cohen, Matthew J. Dolan, Sonia El Hedri +3
Simplified Models are a useful way to characterize new physics scenarios for the LHC. Particle decays are often represented using non-renormalizable operators that involve the mini…
The Coannihilation Codex
Michael J. Baker, Joachim Brod, Sonia El Hedri +8
We present a general classification of simplified models that lead to dark matter (DM) coannihilation processes of the form DM + X SM + SM, where X is a coann…
Towards an Understanding of the Correlations in Jet Substructure
D. Adams, A. Arce, L. Asquith +83
Over the past decade, a large number of jet substructure observables have been proposed in the literature, and explored at the LHC experiments. Such observables attempt to utilize…
Perturbative Unitarity Constraints on Charged/Colored Portals
Matthew Cahill-Rowley, Sonia El Hedri, William Shepherd +1
Dark matter that was once in thermal equilibrium with the Standard Model is generally prohibited from obtaining all of its mass from the electroweak or QCD phase transitions. This…
Perturbative Unitarity Constraints on Gauge Portals
Sonia El Hedri, William Shepherd, Devin G. E. Walker
Dark matter that was once in thermal equilibrium with the Standard Model is generally prohibited from obtaining all of its mass from the electroweak phase transition. This implies…
Perturbative Unitarity Constraints on the NMSSM Higgs Sector
Kassahun Betre, Sonia El Hedri, Devin G. E. Walker
We place perturbative unitarity constraints on both the dimensionful and dimensionless parameters in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) Higgs Sector. These c…
Perturbative Unitarity Constraints on a Supersymmetric Higgs Portal
Kassahun Betre, Sonia El Hedri, Devin G. E. Walker
We place perturbative unitarity constraints on both the dimensionful and dimensionless couplings in the Next-to-Minimal Supersymmetric Standard Model Higgs Sector. These constraint…
Exploring the dark side of the top Yukawa
Sonia El Hedri, Patrick J. Fox, Jay G. Wacker
We investigate simple extensions of the Standard Model that could lead to the negative values of the top Yukawa coupling still allowed by the ATLAS Higgs results. Integrating out t…
Minimal Signatures of Naturalness
Sonia El Hedri, Anson Hook
We study the naturalness problem using a model independent bottom up approach by considering models where only the interaction terms needed to cancel the Higgs quadratic divergence…
Learning How to Count: A High Multiplicity Search for the LHC
Sonia El Hedri, Anson Hook, Martin Jankowiak +1
We introduce a search technique that is sensitive to a broad class of signals with large final state multiplicities. Events are clustered into large radius jets and jet substructur…
Simplified Models for LHC New Physics Searches
Daniele Alves, Nima Arkani-Hamed, Sanjay Arora +92
This document proposes a collection of simplified models relevant to the design of new-physics searches at the LHC and the characterization of their results. Both ATLAS and CMS hav…