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Future Fellowships - Grant ID: FT140100244

Title
Future Fellowships - Grant ID: FT140100244
Funding
ARC | Future Fellowships
Contract (GA) number
FT140100244
Start Date
2014/01/01
End Date
2018/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/FT140100244

 

  • Collider constraints on tuning in composite Higgs models

    Barnard, James; White, Martin (2015)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    Two potential sources of tuning exist in composite Higgs models: one comes from keeping the Higgs VEV below the compositeness scale and one comes from keeping the Higgs light after constraints on the top partner masses are applied. We construct a measure that determines whether these tunings are independent or not and combines them appropriately. We perform a comprehensive scan of the parameter space for three explicit models and report the minimum tuning values compatible with existing colli...

    LUX likelihood and limits on spin-independent and spin-dependent WIMP couplings with LUXCalc

    Savage, Christopher; Scaffidi, Andre; White, Martin; Williams, Anthony G. (2015)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    We present LUXCalc, a new utility for calculating likelihoods and deriving WIMP-nucleon coupling limits from the recent results of the LUX direct search dark matter experiment. After a brief review of WIMP-nucleon scattering, we derive LUX limits on the spin-dependent WIMP-nucleon couplings over a broad range of WIMP masses, under standard assumptions on the relevant astrophysical parameters. We find that, under these and other common assumptions, LUX excludes the entire spin-dependent parame...

    Interpreting the Fermi-LAT gamma ray excess in the simplified framework

    Bal√°zs, Csaba; Li, Tong; Savage, Chris; White, Martin (2015)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    We test the plausibility that a Majorana fermion dark matter candidate with a scalar mediator explains the gamma ray excess from the Galactic center. Assuming that the mediator couples to all third generation fermions we calculate observables for dark matter abundance and scattering on nuclei, gamma, positron, and anti-proton cosmic ray fluxes, radio emission from dark matter annihilation, and the effect of dark matter annihilations on the CMB. After discarding the controversial radio observa...

    On the direct detection of multi-component dark matter: sensitivity studies and parameter estimation

    Herrero-Garcia, Juan; Scaffidi, Andre; White, Martin; Williams, Anthony G. (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    We study the case of multi-component dark matter, in particular how direct detection signals are modified in the presence of several stable weakly-interacting-massive particles. Assuming a positive signal in a future direct detection experiment, stemming from two dark matter components, we study the region in parameter space where it is possible to distinguish a one from a two-component dark matter spectrum. First, we leave as free parameters the two dark matter masses and show that the two h...

    Reproducing the DAMA/LIBRA phase-2 results with two dark matter components

    Herrero-Garcia, Juan; Scaffidi, Andre; White, Martin; Williams, Anthony G. (2018)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    Recently the DAMA/LIBRA collaboration released the long-waited phase-2 results with a lower energy threshold. It was recently argued that a one-component dark matter explanation of the observed annual modulation is strongly disfavoured or excluded unless isospin-violating couplings are invoked. In this short letter, we make the observation that dark matter comprising both a light and a heavy state can reproduce the observed spectrum without the need to invoke fine-tuned isospin-violating coup...

    Gamma rays from muons from WIMPs: Implementation of radiative muon decays for dark matter analyses

    Scaffidi, Andre; Freese, Katherine; Li, Jinmian; Savage, Christopher; White, Martin; Williams, Anthony G. (2016)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    Dark matter searches in gamma ray final states often make use of the fact that photons can be produced from final state muons. Modern Monte Carlo generators and DM codes include the effects of final state radiation from muons produced in the dark matter annihilation process itself, but neglect the O(1%) radiative correction that arises from the subsequent muon decay. After implementing this correction we demonstrate the effect that it can have on dark matter phenomenology by considering the c...

    Constraining fine tuning in Composite Higgs Models with partially composite leptons

    Barnard, James; Murnane, Daniel; White, Martin; Williams, Anthony G. (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    Minimal Composite Higgs Models (MCHM) have long provided a solution to the hierarchy problem of the Standard Model, yet suffer from various sources of fine tuning that are becoming increasingly problematic with the lack of new physics observations at the LHC. We develop a new fine tuning measure that accurately counts each contribution to fine tuning (single, double, triple, etc) that can occur in a theory with $n_p$ parameters, that must reproduce $n_o$ observables. We then use a novel scann...

    Gravitational wave, collider and dark matter signals from a scalar singlet electroweak baryogenesis

    Beniwal, Ankit; Lewicki, Marek; Wells, James D.; White, Martin; Williams, Anthony G. (2017)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    We analyse a simple extension of the SM with just an additional scalar singlet coupled to the Higgs boson. We discuss the possible probes for electroweak baryogenesis in this model including collider searches, gravitational wave and direct dark matter detection signals. We show that a large portion of the model parameter space exists where the observation of gravitational waves would allow detection while the indirect collider searches would not.

    Effect of electromagnetic dipole dark matter on energy transport in the solar interior

    Geytenbeek, Ben; Rao, Soumya; Scott, Pat; Serenelli, Aldo; Vincent, Aaron C; White, Martin; Williams, Anthony G (2016)
    Projects: RCUK | The astroparticle road to new physics (ST/K00414X/1), ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244)
    In recent years, a revised set of solar abundances has led to a discrepancy in the sound-speed profile between helioseismology and theoretical solar models. Conventional solutions require additional mechanisms for energy transport within the Sun. Vincent et al. have recently suggested that dark matter with a momentum or velocity dependent cross section could provide a solution. In this work, we consider three models of dark matter with such cross sections and their effect on the stellar struc...

    Combined analysis of effective Higgs portal dark matter models

    Beniwal, Ankit; Rajec, Filip; Savage, Christopher; Scott, Pat; Weniger, Christoph; White, Martin; Williams, Anthony G. (2015)
    Projects: ARC | Future Fellowships - Grant ID: FT140100244 (FT140100244), RCUK | The astroparticle road to new physics (ST/K00414X/1)
    We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of dark matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form $\mathcal{O}_{\textrm{DM}}\, H^\dagger H$. For the fermion models, we take an admixture of scalar $\overline{\psi} \psi$ and pseudoscalar $\overline{\psi} i\gamma_5 \psi$ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured...
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