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Identification of DM : from astrophysics to the LHC – DMAstroLHC

Identification of dark matter : from astrophysics to the LHC

There is strong evidence, from astrophysics and cosmological measurements that most of the matter that constitutes the universe is dark. This has stimulated numerous searches for DM which have reached a level of sensitivity where a discovery can be expected. Identifying the DM amongst the plethora of candidates all with their peculiar collider and astrophysics phenomenology, has thus become one of the central problems in particle physics today.

Objectives

The ultimate goal of this project is a precise determination of the microscopic properties of DM by taking advantage of the new data coming from the LHC as well as from indirect and direct detection. The interplay between the different detection modes will be central to identify the DM. To meet our objective we adopt a strategy that allows to cover many different possibilities while making reliable and precise theoretical predictions for observables.<br />

Our specific objectives include : 1) Analysis of the LHC data within the ATLAS Collaboration focusing on the search for new physics in channels that can constrain DM 2) Implications of LHC search results for new physics. and Higgs physics 3) Analysis of implications of AMS02, Fermi-LAT and HESS results for DM models 4) Combined fits of DM models to astroparticle and collider résultats.

Implications of LHC Higgs results in terms of new physics and DM. Developement of a tool for interpretation of LHC limits in generic extensions of the SM. Development of micrOMEGAs to include a generalization of relic density computation and Higgs observables. Release of first results of AMS. Constraints from anti-proton spectrum on specific dark matter models. Theoretical prediction of cosmic antiproton and helium spetra.
Diffuse gamma-ray spectra and DM.

Despite several anomalies detected in dark matter searches and the discovery of a new particle at the LHC, we still have no conclusive evidence on dark matter.. We will pursue the development of tools for DM studies and simulations at colliders that encompass all observables for a variety of DM candidates while preparing for the interpretation of the wealth of new data expected during the time scale of this project.

G.A.Gomez-Vargas {\it et al.}, Dark Matter implications of Fermi-LAT measurement of anisotropies in the diffuse gamma-ray background,
[arXiv:1303.2154 [astro-ph.HE]]

G.Bernard, T.Delahaye, Y.-Y.Keum, W.Liu, P.Salati and R.Taillet, No More Anomaly in the TeV Cosmic Ray Proton and Helium Spectra,
arXiv:1207.4670 [astro-ph.HE].

G.Belanger, B.Dumont, U.Ellwanger, J.F.Gunion and S.Kraml, Status of invisible Higgs decays, arXiv:1302.5694 [hep-ph].

G.Belanger, B.Dumont, U.Ellwanger, J.F.Gunion and S.Kraml, Higgs Couplings at the End of 2012, JHEP 1302 (2013) 053

G.Belanger, R.M.Godbole, L.Hartgring and I.Niessen, Top Polarization in Stop Production at the LHC, arXiv:1212.3526 [hep-ph]

G.Belanger, K.Kannike, A.Pukhov and M.Raidal, Z3 Scalar Singlet Dark Matter, JCAP 1301(2013) 022

G.Belanger, U.Ellwanger, J.F.Gunion, Y.Jiang, S.Kraml and J.H.Schwarz, Higgs Bosons at 98 and 125 GeV at LEP and the LHC,
JHEP 1301 (2013) 069

A.Chatterjee, M.Drees and S.Kulkarni, Radiative Corrections to the Neutralino Dark Matter Relic Density - an Effective Coupling Approach,
Phys. Rev. D86 (2012) 105025

C.Weniger, P.D.Serpico, F.Iocco and G.Bertone, CMB bounds on dark matter annihilation: nucleon energy-losses after recombination,arXiv:1303.0942 [astro-ph.CO].

There is strong evidence, from astrophysics and cosmological measurements that most of the matter that constitutes the universe is dark. Early indications of the presence of dark matter (DM) from observations of rotation curves of galaxies and galaxy clusters were confirmed in the last few years with the precise extraction of the relic density of DM from WMAP measurements of the cosmic microwave background. This has stimulated numerous searches for DM which have reached a level of sensitivity where a discovery can be expected and has fuelled theoretical speculations on the nature of the DM. The favoured explanation for DM from the particle physics point of view is to postulate a new particle. It is intriguing that extensions of the Standard Model (SM) of electroweak and strong interactions, invented to solve problems such as the gauge hierarchy problem, often predict neutral stable and weakly interacting new particles, which are excellent DM candidates. Superweakly interacting particles can also describe the DM, while having very different signatures. Identifying the DM amongst the plethora of candidates all with their peculiar collider and astrophysics phenomenology, has thus become one of the central problems in particle physics today.

The year 2012 is expected to be a turning point for DM searches with the large experimental effort in place to corner the DM from different perspectives :
1) First the LHC is successfully taking data and searches for the DM is one of its priorities. The recent hints of a Higgs signal as well as results from searches for physics beyond the SM (BSM) constrain DM models. Discoveries of new particles predicted in extensions of the SM would allow to test models of new physics (NP) and thus the nature of DM.
2) Indirect searches that observe the decay products of dark matter annihilation into standard particles in the Galactic center or celestial bodies have already given hints of anomalies. The measurements of the photon or antimatter spectra will be pursued and refined with PAMELA, Fermi, HESS and AMS-02. Furthermore neutrino telescopes (ANTARES, ICECUBE) will also examine neutrino signatures that could originate from DM annihilation in the Galactic Center or capture in the Sun.
3) Direct DM searches which probe DM interactions with nuclei in large detectors are continuing to track the DM with detectors with an ever increasing volume and sensitivity. A signal would bring conclusive evidence that some new particle indeed constitute the DM.
4) The PLANCK satellite launched in 2009 should bring a more precise determination of the parameters of the cosmological model including the DM relic density.

Unravelling the nature of DM is a multidisciplinary issue involving particle and astroparticle collaboration associating theorists and experimentalists from these two communities. Our group has a unique expertise in developing tools for DM studies and simulations at colliders that encompass all observables for a variety of DM candidates. We are therefore in a pole position to exploit the wealth of data expected which will have tremendous impact on the identification of the DM candidate. One of the most important aspect of our project is the interplay between different detection modes, that is exploiting the information from colliders to refine predictions on DM in astroparticle and cosmology or vice-versa.

Project coordination

Geneviève Bélanger (Laboratoire d'Annecy-le-Vieux de Physique Theorique) – belanger@lapp.in2p3.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

LAPTH Laboratoire d'Annecy-le-Vieux de Physique Theorique
LAPP Laboratoire d'Annecy-le-Vieux de physique des particules
LPSC Laboratoire de physique subatomique et de cosmologie de Grenoble

Help of the ANR 505,752 euros
Beginning and duration of the scientific project: August 2012 - 48 Months

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