Limits...
Search for dark matter in events with heavy quarks and missing transverse momentum in [Formula: see text] collisions with the ATLAS detector.

- Eur Phys J C Part Fields (2015)

Bottom Line: The data are found to be consistent with the Standard Model expectations and limits are set on the mass scale of effective field theories that describe scalar and tensor interactions between dark matter and Standard Model particles.These limits are particularly strong for low-mass dark matter.Using a simplified model, constraints are set on the mass of dark matter and of a coloured mediator suitable to explain a possible signal of annihilating dark matter.

View Article: PubMed Central - PubMed

Affiliation: CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.

ABSTRACT

This article reports on a search for dark matter pair production in association with bottom or top quarks in [Formula: see text] of [Formula: see text] collisions collected at [Formula: see text] TeV by the ATLAS detector at the LHC. Events with large missing transverse momentum are selected when produced in association with high-momentum jets of which one or more are identified as jets containing [Formula: see text]-quarks. Final states with top quarks are selected by requiring a high jet multiplicity and in some cases a single lepton. The data are found to be consistent with the Standard Model expectations and limits are set on the mass scale of effective field theories that describe scalar and tensor interactions between dark matter and Standard Model particles. Limits on the dark-matter-nucleon cross-section for spin-independent and spin-dependent interactions are also provided. These limits are particularly strong for low-mass dark matter. Using a simplified model, constraints are set on the mass of dark matter and of a coloured mediator suitable to explain a possible signal of annihilating dark matter.

No MeSH data available.


Related in: MedlinePlus

Example of DM production in the -FDM model
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Fig2: Example of DM production in the -FDM model

Mentions: The results are also interpreted in light of a bottom-Flavoured Dark Matter model (-FDM) [27]. The -FDM model was proposed to explain the excess of gamma rays from the galactic centre, recently observed by the Fermi Gamma-ray Space Telescope, and interpreted as a signal for DM annihilation [28]. This analysis of the data recorded by the Fermi-LAT collaboration favours DM with a mass of approximately 35 GeV annihilating into -quarks via a coloured mediator. In this model, a new scalar field, , mediates the interactions between DM and quarks as shown in Fig. 2. DM is assumed to be a Dirac fermion that couples to right-handed, down-type quarks. The lightest DM particle, which constitutes cosmic DM, preferentially couples to -quarks. The collider signature of this model is -quarks produced in association with missing transverse momentum. This analysis sets constraints on the mass of the mediator and DM particle in the framework of the -FDM model.Table 1


Search for dark matter in events with heavy quarks and missing transverse momentum in [Formula: see text] collisions with the ATLAS detector.

- Eur Phys J C Part Fields (2015)

Example of DM production in the -FDM model
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4376411&req=5

Fig2: Example of DM production in the -FDM model
Mentions: The results are also interpreted in light of a bottom-Flavoured Dark Matter model (-FDM) [27]. The -FDM model was proposed to explain the excess of gamma rays from the galactic centre, recently observed by the Fermi Gamma-ray Space Telescope, and interpreted as a signal for DM annihilation [28]. This analysis of the data recorded by the Fermi-LAT collaboration favours DM with a mass of approximately 35 GeV annihilating into -quarks via a coloured mediator. In this model, a new scalar field, , mediates the interactions between DM and quarks as shown in Fig. 2. DM is assumed to be a Dirac fermion that couples to right-handed, down-type quarks. The lightest DM particle, which constitutes cosmic DM, preferentially couples to -quarks. The collider signature of this model is -quarks produced in association with missing transverse momentum. This analysis sets constraints on the mass of the mediator and DM particle in the framework of the -FDM model.Table 1

Bottom Line: The data are found to be consistent with the Standard Model expectations and limits are set on the mass scale of effective field theories that describe scalar and tensor interactions between dark matter and Standard Model particles.These limits are particularly strong for low-mass dark matter.Using a simplified model, constraints are set on the mass of dark matter and of a coloured mediator suitable to explain a possible signal of annihilating dark matter.

View Article: PubMed Central - PubMed

Affiliation: CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.

ABSTRACT

This article reports on a search for dark matter pair production in association with bottom or top quarks in [Formula: see text] of [Formula: see text] collisions collected at [Formula: see text] TeV by the ATLAS detector at the LHC. Events with large missing transverse momentum are selected when produced in association with high-momentum jets of which one or more are identified as jets containing [Formula: see text]-quarks. Final states with top quarks are selected by requiring a high jet multiplicity and in some cases a single lepton. The data are found to be consistent with the Standard Model expectations and limits are set on the mass scale of effective field theories that describe scalar and tensor interactions between dark matter and Standard Model particles. Limits on the dark-matter-nucleon cross-section for spin-independent and spin-dependent interactions are also provided. These limits are particularly strong for low-mass dark matter. Using a simplified model, constraints are set on the mass of dark matter and of a coloured mediator suitable to explain a possible signal of annihilating dark matter.

No MeSH data available.


Related in: MedlinePlus