Searching for Dark Matter with the ATLAS Detector by Steven Schramm

By Steven Schramm

This thesis describes the hunt for darkish topic on the LHC within the mono-jet plus lacking transverse momentum ultimate kingdom, utilizing the whole dataset recorded in 2012 by way of the ATLAS scan. it's the first time that the variety of jets isn't explicitly constrained to at least one or , hence expanding the sensitivity to new indications. in its place, a stability among the main vigorous jet and the lacking transverse momentum is needed, therefore determining mono-jet-like ultimate states. Collider searches for darkish subject have often used sign types applying potent box theories (EFTs), even if evaluating to effects from direct and oblique detection experiments, the place the variation in power scale renders many such comparisons invalid. The thesis good points the 1st powerful and complete therapy of the validity of EFTs in collider searches, and gives a way in which different classifications of darkish subject experiments could be in comparison on a legitimate and reasonable basis.

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In the time after these initial findings, numerous other similar experiments have been conducted. Oort’s observations have been enhanced [1], and Zwicky’s technique has been applied to many other clusters [14]. Thanks to velocity dispersion techniques, it now appears that spiral galaxies are associated with dark halos which extend out to 200 kPc from the galactic centre, well beyond the visible matter’s reach. Other techniques have also been developed, and gravitational lensing experiments have made observations which cannot be accounted for by the visible matter content [15].

Kopp, Constraints on dark matter annihilation from AMS-02 results. Phys. Rev. 076013 38. D. Simone, A. Riotto, W. Xue, Interpretation of AMS-02 results: correlations among dark matter signals. J. Cosmol. Astropart. Phys. org/1475-7516/ 2013/i=05/a=003 39. 5– 350 GeV. Phys. Rev. Lett. 1103/PhysRevLett. 141102 40. Fermi-LAT Collaboration, Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope. Phys. Rev. D 89, 042001 (2014), http://link. 042001 41.

Fig. 5 The full sky map of the CMB after foreground subtraction as measured by the Planck Collaboration. The colour scheme varies from −300 μK (blue) to 300 μK (red). Local temperature anisotropies are seen to be at the level of 10−4 K, while the global anisotropy is at the level of 10−5 K [21, 22] 16 1 Introduction and Motivation for Dark Matter A precision measurement of the anisotropies of the universe provides a significant amount of information, particularly when parametrized as the power spectrum in terms of the angular scale (or equivalently the angular moment of spherical harmonics).

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