arxiv: High Energy Physics::Phenomenology | High Energy Physics::Experiment
Several extensions of the standard model predict associated production of dark-matter particles with a Higgs boson. Such processes are searched for in final states with missing transverse momentum and a Higgs boson decaying to a b¯b pair with the ATLAS detector using 36... View more
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 ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the center of the detector and the z axis along the beam pipe. The x axis points to the center of the LHC ring, and the y axis points upward. Cylindrical coordinates ðr; ϕÞ are used in the transverse plane, ϕ being the azimuthal angle around the z axis. The pseudorapidity is defined in terms of the polar angle θ as η ¼ − ln tanðθ=2Þ. The distance between two objects in η-ϕ space is ΔR ¼ pffiðffiΔffiffiffiffiηffiffiÞffiffi2ffiffiffiþffiffiffiffiffiðffiffiΔffiffiffiϕffiffiffiÞffiffi2ffi. Transverse momentum is defined by pT ¼ p sin θ.
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