Search for dark matter in events with a z boson and missing transverse momentum in pp collisions at root s=8 TeV with the ATLAS detector
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CitationADD, G., ABAJYAN, T., ABBOTT, B., ABDALLAH, J., KHALEK, S.A., ABDINOV, O., ATLAS Collaboration. (2014). Search for dark matter in events with a z boson and missing transverse momentum in pp collisions at root s=8 TeV with the ATLAS detector. Physical Review D, 90 (1), 21p. http://dx.doi.org/10.1103/PhysRevD.90.012004.
A search is presented for production of dark-matter particles recoiling against a leptonically decaying Z boson in 20.3 fb(-1) of pp collisions at root s = 8 TeV with the ATLAS detector at the Large Hadron Collider. Events with large missing transverse momentum and two oppositely charged electrons or muons consistent with the decay of a Z boson are analyzed. No excess above the Standard Model prediction is observed. Limits are set on the mass scale of the contact interaction as a function of the dark-matter particle mass using an effective field theory description of the interaction of dark matter with quarks or with Z bosons. Limits are also set on the coupling and mediator mass of a model in which the interaction is mediated by a scalar particle.