Search for dark matter in events with a Z boson and missing transverse momentum in pp collisions at $\sqrt{s}$=8 TeV with the ATLAS detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2014) Physical review D — Vol. 90 (2014)

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<p>A search is presented for production of dark-matter particles recoiling against a leptonically decaying <inline-formula><mml:math display="inline"><mml:mi>Z</mml:mi></mml:math></inline-formula> boson in <inline-formula><mml:math display="inline"><mml:mrow><mml:mn>20.3</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>fb</mml:mi></mml:mrow><mml:mrow><mml:mo>-</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula> of <inline-formula><mml:math display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math></inline-formula> collisions at <inline-formula><mml:math display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>8</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math></inline-formula> 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 <inline-formula><mml:math display="inline"><mml:mi>Z</mml:mi></mml:math></inline-formula> 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 <inline-formula><mml:math display="inline"><mml:mi>Z</mml:mi></mml:math></inline-formula> bosons. Limits are also set on the coupling and mediator mass of a model in which the interaction is mediated by a scalar particle.</p>
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Tanasijczuk, A. J., ATLAS, & et al. (2014). Search for dark matter in events with a Z boson and missing transverse momentum in pp collisions at $\sqrt{s}$=8 TeV with the ATLAS detector. Physical review D, 90. https://doi.org/10.1103/PhysRevD.90.012004 (Original work published 2014)