Search for direct top squark pair production in events with a Higgs or <math xmlns="http://www.w3.org/1998/Math/MathML">
  <mi>Z</mi>
</math> boson, and missing transverse momentum in <math xmlns="http://www.w3.org/1998/Math/MathML">
  <msqrt>
    <mi>s</mi>
  </msqrt>
  <mo>=</mo>
  <mn>13</mn>
</math> TeV <math xmlns="http://www.w3.org/1998/Math/MathML">
  <mi>p</mi>
  <mi>p</mi>
</math> collisions with the ATLAS detector
OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)