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• W4384007650 abstract "Abstract This paper presents a search for dark matter, $$chi $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>χ</mml:mi> </mml:math> , using events with a single top quark and an energetic W boson. The analysis is based on proton–proton collision data collected with the ATLAS experiment at $$sqrt{s}=$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> </mml:mrow> </mml:math> 13 TeV during LHC Run 2 (2015–2018), corresponding to an integrated luminosity of 139 fb $$^{-1}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mrow /> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:math> . The search considers final states with zero or one charged lepton (electron or muon), at least one b -jet and large missing transverse momentum. In addition, a result from a previous search considering two-charged-lepton final states is included in the interpretation of the results. The data are found to be in good agreement with the Standard Model predictions and the results are interpreted in terms of 95% confidence-level exclusion limits in the context of a class of dark matter models involving an extended two-Higgs-doublet sector together with a pseudoscalar mediator particle. The search is particularly sensitive to on-shell production of the charged Higgs boson state, $$H^{pm }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>H</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> , arising from the two-Higgs-doublet mixing, and its semi-invisible decays via the mediator particle, a : $$H^{pm } rightarrow W^pm a (rightarrow chi chi )$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>H</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>W</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:mi>a</mml:mi> <mml:mrow> <mml:mo>(</mml:mo> <mml:mo>→</mml:mo> <mml:mi>χ</mml:mi> <mml:mi>χ</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> . Signal models with $$H^{pm }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>H</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> masses up to 1.5 TeV and a masses up to 350 GeV are excluded assuming a $$tan beta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>tan</mml:mo> <mml:mi>β</mml:mi> </mml:mrow> </mml:math> value of 1. For masses of a of 150 (250) GeV, $$tan beta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>tan</mml:mo> <mml:mi>β</mml:mi> </mml:mrow> </mml:math> values up to 2 are excluded for $$H^{pm }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>H</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> masses between 200 (400) GeV and 1.5 TeV. Signals with $$tan beta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mo>tan</mml:mo> <mml:mi>β</mml:mi> </mml:mrow> </mml:math> values between 20 and 30 are excluded for $$H^{pm }$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>H</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> masses between 500 and 800 GeV." @default.
• W4384007650 created "2023-07-13" @default.
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