Scalar dark matter search at the LHC through flavor-changing neutral current top decay

Journal Article · Sun May 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.095017· OSTI ID:21541645

Tong, Li; Shafi, Qaisar ^[1]

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1. Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716 (United States)

We discuss an extended standard model electroweak sector which contains a stable scalar dark matter particle, the D boson. To search for the D boson at the LHC we exploit the flavor-changing neutral current top quark decay, t{yields}cDD, mediated by the lightest standard model-like Higgs h{sup 0} in a two Higgs doublet model framework. The branching ratio for t{yields}cDD in this case can be as high as 10{sup -3}, after taking into account constraints arising from the D boson relic abundance. With an integrated luminosity of 10(100) fb{sup -1}, the 14 TeV LHC can explore values of this branching ratio that are one (two) order of magnitude smaller in tt production with tt{yields}cbl{sup -}(cbl{sup +})+Ee{sub T}. For a D boson mass < or approx. 60 GeV, m{sub h}{sup 0} < or approx. 2M{sub Z}, 10 fb{sup -1} luminosity and a branching ratio BR(t{yields}cDD){approx}10{sup -4}, the estimated number of signal events at the 14 TeV LHC is of order 80.

• OSTI ID: 21541645
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 9; Other Information: DOI: 10.1103/PhysRevD.83.095017; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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