Flavor changing heavy Higgs interactions at the LHC

A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral Higgs (FCNH) decay ϕ0→tc¯+t¯c, where ϕ0 could be a CP-even scalar (H0) or a CP-odd pseudoscalar (A0). Measurement of the light 125 GeV neutral Higgs boson (h0) couplings at the Large Hadron Collider...

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Bibliographic Details
Published in:Physics letters. B 2015-12, Vol.751 (C), p.135-142
Main Authors: Altunkaynak, Baris, Hou, Wei-Shu, Kao, Chung, Kohda, Masaya, McCoy, Brent
Format: Article
Language:English
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Summary:A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral Higgs (FCNH) decay ϕ0→tc¯+t¯c, where ϕ0 could be a CP-even scalar (H0) or a CP-odd pseudoscalar (A0). Measurement of the light 125 GeV neutral Higgs boson (h0) couplings at the Large Hadron Collider (LHC) favor the decoupling limit or the alignment limit of a 2HDM, in which gauge boson and diagonal fermion couplings of h0 approach Standard Model values. In such limit, FCNH couplings of h0 are naturally suppressed by a small mixing parameter cos⁡(β−α), while the off-diagonal couplings of heavier neutral scalars ϕ0 are sustained by sin⁡(β−α)∼1. We study physics background from dominant processes with realistic acceptance cuts and tagging efficiencies. Promising results are found for the LHC running at 13 or 14 TeV collision energies.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2015.10.024