Flavor changing heavy Higgs interactions at the LHC

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• 作者：Baris Altunkaynak^a ; ^{baris@physics.ou.edu" class="auth_mail" title="E-mail the corresponding author} ; Wei-Shu Hou^b ; ^{wshou@phys.ntu.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Chung Kao^a ; ^{kao@physics.ou.edu" class="auth_mail" title="E-mail the corresponding author} ; Masaya Kohda^c ; ^{mkohda@cycu.edu.tw" class="auth_mail" title="E-mail the corresponding author} ; Brent McCoy^a ; ^{mccoy@physics.ou.edu" class="auth_mail" title="E-mail the corresponding author}
• 刊名：Physics Letters B
• 出版年：2015
• 出版时间：17 December 2015
• 年：2015
• 卷：751
• 期：Complete
• 页码：135-142
• 全文大小：1574 K

文摘

A general two Higgs doublet model (2HDM) is adopted to study the signature of flavor changing neutral Higgs (FCNH) decay ${\varphi }^0\to t\overline{c}+\overline{t}c$, where ϕ⁰${\varphi }^0$ could be a CP-even scalar (H⁰$H^0$) or a CP-odd pseudoscalar (A⁰$A^0$). Measurement of the light 125 GeV neutral Higgs boson (h⁰$h^0$) 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$h^0$ approach Standard Model values. In such limit, FCNH couplings of h⁰$h^0$ are naturally suppressed by a small mixing parameter cos⁡(β−α)$\cos (\beta -\alpha )$, while the off-diagonal couplings of heavier neutral scalars ϕ⁰${\varphi }^0$ are sustained by sin⁡(β−α)∼1$\sin (\beta -\alpha )\sim 1$. 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.