2018/09/30 by Stefan von Buddenbrock, Alan S Cornell, Alan S. Cornell +6 · 17 citations
Computer Science · Physics and Astronomy · #Boson #Computational Physics and Python Applications #Large Hadron Collider #Lepton #Parameter space #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Quantum Chromodynamics and Particle Interactions #Scalar (mathematics) #Scalar boson #Singlet state #hep-ph
paper · pdf · doi:10.1088/1361-6471/ab3cf6
published in Journal of Physics G Nuclear and Particle Physics 46(11), 115001 (IOP Publishing) · Journal version: J Phys G: Nuclear and Particle Physics
openalex created_date 2018/09/27 · openalex publication_date 2019/08/20 · arxiv created 2019/08/28 · arxiv updated 2019/09/25 · openalex updated_date 2026/08/06
Abstract We study a two-Higgs doublet model extended with an additional singlet scalar (2HDM+S), and provide a brief introduction to the model and its parameters. Constraints are applied to the parameter space of this model in order to accommodate a number of features in the data that have been interpreted in von Buddenbrock et al (2018 J. Phys. G 45 115003) as the result of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>H</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="italic">Sh</mml:mi> </mml:math> decay produced via gluon–gluon fusion and in association with top quarks. Implications on the phenomenology of the heavy pseudo-scalar ( A ) and charged scalar ( H + ) are discussed. In particular, the decays <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>A</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="italic">ZH</mml:mi> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msup> <mml:mrow> <mml:mi>H</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>W</mml:mi> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> </mml:mrow> </mml:msup> <mml:mi>H</mml:mi> </mml:math> become prominent. This leads to final states with multiple leptons and b -quarks. The decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>A</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="italic">ZH</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="italic">ZSh</mml:mi> </mml:math> results in the production of a high transverse momentum Z produced in association with a lepton and two b -quarks with little additional jet activity. These predictions are compared to the data with model’s benchmark points. With the parameters obtained here the model is able to accommodate the features at the LHC reported in von Buddenbrock et al (2018 J. Phys. G 45 115003). Without varying these parameters additional excesses in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic">Zb</mml:mi> <mml:mover accent="true"> <mml:mrow> <mml:mi>b</mml:mi> </mml:mrow> <mml:mrow> <mml:mo stretchy="true">¯</mml:mo> </mml:mrow> </mml:mover> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>t</mml:mi> <mml:mover accent="true"> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mo stretchy="true">¯</mml:mo> </mml:mrow> </mml:mover> </mml:math> invariant mass spectra, and the production of 3 leptons plus two b -tagged jets can be explained assuming m A ≈ 600 GeV.