Abstract
To solve the ÎŒ problem and generate three tiny neutrino masses in the MSSM, the ÎŒ from Îœ Supersymmetric Standard Model (ΌΜSSM) introduces three singlet right- handed neutrino superfields, which lead to the mixing of the Higgs doublets with the sneutrinos. The mixing affects the lightest Higgs boson mass and the Higgs couplings. The present observed 95% CL upper limit on signal strength of the 125 GeV Higgs boson decay h â ZÎł is 6.6, which still is plenty of space to prove the existence of new physics. In this work, we investigate the signal strength of the 125 GeV Higgs boson decay channel h â ZÎł in the ΌΜSSM. Besides, we consider the two-loop electroweak corrections of muon anomalous magnetic dipole moment (MDM) in the model, which also make important contributions compared with one-loop electroweak corrections.
Highlights
The Ό from Μ Supersymmetric Standard Model (ΌΜSSM)In addition to the minimal supersymmetric standard model (MSSM) Yukawa couplings for quarks and charged leptons, the superpotential of the ΌΜSSM contains Yukawa couplings for neutrinos, two additional types of terms involving the Higgs doublet superfields Hu and Hd, and the right-handed neutrino superfields Μic, [48]
Will represent a major undertaking of modern particle physics and a probable probe of new physics
In the ÎŒ from Îœ Supersymmetric Standard Model (ΌΜSSM), the left- and right-handed sneutrino vacuum expectation values (VEVs) lead to the mixing of the neutral components of the Higgs doublets with the sneutrinos producing an 8 Ă 8 CP-even neutral scalar mass matrix, which can be seen in refs. [49, 50, 53]
Summary
In addition to the MSSM Yukawa couplings for quarks and charged leptons, the superpotential of the ΌΜSSM contains Yukawa couplings for neutrinos, two additional types of terms involving the Higgs doublet superfields Hu and Hd, and the right-handed neutrino superfields Îœic, [48]. In the ΌΜSSM, the left- and right-handed sneutrino VEVs lead to the mixing of the neutral components of the Higgs doublets with the sneutrinos producing an 8 Ă 8 CP-even neutral scalar mass matrix, which can be seen in refs. In figure 1, we plot the one-loop diagrams contributing to the decay h â ZÎł in the ΌΜSSM, where F denotes the fermions and the charginos, W is the W gauge boson, S± denotes the charged scalars, and fshows the sfermions. The decay width of h â ZÎł at leading order (LO) in the ΌΜSSM is mediated by charged heavy particle loops built up by W bosons, standard fermions f , charged scalars Sα±, charginos Ïi and sfermions f. Through eqs. (3.3)â(3.5), we can quantify the signal strength for the Higgs boson decay channel h â ZÎł in the ΌΜSSM
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