The Studies Of Charged Higgs Bosons In The Next-to-minimal Supersymmetric Standard Model

The development of particle physics is very rapid nowadays.It mainly studies the structure, properties and interaction of matters in the microcosm(e.g.quarks,electrons,neutrinos,etc.).In July 2012,both the ATLAS and CMS collaborations at the Large Hadron Collider(LHC)discovered the final particle of the standard model,which is established to be Higgs boson.This discovery makes the standard model more perfect and opens a new era of particle physics.The standard model makes the basic building blocks of matters connected by weak,strong and electromagnetic interactions to form the world.Standard model is a successful theory to describe strong,weak and electromagnetic interactions so far.With the advancement of experiments,the standard model has been gradually interpreted,but some problems have emerged,such as the standard model cannot achieve the unification of interactions,neutrinos with mass and so on.To solve these problems,physicists have proposed some new models,such as the Minimal Supersymmetric Standard Model(MSSM),the Next-To-Minimal Supersymmetric Standard Model(NMSSM),etc.This paper mainly conduct a study in the NMSSM.As time goes on,more and more problems have been found,such as Dark matter detection experiment finds cosmic rays beyond galactic center;the problem of the?parameters in MSSM and so on.As the simplest extension of MSSM,the NMSSM introduces an additional Higgs singlet field,which obtains the vacuum expectation value to generate the effective?-term.The introduction of singlet field makes the mass of Higgs boson enhanced at tree level,which makes NMSSM more natural in explaining the mass of Higgs.Charged Higgs bosons is a crucial prediction of new physics beyond the SM.In this work,we perform a comprehensive scan over the parameter space of NMSSM considering various experimental constraints including the direct search limits from the 13TeV LHC,and consider the scenario that the next-to-lightest CP-even Higgs boson is SM-like.We find that the masses of charged Higgs bosons can be as light as 350GeV,the lightest CP-even Higgs boson?is predominantly singlet and can be as light as48GeV,and the lightest CP-odd Higgs boson(6 is also singlet-dominated and can be as light as 82GeV.The charged Higgs bosons mainly decay to t b,but the branching ratio of the exotic decays~±?(2~±?and~±?(2~±(6 can maximally reach to 20%and 11%,respectively,which can be used to distinguish the NMSSM from MSSM.Such a heavy charged Higgs bosons is unaccessible at the 13TeV LHC with a luminosity of 36.1 1)(7 and its detection needs higher energy and/or higher luminosity.