The HZZ? Coupling And The Higgs-Strahlung Production Pp ? ZH At The LHC

The Standard Model?SM?of particle physics successfully describes the parts of elementary interactions between particles using gauge symmetry.The predictions of the SM almost have been experimentally tested in many precise experiments.The SM introduces a fundamental scalar field,its non-zero VEV can induce electroweak symmetry breaking in which W±boson,Z boson and fermions obtain masses.The neutral component of the scalar field is Higgs boson.In 2012,Higgs boson was found with mass around 125 GeV at the LHC.There is a deviation between theoretical prediction and experiment,so the new physics beyond SM should be studied.Whether the scalar particle is the one predicted by SM,has yet to be explored.So the main objective of the current and future high energy experiments is studying properties of Higgs boson.LHC and upcoming ILC will measure Higgs boson couplings to fermions,gauge bosons and its self-coupling and compare with the most accurate SM theoretical predictions.Any deviation from the SM predictions could be the information about new physics models.The Higgs-strahlung production pp ? Z?? ZH at the LHC is an important process for studying the HZZ?coupling.We take the B-L model and the nonuniversal SU?2?₁×SU?2?₂×U?1?_Y model as two examples and investigate their correction effects on ZH production.Our numerical results show that,the contributions of the B-L model to the ZH production cross section are very small,while the nonuniversal SU?2?₁× SU?2?₂× U?1?_Y model can generate significant contributions.