A Three-body partial decay width in the Littlest Higgs model

Thesis (B.S.)--University of Rochester. Dept. of Physics and Astronomy, 2007.The Littlest Higgs model, an extension to the Stndard Model of particle, One of those ZH, is heavy version of the Standard Model neutral weak boson. The decay width for the ZH has previously been calculated but only by including 2-body decays. The 3-body decay process ZH -> ZLHH is considered here. Its partial width is calculated via a Monte Carlo integration and plotted as a function of a mixing angle that in the Littlest Higgs model arises in mass diagonalization. From this the branching ratio for this process is calculated in order to quantify its significance. It was found that the branching ratio for this single process becomes significant (≥10%) for at least 25% of the parameter space