|DATE||January 25 (Tue), 2022|
|SPEAKER||Jeong, Jae Hoon|
|TITLE||Constructing the covariant 3-point vertex systematically|
|ABSTRACT||An algorithm is developed for efficiently constructing the Lorentz covariant effective three-point vertices of the decay of a particle into two daughter particles in which all the masses and spins of the three particles can be arbitrary. The closely-related one-to-one correspondence between the helicity formalism and the covariant formulation is exploited for counting the number of independent terms and identifying the basic covariant three-point vertices. Assembling the basic operators according to the developed algorithm enables us to construct all the covariant three-point vertices systematically. All the fundamental operators, which can appear in the three-point vertices, can be denoted by the linear combinations of the basic operators. It is shown that the general couplings of the three-vector-boson $V^* W^-W^+$ interaction with (V=\gamma or Z) derived according to our algorithm are consistent with those given in a previous work.