Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-14
Phys.Rev.D73:094005,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 3 figures, branching ratio is evaluated using the running quark masses at the top quark mass scale, results and concl
Scientific paper
10.1103/PhysRevD.73.094005
The one-loop induced top quark decay $t\to u_1\bar{u}_2u_2$ ($u_i=u,c$) is calculated in the context of the standard model. The dominant contribution to this top quark decay arises from the Feynman diagrams induced by the off-shell $tu_1g^*$ vertex, whereas the box diagrams are negligibly small. In contrast with the on-shell $tu_1g$ vertex, which only gives rise to a pure dipolar effect, the off-shell $tu_1g^*$ coupling also involves a monopolar term, which gives a larger contribution than the dipolar one. It is found that the branching ratio for the three-body decay $t\to u_1\bar{u}_2u_2$ is about of the same order of magnitude of the two-body decay $t\to u_1 g$, the latter being slightly larger, which stems from the fact that the three-body decay is dominated by a monopolar term.
Cordero-Cid Adriana
Hernandez Joan Manel
Tavares-Velasco G.
Toscano J. . J.
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