2009/04/30 by Yu-Xiao Liu, Jie Yang, Zhen-Hua Zhao +2 · 1 citation
Physics and Astronomy · #hep-th
paper · pdf · doi:10.1103/physrevd.80.065019
published as Phys.Rev.D80:065019,2009 · 23 pages, 35 figures, discussion and references added, to appear in PRD
arxiv created 2009/08/29 · arxiv updated 2009/12/01
In arXiv:0901.3543, the simplest Yukawa coupling ηΨϕχΨ was considered for a two-scalar-generated Bloch brane model. Fermionic resonances for both chiralities were obtained, and their appearance is related to branes with internal structure. Inspired on this result, we investigate the localization and resonance spectrum of fermions on a one-scalar-generated dS thick brane with a class of scalar-fermion couplings ηΨϕkΨ with positive odd integer k. A set of massive fermionic resonances for both chiralities are obtained when provided large couple constant η. We find that the masses and life-times of left and right chiral resonances are almost the same, which demonstrates that it is possible to compose massive Dirac fermions from the left and right chiral resonances. The resonance with lower mass has longer life-time. For a same set of parameters, the number of resonances increases with k and the life-time of the lower level resonance for larger k is much longer than the one for smaller k.