Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-04-11
Phys.Rev.D80:065019,2009
Physics
High Energy Physics
High Energy Physics - Theory
23 pages, 35 figures, discussion and references added, to appear in PRD
Scientific paper
10.1103/PhysRevD.80.065019
In arXiv:0901.3543, the simplest Yukawa coupling $\eta\bar{\Psi}\phi\chi\Psi$ 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 $\eta\bar{\Psi}\phi^k\Psi$ with positive odd integer $k$. A set of massive fermionic resonances for both chiralities are obtained when provided large couple constant $\eta$. 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 $k$.
Duan Yi-Shi
Fu Chun-E
Liu Yu-Xiao
Yang Jie
Zhao Zhen-Hua
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