Exact calculations of vertex $\bar{s}γb$ and $\bar{s} Z b$ in the unitary gauge
| dc.creator | Wu, Lu-sen | |
| dc.creator | Xiao, Zhen-jun | |
| dc.date | 2006-12-25 | |
| dc.date.accessioned | 2026-07-07T12:53:46Z | |
| dc.date.available | 2026-07-07T12:53:46Z | |
| dc.description | In this paper, we present the exact calculations for the vertex $\bar{s}γb$ and $\bar{s} Z b$ in the unitary gauge. We found that (a) the divergent- and $μ$-dependent terms are left in the effective vertex function $Γ^γ_μ(p,k)$ for $b \to s γ$ transition even after we sum up the contributions from four related Feynman diagrams; (b) for an on-shell photon, such terms do not contribute et al; (c) for off-shell photon, these terms will be canceled when the contributions from both vertex $\bar{s}γb$ and $\bar{s} Z b$ are taken into account simultaneously, and therefore the finite and gauge independent function $Z_0(x_t)=C_0(x_t)+ D_0(x_t)/4$, which governs the semi-leptonic decay $b \to s l^- l^+$, is derived in the unitary gauge. | |
| dc.description | 13 pages, 2 figures, Revtex | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0612326 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0612326 | |
| dc.identifier | Commun.Theor.Phys.48:502-508,2007 | |
| dc.identifier | doi:10.1088/0253-6102/48/3/024 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/223735 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Exact calculations of vertex $\bar{s}γb$ and $\bar{s} Z b$ in the unitary gauge | |
| dc.type | text |