Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-24
Phys.Lett. B513 (2001) 330
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages including 5 figures; Changes: 1-added some sentences; 2-enlarged the figures; 3-added some references
Scientific paper
10.1016/S0370-2693(01)00481-6
We discuss a necessary nonvalence contribution in timelike exclusive processes. Following a Schwinger-Dyson type of approach, we relate the nonvalence contribution to an ordinary light-front wave function that has been extensively tested in the spacelike exclusive processes. A complicate four-body energy denominator is exactly cancelled in summing the light-front time-ordered amplitudes. Applying our method to $K_{\ell3}$ and $D^0\to K^- \ell^+ \nu_l$ where a rather substantial nonvalence contribution is expected, we find not only an improvement in comparing with the experimental data but also a covariance(i.e. frame-independence) of existing light-front constituent quark model.
Choi Ho-Meoyng
Ji Chueng-Ryong
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