New effective treatment of the light-front nonvalence contribution in timelike exclusive processes

Abstract

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 $K_{\ell 3}$ 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.

10 pages including 5 figures; Changes: 1-added some sentences; 2-enlarged the figures; 3-added some references

References in corpus (5)

• Light-Front Quark Model Analysis of Exclusive $0^{-}$$\to$$0^{-}$ Semileptonic Heavy Meson Decays
• Light-Front Bethe-Salpeter Equation
• Regularizing the Divergent Structure of the Light-Front Currents
• Disentangling Intertwined Embedded States and Spin Effects in Light-Front Quantization
• Exploring the timelike region for the elastic form factor in the light-front quantization

Cited by in corpus (31)

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• Higher Fock State Contributions to the Generalized Parton Distribution of Pion
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• Current in the light-front Bethe-Salpeter formalism I: Replacement of non-wave function vertices
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