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arXiv · hep-ph/9712242

Factorization in Exclusive and Seminclusive Decays and Effective Theories for Massless Particles

U. Aglietti·G. Corbo`
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Abstract

We prove rigorously factorization in the seminclusive decay $B\to D^{(*)} + jet$ using the large energy effective theory. It is also shown that this effective theory is unable to consistently describe completely exclusive processes, such as the decay $B\to D^{(*)}+π(ρ)$, and therefore also related properties such as factorization. This is due to an oversimplification of transverse momentum dynamics. We present a variant of the large energy effective theory, i.e. a new effective theory for massless particles, which properly takes into account transverse momentum dynamics and is therefore the natural framework to study exclusive non-leptonic decays. Finally, it is shown that the collinear instability of the large energy effective theory disappears when seminclusive observables are considered.

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U. Aglietti, G. Corbo`. 1998-01-19. Factorization in Exclusive and Seminclusive Decays and Effective Theories for Massless Particles. https://doi.org/10.1142/s0217751x00000173

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