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Next-to-leading order corrections are an important aspect in the extractionof the Cabibbo- Kobayashi-Maskawa matrix elements $|V_{\text{cb}}|$ and$|V_{\text{ub}}|$ at $B$-factory experiments: virtual and real photons coupleto all charged particles of the decay, alter the resulting decay dynamics andenhance the total decay rate. We present a phenomenologically motivated modeland a Monte-Carlo implementation to study electromagnetic radiative correctionsto differential and total decay rates for semileptonic $B$-meson decays intoexclusive pseudoscalar and scalar final states and apply it to $B \to D \, l \,\nu$ and $B \to \pi \, l \, \nu$, and $B \to D_0^* \, l \, \nu$ decays,respectively. We study such corrections with a phenomenological picture ofpoint-like mesons (with some structure-dependent corrections), which is validin the low-energy region of the photons and whose results we extrapolate overthe complete phase space. The largest quantifiable uncertainty is due to theapproximative matching to the Standard Model. In addition unknownstructure-dependent contributions and model dependencies might have an impacton our findings.

A phenomenological model for radiative corrections in exclusive semileptonic B-meson decays to (pseudo)scalar final state mesons