Correlated PQCD analysis of the semileptonic decays $$\overline{B}^0 \rightarrow D^{(*)+}\ell ^-\bar{\nu }_\ell $$ and the nonleptonic decays $$ \overline{B}^0 \rightarrow D^{(*)+}\pi ^-$$
Year: 2025
Type: article
Abstract: We present a unified analysis of $$\overline{B}^0 \rightarrow D^{(*)+}\ell ^-\bar{\nu }_\ell $$ B ¯ 0 → D ( ∗ ) + ℓ - ν ¯ ℓ and $$\overline{B}^0 \rightarrow D^{(*)+}\pi ^-$$ B ¯ 0 → D ( ∗ ) + π - decays using the perturbative QCD (PQCD) approach. The $$B \rightarrow D^{(*)}$$ B → D ( ∗ ) transition form factors are calculated at low $$q^2$$ q 2 and extrapolated to the high- $$q^2$$ q 2 region using the latest lattice QCD results via a model-independent z -expansion. This hybrid method provides a precise form factor description across the full kinematic range. We then predict the branching fractions and the lepton flavor universality ratios $$R(D) = 0.336^{+0.014}_{-0.013}$$ R ( D ) = 0 . 336 - 0.013 + 0.014 and $$R(D^*) = 0.271^{+0.010}_{-0.010},$$ R ( D ∗ ) = 0 . 271 - 0.010 + 0.010 , which are consistent with the latest experimental averages. Furthermore, we perform a correlated study of the nonleptonic $$ \overline{B}^0 \rightarrow D^{(*)+}\pi ^-$$ B ¯ 0
Source: The European Physical Journal C
Authors: Mao-Jing Liu, Ying Li, Zhi-Tian Zou
Institution: Yantai University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4417534239