Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | https://arxiv.org/abs/2504.13649 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Inhaltsangabe:
- Applying the light-cone sum rules (LCSR) approach, the next-to-leading-order (NLO) corrections to $B \to A$ form factors are calculated with the twist-two and twist-three $B$ meson light-cone distribution amplitudes (LCDAs) at leading power in $Λ/ m_b$. At one-loop level, the vacuum-to-$B$-meson correlation functions defined with interpolating currents for the $p$-wave axial-vector meson are factorized into short-distance coefficients and the distribution amplitudes (DAs) of the $B$ meson, among which the hard coefficients for A0-type currents and $μ$ dependent jet functions entering correlation functions $Π_{μ,\|}^{(T+\tilde{T})}$, $Π_{δμ,\perp}^{(V-A)}$ and $Π_{δμ,\perp}^{(T+\tilde{T})}$ are identical to the corresponding ones of $B \to V$ in SCET. In addition, $Π_{μ,\|}^{(V-A)}$ and $Π_{μ,\|}^{(T+\tilde{T})}$ coincide with the results of $B\to π,K$ under the limit $m_q \to 0$ up to one-loop accuracy. Then the subleading power corrections to $B \to A$ form factors are computed with the higher-twist $B$ meson LCDAs at tree level up to the twist-six accuracy. Furthermore, we predict the $q^2$ dependence of $B \to A$ form factors via the Bourrely-Caprini-Lellouch (BCL) $z$-series expanding parameterization to compute several physical observables including branching ratios of semileptonic $B\to A \ell \barν_{\ell} $ and $B\to A ν_{\ell} \barν_{\ell} $ processes, transverse asymmetries, forward-backward asymmetries and lepton flavor universality observables employing the given mixing angles $θ_K=-34^\circ$, $θ_{1_{P_1}}=28^\circ$, $θ_{3_{P_1}}=23^\circ$. We also compare our theory calculations with the results from other methods.