2021/06/25 by Ben Pullin, Pullin, Ben, Roman Zwicky +1
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2106.13617
openalex publication_date 2021/06/25 · openalex created_date 2021/07/05 · openalex updated_date 2026/07/28
The on-shell matrix elements, or couplings gH H^*(H1)γ, describing the B(D)q^* → B(D)q γ and B1 q → Bq γ (q = u,d,s) radiative decays, are determined from light-cone sum rules at next-to-leading order for the first time. Two different interpolating operators are used for the vector meson, providing additional robustness to our results. For the D^*-meson, where some rates are experimentally known, agreement is found. The couplings are of additional interest as they govern the lowest pole residue in the B(D) → γ form factors which in turn are connected to QED-corrections in leptonic decays B(D) → ℓ ν. Since the couplings and residues are related by the decay constants fH^*(H1) and fTH^*(H1) respectively, we determine them at next-leading order as a by-product. The quantities \ fH^*T, fH1,fH1T\ have not previously been subjected to a QCD sum rule determination. All results are compared with the existing experimental and theoretical literature.