2025/01/02 by Qin Chang, Chang, Qin, De-Hua Yao +3
Physics and Astronomy · #FOS: Physical sciences #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.2501.01075
openalex publication_date 2025/01/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we study the B0 → J/ψh1 decays for the first time by using perturbative QCD approach up to the presently known next-to-leading order accuracy. The vertex corrections present significant contribution to the amplitude. In the calculation, the mixing between two light axial-vector mesons h1(1170) and h1(1415) are also studied in detail. The observables including the branching ratios, polarization fractions and CP asymmetries are predicted and discussed explicitly. It is found that the B0 → J/ψh1 decays have relatively large branching fractions, which are generally at the order of \cal O(10-6∼10-3), and thus are possible to be observed by the LHCb and Belle-II experiments in the near future. Moreover, they are very sensitive to the mixing angle θ and can be used to test the values of θ. In addition, some ratios between the branching fractions of B0 → J/ψh1 decays can provide much stronger constraints on θ due to their relatively small theoretical errors. The B0 → J/ψh1 decays are generally dominated by the longitudinal polarization contributions, specifically, fL(B0 → J/ψh1)>80%, except for the case that θ∼ 35^∘ and -55^∘. Unfortunately, the direct CP asymmetries of B0 → J/ψh1 decays are too small to be observed soon even if the effect of θ is considered. The future precise measurements on B0 → J/ψh1 decays are expected for testing these theoretical findings and exploring the interesting nature of h1(1170) and h1(1415).