2024/10/27 by Faisal Munir Bhutta, Bhutta, Faisal Munir, A. Rehman +7
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Computational Physics and Python Applications
paper · pdf · doi:10.48550/arxiv.2410.20633
Recent measurements of the lepton flavor universality ratios RμeK and RμeK^* in B→ (K, K^*)μ+μ-(e+e-) at LHCb align with the Standard Model predictions, necessitating search for the complementary decay modes. In this context, we derive the angular decay distributions of the four-fold B → K1(1270,1400)(→ V P) μ+μ- decays, where K1 is an axial-vector meson, V=ρ, K∗, and P=K, π. Considering the weak effective Hamiltonian with vector and axial-vector new physics operators, and employing the helicity formalism, we obtain the four-dimensional differential decay distributions and extract various physical observables. These include differential branching ratios, lepton forward-backward asymmetry, forward-backward asymmetry for transversely polarized K1 meson, longitudinal and transverse polarization fractions of the K1 meson, and the normalized angular coefficients with longitudinally and transversely polarized final state vector meson V, in the cascade decay K1→ VP. Based on the latest global fit analysis data for all b→ s transitions, we predict the results of these observables in various bins of the square of the momentum transfer, q2. Our findings indicate that these physical observables are not only sensitive to new physics but can also differentiate between various new physics scenarios in certain kinematical regions. The precise measurements of these observables in B → K1(1270,1400)(→ V P) μ+μ- decays at current and future experiments will provide opportunities for the complementary searches for physics beyond the Standard Model in b→ sℓ+ℓ- decays.