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Miramontes, A. S., Raya, K., Bashir, A., Roig, P., & Paredes-Torres, G. (2025). Radially excited pion: electromagnetic form factor and the box contribution to the muon's g-2. Chin. Phys. C, 49(8), 083108–12pp.
Abstract: We investigate the properties of the radially excited charged pion, with a specific focus on its electromagnetic form factor (EFF) and its box contribution to the hadronic light-by-light (HLbL) component of the muon's anomalous magnetic moment, .Utilizing a coupled non perturbative framework combining Schwinger-Dysonand a μBethe-Salpeter equations, we first compute the mass and weak decay constant of the pion's first radial excitation. Initial results are provided for the Rainbow-Ladder (RL) approximation, followed by an extended beyond RL (BRL) analysis that incorporates meson cloud effects. Building on our previous work, this analysis demonstrates that an accurate description of the first radial excitation can be achieved without the need for a reparametrization of the interaction kernels. Having demonstrated the effectiveness of the truncation scheme, we proceed to calculate the corresponding EFF, from which we derive the contribution of the pion's first radial excitation to the HLbL component of the muon's anomalous magnetic moment, producing a(mu)(pi 1-box) (RL) = -(2.03 +/- 0.12) x 10(-13) a(mu)(pi 1-box) , μ(BRL) = -(2.02 +/- 0.10) x 10(-13). Our computation also sets the groundwork for calculating related pole contributions of excited pseudoscalar mesons to . a mu
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Vale Silva, L., Pich, A., & Solomonidi, E. (2024). Final-state interactions in the CP asymmetry of D meson two-body decays. Int. J. Mod. Phys. A, 39(26n27), 2442003–8pp.
Abstract: Urgent theoretical progress is needed in order to provide an estimate in the Standard Model of the recent measurement by LHCb of direct CP violation in charm-meson two-body decays. Rescattering effects must be taken into account for a meaningful theoretical description of the amplitudes involved in such category of observables, as signaled by the presence of large strong phases. We discuss the computation of the latter effects based on a two-channel coupled dispersion relation, which exploits isospin-zero phase shifts and inelasticity parameterizations of data coming from the rescattering processes pi pi ->pi pi, pi K ->pi K, and pi pi -> KK<overline>. The determination of the subtraction constants of the dispersive integrals relies on the leading contributions to the transition amplitudes from the 1/NC counting, where NC is the number of QCD colors. Furthermore, we use the measured values of the branching ratios to help in selecting the non-perturbative inputs in the isospin limit, from which we predict values for the CP asymmetries. We find that the predicted level of CP violation is much below the experimental value.
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