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An anomaly observed in the 8Be nuclear transition by the Atomki collaboration hints at a light, neutral boson decaying into an e + e − pair with a mass of about 17 MeV. In this paper, we study the Atomki anomaly in the framework of axial (ABJ) anomaly. Some theoretical results indicate that the X17 particle is the color singlet pseudoscalar. We take the X17 particle as a pseudoscalar meson (u ū) system which has the axial (ABJ) anomaly, where u denotes the up quark. Besides this, we also give an interpretation for E38 particle with a mass of about 38 MeV as a pseudoscalar meson (d d ̄) system. We obtain the correct masses of the two pseudoscalars by a non-perturbative mass formula. [ABSTRACT FROM AUTHOR]

Recently, some small hints of lepton flavor violating (LFV) decays have been probed in different colliders and accelerators. Although these processes are forbidden in the Standard Model (SM), observation of LFV decays are considered as good probes to test theory beyond the SM. In this paper, we study some LFV decays, e.g. three-body decay channels of μ lepton like μ → 3 e , μ → e ν ν ̄ and two-body decays of B meson and τ lepton like B s , d → μ ± e ∓ and τ → e ϕ in Z ′ model. We calculate the branching ratio of the above decays considering the effect of both Z and Z ′ -mediated flavor-changing neutral-current (FCNC). [ABSTRACT FROM AUTHOR]

Meson-baryon potentials are proposed as an extension of baryon-baryon one-boson-exchange potentials. All coupling constants satisfy the SU(3) symmetry and all mesons and baryons are assumed to have physical masses and widths and to behave as gaussian sources of meson fields. Assuming the parameters determined so as to reproduce the πN and K N scattering, our model inevitably predicts a strongly attractive S-wave $\bar K N$ interaction both in isospin 0 and 1 states. [ABSTRACT FROM AUTHOR]

It is shown that the difference between the magnetic moment results in the quark model with null instantons and semibosonized Nambu–Jona-Lasinio model lies in the symmetry properties of the meson cloud contributions. [ABSTRACT FROM AUTHOR]