Search

The charmonium-like exotic states Y (4230) and the less known Y (4320) , produced in e + e − collisions, are sources of positive parity exotic hadrons in association with photons or pseudoscalar mesons. We analyze the radiative and pion decay channels in the compact tetraquark scheme, with a method that proves to work equally well in the most studied D ∗ → γ / π + D decays. The decay of the vector Y into a pion and a Z c state requires a flip of charge conjugation and isospin that is described appropriately in the formalism used. Rates are found to depend on the fifth power of pion momentum, which would make the final states π Z c (4020) strongly suppressed with respect to π Z c (3900) . The agreement with BES III data would be improved considering the π Z c (4020) events to be fed by the tail of the Y (4320) resonance under the Y (4230) . These results should renovate the interest in further clarifying the emerging experimental picture in this mass region. [ABSTRACT FROM AUTHOR]

We analyze constraints on the anomalous W t b couplings from B-physics experiments, performing a correlated analysis and allowing all anomalous couplings to differ simultaneously from their Standard Model (SM) values. The B-physics observables allow one to probe three linear combinations out of the four anomalous couplings, which parameterize the W t b vertex under the assumption that the SM symmetries remain the symmetries of the effective theory. The constraints in this work are obtained by taking into account the following B-physics observables: the B ¯ 0 − B 0 oscillations, the leptonic B → μ + μ − decays, the inclusive radiative B → X s γ decays, and the differential branching fractions in the semileptonic inclusive B → X s μ + μ − and exclusive B → (K , K *) μ + μ − decays at small q 2 , with q the momentum of the μ + μ − pair. We find that the SM values of the anomalous couplings belong to the 95% CL allowed region obtained this way, but lie beyond the 68% allowed region. We also report that the distributions of the anomalous couplings obtained within our scenario differ from the results of the 1D scenario, when only one of the couplings is allowed to deviate from its SM value. [ABSTRACT FROM AUTHOR]