Production from hadrons Sample Clauses

Production from hadrons. The main channels of HNL production from hadrons are via decays of sufficiently long-lived hadrons, i.e. the lightest hadrons of each flavor1. In the framework of the Fermi theory, the decays are inferred by the weak charged currents. One can also investigate the production through neutral current from the hidden flavored mesons J/ψ(cc¯, 3097), Υ(b¯b, 9460) as sources of HNLs. These mesons are short-lived, but 1.5–2 times heavier than the corresponding open flavored mesons, giving a chance to produce heavier HNLs. Since the region of HNL masses below that of the kaon is strongly constrained by previous experiments (see [110] for details, reproduced in Fig. 3.1), we concentrate on the production channels for HNL masses MN > 0.5GeV. 1Such hadrons decay only through weak interactions with relatively small decay width (as com- pared to electromagnetic or strong interaction). As the probability of HNL production from the hadron’s decay is inversely proportional to the hadron’s decay width, the HNL production from the lightest hadrons is significantly more efficient. U¯ h, p D l, k W N, k′ h′, p′ h, p D U l, k W N, k′ Figure 3.2: Left: The diagram of leptonic decay of the meson h with 4-momentum