A search for the hadronic decays of the h c meson to the final states ppπ + π − π 0 , ppη, and ppπ 0 via the process ψ(3686) → π 0 h c is performed using (4.48 ± 0.03) × 10 8 ψ(3686) events collected with the BESIII detector. The decay channel h c → ppη is observed for the first time with a significance greater than 5σ and a branching fraction of (6.41 ± 1.74 ± 0.53 ± 1.00) × 10 −4 , where the uncertainties are statistical, systematic, and that from the branching fraction of ψ(3686) → π 0 h c . Strong evidence for the decay h c → ppπ + π − π 0 is found with a significance of 4.9σ and a branching fraction of (3.84 ± 0.83 ± 0.69 ± 0.58) × 10 −3 . The significances include systematic uncertainties. No clear signal of the decay h c → ppπ 0 is found, and an upper limit of 6.59 × 10 −4 on its branching fraction is set at the 90% confidence level.
Various supported Ir/TiO2 catalysts were prepared using different Ir precursors (i.e., H2IrCl6, (NH4)2IrCl6 and Ir(acac)3) and tested for vapor phase selective hydrogenation of crotonaldehyde. The choice of Ir precursor significantly altered the Ir-TiOx interaction in the catalyst, which thus had essential influences on the geometric and electronic properties of the Ir species, reducibility, and surface acidity, and, consequently, their reaction behaviors. The Ir/TiO2-N catalyst using (NH4)2IrCl6 as the precursor gave the highest initial reaction rates and turnover frequencies of crotyl alcohol formation. Such high performance was ascribed to the high Ir dispersion and high surface concentration of Ir0 species, as well as a higher surface acidity, in the Ir/TiO2-N catalyst compared to its counterparts, indicating the synergistic roles of the Ir-TiOx interface in the reaction, as the interfacial sites were responsible for the adsorption/activation of H2 and the C=O bond in the crotonaldehyde molecule.
The original article was published in Jan. 2023 (JHEP 01 (2023) 111), which the value of a ωππ µ = (2.213 ± 0.106 ± 0.149) × 10 −10 is not correct. It should be a ωππ µ = (0.135 ± 0.007 ± 0.009) × 10 −10 . The other parts of the paper are correct other than the a ωππ µ value to be modified. The corresponding preprint is arXiv:2208.04507v3.
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