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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/132657
χc1 and χc2 Resonance Parameters with the Decays χc1,c2→J/ψμ+μ−
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The decays χc 1→J /ψ μ+μ- and χc 2→J /ψ μ+μ- are observed and used to study the resonance parameters of the χc 1 and χc 2 mesons. The masses of these states are measured to be m (χc 1)=3510.71 ±0.04 (stat ) ±0.09 (syst ) MeV and m (χc 2)=3556.10 ±0.06 (stat ) ±0.11 (syst ) MeV , where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference m (χc 2)-m (χc 1)=45.39 ±0.07 (stat ) ±0.03 (syst ) MeV . The natural width of the χc 2 meson is measured to be Γ (χc 2)=2.10 ±0.20 (stat ) ±0.02 (syst ) MeV . These results are in good agreement with and have comparable precision to the current world averages.
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ALFONSO ALBERO, Alejandro, et al. χc1 and χc2 Resonance Parameters with the Decays χc1,c2→J/ψμ+μ−. Physical Review Letters. 2017. Vol. 119, num. 22, pags. 221801. ISSN 0031-9007. [consulted: 6 of June of 2026]. Available at: https://hdl.handle.net/2445/132657