The decays χ_c1→J/ψμ^+μ^- and χ_c2→J/ψμ^+μ^- are observed and used to study the resonance parameters of the χ_c1 and χ_c2 mesons. The masses of these states are measured to be m(χ_c1)=3510.71±0.04(stat)±0.09(syst)  MeV and m(χ_c2)=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(χ_c2)-m(χ_c1)=45.39±0.07(stat)±0.03(syst)  MeV. The natural width of the χ_c2 meson is measured to be Γ(χ_c2)=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.

χ_c1 and χ_c2 Resonance Parameters with the Decays χ_c1,c2→J/ψμ^+μ^-

Veltri, M;
2017-01-01

Abstract

The decays χ_c1→J/ψμ^+μ^- and χ_c2→J/ψμ^+μ^- are observed and used to study the resonance parameters of the χ_c1 and χ_c2 mesons. The masses of these states are measured to be m(χ_c1)=3510.71±0.04(stat)±0.09(syst)  MeV and m(χ_c2)=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(χ_c2)-m(χ_c1)=45.39±0.07(stat)±0.03(syst)  MeV. The natural width of the χ_c2 meson is measured to be Γ(χ_c2)=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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/2666800
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 12
social impact