$\chi_{c1}$ and $\chi_{c2}$ Resonance Parameters with the Decays $\chi_{c1,c2}\to J/\psi\mu^+\mu^-$

Abstract : The decays χc1→J/ψμ+μ- and χc2→J/ψμ+μ- are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be m(χc1)=3510.71±0.04(stat)±0.09(syst)  MeV and m(χc2)=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(χc2)-m(χc1)=45.39±0.07(stat)±0.03(syst)  MeV. The natural width of the χc2 meson is measured to be Γ(χc2)=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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Journal articles

https://hal.archives-ouvertes.fr/hal-01669822
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Submitted on : Thursday, December 21, 2017 - 1:05:52 AM
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Citation

Roel Aaij, Bernardo Adeva, Marco Adinolfi, Ziad Ajaltouni, Simon Akar, et al.. $\chi_{c1}$ and $\chi_{c2}$ Resonance Parameters with the Decays $\chi_{c1,c2}\to J/\psi\mu^+\mu^-$. Phys.Rev.Lett., 2017, 119 (22), pp.221801. ⟨10.1103/PhysRevLett.119.221801⟩. ⟨hal-01669822⟩

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