χ<sub><i>c</i>1</sub> and χ<sub><i>c</i>2</sub> Resonance Parameters with the Decays χ<sub><i>c</i>1,<i>c</i>2</sub> → <i>J</i>/ψμ<SUP>+</SUP>μ<SUP>-</SUP>



Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S
et al (show 791 more authors) (2017) χ<sub><i>c</i>1</sub> and χ<sub><i>c</i>2</sub> Resonance Parameters with the Decays χ<sub><i>c</i>1,<i>c</i>2</sub> → <i>J</i>/ψμ<SUP>+</SUP>μ<SUP>-</SUP>. PHYSICAL REVIEW LETTERS, 119 (22).

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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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 12 Jan 2018 10:37
Last Modified: 10 Oct 2023 23:24
DOI: 10.1103/PhysRevLett.119.221801
Open Access URL: https://arxiv.org/pdf/1709.04247.pdf
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3015913