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χ_{c1} and χ_{c2} resonance parameters with the decays χ_{c1,c2}→J/ψμ^{+}μ^{-}

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LHCb Collaboration (Including: Back, J. J., Blake, Thomas, Costa Sobral, Cayo, Crocombe, Andrew, Gershon, T. J., Kreps, Michal, Latham, Thomas, Loh, David, Mathad, Abhijit , Millard, E., O'Hanlon, Daniel P., Qian, W., Wallace, Charlotte and Wicht, Jean). (2017) χ_{c1} and χ_{c2} resonance parameters with the decays χ_{c1,c2}→J/ψμ^{+}μ^{-}. Physical Review Letters, 119 (22). 221801. doi:10.1103/PhysRevLett.119.221801 ISSN 0031-9007.

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Official URL: http://doi.org/10.1103/PhysRevLett.119.221801

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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.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
SWORD Depositor: Library Publications Router
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 1 December 2017
Dates:
DateEvent
1 December 2017Published
28 November 2017Available
Volume: 119
Number: 22
Article Number: 221801
DOI: 10.1103/PhysRevLett.119.221801
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)

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