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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
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: |
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| 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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