@Article{LHCbCollaborationAaij_etal2017,
author="LHCb Collaboration (Aaij, R. et al
and Garcia Martin, L. M.
and Henry, L.
and Martinez-Vidal, F.
and Oyanguren, A.
and Remon Alepuz, C.
and Ruiz Valls, P.
and Ruiz Vidal, J.
and Sanchez Mayordomo, C.",
title="chi(c1) and chi(c2) Resonance Parameters with the Decays chi(c1,c2) -> J/psi mu(+)mu(-)",
journal="Physical Review Letters",
year="2017",
publisher="Amer Physical Soc",
volume="119",
number="22",
pages="221801--9pp",
abstract="The decays chi(c1) -> J/psi mu(+)mu(-) and chi(c1) -> J/psi mu(+)mu(-) are observed and used to study the resonance parameters of the chi(c1) and chi(c2) mesons. The masses of these states are measured to be m(chi(c1)) = 3510.71 +/- 0.04(stat) +/- 0.09(syst) MeV and m(chi(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(chi(c2)) -- m(chi(c1)) = 45.39 +/- 0.07(stat) +/- 0.03(syst) MeV. The natural width of the chi(c2) meson is measured to be Gamma(chi(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.",
optnote="WOS:000416317900008",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3389), last updated on Wed, 13 Dec 2017 20:03:57 +0000",
issn="0031-9007",
doi="10.1103/PhysRevLett.119.221801",
opturl="http://arxiv.org/abs/1709.04247",
opturl="https://doi.org/10.1103/PhysRevLett.119.221801",
archivePrefix="arXiv",
eprint="1709.04247",
language="English"
}