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$\chi_{c1}$ and $\chi_{c2}$ resonance parameters with the decays $\chi_{c1,c2} \to J/\psi\mu^+\mu^-$


LHCb Collaboration; Bernet, R; Müller, K; Serra, N; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2017). $\chi_{c1}$ and $\chi_{c2}$ resonance parameters with the decays $\chi_{c1,c2} \to J/\psi\mu^+\mu^-$. Physical Review Letters, 119(22):221801.

Abstract

The decays $\chi_{c1} \to J/\psi\mu^+\mu^-$ and $\chi_{c2} \to J/\psi\mu^+\mu^-$ 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
$m(\chi_{c1}) = 3510.71 \pm 0.04(stat) \pm 0.09(syst) MeV$ and
$m(\chi_{c2}) = 3556.10 \pm 0.06(stat) \pm 0.11(syst)  MeV$, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference $m(\chi_{c2}) − m(\chi_{c1}) = 45.39 \pm 0.07(stat) \pm 0.03(syst) MeV$. The natural width of the $\chi_{c2}$ meson is measured to be $\Gamma(\chi_{c2}) = 2.10 \pm 0.20(stat) \pm 0.02(syst) MeV$. These results are in good agreement with and have comparable precision to the current world averages.

Abstract

The decays $\chi_{c1} \to J/\psi\mu^+\mu^-$ and $\chi_{c2} \to J/\psi\mu^+\mu^-$ 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
$m(\chi_{c1}) = 3510.71 \pm 0.04(stat) \pm 0.09(syst) MeV$ and
$m(\chi_{c2}) = 3556.10 \pm 0.06(stat) \pm 0.11(syst)  MeV$, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference $m(\chi_{c2}) − m(\chi_{c1}) = 45.39 \pm 0.07(stat) \pm 0.03(syst) MeV$. The natural width of the $\chi_{c2}$ meson is measured to be $\Gamma(\chi_{c2}) = 2.10 \pm 0.20(stat) \pm 0.02(syst) MeV$. These results are in good agreement with and have comparable precision to the current world averages.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:26 Jan 2018 14:42
Last Modified:19 Feb 2018 10:43
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Publisher DOI:https://doi.org/10.1103/PhysRevLett.119.221801

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