Precise measurement of spin-averaged chi_{cJ}(1P) mass using photon conversions in psi(2S) -> gamma chi_{cJ}

Abstract

Using photon conversions to e^+e^- pairs, the energy spectrum of inclusive photons from psi(2S) radiative decays is measured by BESII at the Beijing Electron-Positron Collider. The chi_{cJ}(1P) states (J=0,1,2) are clearly observed with energy resolution between 2.3 to 3.8 MeV, and their masses and the spin-averaged chi_{cJ} mass are determined to be M_{chi_{c0}}=3414.21\pm 0.39 \pm 0.27, M_{chi_{c1}}=3510.30\pm 0.14\pm 0.16, M_{chi_{c2}}=3555.70\pm 0.59 \pm 0.39 and M(^3P_{cog})=3524.85\pm 0.32 \pm 0.30 MeV/c^2.

7 pages, 4 figures (one of them contain 3 sub-figtures). More descriptions on the fitting procedure are added. Additional figures, including the MC energy resolution distribution and pi0 mass distributions, are added

References in corpus (15)

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• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Study of the B- --> J/psi K- pi+ pi- Decay and Measurement of the B- --> X(3872) K- Branching Fraction
• Properties of heavy quarkonia and B_c mesons in the relativistic quark model
• Complete O(v^2) corrections to the static interquark potential from SU(3) gauge theory
• Observation of the eta_c(2S) in exclusive B-->K KsK-pi+ decays
• Production of singlet P-wave $c\bar{c}$ and $b\bar{b}$ states
• New precision measurement of the $J/\psi$- and ${\psi }^{\prime }$ -meson masses
• Quark-antiquark potential with retardation and radiative contributions and the heavy quarkonium mass spectra
• Photon Transitions in ψ(2S) Decays to χ_{cJ}(1P) and η_c(1S)
• A Measurement of Psi(2S) Resonance Parameters
• Measurement of Ds+ and Ds*+ Production in B Meson Decays and from Continuum e+e- Annihilation at sqrt{s}=10.6 GeV
• High Precision Mass Measurements in $\Psi$ and ${\rm Y}$ Families Revisited
• Interference Study of the chi_c0 (1^3P_0) in the Reaction Proton-Antiproton -> pi^0 pi^0

Cited by in corpus (13)

• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Quarkonia and their transitions
• Annihilation Rate of Heavy $0^{-+}$ Quarkonium in Relativistic Salpeter Method
• Annihilation Rate of Heavy 0^{++} P-wave Quarkonium in Relativistic Salpeter Method
• Probing Dark force at BES-III/BEPCII
• ${\chi }_{c1}$ and ${\chi }_{c2}$ resonance parameters with the decays ${\chi }_{c1,c2}\to J/\psi {\mu }^{+}{\mu }^{-}$
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Anomalous radiative transitions
• Evidence for the Direct Two-Photon Transition from $\psi (3686)$ to $J/\psi$
• The discrete contribution to ${\psi }^{\prime }\to J/\psi +\gamma \gamma$
• Discovery potential of charmonium $2P$ states through the $e^{+}{e}^{-}\to \gamma D\bar{D}$ processes
• Study of charmonium production using decays to hadronic final states with the LHCb experiment
• Precise Measurement of the ${\chi }_{c0}$ Resonance Parameters and Branching Fractions of ${\chi }_{c0,c2}\to {\pi }^{+}{\pi }^{-}/K^{+}{K}^{-}$