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Precise measurement of spin-averaged chi_{cJ}(1P) mass using photon conversions in psi(2S) -> gamma chi_{cJ}
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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.
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Cited by 1 Pith paper
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Discovery potential of charmonium $2P$ states through the $e^+e^- \to \gamma D\bar{D}$ processes
Using the measured e+e- -> gamma X(3872) cross section as a reference, the authors predict measurable e+e- -> gamma chi_c0(2P) and e+e- -> gamma chi_c2(2P) production and propose the gamma D Dbar final state as a sear...
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