Two-photon widths of the χc0,2 states and helicity analysis for χc2γγ

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American Physical Society

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Based on a data sample of 106×106 ψ events collected with the BESIII detector, the decays ψ′→γχc0,2,χc0,2γγ are studied to determine the two-photon widths of the χc0,2 states. The two-photon decay branching fractions are determined to be B(χc0,2γγ)=(2.24±0.19±0.12±0.08)×10−4 and B(χc0,2γγ)=(3.21±0.18±0.17±0.13)×10−4. From these, the two-photon widths are determined to be Γγγ(χc0)=(2.33±0.20±0.13±0.17) keV, Γγγ(χc2)=(0.63±0.04±0.04±0.04) keV, and R=Γγγ(χc2)/Γγγ(χc0)=0.271±0.029±0.013±0.027, where the uncertainties are statistical, systematic, and those from the PDG B(ψ′→γχc0,2 and Γ(χc0,2) errors, respectively. The ratio of the two-photon widths for helicity λ=0 and helicity λ=2 components in the decay χc2γγ is measured for the first time to be f0/2=Γγγλ=0(χc2)/Γγγλ=2(χc2)=0.00±0.02±0.02.

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Ablikim, M., Achasov, M. N., Ambrose, D. J., An, F. F., An, Q., An, Z. H., . . . Zuo, J. X. (2012). Two-photon widths of the χc0,2 states and helicity analysis for χc2γγ. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(11), 112008. http://dx.doi.org/10.1103/PhysRevD.85.112008

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© 2012 American Physical Society.

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