Two-photon widths of the χcJ states of charmonium

Journal article

Using a data sample of 24.5×106 ψ(2S) the reactions ψ(2S)→γχcJ, χcJ→γγ have been studied for the first time to determine the two-photon widths of the χcJ states of charmonium in their decay into two photons. The measured quantities are B(ψ(2S)→γχc0)×B(χc0→γγ)=(2. 17±0.32±0.10)×10-5 and B(ψ(2S)→γχc2) ×B(χc2→γγ)=(2.68±0.28±0.15)×10-5. Using values for B(ψ(2S)→γχc0,c2) and Γ(χc0,c2) from the literature the two-photon widths are derived to be Γγ γ(χc0)=(2.36±0.35±0.22)keV, Γγγ(χ c2)=(0.66±0.07±0....

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Authors: Ecklund, K; Love, W; Savinov, V; Lopez, A; Mendez, H

• Journal: Physical Review D
• Volume: 78
• Issue: 9
• Publication date: 2008-11-18
• DOI: 10.1103/PhysRevD.78.091501
• EISSN: 1550-2368
• ISSN: 1550-7998
• Language: English