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- W2078280325 abstract "We calculate the rate for S∗→γγ and for δ0→γγ under the assumption that these hadrons are (KK)-molecules. We find that Λ(δ0(KK)→γγ)≈0.6 keV, which is larger than the Crystal Ball measurement by a factor of ∼. This is a disagreement of ≈ 2α given current experimental or estimated theoretical errors. In contrast, the assignment δ=qq predicts a rate for and JADE collaborations for Λ(S∗→γγ) are consistent with our prediction for Λ(S∗(KK)→γγ), but are a factor of ∼5 smaller than the quark model prediction for Λ(S∗(qq)→γγ). We also discuss important uncertainties in our estimate of Λ((KK)→γγ) specifically (1) the value of ‖ψKK(0)‖, (2) use of the Born approximation to estimate the as yet unmeasured α(K+K-→γγ) near threshold and (3) the possibility of large isospin violation effects in the S∗–δ0 system. Possible ways of improving on our approximations are successed." @default.
- W2078280325 created "2016-06-24" @default.
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- W2078280325 date "1985-12-01" @default.
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- W2078280325 title "Two-photon decays support the (K)-molecule picture of the S∗(975) and δ(980)" @default.
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- W2078280325 doi "https://doi.org/10.1016/0370-2693(85)91261-4" @default.
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