Di-pion emission in heavy quarkonia decays |
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Authors: | Yu A Simonov |
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Institution: | (1) State Research Center Institute of Theoretical and Experimental Physics, Moscow, 117218, Russia |
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Abstract: | The dipion spectrum for the ϒ(nS) → ϒ(n′S) transition with n < 4 has the form dw/dq ∼ (phase space) |η − x|2, with x = q
2 − 4m
π2 / (ΔM)2 − 4m
π2 < q
2 ≡ M
ππ2, and ΔM = M(nS) − M(n′S). The parameter η is calculated and the spectrum is shown to reproduce the experimental data for all three types of decays:
3 → 1, 2 → 1, and 3 → 2 with η ≈ 0.5, 0, and −3, respectively.
The text was submitted by the author in English. |
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Keywords: | |
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