Hadronic transitions from UPSILON(3S) to the 1/sup 1/P/sub 1/ level of bottomonium
Within the framework of the multipole expansion in QCD it is shown that the transition from the UPSILON(3S) resonance to the spin-singlet level of bottomonium with emission of two pions, UPSILON(3S)..-->..1/sup 1/P/sub 1/..pi pi.., is suppressed by two orders of magnitude in comparison with the parton estimate used earlier, and must have a relative probability of less than 10/sup -4/. The isospin-violating single-pion transition UPSILON(3S)..-->..1/sup 1/P/sub 1/..pi../sup 0/ has an order of magnitude greater probability than the two-pion one, and can be of order 10/sup -3/ of the width of the UPSILON(3S) resonance. The reason for the small probability of the two-pion transition in question is that the anomaly in the trace of the energy-momentum tensor, which determines the width of decays of the type UPSILON'..-->..UPSILON..pi pi.., does not contribute to it.
- Research Organization:
- Institute of Theoretical and Experimental Physics of the State Atomic Energy Commission
- OSTI ID:
- 6982717
- Journal Information:
- Sov. J. Nucl. Phys. (Engl. Transl.); (United States), Vol. 43:6
- Country of Publication:
- United States
- Language:
- English
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645204* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties