The enhancement of the decay υ (1D) → ηυ (1S) by the axial anomaly in QCD

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Abstract

It is shown that the rates of the decays Υ (13D1) → νΥ (1S) and Υ (13D2) → ηΥ (1S) should be comparable to and likely exceed that of the recently discussed in the literature two-pion transition Υ (1D) → ππΥ (1S). The reason for this behavior is that the discussed η transitions are enhanced by the contribution of the anomaly in the flavor singlet axial current in QCD.

Original languageEnglish (US)
Pages (from-to)68-74
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume562
Issue number1-2
DOIs
StatePublished - Jun 5 2003

Bibliographical note

Funding Information:
I gratefully acknowledge enlightening conversations with Arkady Vainshtein. This work is supported in part by the DOE grant DE-FG02-94ER40823.

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