Anomalous mass dependence of glueball exclusive decay rates |
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Authors: | Bernard Pire John P Ralston |
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Institution: | Department of Physics, McGill University, Montreal, Canada |
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Abstract: | Exclusive decays such as G → ππ are studied in the framework ofperturbative QCD. We discuss the possibility of the constituent gluons' virtualness scaling as the glueball mass MG, which is a picture equivalent to a glueball containing a few slow-moving, heavy gluons. In this case, the decay rate exhibits a pinch singularity which enhances it by a factor of order (MG2/mq2)2 over the dimensional scaling expectation. This singularity is partially suppressed by Sudakov effects which reduce the enhancement factor to . |
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