Two-pion transitions in quarkonium revisited

Journal Article · Fri Sep 01 04:00:00 EDT 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.74.054022· OSTI ID:20871110

Voloshin, M B ^[1]

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1. William I. Fine Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455 (United States) and Institute of Theoretical and Experimental Physics, Moscow, 117218 (Russian Federation)

Two-pion transitions in charmonium and bottomonium are considered with the leading relativistic effects taken into account. It is estimated that the contribution of the chromo-magnetic interaction of the charmed quarks to the amplitude of the decay {psi}(2S){yields}{pi}{pi}J/{psi} is at the level of (15-20)%. This contribution is enhanced by a factor of 3 in the decay {eta}{sub c}(2S){yields}{pi}{pi}{eta}{sub c}, producing a significant modification of the rate and the spectrum in the latter decay. It is also suggested that the peculiar observed spectrum in the decay {upsilon}(3S){yields}{pi}{pi}{upsilon} can be explained by a relative prominence of the relativistic terms, if the leading nonrelativistic quarkonium amplitude is dynamically suppressed. Also discussed are the effects of the final state interaction between the pions.

• OSTI ID: 20871110
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 74; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
C QUARKS
ENERGY SPECTRA
ETA C-3590 MESONS
FINAL-STATE INTERACTIONS
J PSI-3097 MESONS
PARTICLE DECAY
PIONS
PSI-3770 MESONS
RELATIVISTIC RANGE
UPSILON-10355 MESONS