How Large Is the $\eta - \eta^\prime$ Mixing Angle?

Grunberg, G.

doi:10.1016/0370-2693(86)91476-0

How Large Is the $\eta - \eta^\prime$ Mixing Angle?

G. Grunberg
(
- Ecole Polytechnique
)

Feb, 1986

4 pages

Published in:

Phys.Lett.B 168 (1986) 141-144

Published: 1986

DOI:

10.1016/0370-2693(86)91476-0

Report number:

Print-86-0168 (ECOLE POLYTECHNIQUE)

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Abstract: (Elsevier)

New experimental results on Γ ( η → γγ ) seem to require a large η-η′ mixing angle Θ. Using anomalous Ward identities and 1/ N arguments, we show that0 Θ > 16°, and that values of Θ as large as 28° are theoretically admissible, and in reasonable agreement with the new data. A satisfactory prediction for Γ ( J / ψ → η ′ γ ) is also obtained in the range 16° < Θ < 25°.

ETA: ELECTROMAGNETIC DECAY
ELECTROMAGNETIC DECAY: ETA
ETA(958): ELECTROMAGNETIC DECAY
ELECTROMAGNETIC DECAY: ETA(958)
ETA: WIDTH
ETA(958): WIDTH
MIXING ANGLE: (ETA(958) ETA)
EXPANSION 1/N
FIELD THEORY: WARD IDENTITY
J/PSI(3100): RADIATIVE DECAY