Radiative Decays $W^\pm \to \rho^\pm \gamma$ and $Z^0 \to \rho^0 \gamma$

Arnellos, Lampros; Marciano, William J.; Parsa, Zohreh

doi:10.1016/0550-3213(82)90496-5

Radiative Decays $W^\pm \to \rho^\pm \gamma$ and $Z^0 \to \rho^0 \gamma$

Lampros Arnellos
(
- Northwestern U.
)
,
William J. Marciano
(
- Northwestern U.
)
,
Zohreh Parsa
(
- Northwestern U.
)

Aug, 1981

16 pages

Published in:

Nucl.Phys.B 196 (1982) 378-393

Published: 1982

DOI:

10.1016/0550-3213(82)90496-5

Report number:

PRINT-81-0619 (NORTHWESTERN)

reference search71 citations

Citations per year

Abstract: (Elsevier)

We present a general analysis of the intermediate vector boson decays W ± → P ± + γ and Z 0 → P 0 + γ (where P denotes any pseudoscalar meson). Strong interaction effects are parametrized by vector and axial-vector form factors which we estimate using quantum chromodynamics, bound-state analyses and triangle anomaly calculations. In the case of ordinary light pseudoscalars we find that these exclusive radiative decays are highly suppressed, e.g. Γ( W ± → π ± γ)/Γ( W − → μ ν μ ) ≅ 3 × 10 −8 and Γ( Z 0 → π 0 γ)/Γ( Z → μ μ ) ≅ 9 × 10 −10 . We also examine decays in which P is a very heavy bound-state meson or pseudo-Goldstone boson (such as a technion). For the latter case the suppression is much less; so those decays may be observable at very high luminosity accelerator such as ISABELLE and LEP.

POSTULATED PARTICLE: Z0
POSTULATED PARTICLE: W+
POSTULATED PARTICLE: W-
INTERMEDIATE BOSON: RADIATIVE DECAY
RADIATIVE DECAY: INTERMEDIATE BOSON
EFFECT: QUANTUM CHROMODYNAMICS
CURRENT: AXIAL-VECTOR
CURRENT: ANOMALY
CURRENT: VECTOR
INTERMEDIATE BOSON: BRANCHING RATIO

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Radiative Decays W±→ρ±γW^\pm \to \rho^\pm \gammaW±→ρ±γ and Z0→ρ0γZ^0 \to \rho^0 \gammaZ0→ρ0γ

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Radiative Decays $W^\pm \to \rho^\pm \gamma$ and $Z^0 \to \rho^0 \gamma$