ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Results of the search for rare radiative decay modes of the ϕ-meson performed with the Neutral Detector at the VEPP-2M collider are presented. For the first time upper limits for the branching ratios of the following decay modes have been placed at 90% confidence level: $$\begin{gathered} B(\phi \to \eta '\gamma )〈 4 \cdot 10^{ - 4} , \hfill \\ B(\phi \to \pi ^0 \pi ^0 \gamma )〈 10^{ - 3} , \hfill \\ B(\phi \to f_0 (975)\gamma )〈 2 \cdot 10^{ - 3} , \hfill \\ B(\phi \to H\gamma )〈 3 \cdot 10^{ - 4} , \hfill \\ \end{gathered} $$ whereH is a scalar (Higgs) boson with a mass 600 MeV〈m H 〈1000 MeV, the real measurement isB(φ→H γ)·B(H→2π0)〈0.8·10-4, the quoted result is model dependent, as explained in the text, $$\begin{gathered} B(\phi \to a\gamma ) \cdot B(a \to e^ + e^ - )〈 5 \cdot 10^{ - 5} , \hfill \\ B(\phi \to a\gamma ) \cdot B(a \to \gamma \gamma )〈 2 \cdot 10^{ - 3} , \hfill \\ \end{gathered} $$ wherea is a particle with a low mass and a short lifetime, $$B(\phi \to a\gamma )〈 0.7 \cdot 10^{ - 5} ,$$ wherea is a particle with a low mass not observed in the detector.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01442062
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