Search for a light pseudoscalar particle in the decay K_{L};{0}-->pi;{0}pi;{0}X.
Phys Rev Lett
; 102(5): 051802, 2009 Feb 06.
Article
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| MEDLINE
| ID: mdl-19257503
ABSTRACT
We performed a search for a light pseudoscalar particle X in the decay K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/c;{2} was suggested by the HyperCP experiment. We found no evidence for X and set an upper limit on the product branching ratio for K_{L};{0}-->pi;{0}pi;{0}X, X-->gammagamma of 2.4x10;{-7} at the 90% confidence level. Upper limits on the branching ratios in the mass region of X from 194.3 to 219.3 MeV/c;{2} are also presented.
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Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2009
Tipo del documento:
Article
País de afiliación:
Taiwán