Upsilon (1S)--> gamma +noninteracting particles.
Balest, Cho, Ford,Johnson, Lingel, Lohner, Rankin, Smith,Alexander, Bebek, Berkelman, Bloom, Browder, Cassel, Cho, Coffman, Crowcroft, Drell, Dumas, Ehrlich, Gaidarev, Galik, Garcia-Sciveres,Geiser, Gittelman,Gray, Hartill, Heltsley, Henderson,Jones, Kandaswamy, Katayama,Kim, Kreinick,Ludwig, Masui,Mevissen, Mistry, Ng, Nordberg, Patterson, Peterson, Riley, Salman,Sapper, Würthwein, Urish, Avery, Freyberger,Rodriguez, Yang, Yelton, Cinabro, Liu, Saulnier,Wilson,Yamamoto, Bergfeld, Eisenstein, Gollin, Ong, Palmer, Selen Physical review D: Particles and fields（1995）
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