Search for the 0-- glueball in Υ(1S) and Υ(2S) decays

Le résumé fourni par la source

We report the first search for the J PC ¼ 0 --glueball in ϒð1SÞ and ϒð2SÞ decays with data samples of ð102 Æ 2Þ × 10 6 and ð158 Æ 4Þ × 10 6 events, respectively, collected with the Belle detector.No significant signals are observed in any of the proposed production modes, and the 90% credibility level upper limits on their branching fractions in ϒð1SÞ and ϒð2SÞ decays are obtained.The inclusive branching fractions of the ϒð1SÞ and ϒð2SÞ decays into final states with a χ c1 are measured to be Bðϒð1SÞ → χ c1 þ anythingÞ ¼ ð1.90 Æ 0.43ðstatÞ Æ 0.14ðsystÞÞ × 10 -4 with an improved precision over prior measurements and Bðϒð2SÞ → χ c1 þ anythingÞ ¼ ð2.24 Æ 0.44ðstatÞ Æ 0.20ðsystÞÞ × 10 -4 for the first time.

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