Observation of the ηb(2S) Meson in Y(2S) → γηb(2S), ηb(2S) → Hadrons and Confirmation of the ηb(1S) Meson

被引：28
|
作者：
Dobbs, S. [1 ]
Metreveli, Z. [1 ]
Tomaradze, A. [1 ]
Xiao, T. [1 ]
Seth, Kamal K. [1 ]
机构：
[1] Northwestern Univ, Evanston, IL 60208 USA
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.109.082001
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The data for 9.3 million Y(2S) and 20.9 million Y(1S) taken with the CLEO III detector have been used to study the radiative population of states identified by their decay into 26 different exclusive hadronic final states. In the Y(2S) decays, an enhancement is observed at a similar to 5 sigma level at a mass of 9974.6 +/- 2.3(stat) +/- 2.1(syst) MeV. It is attributed to eta(b)(2S) and corresponds to the Y(2S) hyperfine splitting of 48.7 +/- 2.3(stat) +/- 2.1(syst) MeV. In the Y(1S) decays, the identification of eta(b)(1S) is confirmed at a similar to 3 sigma level with Minverted right perpendicular eta(b)(1S)inverted light perpendicular in agreement with its known value.
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