期刊
PHYSICAL REVIEW LETTERS
卷 103, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.161801
关键词
-
资金
- DOE
- NSF (USA)
- NSERC (Canada)
- CEA
- CNRS-IN2P3 (France)
- BMBF
- DFG (Germany)
- INFN (Italy)
- FOM (The Netherlands)
- NFR (Norway)
- MES (Russia)
- MEC (Spain)
- STFC (United Kingdom)
- Marie Curie EIF (European Union)
- A. P. Sloan Foundation.
- Science and Technology Facilities Council [ST/H001166/1, ST/F008015/1, PP/E000444/1, ST/H000992/1] Funding Source: researchfish
- STFC [ST/F008015/1, ST/H000992/1, ST/H001166/1] Funding Source: UKRI
We have performed a search for the eta(b)(1S) meson in the radiative decay of the Y(2S) resonance using a sample of 91.6 x 10(6) Y(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at E-gamma = 609.3(-4.5)(+4.6)(stat) +/- 1.9(syst) MeV, corresponding to an eta(b)(1S) mass of 9394.2(-4.9)(+4.8)(stat) +/- 2.0(syst) MeV/c(2). The branching fraction for the decay Y(2S) --> gamma eta(b)(1S) is determined to be 3.9 +/- 1.1(stat)(-0.9)(+1.1)(syst)] x 10(-4). We find the ratio of branching fractions B[Y(2S) --> gamma eta(b)(1S)]/B[Y(3S) --> gamma eta(b)(1S)] = 0.82 +/- 0.24(stat)(-0.19)(+0.20)(syst).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据