| First study of eta(c)(1S), eta(1760) and X(1835) production via eta 'pi(+)pi(-) final states in two-photon collisions |
| Belle Collaboration
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| 2012
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发表期刊 | PHYSICAL REVIEW D
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卷号 | 86期号:5 |
通讯作者 | Zhang, CC (reprint author), SB RAS, Budker Inst Nucl Phys, Novosibirsk 630090, Russia.
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摘要 | The invariant mass spectrum of the eta 'pi(+)pi(-) final state produced in two-photon collisions is obtained using a 673 fb(-1) data sample collected in the vicinity of the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe a clear signal of the eta(c)(1S) and measure its mass and width to be Md(eta(c)(1S)) = (2982.7 +/- 1.8(stat) +/- 2.2(syst) +/- 0.3(model)) MeV/c(2) and Gamma(eta(c)(1S)) = (37.8(-5.3)(+5.8)(stat) +/- 2.8(syst) +/- 1.4(model)) MeV/c(2). The third error is an uncertainty due to possible interference between the eta(c)(1S) and a nonresonant component. We also report the first evidence for eta(1760) decay to eta'pi(+)pi(-); we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and eta(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product Gamma B-gamma gamma(eta'pi(+)pi(-)) for the X(1835). |
关键词 | DECAY
BARYONIUM
THRESHOLD
BELLE
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学科领域 | Astronomy & Astrophysics; Physics
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DOI | 10.1103/PhysRevD.86.052002
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收录类别 | SCI
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语种 | 英语
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WOS类目 | Astronomy & Astrophysics
; Physics, Particles & Fields
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WOS记录号 | WOS:000308530000001
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引用统计 |
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文献类型 | 期刊论文
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条目标识符 | http://ir.ihep.ac.cn/handle/311005/213326
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专题 | 实验物理中心
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作者单位 | 中国科学院高能物理研究所
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推荐引用方式 GB/T 7714 |
Belle Collaboration. First study of eta(c)(1S), eta(1760) and X(1835) production via eta 'pi(+)pi(-) final states in two-photon collisions[J]. PHYSICAL REVIEW D,2012,86(5).
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APA |
Belle Collaboration.(2012).First study of eta(c)(1S), eta(1760) and X(1835) production via eta 'pi(+)pi(-) final states in two-photon collisions.PHYSICAL REVIEW D,86(5).
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MLA |
Belle Collaboration."First study of eta(c)(1S), eta(1760) and X(1835) production via eta 'pi(+)pi(-) final states in two-photon collisions".PHYSICAL REVIEW D 86.5(2012).
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