摘要
We observe a narrow enhancement near [Formula presented] in the invariant mass spectrum of [Formula presented] pairs from radiative [Formula presented] decays. No similar structure is seen in [Formula presented] decays. The results are based on an analysis of a [Formula presented] event sample of [Formula presented] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an [Formula presented]- or [Formula presented]-wave Breit-Wigner resonance function. In the case of the [Formula presented]-wave fit, the peak mass is below [Formula presented] at [Formula presented] and the total width is [Formula presented] at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.
| 源语言 | 英语 |
|---|---|
| 期刊 | Physical Review Letters |
| 卷 | 91 |
| 期 | 2 |
| DOI | |
| 出版状态 | 已出版 - 10 7月 2003 |
| 已对外发布 | 是 |
指纹
探究 'Observation of a Near-Threshold Enhancement in the [Formula presented] Mass Spectrum from Radiative [Formula presented] Decays' 的科研主题。它们共同构成独一无二的指纹。引用此
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