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Updated: Jan 12, 2026

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Setting Limits on Supersymmetry Using Simplified Models
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观测一个新的魔法巴里翁衰变为X_{c}^{+}π^{-}π^{+}
R Aaij1, A S W Abdelmotteleb2, C Abellan Beteta3
1Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
Physical review letters
|October 31, 2025
概括
这项研究分析了来自13 TeV的质子对质子碰撞的X_{c}^{+}π^{-}π^{+}光谱,观察了四个显著的X_{c}^{+}状态. 新发现的X_{c}(2923) ^{+} baryons的精确测量改善了世界平均值.
科学领域:
- 粒子物理学 粒子物理学
- 子光谱学 子光谱学
- 量子色态动力学 量子色态动力学
背景情况:
- 该X_{c}^{+}π^{-}π^{+}光谱提供了对激发的魅力 baryons 状态的洞察.
- 了解这些状态对于测试子结构的理论模型至关重要.
研究的目的:
- 通过使用高亮度质子对质子碰撞数据,研究X_{c}^{+}π^{-}π^{+}光谱.
- 精确测量观察到的X_{c}^{+}状态的质量和宽度.
- 为了寻找新的X_{c}^{+} baryons共振.
主要方法:
- 对质子对质子碰撞数据的分析,质量中心能量为13 TeV.
- 利用了由LHCb实验 (2016-2018) 收集的5.4 fb-1的集成发光度.
- 进行了详细的光谱分析,以识别和描述 Ξ_{c}^{+} 状态.
主要成果:
- 观察到四个具有高统计意义的 Ξ_{c}^{+} 状态.
- 测量了X_{c}(2815) ^{+},X_{c}(2923) ^{+},X_{c}(2970) ^{+}和X_{c}(3080) ^{+}状态的精确质量和宽度值.
- 报告了第一个X_{c}(2923) ^{+} baryons的观测,与X_{c}(2923) ^{0}状态的同回旋伙伴一致.
结论:
- 这项研究显著提高了对几个 Ξ_{c}^{+} 状态的测量参数的精度.
- 发现X_{c}(2923) ^{+}提供了新的数据,以了解魅力 baryons 光谱学.
- 结果为完善粒子物理学理论模型提供了有价值的投入.
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