Belle实验上强子型$e^{+}e^{-}$碰撞中双粒子关联的测量
高能物理 - 实验
2020-08-11 v1
摘要
具有大赝快度差和小方位角差的带电粒子对的增强，常被称为“脊信号(ridge signal)”，是在高多重数质子-质子、质子-离子和氘-离子碰撞中广泛观测到的现象，其机理尚未完全明了。在重离子碰撞中，夸克-胶子等离子体的流体动力学膨胀是脊信号起源的可能解释之一。在碰撞系统中进行测量，由于没有初态强子结构引入的复杂性，可作为检验脊信号形成的互补探针。本文报道了在 GeV的高多重数碰撞中双粒子角关联函数的首次测量。本研究使用Belle探测器在KEKB收集的强子型湮灭数据。双粒子角关联函数在全方位角和大赝快度区间内测量，这些区间由电子束轴或事件推力轴定义，并作为带电粒子多重数的函数。以主要出射夸克对确定参考轴的事件推力分析中的测量，对额外软胶子辐射区域敏感。两种坐标分析均未观测到显著脊信号。近侧喷注关联在推力轴分析中似乎不存在。测量结果与各类事件产生器的预言进行比较，预计将为低能区的唯象模型提供新的约束。
引用
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title = {Measurement of two-particle correlations in hadronic $e^{+}e^{-}$ collisions at Belle},
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journal= {arXiv preprint arXiv:2008.04187},
year = {2020}
}
备注
13 pages, 5 figures. Conference paper for ICHEP 2020