Abstract

In experiments with heavy-ion collisions produced particles or spectator nucleons and fragments can be used for determination of the initial collision geometry. This allows to experimentally group collisions into classes of initial geometry using a quantity called centrality. The Monte-Carlo Glauber model coupled with a negative binomial distribution, which models particles multiplicity, is typically used in experiments to map parameters of the collision geometry and centrality classes. In these proceedings we propose a similar procedure for centrality determination using projectile spectators instead of the produced particles multiplicity. The status of its implementation for the Compressed Baryonic Matter (CBM) experiment at FAIR is presented.

中文翻译：

---

利用 CBM 实验在重离子碰撞中使用弹丸观察器确定中心性

摘要

在重离子碰撞实验中，产生的粒子或旁观核子和碎片可用于确定初始碰撞几何形状。这允许使用称为中心性的量将碰撞实验性地分组为初始几何类别。Monte-Carlo Glauber 模型与负二项分布相结合，对粒子多重性进行建模，通常在实验中用于映射碰撞几何和中心性类的参数。在这些程序中，我们提出了一个类似的中心性确定程序，使用射弹观察者而不是产生的粒子多重性。介绍了 FAIR 压缩重子物质 (CBM) 实验的实施情况。