GLISSANDO 3: GLauber Initial-State Simulation AND mOre, ver. 3

We present ver. 3 of GLISSANDO, a versatile Monte-Carlo generator for Glauber-like models of the initial stages of ultra-relativistic heavy-ion collisions. The present version incorporates the wounded parton model, which is phenomenologically successful in reproducing multiplicities of particle production at the RHIC and the LHC. Within this model, one can study the nucleon substructure fluctuation effects, recently explored in p-A collisions. In addition, the code includes the possibility of investigating collisions of light nuclei, such as 3He and 3H, or the alpha-clustered 7,9Be, 12C, and 16O, where the deformation of the intrinsic wave function influences the transverse shape of the initial state. The current version, being down-compatible, retains the functionality of the previous releases, such as incorporation of various variants of Glauber-like models, a smooth NN inelasticity profile in the impact parameter obtained from a parametrization of experimental data, fluctuating strength of the entropy deposition, or realistic nuclear distributions of heavy nuclei with deformation. The code can provide output in the format containing the event-by-event source location, which may be further used in modeling the intermediate evolution phase, e.g., with hydrodynamics or transport models. The interface is simplified, such that in the control input file the user may supply only the very basic information, such as the collision energy, the mass numbers of the colliding nuclei, and the model type. GLISSANDO 3 is integrated with the CERN ROOT platform. The package includes numerous illustrative and useful ROOT scripts to compute and plot various results.

本报告呈现GLISSANDO版本3，一种适用于研究超相对论重离子碰撞初期阶段的Glauber类模型的通用蒙特卡罗生成器。本版集成了损伤部分子模型，该模型在重现RHIC和LHC中粒子产生多重性方面具有现象学上的成功。在此模型框架内，可研究核子子结构波动效应，此效应近期在质子-核碰撞中得到了探讨。此外，代码还具备研究轻核碰撞的可能性，如³He和³H，或α簇状核7,9Be、12C和16O的碰撞，其中内在波函数的形变影响了初始状态的横截面形状。当前版本向下兼容，保留了先前版本的功能，例如集成多种Glauber类模型、基于实验数据参数化得到的质心截距处的光滑非弹性散射谱、熵沉积强度的波动性，或具有形变的重核的核分布。代码能够提供包含事件源位置的事件格式输出，这些信息可以进一步用于模拟中间演化阶段，例如与流体动力学或输运模型相结合。用户界面得到简化，在控制输入文件中，用户仅需提供最基本的信息，如碰撞能量、碰撞核的质量数以及模型类型。GLISSANDO 3已集成于CERN的ROOT平台。该套件包括大量说明性和实用性的ROOT脚本，用于计算和绘制各种结果。