标题： 下一代LHC重离子实验 显示英文标题

标题： A next-generation LHC heavy-ion experiment

摘要： 本文档讨论了在LHC上建造一种紧凑的下一代多功能探测器的计划，作为当前ALICE实验的后续方案。 目标是建造一个几乎无质量的圆柱形主探测器，由基于MAPS技术的弯曲晶圆级超薄硅传感器构成的真正圆柱层组成，每层的材料预算达到前所未有的低水平0.05% X$_0$，最内层可能位于束流管道内部。 除了在宽动量范围内（低至几十MeV/$c$）具有优越的跟踪和顶点识别能力外，探测器还将通过飞行时间测定实现粒子识别，分辨率为约20~ps。 此外，电子和光子识别将在一个单独的簇射探测器中进行。 该提议的探测器旨在研究亮度比升级后的ALICE探测器所能达到的高20到50倍的pp、pA和AA碰撞，从而能够进行丰富的物理研究项目，从超低横向动量下的电磁探针测量到奇夸克和底夸克领域的精密物理研究。 显示英文摘要

摘要： The present document discusses plans for a compact, next-generation multi-purpose detector at the LHC as a follow-up to the present ALICE experiment. The aim is to build a nearly massless barrel detector consisting of truly cylindrical layers based on curved wafer-scale ultra-thin silicon sensors with MAPS technology, featuring an unprecedented low material budget of 0.05% X$_0$ per layer, with the innermost layers possibly positioned inside the beam pipe. In addition to superior tracking and vertexing capabilities over a wide momentum range down to a few tens of MeV/$c$, the detector will provide particle identification via time-of-flight determination with about 20~ps resolution. In addition, electron and photon identification will be performed in a separate shower detector. The proposed detector is conceived for studies of pp, pA and AA collisions at luminosities a factor of 20 to 50 times higher than possible with the upgraded ALICE detector, enabling a rich physics program ranging from measurements with electromagnetic probes at ultra-low transverse momenta to precision physics in the charm and beauty sector.