标题： ITS3探测器和LS3 ALICE升级的物理范围 显示英文标题

标题： The ITS3 detector and physics reach of the LS3 ALICE Upgrade

摘要： 在大型强子对撞机（LHC）长期停机3（LS3）（2026-2028）期间，ALICE实验将用新的探测器——内跟踪系统3（Inner Tracking System 3）来替换其最内部的三层跟踪层。它将基于新开发的晶圆级单片有源像素传感器，这些传感器被弯曲成真正的圆柱层，并通过由碳泡沫制成的轻型机械结构固定到位。前所未有的低材料预算（每层）和接近相互作用点（19毫米）使得从非常低的$p_\text{T}$ (O(100MeV/$c$)) 的动量分辨率提高了两倍，例如，对于1 GeV/c的原始带电π介子，在横向和纵向方向上分别达到20 ${\mu}$m和15 ${\mu}$m。在2019-2023年的成功研发阶段之后，该创新探测器的可行性得到了证明，目前正开发最终的传感器和机械结构。本次报告将简要回顾概念设计和主要研发成果，以及当前的工作进展和完成与安装的路线。最后，它将展望改进的物理性能，特别是对于重味强子以及热介电子的性能，这些性能将随着新探测器的安装而实现。 显示英文摘要

摘要： During Large Hadron Collider (LHC) Long Shutdown 3 (LS3) (2026-28), the ALICE experiment is replacing its inner-most three tracking layers by a new detector, Inner Tracking System 3. It will be based on newly developed wafer-scale monolithic active pixel sensors, which are bent into truly cylindrical layers and held in place by light mechanics made from carbon foam. Unprecedented low values of material budget (per layer) and closeness to interaction point (19 mm) lead to a factor two improvement in pointing resolutions from very low $p_\text{T}$ (O(100MeV/$c$)), achieving, for example, 20 ${\mu}$m and 15 ${\mu}$m in the transversal and longitudinal directions, respectively, for 1 GeV/c primary charged pions. After a successful R\&D phase 2019-2023, which demonstrated the feasibility of this innovational detector, the final sensor and mechanics are being developed right now. This contribution will briefly review the conceptual design and the main R&D achievements, as well as the current activities and road to completion and installation. It concludes with a projection of the improved physics performance, in particular for heavy-flavour hadrons, as well as for thermal dielectrons, that will come into reach with this new detector installed.