sPHENIX is a new experiment that is being constructed at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The primary physics goals of sPHENIX are to measure jets, their substructure, and the upsilon resonances in $p$$+$$p$, $p$+Au and Au+Au collisions. To realize these goals, a tracking system composed of a time projection chamber and several silicon detectors will be used to identify tracks that correspond to jets and upsilon decays. However, the sPHENIX experiment will collect approximately 200 PB of data utilizing a finite-sized computing center; thus, performing track reconstruction in a timely manner is a challenge due to the large occupancy of heavy-ion collisions. The sPHENIX experiment, its track reconstruction, and the need for implementing faster track -fitting algorithms, such as that provided by the A Common Tracking Software package, into the sPHENIX software stack are discussed.
Implementation of ACTS into sPHENIX track reconstruction
sPHENIX是布鲁克海文国家实验室(Brookhaven National Laboratory,BNL)的相对论重离子对撞机(Relativistic Heavy Ion Collider)正在建设的一个高能核物理实验。sPHENIX的主要物理目标是通过测量$p$ $+$ $p$、$p$ +Au和Au+Au碰撞中的喷流、它们的子结构和重味强子来研究夸克-胶子-等离子体以及质子和原子核的部分子结构。sPHENIX将在三个运行周期内收集大约300 PB的数据,并使用BNL的可用计算资源进行分析;因此,由于重离子碰撞事件的高占用率,及时执行轨道重建是一项挑战。sPHENIX实验最近实施了通用跟踪软件(Common Tracking Software,简称STO)轨道重建工具包,其目标是以高效率和在每个最小偏差事件5秒的计算预算内重建轨道。本文报告了作为sPHENIX中默认轨迹拟合工具的P2P的性能状态,包括P2P中首次实现时间投影室几何结构的讨论。
本文介绍了北京正负电子对撞机(BEPC Ⅱ)的现状和展望,BEPC Ⅱ的状态良好,最近达到了最高亮度7.08* 10^32 cm ^-2 s ^-1。自2009年以来,BESIII探测器一直稳定运行。其子探测器的升级计划已经提出,升级正在进行中。主要的升级来自漂移室和飞行时间计数器。其他子探测器状态良好,无需升级。考虑到BESIII探测器的现状和升级计划,预计BESIII能够工作8到10年。
Status and prospects of the NEXT experiment for neutrinoless double beta decay searches
NEXT(Neutrino Experiment with a Xenon TPC)是一个实验计划,其目标是在高压氙TPC中使用$^{136}$探测器,通过电致发光读出,发现无中微子双β衰变。在本文中,将报告NEXT-White探测器的结果,该探测器目前正在Canfranc Subterráneo(LSC)采集数据。还将简要讨论计划于2020年开始运行的NEXT-100装置的前景,以及将该技术扩展到充分探索中微子质量逆层次所需的大型和超低背景探测器的计划。