The standard model and Quantum Chromodynamics (QCD) have undergone rigorous tests at distances much shorter than the size of a nucleon. Up to now, the predicted phenomena are reproduced rather well. However, at distances comparable to the size of a nucleon, new experimental results keep appearing which cannot be described consistently by effective theories based on QCD. The physics of strange and charmed quarks holds the potential to connect the two energy domains, interpolating between the limiting scales of QCD. This is the regime which will be explored using the future Antiproton Annihilations at Darmstadt (PANDA) experiment at the Facility for Antiproton and Ion Research (FAIR).
In this contribution some of the most relevant physics topics are detailed; and the reason why PANDA is the ideal detector to study them is given. Precision studies of hadron formation in the charmonium region will greatly advance our understanding of hadronic structure. It may reveal particles beyond the two and three-quark configuration, some of which are predicted to have exotic quantum numbers in that mass region. It will deepen the understanding of the charmonium spectrum, where unpredicted states have been found recently by the B-factories. To date the structure of the nucleon, in terms of parton distributions, has been mainly investigated using scattering experiments. Complementary information will be acquired measuring electro-magnetic final states at PANDA.
Novel physics opportunities at the HESR-Collider with PANDA at FAIR
在欧洲反质子和离子研究设施(FAIR)的重新定义的$\bar{\text{p}} \text{p}(A)$对撞机模式HESR-C中,高能储存环上的PANDA探测器面临着令人兴奋的新的科学机会。高亮度,$L \sim 10^{31}$ cm $^{-2}$ s $^{-1}$,以及宽范围的中高能,$\sqrt{s_{\text{NN}}}$高达30 GeV的$\bar{\text{p}} \text{p}(A)$碰撞将允许探索QCD中广泛的令人兴奋的主题,包括研究激发的开放魅力和底态,包含重(反)夸克的核束缚态的产生,双轻子产生中硬和软物理的相互作用,以及探索胶子--而不是夸克--经历强相互作用的机制。
Perspectives of Open Charm Physics at $\bar PANDA$
位于德国达姆施塔特的FAIR(反质子和离子研究设施)的$\bar PANDA$实验是为$\bar p p$湮灭研究而设计的,它将研究反质子与核子和原子核相互作用中的强子和核物理的基本问题。胶子激发和强子与奇异夸克和粲夸克的物理学将以前所未有的准确度被访问,从而允许高精度测试强相互作用。特别是,$D_{s0}^*(2317)^+$和$D_{s1}(2460)^+$在发现11年后仍然受到高度关注,因为它们不能简单地用潜在的模型来理解。现有的统计数据和过去实验的分辨率无法澄清其性质。最近,欧洲核子研究中心的LHCb在这方面取得了进展,但仍然没有达到澄清$cs$光谱之谜所需的精度水平。$\bar PANDA$将能够实现比B工厂高20倍的质量分辨率,预计这将对这些和二阶开放问题起决定性作用。将介绍从$D_s$介子的横截面的激发函数评估宽度的技术,并将显示正在进行的模拟与$PandaRoot$。
Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR
在PandaRoot软件框架内的\PANDA(FAIR)的电磁质子形状因子的未来测量的模拟结果的报告。估计了质子形状因子的统计精度。信号通道$\bar p p \to e^+ e^-$是在两个不同但一致的过程的基础上研究的。研究了主背景通道$\textit{i.e.}$ $\bar p p \to π^+ π^-$的抑制。此外,背景与信号效率,统计和系统的不确定性上提取的质子形状因子使用两种不同的程序进行评估。结果是一致的,与以前的模拟研究,使用一个旧的,简化的框架。然而,在PandaRoot研究中,假设标称光束条件和探测器性能,在大范围的动量传递中实现了稍好的精度。
GSI Helmholtzzentrum für Schwerionenforschung(GSI亥姆霍兹重离子研究中心);Ruhr University Bochum(波鸿鲁尔大学);Institut für Kernphysik, Goethe-Universität Frankfurt(法兰克福歌德大学核物理研究所);Helmholtz Research Academy Hesse for FAIR (HFHF)(黑森FAIR亥姆霍兹研究院);Thomas Jefferson National Accelerator Facility (JLab)(托马斯·杰斐逊国家加速器设施(杰夫逊实验室));SUBATECH–Université de Nantes–IMT Atlantique–CNRS/IN2P3(南特大学-大西洋高等矿业学院-CNRS/IN2P3 SUBATECH联合实验室);Frankfurt Institute for Advanced Studies (FIAS)(法兰克福高级研究学院);Instituto de Física Corpuscular (IFIC), CSIC–Universitat de València(瓦伦西亚大学-CSIC粒子物理研究所);School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University(北京大学物理学院核物理与技术国家重点实验室);High Energy Accelerator Research Organization (KEK)(高能加速器研究机构(KEK));Stockholm University(斯德哥尔摩大学);School of Physics Engineering and Technology, University of York(约克大学物理工程与技术学院);CERN(欧洲核子研究中心);Variable Energy Cyclotron Centre (VECC)(变能回旋加速器中心)
University of California San Diego(加利福尼亚大学圣迭戈分校);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Argonne National Laboratory(阿贡国家实验室);The University of Chicago(芝加哥大学);Massachusetts Institute of Technology(麻省理工学院);Halıcıoğlu Data Science Institute(哈勒哲奥卢数据科学研究所)