论文标题
低能量抗抗耐酸横截面的测量
Measurement of the low-energy antideuteron inelastic cross section
论文作者
论文摘要
在这封信中，我们报告了低粒子动量抗抑郁核相互作用的非弹性横截面的首次测量，覆盖了$ 0.3 \ leq p <4 $ gev/$ c $的范围。该测量是使用P-PB碰撞进行的，每核中心的能量每核核心对$ \ sqrt {s _ {\ rm {nn}} $ = 5.02 tev记录，并在Cern LHC上与爱丽丝探测器一起记录，并利用探测器的材料作为吸收器和蚂蚁替代物。将提取的原始反对粒子与颗粒比的比率与基于Geant4工具包的详细爱丽丝模拟的结果进行了比较，以通过检测器材料传播抗颗粒。对原始（抗）质子光谱的分析是这项研究的基准，因为它们的望态相互作用横截面在实验上受到了良好的约束。在爱丽丝探测器材料上平均具有原子质量质量$ \ langle a \ rangle $ = 17.4和31.8，对抗抑郁核相互作用的非弹性横截面进行了第一次测量。测得的非弹性横截面指向GEANT4中使用的Glauber模型参数化的可能过量，最低动量间隔为$ 0.3 \ leq P <0.47 $ GEV/$ C $，最高为2.1。该结果与理解反物质的繁殖以及对星际介质内宇宙射线相互作用对反核生产的贡献有关。此外，该测量所涵盖的动量范围对于评估间接暗搜索的信号预测至关重要。
In this Letter, we report the first measurement of the inelastic cross section for antideuteron-nucleus interactions at low particle momenta, covering a range of $0.3 \leq p < 4$ GeV/$c$. The measurement is carried out using p-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV, recorded with the ALICE detector at the CERN LHC and utilizing the detector material as an absorber for antideuterons and antiprotons. The extracted raw primary antiparticle-to-particle ratios are compared to the results from detailed ALICE simulations based on the GEANT4 toolkit for the propagation of antiparticles through the detector material. The analysis of the raw primary (anti)proton spectra serves as a benchmark for this study, since their hadronic interaction cross sections are well constrained experimentally. The first measurement of the inelastic cross section for antideuteron-nucleus interactions averaged over the ALICE detector material with atomic mass numbers $\langle A \rangle$ = 17.4 and 31.8 is obtained. The measured inelastic cross section points to a possible excess with respect to the Glauber model parameterization used in GEANT4 in the lowest momentum interval of $0.3 \leq p < 0.47$ GeV/$c$ up to a factor 2.1. This result is relevant for the understanding of antimatter propagation and the contributions to antinuclei production from cosmic ray interactions within the interstellar medium. In addition, the momentum range covered by this measurement is of particular importance to evaluate signal predictions for indirect dark-matter searches.
