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Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
Nuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic.
Phys Rev Lett. 2020 Oct 16;125(16):162001. doi: 10.1103/PhysRevLett.125.162001.
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≤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_{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 (anti)particles 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 ⟨A⟩=17.4 and 31.8 is obtained. The measured inelastic cross section points to a possible excess with respect to the Glauber model parametrization used in geant4 in the lowest momentum interval of 0.3≤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.
在本信函中，我们报告了在低粒子动量下反氘核与原子核相互作用的非弹性截面的首次测量结果，动量范围为0.3≤p<4 GeV/c。该测量是利用质心能量为每核子 - 核子对sqrt[s_{NN}]=5.02 TeV的质子 - 铅碰撞进行的，由欧洲核子研究中心大型强子对撞机上的ALICE探测器记录，并利用探测器材料作为反氘核和反质子的吸收体。将提取的原始初级反粒子与粒子的比率与基于geant4工具包对（反）粒子在探测器材料中传播进行详细ALICE模拟的结果进行比较。对原始初级（反）质子谱的分析作为本研究的基准，因为它们的强子相互作用截面在实验上受到很好的限制。获得了在ALICE探测器材料上平均原子质量数⟨A⟩ = 17.4和31.8的反氘核与原子核相互作用的非弹性截面首次测量结果。测量的非弹性截面表明，在最低动量区间0.3≤p<0.47 GeV/c内，相对于geant4中使用的格拉肖模型参数化可能存在高达2.1倍的过量。这一结果对于理解反物质传播以及星际介质中宇宙射线相互作用对反原子核产生的贡献具有重要意义。此外，该测量覆盖的动量范围对于评估间接暗物质搜索的信号预测尤为重要。
