论文标题
使用新的聚结模型重新访问宇宙射线反核磁通
Revisiting cosmic ray antinuclei fluxes with a new coalescence model
论文作者
论文摘要
由于预期的天体物理背景较低，因此已提出了抗tideuteron和抗细胞核作为暗物质的有前途的检测通道。为了估计潜在的外来贡献及其背景，通常在动量空间中采用合并模型。在这里，我们基于产生的核状态的Wigner函数表示新开发的合并模型。这种方法既包括抗核里的形成区域的过程依赖性大小，也包括半古典图片中合并抗核物的动量相关性。该模型包含一个单一的通用参数$σ$，我们调整了有关电子峰，质子 - 蛋白质和质子核核糖碰撞中抗抑郁产生的实验数据。获得的值$σ\ simeq 1 $ fm与其物理解释非常吻合，因为它在点状粒子的碰撞中，其物理解释是抗核心形成区域的大小。因此，该模型使我们能够在一致的框架中计算 - 抗抑郁和抗较高的磁通量既来自二次生产和暗物质歼灭。我们发现，假设具有标准的宇宙射线传播参数，抗3磁通量的降低了AMS-02实验的检测敏感性的数量级，而抗tideuteron通量可以与AMS-02和GAPS实验的敏感性相当。
Antideuteron and antihelium nuclei have been proposed as promising detection channels for dark matter because of the low astrophysical backgrounds expected. To estimate both potential exotic contributions and their backgrounds, one usually employs the coalescence model in momentum space. Here we use instead a newly developed coalescence model based on the Wigner function representations of the produced nuclei states. This approach includes both the process-dependent size of the formation region of antinuclei, and the momentum correlations of coalescing antinucleons in a semi-classical picture. The model contains a single universal parameter $σ$ that we tune to experimental data on antideuteron production in electron-positron, proton-proton and proton-nucleus collisions. The obtained value $σ\simeq 1$ fm agrees well with its physical interpretation as the size of the formation region of antinuclei in collisions of point-like particles. This model allows us therefore to calculate in a consistent frame-work the antideuteron and antihelium fluxes both from secondary production and from dark matter annihilations. We find that the antihelium-3 flux falls short by more than an order of magnitude of the detection sensitivity of the AMS-02 experiment, assuming standard cosmic ray propagation parameters, while the antideuteron flux can be comparable to the sensitivities of the AMS-02 and GAPS experiments.
