Cosmic rays, antihelium, and an old navy spotlight
Cosmic rays, antihelium, and an old navy spotlight
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DOI：
10.1103/physrevd.96.103021
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发表时间：
2017-04
影响因子：
5
通讯作者：
Kfir Blum;K. Ng;R. Sato;M. Takimoto
中科院分区：
文献类型：
--
作者：
Kfir Blum;K. Ng;R. Sato;M. Takimoto
宇宙射线反氘和反氦一直被认为是暗物质的探测器，因为它们的次级天体物理产物被认为是极其稀少的。但如何预测二次通量呢？反核主要产生于pp碰撞，而实验室截面数据缺乏。我们在解决这个问题的一个新的尝试，呼吁与强子发射区的物理体积的核合并的标度律。同样的体积探测Hanbury布朗Twiss（HBT）的两粒子相关。我们证明了从中心和离轴AA碰撞到PA碰撞的系统的标度律的一致性，跨越3个数量级的合并产率。将体积缩放扩展到PP系统，HBT数据使我们能够对聚结进行新的估计，我们对初步ALICE PP数据进行了测试。对于反氦，得到的截面比以前的估计高1-2个数量级。反氦的天体物理次级通量可能在AMS 02暴露五年的范围内。
Cosmic-ray anti-deuterium and anti-helium have long been suggested as probes of dark matter, as their secondary astrophysical production was thought extremely scarce. But how does one actually predict the secondary flux? Anti-nuclei are dominantly produced in pp collisions, where laboratory cross section data is lacking. We make a new attempt at tackling this problem by appealing to a scaling law of nuclear coalescence with the physical volume of the hadronic emission region. The same volume is probed by Hanbury Brown-Twiss (HBT) two-particle correlations. We demonstrate the consistency of the scaling law with systems ranging from central and off-axis AA collisions to pA collisions, spanning 3 orders of magnitude in coalescence yield. Extending the volume scaling to the pp system, HBT data allows us to make a new estimate of coalescence, that we test against preliminary ALICE pp data. For anti-helium the resulting cross section is 1-2 orders of magnitude higher than earlier estimates. The astrophysical secondary flux of anti-helium could be within reach of a five-year exposure of AMS02.