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arXiv 1306.4171hep-phastro-ph.COastro-ph.HE
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用宇宙反氘核研究暗物质:现状与展望

Dark matter searches with cosmic antideuterons: status and perspectives

N. Fornengo, L. Maccione, A. Vittino

摘要:

在宇宙射线中寻找反氘核已被认为是间接探测暗物质,特别是低质量或中等质量的暗物质粒子的一个有希望的途径。随着AMS-02实验目前的运行阶段和未来专用实验-通用反粒子谱仪的不断发展,在不久的将来探测暗物质的前景令人振奋。在本文中,我们开发了一个详细和完整的宇宙射线反氘核信号的重新分析,通过讨论的主要相关问题,通过星际介质和日光层的反氘核的生产和传播。特别是,我们第一次批判性地重新审视合并机制反氘生产的暗物质湮灭过程。然后,由于反氘核搜索有其最好的前景,在低动能的太阳风和磁场的影响是最相关的检测,我们解决太阳调制建模的反氘核通量在地球上开发一个完整的数值4D解决方案的宇宙射线运输在日光层。最后,我们使用这些改进的预测提供更新的AMS-02和GAPS的到达能力的估计,兼容PAMELA的反质子测量所施加的当前约束。在应用反质子束缚后,发现在GAPS LDB+和AMS-02任务中探测多达15个事件的前景,这取决于暗物质质量、湮灭率和产生通道,另一方面取决于合并过程、银河系和太阳输运参数。

英文摘要:

The search for antideuterons in cosmic rays has been proposed as a promising channel for dark matter indirect detection, especially for dark matter particles with a low or intermediate mass. With the current operational phase of the AMS-02 experiment and the ongoing development of a future dedicated experiment, the General Antiparticle Spectrometer (GAPS), there are exciting prospects for a dark matter detection in the near future. In this paper we develop a detailed and complete re-analysis of the cosmic-ray antideuteron signal, by discussing the main relevant issues related to antideuteron production and propagation through the interstellar medium and the heliosphere. In particular, we first critically revisit the coalescence mechanism for antideuteron production in dark matter annihilation processes. Then, since antideuteron searches have their best prospects of detection at low kinetic energies where the effect of the solar wind and magnetic field are most relevant, we address the impact of solar modulation modeling on the antideuteron flux at the Earth by developing a full numerical 4D solution of cosmic rays transport in the heliosphere. We finally use these improved predictions to provide updated estimates of the reaching capabilities for AMS-02 and GAPS, compatible with the current constraints imposed by the antiprotons measurements of PAMELA. After the antiproton bound is applied, prospects of detection of up to about 15 events in GAPS LDB+ and AMS-02 missions are found, depending on the dark matter mass, annihilation rate and production channel from one side, and on the coalescence process, galactic and solar transport parameters on the other.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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