arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.3280hep-phastro-ph.HE
收藏

高能助推暗物质和IceCube上PeV事件的直接探测

The Direct Detection of Boosted Dark Matter at High Energies and PeV events at IceCube

Atri Bhattacharya, Raj Gandhi, Aritra Gupta

摘要:

我们研究了直接通过一个小的,但充满活力的组件,允许在当今的限制检测暗物质的可能性。密切的事实,即中性电流中微子核子相互作用是不可区分的DM核子相互作用在低能量下,我们将这一功能扩展到高能量的一个小的,非热的,但高能量的人口DM粒子$χ$,通过一个显着更大的质量和寿命长的非热遗迹$ϕ$,形成了大部分的DM衰变创建。如果$χ$与核子相互作用,它的截面,像中微子-核相干截面一样,可以随着能量急剧上升,导致深度非弹性散射,类似于高能时的中性流中微子-核子相互作用。因此,它的直接检测可能通过级联在非常大的中微子探测器。作为一个具体的例子,我们应用这个概念,最近报道的三个超高能量PeV级联事件聚集在$1-2$ PeV在冰立方(IC)。我们讨论的功能,这可能有助于区分这种情况下,只有天体物理中微子构成的事件样本,如IC探测器。

英文摘要:

We study the possibility of detecting dark matter directly via a small but energetic component that is allowed within present-day constraints. Drawing closely upon the fact that neutral current neutrino nucleon interactions are indistinguishable from DM-nucleon interactions at low energies, we extend this feature to high energies for a small, non-thermal but highly energetic population of DM particle $χ$, created via the decay of a significantly more massive and long-lived non-thermal relic $ϕ$, which forms the bulk of DM. If $χ$ interacts with nucleons, its cross-section, like the neutrino-nucleus coherent cross-section, can rise sharply with energy leading to deep inelastic scattering, similar to neutral current neutrino-nucleon interactions at high energies. Thus, its direct detection may be possible via cascades in very large neutrino detectors. As a specific example, we apply this notion to the recently reported three ultra-high energy PeV cascade events clustered around $1-2$ PeV at IceCube (IC). We discuss the features which may help discriminate this scenario from one in which only astrophysical neutrinos constitute the event sample in detectors like IC.

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。

↑