暗物質直接探測

Dark Matter Direct Detections

李俊豪(Chun-Hao Lee)

指導教授 ： 耿朝強

國立清華大學/理學院/物理學系/碩士(2017年)

摘要

暗物質直接探測在具有以下特質的模型，如：違背同位旋的耦合，放熱散射， 和/或輕介體粒子，被探究為了減少 CDMS-Si 實驗的正面信號與其他負面搜索的分歧。我們特別聚焦於能導致予與自旋無關的暗物質-核子散射的非標準有效算符，而這些算符對於動量轉移與暗物質移動速度有不同依賴性。因此， 選擇這樣的有效算符在最後的擬合上比較有平緩的效果。然而，通過LUX， PandaX-II 和 PICO-60 實驗的最新限制，我們發現，在幾乎所有被考慮的模型裡，CDMS-Si 的信號範圍都被 LUX，PandaX-II與PICO-60實驗嚴重限制或完全排除。所以，我們得出的結論是，用現今的暗物質框架來解釋CDMS-Si的信號是非常困難的事。

關鍵字

暗物質 ； 直接探測

並列摘要

Dark matter (DM) direct detections are investigated for models with the following properties: isospin-violating couplings, exothermic scatterings, and/or a light mediator, with the aim to reduce the tension between the CDMS-Si positive signals and other negative searches. In particular, we focus on the non-standard effective operators which could lead to the spin-independent DM-nucleus scatterings with non-trivial dependencies on the momentum transfer or DM velocity. As a result, such effective operator choices have the very mild effects on the final fittings. Furthermore, by including the latest constraints from LUX, PandaX-II, and PICO-60, we find that, for almost all the considered models, the predicted CDMS-Si signal regions are either severely constrained or completely excluded by the LUX, PandaX-II and PICO-60 data, including the most promising Xe-phobic exothermic DM models with/without a light mediator. Therefore, we conclude that it is very difficult for the present DM framework to explain the CDMS-Si excess.

並列關鍵字

Dark Matter ； Direct Detections

參考文獻

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