Softwares for research simulations

Softwares: AtomIonCalc1, DarkARC, realEarthScatterDM2

Boosted dark matter represents an attractive class of models containing a fast-moving dark matter particle, which can lead to nonstandard nuclear or electron recoil signals in direct detection experiments. It has been shown that this interpretation successfully explains the excess of keV electron recoil events recently observed by the XENON1T experiment, and that a daily modulation of the signal in the detector is expected.

In our work we investigate the modulation feature in much greater detail and in a more general framework. We perform simulations of the dark matter interactions with electrons in atoms building up the Earth on its path to the detector, and we provide detailed predictions for the expected daily changes in the boosted dark matter signal for various direct detection experiments, including XENON1T, PandaX, and LUX-ZEPLIN. More detailes can be found from the arXiv:2110.09685 (paperEarth Shielding and Daily Modulation from Electrophilic Boosted Dark Matter).

The software used in this research is publicly available. The ionization form factor is calculated using AtomIonCalc1 , which is refined from the software DarkARC. The software realEarthScatterDM2 is used to simulate the DM propagation inside the Earth, and was independently developed for this research.

Softwares: Mathematica

Effective field theory (EFT) provides a systematical framework for parametrizing various new physics only based on the field content, the Lorentz invariance, and the gauge symmetries in the standard model(SM). Recently we present a complete list of the dimension 8 operator basis in the standard model effective field theory ( SMEFT) using group theoretic techniques in a systematic and automated way. We adopt a new form of operators in terms of the irreducible representations of the Lorentz group, and identify the Lorentz structures as states in a SU(N) group. Our algorithm can be easily applied to higher dimensional standard model effective field theory and other effective field theories, making these studies more approachable.

The whole procedure is implemented and automized by Mathematica, and our code can be easily applied to higher dimensions of SMEFT and other EFTs beyond the SM. In terms of efficiency, listing the dimension 8 operators only cost less than 2 min on a personal laptop. See details in in our work arXiv:2005.00008 ("Complete Set of Dimension-8 Operators in the Standard Model Effective Field Theory", Hao-Lin Li, Zhe Ren, Jing Shu, Ming-Lei Xiao, Jiang-Hao Yu, Yu-Hui Zheng, Phys. Rev. D 104, 015026 (2021))