Millicharged Dark Matter Detection with Ion Traps

被引：46

作者：

Budker, Dmitry ^{[1
,2
,3
]}

Graham, Peter W. ^{[4
,5
]}

Ramani, Harikrishnan ^{[4
]}

Schmidt-Kaler, Ferdinand ^{[1
,2
]}

Smorra, Christian ^{[6
]}

Ulmer, Stefan ^{[7
]}

机构：

[1] Johannes Gutenberg Univ Mainz, D-55128 Mainz, Germany

[2] GSI Helmholtzzentrum Schwerionenforsch, Helmholtz Inst, D-55128 Mainz, Germany

[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[4] Stanford Univ, Stanford Inst Theoret Phys, Stanford, CA 94305 USA

[5] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[6] Johannes Gutenberg Univ Mainz, Inst Phys, Mainz, Germany

[7] RIKEN, Fundamental Symmetries Lab, Wako, Saitama 3510198, Japan

来源：

PRX QUANTUM | 2022年 / 3卷 / 01期

基金：

美国国家科学基金会; 欧盟地平线“2020”;

关键词：

PARTICLES; SEARCH;

D O I：

10.1103/PRXQuantum.3.010330

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose the use of trapped ions for the detection of millicharged dark matter. Millicharged particles will scatter off the ions, giving a signal either in individual events or in the overall heating rate of the ions. Ion traps have several properties that make them ideal detectors for such a signal. First, ion traps have demonstrated significant isolation of the ions from the environment, greatly reducing the background heating and event rates. Second, ion traps can have low thresholds for the detection of energy deposition, down to approximately the nanoelectronvolt range. Third, since the ions are charged, they naturally have large cross sections for scattering with the millicharged particles, this being further enhanced by the low velocities of the thermalized millicharged particles. Despite ion-trap setups being optimized for other goals, we find that existing measurements put new constraints on millicharged dark matter that are many orders of magnitude beyond previous bounds. For example, for a millicharged dark matter mass mQ = 10 GeV and charge 10(-3) of the electron charge, ion traps limit the local density to be nQ < 1 cm(-3), a factor of approximately 10(8) better than current constraints. Future dedicated ion-trap experiments could reach even further into unexplored parameter space.

引用

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