用中子EDM谱仪研究宏观CP破坏力
Search for macroscopic CP violating forces using a neutron EDM spectrometer
摘要：
在所谓的轴子窗口（lam的力范围在2 × 10 ^-5 m到0.02 m之间）中寻找核子之间的CP破坏力是很有趣的，因为在那里只有很少的实验信息。类轴子粒子会对接近大块物质的中子产生赝磁场。实验室研究在磁共振光谱仪中使用超冷中子研究靠近重镜的中子自旋进动。在磁共振没有位移的情况下，我们用标量和伪标量无量纲常数的乘积gs x gp建立了类轴子粒子耦合强度的新约束，作为力范围lam的函数，当10^-4 cm < lam < 1 cm时，gs x gp x lam^2 <= 2x 10 -21 [cm^2]（C.L.95%）。对于0.1 cm < lam < 1 cm，先前的限制提高了4至5个数量级。
英文摘要：
The search for CP violating forces between nucleons in the so-called axion window of force ranges lam between 2x10^-5 m and 0.02 m is interesting because only little experimental information is available there. Axion-like particles would induce a pseudo-magnetic field for neutrons close to bulk matter. A laboratory search investigates neutron spin precession close to a heavy mirror using ultracold neutrons in a magnetic resonance spectrometer. From the absence of a shift of the magnetic resonance we established new constraints on the coupling strength of axion-like particles in terms of the product gs x gp of scalar and pseudo-scalar dimensionless constants, as a function of the force range lam, gs x gp x lam^2 <= 2x10-21 [cm^2] (C.L.95%) for 10^-4 cm < lam < 1 cm. For 0.1 cm < lam < 1 cm previous limits are improved by 4 to 5 orders of magnitude.
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