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arXiv 2012.09724hep-phhep-ex
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引力CP破坏的实验提示

Experimental hint for gravitational CP violation

V. Gharibyan

摘要:

粒子和反粒子引力相互作用的相等性在广义相对论中成立,并得到间接观测的支持。对于非相对论性物质,引力对旋转或自旋方向的依赖性在实验上受到限制。本文发展了一种基于高能康普顿散射的方法来测量加速带电粒子的引力相互作用。在这种形式主义中,HERA测量的康普顿光谱排除了反物质反重力的可能性,置信度接近100%。然而,同样的数据意味着引力CP破坏在13 GeV能量附近,电荷的最大值为9 +/- 2 ppt,空间宇称的最大值为13 +/- 3 ppt。探测到的不对称暗示了相对于右螺旋正电子,左螺旋电子的引力耦合更强。

英文摘要:

An equality of particle and antiparticle gravitational interactions holds in general relativity and is supported by indirect observations. Gravity dependence on rotation or spin direction is experimentally constrained for non-relativistic matter. Here a method based on high energy Compton scattering is developed to measure the gravitational interaction of accelerated charged particles. Within that formalism the Compton spectra measured at HERA rule out the speculated anti-gravity possibility for antimatter at a confidence level close to 100%. The same data, however, imply a gravitational CP violation around 13 GeV energies, by a maximal amount of 9 +/- 2 ppt for the charge and 13 +/- 3 ppt for the space parity. The detected asymmetry hints for a stronger gravitational coupling to left helicity electrons relative to right helicity positrons.

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