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arXiv 2302.11201hep-ph
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大质量弱相互作用中性粒子与原子核散射中的相干性

Coherence in scattering of massive weakly interacting neutral particles off nuclei

V. A. Bednyakov

AI总结:

本文提出一种同时考虑弹性与非弹性贡献的弱相互作用中性粒子与原子核散射新方法,并指出在相干截面受抑时,非弹性伴随的伽马辐射对暗物质直接探测至关重要。

摘要:

本文提出了一种描述非相对论性大质量中性粒子(轻子)与原子核之间弱相互作用的新方法,在该过程中原子核保持其完整性。此类过程的截面是弹性(或相干)贡献与非弹性(非相干)贡献之和,其中弹性贡献对应原子核保持其初始状态,而非弹性贡献对应原子核处于激发态。从弹性散射到非弹性散射的平滑过渡由核形状因子对传递给原子核的动量转移的依赖性所决定。弱相互作用的强度由决定轻子流与核子流标量积对概率振幅贡献的参数设定。所得表达式至少在直接探测暗物质大质量弱相互作用中性粒子问题中具有意义,因为在这种情况下,与普遍接受的方法相比,弹性过程和非弹性过程被同时考虑。研究表明,当相干截面被强烈抑制或无法探测时,伴随原子核退激发产生特征辐射(光子)的非弹性贡献的存在变得至关重要。因此,为了获取关于暗物质粒子的最大信息,应规划旨在直接探测暗物质粒子的实验,其设置应允许同时探测原子核的反冲能量和原子核退激发产生的伽马量子。

英文摘要:

The paper presents a novel approach to the description of the nonrelativistic weak interaction of a massive neutral particle (lepton) and a nucleus, in which the latter retains its integrity. The cross section of such a process is a sum of the elastic (or coherent) contribution, when the nucleus remains in its original state, and the inelastic (incoherent) contribution, when the nucleus is in an excited state. Smooth transition from elastic scattering to inelastic scattering is governed by the dependence of the nuclear form factors on the momentum transferred to the nucleus. The intensity of the weak interaction is set by the parameters that determine the contributions to the probability amplitude from the scalar products of the leptonic and nucleon currents. The resulting expressions are of interest, at least in the problem of direct detection of neutral massive weakly interacting particles of dark matter, since in this case, in contrast to the generally accepted approach, both elastic and inelastic processes are simultaneously considered. It is shown that the presence of the inelastic contribution accompanied by emission of characteristic radiation (photons) from the deexcitation of the nucleus turns out to be decisive when the coherent cross section is strongly suppressed or cannot be detected. Therefore in order to extract maximum information about dark matter particles, one should plan experiments aimed at the direct detection of dark matter particles in a setting that allows one to detect both the recoil energy of the nucleus and the gamma quanta from the deexcitation of the nucleus.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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