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arXiv 1205.2695hep-phastro-ph.COnucl-th
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手征有效理论中的WIMP核散射

WIMP-nucleus scattering in chiral effective theory

Vincenzo Cirigliano, Michael L. Graesser, Grigory Ovanesyan

摘要:

在手征有效理论的框架下讨论了WIMP与核子相互作用的长距离QCD修正。对于标量介导的WIMP-夸克相互作用,我们计算了WIMP-原子核弹性截面的所有次前级修正,包括双核子振幅和与反冲能相关的单核子标量形状因子的位移。因此,标量介导的WIMP-核截面不能仅用两个量来参数化,即零动量转移时的中子和质子标量形状因子,但会出现额外的参数,这取决于短距离WIMP-夸克相互作用。此外,乘法因式分解的横截面成粒子,核和天体粒子的部分是违反的。在实践中,虽然新的影响是自然的手征功率计数预期的大小,他们变得非常重要的参数空间的区域中,领先的顺序WIMP核振幅被抑制,包括所谓的“同位旋破坏暗物质“制度。在这些区域的参数空间中,我们发现的总散射率和反冲光谱的形状的定性变化的数量级的修正。

英文摘要:

We discuss long-distance QCD corrections to the WIMP-nucleon(s) interactions in the framework of chiral effective theory. For scalar-mediated WIMP-quark interactions, we calculate all the next-to-leading-order corrections to the WIMP-nucleus elastic cross-section, including two-nucleon amplitudes and recoil-energy dependent shifts to the single-nucleon scalar form factors. As a consequence, the scalar-mediated WIMP-nucleus cross-section cannot be parameterized in terms of just two quantities, namely the neutron and proton scalar form factors at zero momentum transfer, but additional parameters appear, depending on the short-distance WIMP-quark interaction. Moreover, multiplicative factorization of the cross-section into particle, nuclear and astro-particle parts is violated. In practice, while the new effects are of the natural size expected by chiral power counting, they become very important in those regions of parameter space where the leading order WIMP-nucleus amplitude is suppressed, including the so-called "isospin-violating dark matter" regime. In these regions of parameter space we find order-of-magnitude corrections to the total scattering rates and qualitative changes to the shape of recoil spectra.

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