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arXiv 1706.02253hep-ph
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共振Wino暗物质的零程有效场论I.框架

Zero-Range Effective Field Theory for Resonant Wino Dark Matter I. Framework

Eric Braaten, Evan Johnson, Hong Zhang

摘要:

最戏剧性的“索末菲增强”的中性wino对湮灭发生时,wino质量是接近一个临界值,有一个零能量的S波共振在中性wino对阈值。在这样一个临界质量附近,低能winos可以用零射程有效场论来描述,其中winos通过接触相互作用非微扰地相互作用。有效场论是由重整化群不动点控制的,在该不动点处中性和带电粒子质量简并,散射长度为无穷大。零程有效场论的参数可以通过匹配Wino-Wino散射振幅来确定,而Wino-Wino散射场的振幅是通过求解弱规范玻色子交换引起的Winos通过势相互作用的薛定谔方程来计算的.当wino质量大于临界值时,共振为wino对束缚态。本文通过计算两个中性粒子碰撞产生束缚态的速率,说明了零程有效场论的威力。

英文摘要:

The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is near a critical value where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. Near such a critical mass, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through a contact interaction. The effective field theory is controlled by a renormalization-group fixed point at which the neutral and charged winos are degenerate in mass and their scattering length is infinite. The parameters of the zero-range effective field theory can be determined by matching wino-wino scattering amplitudes calculated by solving the Schrödinger equation for winos interacting through a potential due to the exchange of weak gauge bosons. If the wino mass is larger than the critical value, the resonance is a wino-pair bound state. The power of the zero-range effective field theory is illustrated by calculating the rate for formation of the bound state in the collision of two neutral winos through the emission of two soft photons.

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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