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arXiv 1503.01119hep-ph
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最小不对称暗物质

Minimal Asymmetric Dark Matter

Sofiane M. Boucenna, Martin B. Krauss, Enrico Nardi

摘要:

在早期宇宙中,任何携带守恒量子数并与热浴处于化学平衡的粒子都必然继承粒子-反粒子不对称性。这种类型的新粒子,如果稳定的话,将代表不对称暗物质(DM)的候选者,其不对称性与重子不对称性直接相关。我们研究了仅由一个(通用)携带超荷的$SU(2)_L$多重态$χ$构成的最小DM扇区的这种可能性,假设在高于电弱相变的温度下,有效的算符强制实现$χ$和希格斯玻色子之间的化学平衡。我们认为,DM直接检测搜索的限制严重限制了这种情况下,留下的唯一可能性标量或费米子多重带超荷$y = 1$,优先五重或更大的$SU(2)$表示,并在几个TeV范围内的质量。

英文摘要:

In the early Universe, any particle carrying a conserved quantum number and in chemical equilibrium with the thermal bath will unavoidably inherit a particle-antiparticle asymmetry. A new particle of this type, if stable, would represent a candidate for asymmetric dark matter (DM) with an asymmetry directly related to the baryon asymmetry. We study this possibility for a minimal DM sector constituted by just one (generic) $SU(2)_L$ multiplet $χ$ carrying hypercharge, assuming that at temperatures above the electroweak phase transition an effective operator enforces chemical equilibrium between $χ$ and the Higgs boson. We argue that limits from DM direct detection searches severely constrain this scenario, leaving as the only possibilities scalar or fermion multiplets with hypercharge $y = 1$, preferentially quintuplets or larger $SU(2)$ representations, and with a mass in the few TeV range.

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