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arXiv 2407.04809hep-ph
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作为冻结(Freeze-Out)互补过程的冻入(Freeze-In)

Freeze-in as a Complementary Process to Freeze-Out

Rodrigo Capucha, Karim Elyaouti, Margarete Mühlleitner, Johann Plotnikov, Rui Santos

AI总结:

本文提出在仅靠freeze-out暗物质无法满足遗迹密度的模型中加入freeze-in FIMP候选粒子,以补足总遗迹密度并解释直接、间接探测缺失下的对撞机丢失能量信号。

摘要:

标准模型的许多扩展都包含一个通过冻结(freeze-out)机制获得的暗物质(DM)候选粒子。在考虑所有实验和理论约束之后,可能出现所有参数点的遗迹密度都低于实验测量值的情况。这意味着这些模型只能部分解决暗物质问题,并且至少还需要一个候选粒子。在本工作中,我们表明,可以进一步用一个通过冻入(freeze-in)机制获得的暗物质候选粒子来扩展模型,从而使其与遗迹密度的实验测量相符。一旦通过这一加入解决了遗迹密度问题,就会产生新的问题。这个包含至少两个暗物质候选粒子的新模型,可能具有一个在直接探测和间接探测中都不可探测的冻结暗物质粒子。如果该冻结暗物质粒子的密度非常低,就可能发生这种情况。因此,若对撞机通过丢失能量中的超出给出暗物质迹象,而在直接和间接探测实验中没有对应结果,则可能标志着弱相互作用大质量粒子(FIMP)的存在。相反,如果发现了一个暗物质粒子,并且某个特定模型能够解释所有可观测物理量,唯独不能给出正确的遗迹密度,那么加入一个额外的FIMP进行扩展即可解决该问题。由于门户耦合很小,冻入暗物质候选粒子不会改变其余的唯象学性质。

英文摘要:

There are many extensions of the Standard Model with a dark matter (DM) candidate obtained via the freeze-out mechanism. It can happen that after all experimental and theoretical constraints are taken into account, all parameter points have a relic density below the experimentally measured value. This means that the models solve only partially the DM problem, and at least one more candidate is needed. In this work we show that it is possible to further extend the model with a DM candidate obtained via the freeze-in mechanism to be in agreement with the relic density experimental measurement. Once the relic density problem is solved with this addition, new questions are raised. This new model with at least two DM candidates could have a freeze-out undetectable DM particle both in direct and indirect detection. This could happen if the freeze-out DM particle would have a very low density. Hence, a collider DM hint via excess in the missing energy with no correspondence in direct and indirect detection experiments, could signal the existence of a Feebly Interacting Massive Particle (FIMP). Conversely, if a DM particle is found and a particular model can explain all observables except the correct relic density, an extension with an extra FIMP would solve the problem. The freeze-in DM candidate, due to the small portal couplings, will not change the remaining phenomenology.

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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