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利用六维有效算符对长寿命粒子的宇宙学限制

Cosmological Constraints on Long-Lived Particles Using Dimension-Six Effective Operators

Universidade Federal do Rio Grande do Norte(北里奥格兰德联邦大学);International Institute of Physics, Universidade Federal do Rio Grande do Norte(北里奥格兰德联邦大学国际物理研究所);Millennium Institute for Subatomic Physics at the High-Energy Frontier (SAPHIR) of ANID(智利国家研究与创新局高能前沿亚原子物理千年研究所(SAPHIR));Universidad de La Serena(拉塞雷纳大学);Universidade Federal de Pernambuco(伯南布哥联邦大学)

Mickael V. S. de Farias, Rodrigo Holanda, Matheus M. A. Paixao, Farinaldo S. Queiroz, Priscila V. dos Santos

AI总结:

研究长寿命粒子衰变成暗物质对早期宇宙核合成和有效中微子种数的影响,通过六维有效算符分析其在宇宙学约束中的作用。

摘要:

长寿命粒子(LLPs)为标准模型外物理提供了有趣的窗口,提供碰撞机理和宇宙学中的特征信号。本文研究LLPs衰变成暗物质的过程。如果LLPs寿命超过10^4秒,衰变产物会破坏早期宇宙轻核合成并改变大爆炸核合成(BBN)预测。如果LLPs比暗物质粒子更重,衰变会增加有效中微子种数Neff。我们通过六维有效算符描述这些衰变,并概述参数空间,其中这些衰变符合来自BBN、结构形成、宇宙微波背景和宇宙学声学振荡数据的宇宙学限制。

英文摘要:

Long-lived particles (LLPs) provide an interesting window into physics beyond the Standard Model, offering characteristic signatures at colliders and in cosmology. In this work, we investigate LLPs decays into dark matter. If the lifetime of LLPs are longer than $10^4$ s, the decay products can disrupt the synthesis of light nuclei in the early universe and alter Big Bang Nucleosynthesis (BBN) predictions. If the LLP is much heavier than the dark matter particle, the decay contributes to the number of effective neutrino species, $N_{eff}$. We describe these decays via dimension-six effective operators and outline the parameter space in which such decays obey cosmological bounds stemming from BBN, structure formation, Cosmic Microwave Background, and Baryon Acoustic Oscillation data.

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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