Resonant annihilation of long-lived massive colored particles through hadronic collisions
Resonant annihilation of long-lived massive colored particles through hadronic collisions
复制标题
通过强子碰撞共振湮灭长寿命的大质量彩色粒子
DOI：
10.1103/physrevd.85.015005
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发表时间：
2012
影响因子：
5
通讯作者：
竹迫知博
中科院分区：
文献类型：
--
作者：
日下部元彦;竹迫知博
假设长寿命的大质量有色粒子（MCP或）将被限制在无色的外来强相互作用大质量粒子（SIMPs）中，其色限制温度为。两个长寿命的MCP在两个SIMP碰撞时形成束缚态（）。我们研究了MCP湮灭对共振衰减特性的敏感性（），以及外来SIMPs的结合能或能级。本文假设（）的形成主要通过（）的共振进行。我们制作了一个湮灭有效截面的玩具模型。然后，针对指定⑴共振的性质、SIMPs的结合能、MCP的初始丰度和质量的不同参数集合计算SIMPs的丰度。计算得到的SIMP各粒子的残余丰度是重子的2倍。它们可以比以前的估计高得多，但不能比以前的估计小得多。丰度可以是一致的，这取决于参数与可能的情况下，SIMPs绑定到核和随后的外来核反应减少的原始丰度ofor增强的和/或B在早期宇宙。通过对轻元素丰度作为观测量的湮灭过程的详细研究，未来可能会获得关于早期宇宙中夸克-强子相变的独特信息。
Hypothetical long-lived massive colored particles (MCPs or) would be confined in colorless exotic strongly interacting massive particles (SIMPs) at a color confinement temperature of. Two long-lived MCPs form a bound state () at collisions of two SIMPs. We study sensitivities of MCP annihilation to decay properties of resonances (), and binding energies or energy levels of exotic SIMPs. The () formation is assumed to dominantly proceed through resonances of () in this paper. We make a toy model of the effective cross section forannihilation. Abundances of SIMPs are then calculated for different sets of parameters specifying properties of () resonances, binding energies of SIMPs, the initial abundance and the mass of MCP. Calculated relic abundances for respective SIMP species aretimes that of baryon. They can be much higher but cannot be much smaller than the previous estimate. The abundances can be consistent depending on parameters with the possible scenario that SIMPs bind to nuclei and subsequent exotic nuclear reactions reduce the primordial abundance ofor enhance those ofand/or B in the early Universe. A unique information on the quark-hadron phase transition in the early Universe may become available in future by elaborated studies on the annihilation process with light element abundances as observables.