Primordial nucleosynthesis and hadronic decay of a massive particle with a relatively short lifetime
Primordial nucleosynthesis and hadronic decay of a massive particle with a relatively short lifetime
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DOI：
10.1103/physrevd.64.043515
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发表时间：
2001-03
影响因子：
5
通讯作者：
K. Kohri
中科院分区：
文献类型：
--
作者：
K. Kohri
本文研究了长寿命大质量粒子的强子衰变对大爆炸核合成的影响。如果高能强子在BBN纪元附近发射(t{近似}10{sup-2}-10{sup-2}秒)，即使在中质子比冻结时间之后，它们也会异常地相互转换背景核子。然后，产生的轻元素丰度发生变化，这可能导致标准BBN与观测值之间的显著差异。特别是在理论方面，我们现在可以获得大量关于强子的实验数据，模拟强子的衰变过程，即使在没有实验数据的高能区也可以执行强子碎裂的数值程序。利用强子注入情形下计算的轻元素丰度，通过比较我们的理论结果和观测结果，我们得到了对这种粒子性质的约束。
In this paper we consider the effects on big bang nucleosynthesis (BBN) of the hadronic decay of a long-lived massive particle. If high-energy hadrons are emitted near the BBN epoch (t{approx}10{sup -2}--10{sup 2}sec), they extraordinarily interconvert the background nucleons with each other even after the freeze-out time of the neutron to proton ratio. Then, the produced light element abundances are changed, and that may result in a significant discrepancy between standard BBN and observations. Especially on the theoretical side, we can now obtain a lot of experimental data on hadrons and simulate the hadronic decay process, executing the numerical code of the hadron fragmentation even in the high energy region where we have no experimental data. Using the computed light element abundances in the hadron-injection scenario, we derive a constraint on the properties of such a particle by comparing our theoretical results with observations.