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arXiv 1911.03363hep-ph
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具有单重右手中微子超场的NMSSM中的软轻子生成

Soft leptogenesis in the NMSSM with a singlet right-handed neutrino superfield

Waleed Abdallah, Abhass Kumar, Abhijit Kumar Saha

摘要:

在这项工作中,我们探讨软leptogenesis的NMSSM框架扩展的右手中微子超场。我们计算了CP不对称性,$\varepsilon$,并发现它是非零的树级不使用热效应的最终状态粒子。这是相反的软leptogenesis在MSSM扩展的右手中微子超场的热效应是必不可少的。这种差异是由于在NMSSM中存在违反树能级轻子数的超中微子三体衰变。除此之外,我们还发现,如果附加的单重标量具有一个复真空期望值,而所有其他NMSSM参数,包括与CP不对称性相关的软超对称破缺参数,仍然是实的,则$\varepsilon\neq 0$.我们估计这些参数的数量级,以产生足够的重子不对称的宇宙。

英文摘要:

In this work, we explore soft leptogenesis in the NMSSM framework extended by a right-handed neutrino superfield. We calculate the CP asymmetry, $\varepsilon$, and find it to be non-zero at tree-level without using thermal effects for the final state particles. This is in contrast to soft leptogenesis in the MSSM extended by a right-handed neutrino superfield where thermal effects are essential. The difference arises due to the presence of a 3-body decay of the sneutrino in the NMSSM that violates lepton number at tree-level. Apart from this, we also find that $\varepsilon\neq 0$ if the additional singlet scalar has a complex vacuum expectation value while all the other NMSSM parameters including the soft SUSY breaking ones relevant for CP asymmetry remain real. We estimate the order of magnitudes of these parameters to produce sufficient baryon asymmetry of the Universe.

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