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arXiv 1702.01808hep-ph
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BLSSM中的自然性和暗物质

Naturalness and Dark Matter in the BLSSM

Luigi Delle Rose, Shaaban Khalil, Simon J. D. King, Carlo Marzo, Stefano Moretti, Cem S. Un

摘要:

我们研究了$B-L$超对称标准模型(BLSSM)的自然性,并将其与最小超对称标准模型(MSSM)在两个低(即,大型强子对撞机)能量和高(即,统一)尺度。通过采用标准措施的自然性,我们评估,在存在的额外的规范耦合和标量/费米子质量的BLSSM的完全统一,这样的情况下,揭示了一个更高程度的微调(FT)比MSSM,当后者是计算在统一尺度和所有可用的理论和实验约束,但暗物质(DM)的,考虑。然而,这种差异,主要是由对撞机限制驱动的,要求与BLSSM的额外$U(1)_{B-L}$规范群以及MSSM的$SU(3)_C\times SU(2)_L \times U(1)_Y$的断裂相关的规范玻色子具有高质量,应该被视为为前者付出的相对于后者的适度代价,如果注意到非最小方案提供了大量的参数空间,其中可以找到针对遗迹密度约束的不同组成的许多DM解,与最小结构的情况不同,在最小结构的情况下,在不断减小的参数空间上只有一种类型的解是可访问的。事实上,这两个超对称模型在遵守目前的数据的不同程度的紧张局势是很好地揭示了FT措施时,重新计算的低能谱的两个模型,在其允许的区域的参数空间,现在在所有DM边界的存在下,因为它表明,现在的趋势是相反的,BLSSM出现更自然比MSSM。

英文摘要:

We study the naturalness properties of the $B-L$ Supersymmetric Standard Model (BLSSM) and compare them to those of the Minimal Supersymmetric Standard Model (MSSM) at both low (i.e., Large Hadron Collider) energies and high (i.e., unification) scales. By adopting standard measures of naturalness, we assess that, in presence of full unification of the additional gauge couplings and scalar/fermionic masses of the BLSSM, such a scenario reveals a somewhat higher degree of Fine-Tuning (FT) than the MSSM, when the latter is computed at the unification scale and all available theoretical and experimental constraints, but the Dark Matter (DM) ones, are taken into account. Yet, such a difference, driven primarily by the collider limits requiring a high mass for the gauge boson associated to the breaking of the additional $U(1)_{B-L}$ gauge group of the BLSSM in addition to the $SU(3)_C\times SU(2)_L \times U(1)_Y$ of the MSSM, should be regarded as a modest price to pay for the former in relation to the latter, if one notices that the non-minimal scenario offers a significant volume of parameter space where numerous DM solutions of different compositions can be found to the relic density constraints, unlike the case of the minimal structure, wherein only one type of solution is accessible over an ever diminishing parameter space. In fact, this different level of tension within the two SUSY models in complying with current data is well revealed when the FT measure is recomputed in terms of the low energy spectra of the two models, over their allowed regions of parameter space now in presence of all DM bounds, as it is shown that the tendency is now opposite, the BLSSM appearing more natural than the MSSM.

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