用LHC搜索揭示手性抑制的$0νββ$衰变机制
Uncovering a chirally suppressed mechanism of $0νββ$ decay with LHC searches
摘要：
TeV量级的$ΔL =2$轻子数破坏（LNV）可以为未来的无中微子双β $(0νββ)$衰变实验提供另一种解释。从这个角度来看，一类有趣的模型是那些在低能量下产生9维矢量算子和7维算子的模型，它们的$0νββ$衰减速率都是“手性抑制”的。我们研究和比较的灵敏度$0νββ$衰变实验和LHC搜索到一个简化的模型，在这类TeV尺度的LNV也是$SU(2)_L \times U(1)_Y$规范不变。搜索$0νββ$衰变，这是在这里稀释的手征抑制的矢量算子，被发现比LHC搜索，其范围是增加了假设的运动可达性的介质粒子的约束。对于手征抑制的维度7运营商产生的TeV尺度的介质，相反，$0νββ$ -衰变搜索的新汤川耦合的大小上的强大的约束。在大型强子对撞机和$0νββ$衰变实验中，这个模型的信号与观测到的中微子质量完全不相关，因为这些新的LNV源对后者的贡献可以忽略不计。我们发现高亮度LHC和吨级$0νββ$衰变实验的前景，以揭示手征抑制机制与TeV级LNV是有前途的。我们还评论的灵敏度的$0νββ$ -衰变寿命某些未知的低能量常数，在9维{ \it标量}运营商的情况下，预计将是大的，由于非微扰重整化。
英文摘要：
$ΔL =2$ lepton number violation (LNV) at the TeV scale could provide an alternative interpretation of positive signal(s) in future neutrinoless double beta $(0νββ)$ decay experiments. An interesting class of models from this point of view are those that at low energies give rise to dimension-9 vector operators and a dimension-7 operator, both of whose $0νββ$-decay rates are "chirally suppressed". We study and compare the sensitivities of $0νββ$-decay experiments and LHC searches to a simplified model in this class of TeV-scale LNV that is also $SU(2)_L \times U(1)_Y$ gauge invariant. The searches for $0νββ$ decay, which are here diluted by a chiral suppression of the vector operators, are found to be less constraining than LHC searches whose reach is increased by the assumed kinematic accessibility of the mediator particles. For the chirally suppressed dimension-7 operator generated by TeV-scale mediators, in contrast, $0νββ$-decay searches place strong constraints on the size of the new Yukawa coupling. Signals of this model at the LHC and $0νββ$-decay experiments are entirely uncorrelated with the observed neutrinos masses, as these new sources of LNV give negligible contributions to the latter. We find the prospects for the high-luminosity LHC and ton-scale $0νββ$-decay experiments to uncover the chirally-suppressed mechanism with TeV-scale LNV to be promising. We also comment on the sensitivity of the $0νββ$-decay lifetime to certain unknown low-energy constants that in the case of dimension-9 {\it scalar} operators are expected to be large due to non-perturbative renormalization.
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