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arXiv 2404.01375hep-ph
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SMEFT在量纲-8下的$Z^\prime$模型匹配

SMEFT Matching to $Z^\prime$ Models at Dimension-8

Sally Dawson, Matthew Forslund, Marvin Schnubel

AI总结:

本文将SMEFT匹配到包含重$Z^\prime$玻色子的模型并引入量纲-8算符效应,结合电弱精确测量与LHC数据限制参数,发现SMEFT系数限制具模型依赖性且量纲-8影响较小,不变质量分布限制强于$A_\text{FB}$测量。

摘要:

重中性规范玻色子出现在许多受激发的Beyond the Standard Model Physics模型中。实验搜索要求在大多数模型中此类规范玻色子高于TeV尺度,这意味着有效场论工具,特别是Standard Model Effective Field Theory (SMEFT),是有用的。我们将SMEFT匹配到具有重$Z^\prime$玻色子的模型,包括量纲-8算符的效应,并考虑来自电弱精确测量以及Drell Yan不变质量分布和LHC上前后不对称性$A_\text{FB}$测量对模型参数的限制。结果证明了SMEFT系数所得限制的模型依赖性,以及包含量纲-8匹配的相对较小影响。在所有情况下,我们考虑的$Z^\prime$模型中来自不变质量分布的限制强于来自$A_\text{FB}$测量的限制。

英文摘要:

Heavy neutral gauge bosons arise in many motivated models of Beyond the Standard Model Physics. Experimental searches require that such gauge bosons are above the TeV scale in most models which means that the tools of effective field theories, in particular the Standard Model Effective Field Theory (SMEFT), are useful. We match the SMEFT to models with heavy $Z^\prime$ bosons, including effects of dimension-8 operators, and consider the restrictions on model parameters from electroweak precision measurements and from Drell Yan invariant mass distributions and forward-backward asymmetry, $A_\text{FB}$, measurements at the LHC. The results demonstrate the model dependence of the resulting limits on SMEFT coefficients and the relatively small impact of including dimension-8 matching. In all cases, the limits from invariant mass distributions are stronger than from $A_\text{FB}$ measurements in the $Z^\prime$ models we consider.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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