Interference effects in dilepton resonance searches for Z′ bosons and dark matter mediators
Interference effects in dilepton resonance searches for Z′ bosons and dark matter mediators
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双轻子共振寻找 Z′ 玻色子和暗物质介体的干扰效应
DOI：
10.1007/jhep03(2020)104
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发表时间：
2019
影响因子：
5.4
通讯作者：
P. Tunney
中科院分区：
文献类型：
--
作者：
F. Kahlhoefer;A. Mück;S. Schulte;P. Tunney
新的 Z′ 规范玻色子出现在标准模型的许多扩展中，并预测双轻子不变质谱中的共振。因此，对这种共振的搜索为许多新物理学模型提供了重要的约束，但所得到的边界通常是在没有干扰效应的情况下计算的。在这项工作中，我们表明，当 Z' 宽度很大时（例如由于隐形贡献），干扰的影响是显着的并且不能被忽略。为了说明这一点，我们实现并验证了 ATLAS 最新的 139 fb−1 双轻子搜索，并获得了一般 Z′ 模型以及具有自旋 1 介体的简化暗物质模型的排除限制。我们发现干扰可以大大加强 Z' 耦合的束缚，并将暗物质简化模型的排除极限推至更高的 Z' 质量值。与这项研究一起，我们发布了开源代码 ZPEED，它为一般 Z' 模型提供了快速似然和排除界限。
New Z′ gauge bosons arise in many extensions of the Standard Model and predict resonances in the dilepton invariant mass spectrum. Searches for such resonances therefore provide important constraints on many models of new physics, but the resulting bounds are often calculated without interference effects. In this work we show that the effect of interference is significant and cannot be neglected whenever the Z′ width is large (for example because of an invisible contribution). To illustrate this point, we implement and validate the most recent 139 fb−1 dilepton search from ATLAS and obtain exclusion limits on general Z′ models as well as on simplified dark matter models with spin-1 mediators. We find that interference can substantially strengthen the bound on the Z′ couplings and push exclusion limits for dark matter simplified models to higher values of the Z′ mass. Together with this study we release the open-source code ZPEED, which provides fast likelihoods and exclusion bounds for general Z′ models.
在 Drell-Yan 过程中根据 p T 测量约束 Z 宽度
影响因子：
5
作者：
Accomando E
通讯作者：
Accomando E