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关于广义Kaluza-Klein胶子

On Broad Kaluza-Klein Gluons

Rafel Escribano, Mikel Mendizabal, Mariano Quirós, Emilio Royo

备注：
32 pages, 14 figures; v2 includes additional references and correct units for cross-section on vertical axis of Fig. 14
发表信息：
J. High Energ. Phys. 2021, 121 (2021)
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摘要：

在具有弯曲额外维度的理论中，复合费米子，例如右手顶夸克，可以非常强地耦合到卡鲁扎-克莱因（KK）场。特别是，KK胶子在这种复合场的存在下成为非常广泛的共振，从而显着修改其实验签名。我们计算了KK胶子的极质量和极宽度，以及用全传播子对质子-质子截面的预言，并与通常的Breit-Wigner近似作了比较。我们比较了这两种方法，以及现有的实验数据从ATLAS和CMS，$t\bar t$，$t\bar t W$，$t\bar t Z$，$t\bar t H$和$t\bar t t\bar t$通道。我们发现这两种方法之间的差异高达约100%，这突出表明，广泛共振的影响可能是戏剧性的，主要是未来的实验搜索。通道$t\bar t t\bar t$特别有前途，因为横截面信号的大小与标准模型预测的数量级相同，并且在该通道中的未来实验分析，特别是对于宽共振，可以揭示超越标准模型的可能物理学的性质。

英文摘要：

In theories with a warped extra dimension, composite fermions, as e.g. the right-handed top quark, can be very strongly coupled to Kaluza-Klein (KK) fields. In particular, the KK gluons in the presence of such composite fields become very broad resonances, thus remarkably modifying their experimental signatures. We have computed the pole mass and the pole width of the KK gluon, triggered by its interaction with quarks, as well as the prediction for proton-proton cross-sections using the full propagator and compared it with that obtained from the usual Breit-Wigner approximation. We compare both approaches, along with the existing experimental data from ATLAS and CMS, for the $t\bar t$, $t\bar t W$, $t\bar t Z$, $t\bar t H$, and $t\bar t t\bar t$ channels. We have found differences between the two approaches of up to about 100%, highlighting that the effect of broad resonances can be dramatic on present, and mainly future, experimental searches. The channel $t\bar t t\bar t$ is particularly promising because the size of the cross-section signal is of the same order of magnitude as the Standard Model prediction, and future experimental analyses in this channel, especially for broad resonances, can shed light on the nature of possible physics beyond the Standard Model.

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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