强子对撞机中电弱相互作用大质量粒子的非微扰效应

Taisuke Katayose, S. Matsumoto, S. Shirai
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引用次数: 3

摘要

电弱相互作用大质量粒子(ewimp),换句话说,在标准模型(SM)的电弱相互作用下带电的新大质量粒子,经常在各种新的物理模型中得到预测。在强子对撞机实验中,不仅通过观察它们的直接产生,而且通过测量它们对SM轻子对产生的Drell-Yan过程的量子效应来探测ewimp。当最终态的双轻子不变质量接近EWIMP阈值,即EWIMP质量的两倍时,这种效应被增强。然而,在这样的质量区域中,我们必须仔细考虑非微扰效应,因为ewimp变得非相对论性,并且预测可能受到电弱相互作用引起的ewimp束缚态等因素的显著影响。我们利用ewimp的非相对论有效场论研究了这种非微扰效应,发现这些效应确实显著地影响了Drell-Yan过程的微分截面,尽管由于大型强子对撞机实验中轻子测量的能量分辨率有限,这种影响被模糊了。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nonperturbative effects on electroweakly interacting massive particles at hadron collider
Electroweakly Interacting Massive Particles (EWIMPs), in other words, new massive particles that are charged under the electroweak interaction of the Standard Model (SM), are often predicted in various new physics models. EWIMPs are probed at hadron collider experiments not only by observing their direct productions but also by measuring their quantum effects on Drell-Yan processes for SM lepton pair productions. Such effects are known to be enhanced especially when the di-lepton invariant mass of the final state is close to the EWIMP threshold, namely twice the EWIMP mass. In such a mass region, however, we have to carefully take non-perturbative effects into account, because the EWIMPs become non-relativistic and the prediction may be significantly affected by e.g., bound states of the EWIMPs caused by the electroweak interaction. We study such non-perturbative effects using the non-relativistic effective field theory of the EWIMPs, and found that those indeed affect the differential cross section of the Drell-Yan processes significantly, though the effects are smeared due to the finite energy resolution of the lepton measurement at the Large Hadron Collider experiment.
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