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arXiv 1801.09080hep-ph
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简单标准模型的重荷标量推广

Simple Standard Model Extension by Heavy Charged Scalar

Edward Boos, Igor Volobuev

摘要:

本文考虑仅在$U_{Y}(1)$弱超荷规范群下规范的重荷标量对标准模型的推广。这样的扩展,是规范不变的SM规范群,是一个简单的特殊情况下,众所周知的Zee模型。由于带电标量与标准模型费米子的相互作用与标准模型的相互作用相比被显著抑制,带电标量提供了一个长寿命带电粒子的例子,值得在LHC中寻找。给出了不同对撞机下带电标量的成对和单个产生截面以及不同玻色子质量下可能的衰变宽度。结果表明,目前ATLAS和CMS在8 TeV和13 TeV碰撞能量下的搜索,导致标量玻色子质量的边界约为300- 320 GeV。的限制预计将更大的碰撞能量更高,并假设$15~ab^{-1}$积分亮度,达到约2.7 TeV在未来的27 TeV的大型强子对撞机,从而覆盖最有趣的质量区域。

英文摘要:

We consider a Standard Model extension by a heavy charged scalar gauged only under the $U_{Y}(1)$ weak hypercharge gauge group. Such an extension, being gauge invariant with respect to the SM gauge group, is a simple special case of the well known Zee model. Since the interactions of the charged scalar with the Standard Model fermions turn out to be significantly suppressed compared to the Standard Model interactions, the charged scalar provides an example of a long-lived charged particle being interesting to search for at the LHC. We present the pair and single production cross sections of the charged scalar at different colliders and the possible decay widths for various boson masses. It is shown that the current ATLAS and CMS searches at 8 and 13 TeV collision energy lead to the bounds on the scalar boson mass of about 300--320 GeV. The limits are expected to be much larger for higher collision energies and, assuming $15~ab^{-1}$ integrated luminosity, reach about 2.7 TeV at future 27 TeV LHC thus covering the most interesting mass region.

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