arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节（Veterans Day），12 日无更新
arXiv 1504.01074hep-ph
收藏

在LHC上具有类矢量费米子的额外中性标量

Extra Neutral Scalars with Vector-like Fermions at the LHC

Shrihari Gopalakrishna, Tuhin Subhra Mukherjee, Soumya Sadhukhan

备注：
29 pages, 31 figures; v2: both CP-even and CP-odd scalars included, sections reorganized to improve readability, tanβ convention changed, new references added
发表信息：
Phys. Rev. D 93, 055004 (2016)
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

许多超越标准模型（BSM）的理论包含新的CP-奇和CP-偶中性标量$ϕ= \{A,H\}$，以及新的类矢量费米子（$ψ_{VL}$）。CP-奇标量$A$与两个标准模型规范玻色子的耦合在CP-守恒扇区中不能从可重整化算符发生，但可以在量子圈水平上诱导。我们计算这些有效的耦合在1圈水平引起的SM费米子和矢量类费米子，目前的解析表达式，并绘制它们的数值。利用8~TeV大型强子对撞机（LHC）$γγ$、$τ^{+} τ^{-}$和$t \bar t$通道数据，导出了$ϕ$与标准模型规范玻色子和费米子有效耦合的约束条件.本文给出了$ϕ$在8~和14~TeV LHC上的胶子熔合通道截面，以及它分支成SM费米子和规范玻色子对的比率。我们提出我们的结果第一模型独立，然后也为一些简单的模型，包含$ϕ$和$ψ_{VL}$的单重态和双重态表示的$SU(2)$。在二重态的情况下，我们主要讨论了在对准极限下的两个Higgs二重态（2 HDM）的II型和X型模型。

英文摘要：

Many theories beyond the standard model (BSM) contain new CP-odd and CP-even neutral scalars $ϕ= \{A,H\}$, and new vector-like fermions ($ψ_{VL}$). The couplings of the CP-odd scalar $A$ to two standard model (SM) gauge bosons cannot occur from renormalizable operators in a CP-conserving sector, but can be induced at the quantum loop level. We compute these effective couplings at the 1-loop level induced by the SM fermions and vector-like fermions, present analytical expressions for them, and plot them numerically. Using the 8~TeV Large Hadron Collider (LHC) $γγ$, $τ^{+} τ^{-}$ and $t \bar t$ channel data, we derive constraints on the effective couplings of the $ϕ$ to standard model gauge bosons and fermions. We present the gluon-fusion channel cross-sections of the $ϕ$ at the 8~and~14~TeV LHC, and its branching-ratios into SM fermion and gauge-boson pairs. We present our results first model-independently, and then also for some simple models containing $ϕ$ and $ψ_{VL}$ in the singlet and doublet representations of $SU(2)$. In the doublet case, we focus on the two-Higgs-doublet (2HDM) Type-II and Type-X models in the alignment limit.

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。

↑