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arXiv 2106.01362hep-phhep-ex
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在嗜中性$U(1)$模型中在LHC上搜索轻$Z^\prime$

Search for a light $Z^\prime$ at LHC in a neutrinophilic $U(1)$ model

Waleed Abdallah, Anjan Kumar Barik, Santosh Kumar Rai, Tousik Samui

摘要:

我们考虑一个亲中微子的$U(1)$扩展的标准模型(SM),它只耦合到SM的等单线态中性费米子,在新的群下收费。中性费米子通过汤川相互作用耦合到SM物质场。模型中的中微子从标准的反跷跷板机制获得质量,而增加的标量扇区负责规范$U(1)$的破缺,导致轻中性规范玻色子($Z'$),它与SM扇区的相互作用最小。我们研究的现象学有这样一个轻$Z'$的背景下,neutrinophilic相互作用,以及允许新的$U(1)$组与SM超荷组之间的动力学混合的作用。我们表明,目前的实验搜索允许一个非常轻的$Z'$,如果它不耦合到SM字段直接和突出的搜索策略在大型强子对撞机。我们观察到,$(4\ell + \slashed{E}_T)$和$(3\ell + 2j + \slashed{E}_T)$形式的多轻子末态可能是发现这样一个亲中微子规范玻色子躺在质量范围为$200$- $500$ GeV的关键。

英文摘要:

We consider a neutrinophilic $U(1)$ extension of the standard model (SM) which couples only to SM isosinglet neutral fermions, charged under the new group. The neutral fermions couple to the SM matter fields through Yukawa interactions. The neutrinos in the model get their masses from a standard inverse-seesaw mechanism while an added scalar sector is responsible for the breaking of the gauged $U(1)$ leading to a light neutral gauge boson ($Z'$), which has minimal interaction with the SM sector. We study the phenomenology of having such a light $Z'$ in the context of neutrinophilic interactions as well as the role of allowing kinetic mixing between the new $U(1)$ group with the SM hypercharge group. We show that current experimental searches allow for a very light $Z'$ if it does not couple to SM fields directly and highlight the search strategies at the LHC. We observe that multilepton final states in the form of $(4\ell + \slashed{E}_T)$ and $(3\ell + 2j + \slashed{E}_T)$ could be crucial in discovering such a neutrinophilic gauge boson lying in a mass range of $200$--$500$ GeV.

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