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arXiv 2202.13358hep-ph
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在强子和轻子对撞机上从$Z^\prime$产生重Majorana中微子对

Heavy Majorana neutrino pair production from $Z^\prime$ at hadron and lepton colliders

Arindam Das, Sanjoy Mandal, Takaaki Nomura, Sujay Shil

备注：
33 pages, 18 figures, matched with published version
发表信息：
Phys.Rev.D 105 (2022) 9, 095031
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摘要：

规范U $(1)$是标准模型（SM）的一种扩展，它是一个简单的、无反常的框架，引入三代Majorana型右手中微子（RHN），通过跷跷板机制产生轻中微子质量和味道混合。我们通过$Z^\prime$诱导的Majorana型RHN对的产生，在不同的强子和轻子对撞机上研究了这样的模型。我们推导出$(1)$规范耦合$(g^\prime)$的边界，比较不同$Z^\prime$质量$(M_{Z^\prime})$和RHN质量$(M_N)$的模型截面与实验观测数据。使用这些限制，我们估计允许的RHN对生产截面，这可以表现为轻子数违反签名与脂肪射流在强子对撞机取决于质量的RHN。因此，我们针对$M_{Z^\prime}$和$M_N$的不同基准值研究了信号脂肪喷射的双轻子和三轻子模式。利用脂肪喷流的特征，通过研究信号和相应的SM背景，我们估计了不同质心能量下$M_N-M_{Z^\prime}$平面上的边界，这些边界可以在不同的强子对撞机上探测到.在轻子对撞机的背景下，我们考虑的电子正电子初始状态，马约拉纳型RHN可以产生从$Z^\prime$表现出相同的符号双轻子加喷注签名和三轻子加喷注与丢失的能量。研究信号和相应的SM背景，我们估计的$M_N-M_{Z^\prime}$平面上的不同的质心能量的界限。在SM的U $(1)$扩展的上下文中，存在与RHN耦合的SM单重BSM标量。我们可以通过在正负电子对撞机上的BSM标量产生来探测RHN的Majorana性质。

英文摘要：

A gauged U$(1)$ extension of the Standard Model (SM) is a simple and anomaly free framework where three generations of Majorana type right-handed neutrinos (RHNs) are introduced to generate light neutrino mass and flavor mixings through the seesaw mechanism. We investigate such models at different hadron and lepton colliders via $Z^\prime$ induced Majorana type RHNs pair production. We derive bounds on U$(1)$ gauge coupling $(g^\prime)$ comparing the model cross sections with experimentally observed data for different $Z^\prime$ mass $(M_{Z^\prime})$ and RHNs mass $(M_N)$. Using these limits we estimate the allowed RHN pair production cross section which can be manifested by lepton number violating signatures in association with fat-jets at the hadron colliders depending on the mass of the RHNs. Hence we study dilepton and trilepton modes with fat-jet/s of the signal for different benchmark values of $M_{Z^\prime}$ and $M_N$. Using fat-jet signatures and studying the signal and corresponding SM backgrounds, we estimate bounds on $M_N-M_{Z^\prime}$ plane at different center of mass energies which could be probed at different hadron colliders. In the context of the lepton colliders we consider electron positron initial states where Majorana type RHNs can be produced from $Z^\prime$ manifesting same sign dilepton plus jets signature and trilepton plus jets in association with missing energy. Studying the signal and corresponding SM backgrounds we estimate the bounds on the $M_N-M_{Z^\prime}$ plane for different center of mass energies. In the context of U$(1)$ extension of the SM there is an SM singlet BSM scalar which couples with the RHNs. We can probe the Majorana nature of RHNs via this BSM scalar production at electron positron colliders.

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