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arXiv 2011.04821hep-phastro-ph.CO
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轻子介导的电弱重子生成、引力波和对撞机上的$4τ$末态

Lepton-mediated electroweak baryogenesis, gravitational waves and the $4τ$ final state at the collider

Ke-Pan Xie

摘要:

提出了一种由$τ$轻子输运介导的电弱重子生成机制。我们扩展了标准模型,引入了一个实单重标量$S$来触发强一阶电弱相变(SFOEWPT),并引入了一组5维亲轻子算符来提供足够的CP破坏源.我们证明了这个模型能够产生所观察到的宇宙重子不对称性。这种情况可以通过下一代天基探测器的SFOEWPT引力波信号或强子对撞机的$pp\to h^*\to SS\to 4τ$过程(其中$h^*$是壳外希格斯粒子)进行实验验证。一个详细的对撞机模拟表明,相当一部分的参数空间可以探测在HL-LHC,而几乎整个EWBG允许的参数空间可以达到27 TeV的HE-LHC。

英文摘要:

An electroweak baryogenesis (EWBG) mechanism mediated by $τ$ lepton transport is proposed. We extend the Standard Model with a real singlet scalar $S$ to trigger the strong first-order electroweak phase transition (SFOEWPT), and with a set of leptophilic dimension-5 operators to provide sufficient CP violating source. We demonstrate this model is able to generate the observed baryon asymmetry of the universe. This scenario is experimentally testable via either the SFOEWPT gravitational wave signals at the next-generation space-based detectors, or the $pp\to h^*\to SS\to 4τ$ process (where $h^*$ is an off-shell Higgs) at the hadron colliders. A detailed collider simulation shows that a considerable fraction of parameter space can be probed at the HL-LHC, while almost the whole parameter space allowed by EWBG can be reached by the 27 TeV HE-LHC.

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