大额外维左右对称模型中核子和双核子衰变到轻子末态
Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions
摘要：
在大额外维左右对称模型下，研究了重子数破坏的核子和双核子衰变到轻子末态的过程。具体地说，我们研究了（a）核子与$ΔB=-1$和$ΔL=-3$的三轻子衰变，以及（b）双核子与$ΔB=-2$和$ΔL=-2$的双轻子衰变。在LRS模型中，$B-L$被测量，并被希格斯真空期望值$v_R$自发打破，该期望值表征了违反$B-L$的过程发生的尺度。我们表明，连同$v_R$从实验限制$n$ - $\bar n$振荡的下限，从搜索其他核子衰变模式的约束意味着这些核子的三轻子和双核子双轻子衰变模式在这个模型中的充分抑制，以符合实验界限。
英文摘要：
We consider baryon-number-violating nucleon and dinucleon decays to leptonic final states in the context of a left-right symmetric (LRS) model with large extra dimensions. Specifically, we study (a) nucleon to trilepton decays with $ΔB=-1$ and $ΔL=-3$, and (b) dinucleon to dilepton decays with $ΔB=-2$ and $ΔL=-2$. In the LRS model, $B-L$ is gauged and is spontaneously broken by a Higgs vacuum expectation value $v_R$, which characterizes the scale at which processes violating $B-L$ occur. We show that together with the lower bound on $v_R$ from experimental limits on $n$-$\bar n$ oscillations, constraints from searches for other nucleon decay modes imply sufficient suppression of these nucleon to trilepton and dinucleon to dilepton decay modes in this model to agree with experimental bounds.
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