Abstract: Baryon number violation (BNV) is well-motivated by the BSM physics. Usually, the $\Delta B=1$ nucleon decay is predicted with the NP scale being pushed around the GUT scale unaccessible directly for the current collider experiments. However, there exist TeV scale NP scenarios in which the $\Delta B=1$ processes are suppressed but that of the $\Delta B=2$ are dominant. In this latter case, I will take an effective field theory approach to discuss the $ \Delta B=\Delta L=-2$ dinucleon to dilepton decays in nuclei $ \left(p p \rightarrow \ell^{+} \ell^{\prime+}, p n \rightarrow \ell^{+} \bar{\nu}^{\prime}, n n \rightarrow \bar{\nu} \bar{\nu}^{\prime}\right)$. In addition, I will also discuss the exotic $\Delta B=2$ neutron decay mode  $n \rightarrow \bar{p} e^{+} \chi$ which has been overlooked in the past.

 

Contact person: Jiang-Hao Yu