Title: The landscape of baryon number violation


Abstract: Baryon number violation is possibly our most sensitive probe of physics beyond the Standard Model. For half a century, the theoretical and experimental focus has been on effective dimension-six operators which induce clean two-body nucleon decays. In this talk, I will emphasize that baryon number violation is much more than that. Even at mass dimension six, it is possible to end up with dominant three-body decays, and at higher mass dimension high-multiplicity final states become even more common. Weinberg has shown long ago that higher-dimensional operators could dominate over the d=6 ones if some linear combinations of baryon and lepton numbers are imposed as symmetries. I will show that some UV completions automatically come with such a symmetry, i.e. it emerges as an accidental symmetry. Some UV completions can even lead to accidentally-dominant operators that are not singled out by baryon and lepton numbers; these lead to genuine loop realizations of baryon-number-violating operators. Time permitting, I will also talk about light new physics in connection to baryon number violation.


https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09