A 30 min social hour at 11am with the seminar at 11:30am
Speaker: Matthias Schindler, University of South Carolina
Title: Nucleon-nucleon interactions and the large-Nc expansion: Applications to symmetry violations and neutrinoless double beta decay
Abstract: The large-Nc expansion of QCD can be applied to the nucleon-nucleon interactions. The relative sizes of different terms in a general parametrization of the standard nucleon-nucleon potential match reasonably well with large-Nc expectations. I will present extensions of this approach to parity- and time-reversal-invariance-violating interactions, magnetic and axial two-nucleon currents, and to two-nucleon operators contributing to neutrinoless double beta decay. In each case, the large-Nc expansion imposes constraints on the relative sizes of the low-energy coefficients that contribute to a given type of interaction. In the absence of sufficient data, these constraints may prove useful in guiding both experiment and theory in prioritizing where to focus our efforts to gain a better understanding of these interactions.