Time-reversal-invariance-violating nucleon-nucleon potential in the 1/N_c expansion

Understand

We apply the large-$N_c$ expansion to the time-reversal-invariance-violating (TV) nucleon-nucleon potential.

• The operator structures contributing to next-to-next-to-leading order in the large-$N_c$ counting are constructed.
• For the TV and parity-violating case we find a single operator structure at leading order.
• The TV but parity-conserving potential contains two leading-order terms, which however are suppressed by 1/$N_c$ compared to the parity-violating potential.