Low energy restrictions for a flipped left-right symmetric model

I consider some low energy restrictions for a “flipped” left-right symmetric model containing exotic fermions ofE ₆ and a right-handedW-boson, all with oddR-parity. The new interactions due toW _R-exchange have no significant impact on rare kaon decays, because theW _R does not couple tod,s,b quarks. On the other hand,W _R exchanges might induce rare processes like (D - bar D) mixing, (D^0 to mu bar mu ,D^0 to mu bar e,mu to egamma ,mu to 3e) , and μN→eN. It turns out that the strongest bound is obtained from (D - bar D) mixing. With reasonable extra assumptions, it is found that the exotic right-handed W-boson is likely to be heavier than 500 to 1500 GeV.