Neutrino absorption by W production in the presence of a magnetic field
  In this work we calculate the decay rate of the electron type neutrinos into $W$ bosons and electrons in presence of an external uniform magnetic field. The decay rate is calculated from the imaginary part of the $W$ exchange neutrino self-energy diagram but in the weak field limit and compare our result with the existing one. 
Kaushik Bhattacharya, Sarira Sahu