Radiative muon capture and induced pseudoscalar coupling constant in nuclear matter

Radiative muon capture is studied to investigate the induced pseudoscalar coupling constant g(P) in nuclear matter. According to the recent TRIUMF experiment for mu(-)p --> nupsilon(mu)gamma, the g(P) was surprisingly larger than the value obtained from mu(-)p --> nupsilon(mu) experiment by as much as 44%. The result may affect seriously theoretical interpretations of the experimental results for the radiative muon captures in finite nuclei. In view of the recent TRIUMF result, the radiative muon capture in nuclear matter is revisited in a framework of the relativistic mean field theory.