Sayan Kar M. Sc. :1988, IIT, Kanpur Ph.D.: 1994, IIT, Kanpur; Postdoctoral : 1994-96,IOPB Research interest :Theoretical Particle Physics Present occupation: Faculty, Dept. of Physics, IIT,Kharagpur since 1998. Email : sayan@cts.iitkgp.ernet.in