Nucleon decay matrix elements with the Wilson quark action: an update
/ Authors
S. Aoki, M. Fukugita, S. Hashimoto, K. Ishikawa, N. Ishizuka, Y. Iwasaki, K. Kanaya, T. Kaneda, S. Kaya, Y. Kuramashi
and 7 more authors
M. Okawa, T. Onogi, S. Tominaga, N. Tsutsui, A. Ukawa, N. Yamada, T. Yoshi'e
/ Abstract
Abstract We present preliminary results of a new lattice computation of hadronic matrix elements of baryon number violating operators which appear in the low-energy effective Lagrangian of (SUSY-)Grand Unified Theories. The contribution of irrelevant form factor which has caused an underestimate of the matrix elements in previous studies is subtracted in this calculation. Our results are 2∼4 times larger than the most conservative values often employed in phenomenological analyses of nucleon decay with specific GUT models.