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Prog. Theor. Phys. Vol. 98 No. 6 (1997) pp. 1385-1390
Letters
Dimension-Six Proton Decays in the Modified Missing Doublet SU(5) Model
Junji Hisano,
Yasunori Nomura* and
Tsutomu Yanagida*
Theory Group, High Energy Accelerator Research
Organization (KEK)
Tsukuba 305
*Department of Physics, University of Tokyo, Tokyo 113
(Received October 13, 1997)
Abstract:
Dimension-five operators for nucleon decays are suppressed
in the modified missing doublet (MMD) model in the supersymmetric SU(5)
grand unification.
We show that nonrenormalizable interactions decrease the unification scale
in the MMD model, causing a significant increase in the nucleon decay
rate of dimension-six operators.
We find that the theoretical lower bound on the proton lifetime
τ(p →\e+ π0) is within the observable range
at Super-Kamiokande.
URL :
http://ptp.ipap.jp/link?PTP/98/1385/
DOI : 10.1143/PTP.98.1385
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