On proton Decay

概要

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The lifetime and branching ratios of the proton (and neutron) in the standard SU(5) grand unified theory are calculated by making use of a simple SU(6) symmetric quark model for nucleon structure and Kane and karl's three kinetic models for final mesons. The form-factor effects due to the finite sizes of the initial nucleon and final mesons are included. Though the form-factor effects reduce the pionic decay rates by about 50%, pionic decay modes (e^+π^0 +ν^^-_eπ^+) are still important (41〜46%). The p→e^+ω decay mode is sizable (25〜31%). The absolute magnitudes of the decay rates are fixed from nonleptonic decays of hyperons. We have found that 0.2×10^29 ≲ τ_p≲ 1×10^<30> y for 0.1⪇ Λ-__<ms> ⪇0.2 GeV while 0.4×10^<31> ⪇τp⪇ 1.5×10^<31> y for Λ-__<ms> =0.4 GeV if we use the relation between Λ-__<ms> and M_x, M_x=1.5×^<15>Λ-__<ms> .
理論物理学刊行会の論文
1982-08-25