Effect of an RRRR dimension 5 operator on the proton decay in the minimal SU(5) SUGRA GUT model

نویسندگان

  • Toru Goto
  • Takeshi Nihei
چکیده

We reanalyze the proton decay in the minimal SU(5) SUGRA GUT model. Unlike previous analyses, we take into account a Higgsino dressing diagram of dimension 5 operator with right-handed matter fields (RRRR operator). It is shown that this diagram gives a dominant contribution for p → Kντ over that from LLLL operator, and decay rate of this mode can be comparable with that of p → Kνμ which is dominated by the LLLL contribution. It is found that we cannot reduce both the decay rate of p → Kντ and that of p → Kνμ simultaneously by adjusting relative phases between Yukawa couplings at colored Higgs interactions. Constraints on the colored Higgs mass MC and a typical squark and slepton mass mf̃ from Super-Kamiokande limit become considerably stronger due to the Higgsino dressing diagram of the RRRR operator: MC > 6.5× 10 GeV for mf̃ < 1 TeV, and mf̃ > 2.5 TeV for MC < 2.5× 10 GeV.

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تاریخ انتشار 1999