Search for proton decay viap→νK+using260  kiloton·yeardata of Super-Kamiokande

Abstract

We have searched for proton decay via p → νK + using Super-Kamiokande data from April 1996 to February 2013, 260 kiloton·year exposure in total. No evidence for this proton decay mode is found. A lower limit of the proton lifetime is set to τ/B(p → νK + ) > 5.9 × 10 33 years at 90% confidence level.

Search for proton decay via p→e+π0 and p→μ+Abe1, Haga2, Hayato3 et al. 2017Phys. Rev. DSelf Cite19472090View full textAdd to dashboardCite

“…The decay rate prior probability distribution P (Γ) is 1 for Γ ≥ 0 and otherwise 0. P (λ i ), P (ǫ i ), and P (b i ) are the prior probability distributions for detector exposure, efficiency, and background, respectively, which are assumed to be Gaussian distributions with σ described in Table II [23]. The lower limit of the nucleon decay rate, Γ limit, is:…”

“…The proton decay simulation has been updated since the previous paper [23] by implementation of proton and neutron emission at deexcitation from s-state [24], and 7.5% of p → e + π 0 events in oxygen are accompanied by a neutron.…”

“…In Ref. [23], the proton lifetime was calculated combining different search methods as well as different run periods. The same .…”

Chances for SUSY-GUT in the LHC Epoch

“…After being dressed by gauginos, they induce proton decay dominantly via the channel p → K + ν. The experimental limit on the latter is quite stringent, namely τ p /Br (p → K + ν) > 5.9·10 33 yr at 90% confidence level [80]. This bound excludes the naive supersymmetric SU(5) model [81,82], which is however already excluded by the wrong prediction for the light quark masses.…”

Search for top squarks in final states with one isolated lepton, jets, and missing transverse momentum ins=13 TeVppAaboud1, Bergeås2, Brenner3 et al. 2016Phys. Rev. DSelf Cite540320View full textAdd to dashboardCite

“…For reasons such as gauge unification [15] and the two-loop radiative corrections to the Higgs boson mass [16,17], one may also expect a TeV mass scale for the gluino (g), the superpartner of the gluon. A common theoretical strategy for avoiding strong constraints from the nonobservation of proton decay [18] is to introduce a multiplicative quantum number called R parity. If R parity is conserved [19], SUSY particles are produced in pairs and the lightest supersymmetric particle (LSP) is stable.…”