Experimental limits on nucleon lifetime for lepton+meson decay modes

Hirata, Keiko; Kajita, T.; Kifune, T.; Kihara, K.; Nakahata, M.; Nakamura, K.; Ōhara, S.; Oyama, Y.; Sato, Nobuaki; Takita, M.; Totsuka, Y.; Yanagimoto, Yoshitomo; Mori, M.; Suzuki, A.; Takahashi, K.; Tanimori, T.; Yamada, M.; Koshiba, M.; Suda, T.; Miyano, K.; Miyata, H.; Takei, H.; Kaneyuki, K.; Nagashima, Yoshihiko; Suzuki, Y.; Beier, E. W.; Feldscher, L. R.; Frank, E.D.; Frati, W.; Kim, S.B.; Mann, A. K.; Newcomer, F. M.; Berg, R. Van; Zhang, W.

doi:10.1016/0370-2693(89)90058-0

Cited by 83 publications

(47 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However recent experimental limits on p → e + π 0 [2][3][4] and p →νK + [5] have already ruled out the simplest B − L conserving GUTs, minimal SU (5) and the minimal supersymmetric version of SU (5), where L stands for lepton number. It has also been shown that any B − L conserving baryon asymmetry generated in the early universe (above 10 TeV scale) should be washed out until now by the triangle anomalies involving electro-weak bosons.…”

Section: Introductionmentioning

confidence: 99%

Search forn−n¯oscillation in Super-Kamiokande

Abe¹,

Hayato²,

Iida³

et al. 2015

Phys. Rev. D

Self Cite

133

177

View full text Add to dashboard Cite

2A search for neutron-antineutron (n −n) oscillation was undertaken in Super-Kamiokande using the 1,489 day livetime or 2.45 × 10 34 neutron-year exposure data. This process violates both baryon and (baryon−lepton) numbers by two units and is predicted by a large class of hypothetical models where the seesaw mechanism is incorporated to explain the observed tiny neutrino masses and the matter-antimatter asymmetry in the universe. No evidence for n −n oscillation was found, the lower limit of the lifetime for neutrons bound in 16 O, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be 1.9 × 10 32 years at the 90% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be 2.7 × 10 8 s using a theoretical value of the nuclear suppression factor of 0.517 × 10 23 s −1 and its uncertainty.

show abstract

Section: Introductionmentioning

confidence: 99%

Search forn−n¯oscillation in Super-Kamiokande

Abe¹,

Hayato²,

Iida³

et al. 2015

Phys. Rev. D

Self Cite

133

177

View full text Add to dashboard Cite

show abstract

“…The favored gauge-mediated decay mode in many GUTs is p → e + π 0 . In the minimal SU(5) GUT, the predicted proton lifetime to e + π 0 is 10 31±1 years, which has been ruled out by experimental results from IMB [2], Kamiokande [3], and SuperKamiokande [4]. GUT models incorporating supersymmetry [6] (SUSY-GUTs) raise the GUT scale [7], suppressing the decay rate of p → e + π 0 , thereby allowing compatibility with the experimental limit.…”

mentioning

confidence: 99%

“…In the SUSY SU(5) GUT with minimal assumptions and TeV scale SUSY particles, the partial proton lifetime to νK + is less than 10 31 years [9], which has also been excluded by previously published experimental constraints [2,3,5]. Nonminimal SUSY SU(5) GUTs [11] or SUSY GUTs based on SO(10) [12] have been constructed that evade this limit, yet still predict partial lifetimes in the range 10 32 to 10 35 years, with some particular models that require the lifetime be less than a few times 10 34 years.…”

mentioning

confidence: 99%

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

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…This type of interaction can lead to baryon number violating nucleon decays. The simplest GUT, minimal SU(5) [1], predicts the partial lifetime of a proton via the mode p → e + π 0 to be ∼ 10 31±1 years [2,3], which was excluded by the IMB and KAMIOKANDE experiments [4,5].…”

mentioning

confidence: 99%

Search for nucleon decay into charged antilepton plus meson in Super-Kamiokande I and II

Nishino¹,

Abe²,

Hayato³

et al. 2012

Phys. Rev. D

Self Cite

101

View full text Add to dashboard Cite

Searches for a nucleon decay into a charged anti-lepton (e + or µ + ) plus a light meson (π 0 , π − , η, ρ 0 , ρ − , ω) were performed using the Super-Kamiokande I and II data. Twelve nucleon decay modes were searched for. The total exposure is 140.9 kiloton·years, which includes a 91.7 kiloton·year exposure (1489.2 live days) of Super-Kamiokande-I and a 49.2 kiloton·year exposure (798.6 live days) of Super-Kamiokande-II. The number of candidate events in the data was consistent with the atmospheric neutrino background expectation. No significant evidence for a nucleon decay was observed in the data. Thus, lower limits on the nucleon partial lifetime at 90% confidence level were obtained. The limits range from 3.6 × 10 31 to 8.2 × 10 33 years, depending on the decay modes.

show abstract

Experimental limits on nucleon lifetime for lepton+meson decay modes

Cited by 83 publications

References 18 publications

Search forn−n¯oscillation in Super-Kamiokande

Search forn−n¯oscillation in Super-Kamiokande

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

Search for nucleon decay into charged antilepton plus meson in Super-Kamiokande I and II

Contact Info

Product

Resources

About