Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Takhistov, Volodymyr; Abe, K.; Haga, Y.; Hayato, Y.; Ikeda, M.; Iyogi, K.; Kameda, J.; Kishimoto, Y.; Miura, M.; Moriyama, S.; Nakahata, M.; Nakajima, Tetsuo; Nakano, Y.; Nakayama, S.; Orii, A.; Sekiya, H.; Shiozawa, M.; Takeda, Atsushi; Tanaka, H.; Tomura, T.; Wendell, R.; Irvine, T. J.; Kajita, T.; Kametani, I.; Kaneyuki, K.; Nishimura, Y.; Richard, E.; Okumura, K.; Labarga, L.; Fernández, P.; Gustafson, J.; Kachulis, C.; Kearns, E.; Raaf, J. L.; Stone, J. L.; Sulak, L.; Berkman, S.; Nantais, C.; Tanaka, Hirohisa; Tobayama, S.; Goldhaber, M.; Carminati, G.; Kropp, W. R.; Mine, S.; Weatherly, P.; Renshaw, A.; Smy, M. B.; Sobel, H. W.; Ganezer, K. S.; Hartfiel, B. L.; Hill, J.; Hồng, Nguyễn Thị; Kim, J. Y.; Lim, I. T.; Himmel, A.; Li, Z.; Scholberg, K.; Walter, C. W.; Wongjirad, T.; Ishizuka, T.; Tasaka, S.; Jang, J. S.; Learned, J. G.; Matsuno, S.; Smith, S. N.; Friend, M.; Hasegawa, T.; Ishida, Toru; Ishii, T.; Kobayashi, T.; Nakadaira, T.; Nakamura, Kenzo; Oyama, Y.; Sakashita, K.; Sekiguchi, T.; Tsukamoto, T.; Suzuki, A.; Takeuchi, Y.; Yano, T.; Hirota, S.; Huang, K.; Ieki, K.; Kikawa, T.; Minamino, A.; Nakaya, T.; Suzuki, K.; Takahashi, Sentaro; Fukuda, Y.; Choi, K.; Itow, Y.; Suzuki, T.; Mijakowski, P.; Frankiewicz, K.; Hignight, J.; Imber, J.; Jung, C. K.; Li, X.; Palomino, J. L.; Wilking, M. J.; Yanagisawa, C.; Ishino, H.; Kayano, T.; Kibayashi, A.; Koshio, Y.; Mori, Takaaki; Sakuda, M.; Kuno, Y.; Tacik, R.; Kim, S. B.; Okazawa, H.; Choi, Y.; Nishijima, K.; Koshiba, M.; Suda, Y.; Totsuka, Y.; Yokoyama, M.; Bronner, C.; Hartz, M.; Martens, K.; Marti, Ll.; Suzuki, Y.; Vagins, M. R.; Martin, J. F.; Perio, P. de; Konaka, A.; Chen, S.; Zhang, Y.; Wilkes, R. J.

doi:10.1103/physrevlett.115.121803

Cited by 33 publications

(38 citation statements)

References 41 publications

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“…6 In the right-most column of Table II, we list our estimates for the lower bounds on n →νγ obtained by combining the relation (10) with the experimental lower bounds given in the middle column. As is again evident from this table, our approximate lower bounds on (τ /B) n→νγ using the experimental limits on n →νπ 0 and n →νη are stronger than the bound from a direct experimental search, which is (τ /B) n→νγ > 0.550 × 10 33 yr [15].…”

Section: Effective Lagrangianmentioning

confidence: 65%

Improved lower bounds on partial lifetimes for nucleon decay modes

Girmohanta¹,

Shrock²

2019

Phys. Rev. D

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In the framework of a baryon-number-violating effective Lagrangian, we calculate improved lower bounds on partial lifetimes for proton and bound neutron decays, including p → ℓ + ℓ ′+ ℓ ′− , n → νℓ + ℓ ′− , p → ℓ + νν, and n →ννν, where ℓ and ℓ ′ denote e or µ, with both ℓ = ℓ ′ and ℓ = ℓ ′ cases. Our lower bounds are substantially stronger than the corresponding lower bounds from direct experimental searches. We also present lower bounds on (τ /B) p→ℓ + γ , (τ /B)n→νγ, (τ /B) p→ℓ + γγ , and (τ /B)n→νγγ . Our method relies on relating the rates for these decay modes to the rates for decay modes of the form p → ℓ + M and n →νM , where M is a pseudoscalar or vector meson, and then using the experimental lower bounds on the partial lifetimes for these latter decays.

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Section: Effective Lagrangianmentioning

confidence: 65%

Improved lower bounds on partial lifetimes for nucleon decay modes

Girmohanta¹,

Shrock²

2019

Phys. Rev. D

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“…Several of the classes of integrals for np → ℓ +ν are the same as those for pp → ℓ + ν decays, which we have already analyzed. These are the C (N N ′ ) k with k = 7, 13,15,16,17,19. For the other classes, we calculate the integrals…”

Section: ∆L = −2 Dinucleon Decays To Dileptons: General Operatomentioning

confidence: 99%

Baryon-number-violating nucleon and dinucleon decays in a model with large extra dimensions

Girmohanta

Shrock

2020

Phys. Rev. D

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It is known that limits on baryon-violating nucleon decays do not, in general, imply corresponding suppression of n −n transitions. In the context of a model with fermions propagating in higher dimensions, we investigate a related question, namely the implications of limits on ∆L = −1 proton and bound neutron decays mediated by four-fermion operators for rates of nucleon decays mediated by k-fermion operators with k = 6 and k = 8. These include a variety of nucleon and dinucleon decays to dilepton and trilepton final states with ∆L = −3, −2, 1, and 2. We carry out a lowenergy effective field theory analysis of relevant operators for these decays and show that, in this extra-dimensional model, the rates for these decays are strongly suppressed and hence are in accord with experimental limits.

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“…The SK experiment has reported the limits [19] (τ /B) np→e + x > 2.6 × 10 32 yr (31) and (τ /B) np→µ + x > 2.2 × 10 32 yr (32)…”

Section: Dinucleon Decays To Dilepton Final Statesmentioning

confidence: 99%

“…[18] carried out such an analysis and obtained a lower bound (τ /B) np→τ +ν τ > 1 × 10 30 yr per 16 O nucleus. Subsequently, from a direct search, SK obtained the limit [19] (τ /B) np→τ + x > 2.9 × 10 31 yr (33)…”

Section: Dinucleon Decays To Dilepton Final Statesmentioning

confidence: 99%

Improved upper limits on baryon-number violating dinucleon decays to dileptons

Girmohanta

Shrock

2020

Physics Letters B

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We consider effects of n −n oscillations and resultant matter instability due to dinucleons decays. We point out that existing upper bounds on the rates for the dinucleon decays nn → 2π 0 , nn → π + π − , and np → π + π 0 imply upper bounds on the rates for dinucleon decays to dileptons nn → e + e − , nn → µ + µ − , nn → ν ℓνℓ , and np → ℓ + ν ℓ , where ℓ = e, µ, τ . We present estimates for these upper bounds. Our bounds are substantially stronger than corresponding limits from direct searches.

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Search for Nucleon and Dinucleon Decays with an Invisible Particle and a Charged Lepton in the Final State at the Super-Kamiokande Experiment

Cited by 33 publications

References 41 publications

Improved lower bounds on partial lifetimes for nucleon decay modes

Improved lower bounds on partial lifetimes for nucleon decay modes

Baryon-number-violating nucleon and dinucleon decays in a model with large extra dimensions

Improved upper limits on baryon-number violating dinucleon decays to dileptons

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