Search for the proton decay mode<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math>with KamLAND

Asakura, Kiyotaka; Gando, A.; Gando, Y.; Hachiya, Takahiko; Hayashida, S.; Ikeda, H.; Inoue, K.; Ishidoshiro, K.; Ishikawa, T.; Ishio, S.; Koga, M.; Matsuda, R.; Matsuda, Sumio; Mitsui, Tadao; Motoki, D.; Nakamura, K.; Obara, Shigeru; Oki, Y.; Oura, Toshiaki; Shimizu, I.; Shirahata, Y.; Shirai, J.; Suzuki, A.; Tachibana, Hideki; Tamae, K.; Ueshima, K.; Watanabe, Hiroko; Xu, B. D.; Yamauchi, Yoshiaki; Yoshida, H. P.; Kozlov, A.; Takemoto, Y.; Yoshida, S.; Fushimi, K.; Grant, C.; Piepke, A.; Banks, Thomas; Berger, B. E.; Freedman, S. J.; Fujikawa, B. K.; O’Donnell, T.; Learned, J. G.; Maricic, J.; Sakai, M.; Dazeley, S.; Svoboda, R.; Winslow, L. A.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.

doi:10.1103/physrevd.92.052006

Cited by 15 publications

(15 citation statements)

References 24 publications

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“…using our value of the gauge coupling constant g at the unification scale. At present, Super-Kamiokande has found that τ / Br(p → e + π 0 ) > 8.2 × 10 33 yr [23], and KamLAND has found that τ (p → νK + ) > 5.4 × 10 32 yr [24]. Thus the scenario of eq.…”

Section: A Gauge Unificationmentioning

confidence: 88%

Phenomenological analysis of an E6 -inspired seesaw model

Ellis

Volkas

2017

Phys. Rev. D

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We analyse the phenomenology of a model of neutrino masses inspired by unification into E6 in which the exotic neutrinos can be present at low scales. The model introduces vector-like isosinglet down-type quarks, vector-like isodoublet leptons, neutrino singlets and two Z bosons. The seesaw mechanism can be achieved with exotic neutrino masses as low as 100 GeV and Yukawa couplings of order 10 −3 . We find that the lightest Z boson mass is required to be above 2.8 TeV, the exotic quark masses are required to be above 1.3 TeV (810 GeV) if they are collider stable (promptly decaying), and the exotic lepton mass bounds remain at the lep value of 102 GeV. The model also presents a type-ii two-Higgs-doublet model (2hdm) along with two heavy singlet scalars. The 2hdm naturally has the alignment limit enforced thanks to the large vacuum expectation values of the exotic scalars, thereby avoiding most constraints.

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Section: A Gauge Unificationmentioning

confidence: 88%

Phenomenological analysis of an E6 -inspired seesaw model

Ellis

Volkas

2017

Phys. Rev. D

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“…The product of these interactions, after integrating out S, generate O 3 at tree level. 5 Thus, unless there is a strong hierarchy between the different Yukawa interactions, one expects that the treelevel contribution dominates the decay rate. One can eliminate such an unwanted hierarchy in couplings using additional symmetries.…”

Section: A General Discussionmentioning

confidence: 99%

“…where the subscripts 1 and 3 in Eqs. (4) and (5) indicate the electroweak SUð2Þ representation of the bilinears of the fermions. The contraction of all the indices on the operators is explicitly shown in Appendix.…”

Section: Proton Decay Operators At One Loopmentioning

confidence: 99%

“…While searches for proton decay so far have yielded only lower bounds on the lifetime of various possible decay modes [1][2][3][4][5][6][7][8][9][10], future large volume detectors, such as Hyper-Kamiokande [11], DUNE [12] and JUNO [13], or more speculative multimegaton proposals such as TITAND [14,15], MEMPHYS [16] or MICA [17,18] offer a good chance to finally discover this ultrarare process. Although nucleon decay processes are usually discussed in the context of grand unified theories (GUTs), see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 99%

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Proton decay at one loop

2019

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Proton decay is usually discussed in the context of grand unified theories. However, as is well known, in the standard model effective theory proton decay appears in the form of higher-dimensional nonrenormalizable operators. Here, we study systematically the one-loop decomposition of the d ¼ 6 B þ L violating operators. We exhaustively list the possible one-loop ultraviolet completions of these operators and discuss that, in general, two distinct classes of models appear. Models in the first class need an additional symmetry in order to avoid tree-level proton decay. These models necessarily contain a neutral particle, which could act as a dark matter candidate. For models in the second class the loop contribution dominates automatically over the tree-level proton decay, without the need for additional symmetries. We also discuss possible phenomenology of two example models, one from each class, and their possible connections to neutrino masses, LHC searches and dark matter.

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“…KamLAND is the first large scintillator detector to demonstrate the ability to search for these decays using PMT waveform data to identify the signal. Their search obtained a 44.4 ± 5.3% signal efficiency with a background rate of 101 ± 22 ev/Mton/yr [18]. No candidates were found in an 8.97 kton-yr exposure of the detector, resulting in a limit of τ p < 5.4 × 10 32 years (90% C.L.).…”

Section: Proton Decaymentioning

confidence: 98%

Atmospheric Neutrinos and Proton Decay

Wendell¹

2019

Proceedings of XXIX International Symposium on Lepton Photon Interactions at High Energies — PoS(LeptonPhoton2019)

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While there is as-yet no indication of proton decay, lifetime limits have been extended to new extremes prompting the construction of megaton-scale detectors. At the same time, efforts to understand the main background to such searches, atmospheric neutrinos, have yielded a variety of information on their masses, mixings, and even interactions with matter. This presentation discussed recent experimental results as well as expectations for the next generation of detectors in the study of atmospheric neutrinos and the search for proton decay.

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Search for the proton decay modep→ν¯K+with KamLAND

Cited by 15 publications

References 24 publications

Phenomenological analysis of an E6 -inspired seesaw model

Phenomenological analysis of an E6 -inspired seesaw model

Proton decay at one loop

Atmospheric Neutrinos and Proton Decay

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