Search for proton decay via<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>μ</mml:mi><mml:mo mathvariant="bold">+</mml:mo></mml:msup><mml:msup><mml:mi>K</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>in Super-Kamiokande I, II, and III

Regis, C.; Abe, K.; Hayato, Y.; Iyogi, K.; Kameda, J.; Koshio, Y.; Marti, Ll.; Miura, M.; Moriyama, S.; Nakahata, M.; Nakayama, S.; Obayashi, Y.; Sekiya, H.; Shiozawa, M.; Suzuki, Y.; Takeda, Atsushi; Takenaga, Y.; Ueno, K.; Yokozawa, T.; Kaji, Hiroshi; Kajita, T.; Kaneyuki, K.; Lee, K. P.; Okumura, K.; Mclachlan, T. C.; Labarga, L.; Kearns, E.; Raaf, J. L.; Stone, James L.; Sulak, L.; Goldhaber, M.; Bays, K.; Carminati, G.; Kropp, W. R.; Mine, S.; Renshaw, A.; Smy, M. B.; Sobel, H. W.; Ganezer, K. S.; Hill, J.; Keig, W. E.; Jang, J. S.; Kim, J. Y.; Lim, I. T.; Albert, J.; Scholberg, K.; Walter, C. W.; Wendell, R.; Wongjirad, T.; Ishizuka, T.; Tasaka, S.; Learned, J. G.; Matsuno, S.; Smith, S. N.; Hasegawa, T.; Ishida, Toru; Ishii, T.; Kobayashi, T.; Nakadaira, T.; Nakamura, Kenzo; Nishikawa, K.; Oyama, Y.; Sakashita, K.; Sekiguchi, T.; Tsukamoto, T.; Suzuki, A.; Takeuchi, Y.; Ieki, K.; Ikeda, M.; Kubo, H.; Minamino, A.; Murakami, Akira; Nakaya, T.; Fukuda, Y.; Choi, K.; Itow, Y.; Mitsuka, G.; Miyake, Masao; Mijakowski, P.; Hignight, J.; Imber, J.; Jung, C. K.; Taylor, Ian; Yanagisawa, C.; Ishino, H.; Kibayashi, A.; Mori, Takaaki; Sakuda, M.; Takeuchi, J.; Kuno, Y.; Kim, S. B.; Okazawa, H.; Choi, Y.; Nishijima, K.; Koshiba, M.; Totsuka, Y.; Yokoyama, M.; Martens, K.; Vagins, M. R.; Chen, S.; Sui, H.; Yang, Z.; Zhang, H.; Connolly, K.; Dziomba, M.; Wilkes, R. J.

doi:10.1103/physrevd.86.012006

Cited by 44 publications

(28 citation statements)

References 35 publications

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“…The conservation of baryon number and lepton number can be violated in SUSY models, resulting in a proton lifetime shorter than current experimental limits [27]. This is commonly resolved by introducing a multiplicative quantum number called R-parity, which is 1 and −1 for all SM and SUSY particles (sparticles), respectively.…”

Section: Introductionmentioning

confidence: 99%

Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of $$ \sqrt{s}=13 $$ TeV pp collision data with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2018

J. High Energ. Phys.

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The results of a search for the direct pair production of top squarks, the supersymmetric partner of the top quark, in final states with one isolated electron or muon, several energetic jets, and missing transverse momentum are reported. The analysis also targets spin-0 mediator models, where the mediator decays into a pair of dark-matter particles and is produced in association with a pair of top quarks. The search uses data from proton-proton collisions delivered by the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of √ s = 13 TeV and recorded by the ATLAS detector, corresponding to an integrated luminosity of 36 fb −1 . A wide range of signal scenarios with different mass-splittings between the top squark, the lightest neutralino and possible intermediate supersymmetric particles are considered, including cases where the W bosons or the top quarks produced in the decay chain are offshell. No significant excess over the Standard Model prediction is observed. The null results are used to set exclusion limits at 95% confidence level in several supersymmetry benchmark models. For pair-produced top-squarks decaying into top quarks, top-squark masses up to 940 GeV are excluded. Stringent exclusion limits are also derived for all other considered top-squark decay scenarios. For the spin-0 mediator models, upper limits are set on the visible cross-section.The search presented is based on 16 dedicated analyses that target the various scenarios mentioned above. Each of these analyses corresponds to a set of event selection criteria, referred to as a signal region (SR), and is optimised to target one or more signal scenarios. Two different analysis techniques are employed in the definition of the SRs, which are referred to as 'cut-and-count' and 'shape-fit'. The former is based on counting events in a single region of phase space, and is employed in the 16 analyses. The latter is used in some SRs in addition to the 'cut-and-count' technique and employs SRs split into multiple bins in a specific discriminating kinematic variable, that can cover a range that is larger than the 'cut-and-count' SR. By utilising different signal-to-background ratios in the various bins, the search sensitivity is enhanced in challenging scenarios where it is particularly difficult to separate signal from background.The main background processes after the signal selections include tt, single-top Wt, tt + Z(→ νν), and W+jets. Each of those SM processes are estimated by building dedicated control regions (CRs) enhanced in each of the processes, making the analysis more robust against potential mis-modelling effects in simulated events and reducing the uncertainties in the background estimates. The backgrounds are then simultaneously normalised in data using a likelihood fit for each SR with its associated CRs. The background modelling as predicted by the fits is tested in a series of validation regions (VRs). ATLAS detector and data collectionThe ATLAS detector [82] is a multipurpose particle physics detector with nearly 4π co...

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Section: Introductionmentioning

confidence: 99%

Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of $$ \sqrt{s}=13 $$ TeV pp collision data with the ATLAS detector

Aaboud

Aad

Abbott

et al. 2018

J. High Energ. Phys.

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“…The full procedure is detailed in the following subsections. More information on reconstruction can be found in papers ( [85]), theses ([46] and [86]), and proceedings ( [87]). …”

Section: Reconstructionmentioning

confidence: 99%

“…Only fully contained events have been used (so far) in T2K analysis, so PC and UPMU events will be ignored for now. For more information on all reduction processes, see [85], [61], [46], and [86].…”

Section: Atmospheric Reductionmentioning

confidence: 99%

Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

Abe¹,

Abgrall²,

Ajima³

et al. 2011

Phys. Rev. Lett.

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1,196

627

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T2K (Tokai to Kamioka) is a long baseline neutrino experiment with the primary goal of measuring the neutrino mixing angle θ 13 . It uses a muon neutrino beam, produced at the J-PARC accelerator facility in Tokai, sent through a near detector complex on its way to the far detector, Super-Kamiokande. Appearance of electron neutrinos at the far detector due to oscillation is used to measure the value of θ 13 .

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“…Using the results of Ref. [47] for the case of heavy Majorana neutrinos and updated with the latest experimental limit τ /B(p → K 0 µ + ) > 1.3 × 10 33 yr [49], we obtain m a < 330 neV. Similarly, from the projections at HK (10 years data taking [2]) in the p → K + ν channel we estimate m a < 160 neV.…”

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confidence: 59%

Axion mass prediction from minimal grand unification

2018

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We propose a minimal realization of the Peccei Quinn mechanism in a realistic SU(5) model, where the axion mass is directly connected to the grand-unification scale. By taking into account constraints from proton decay, collider searches and gauge coupling unification, we predict the axion mass: ma ∈ [4.8, 6.6] neV. The upper bound can be relaxed up to ma < 330 neV, at the cost of tuning the flavour structure of the proton decay operators. The predicted mass window will be complementarily probed by the axion dark matter experiments ABRACADABRA and CASPER-Electric, which could provide an indirect evidence for the scale of grand unification before the observation of proton decay.

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Search for proton decay viap→μ+K0in Super-Kamiokande I, II, and III

Cited by 44 publications

References 35 publications

Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of $$ \sqrt{s}=13 $$ TeV pp collision data with the ATLAS detector

Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb−1 of $$ \sqrt{s}=13 $$ TeV pp collision data with the ATLAS detector

Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

Axion mass prediction from minimal grand unification

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