Further Evidence for the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">K</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi /><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>ν</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></

Adler, S. S.; Bazarko, A. O.; Bergbusch, P. C.; Blackmore, E. W.; Bryman, D. A.; Chen, S.; Chiang, I. H.; Diwan, M. V.; Frank, J. S.; Haggerty, J. S.; Hu, J.; Inagaki, T.; Ito, M.; Jain, V.; Kabe, S.; Kettell, S. H.; Kitching, P.; Kobayashi, M.; Komatsubara, T. K.; Konaka, A.; Kuno, Y.; Kuriki, M.; Li, K. K.; Littenberg, L.; Macdonald, J. A.; Meyers, P. D.; Mildenberger, J.; Miyajima, M.; Muramatsu, N.; Nakano, Takashi; Ng, C.; Ng, Sam Yanwing; Numao, T.; Poutissou, J. M.; Poutissou, R.; Redlinger, G.; Sato, Takahiro; Shimada, Kenji; Shimoyama, Takefumi; Shinkawa, T.; Shoemaker, F. C.; Stone, J. R.; Strand, R. C.; Sugimoto, S.; Tamagawa, Y.; Witzig, C.; Yoshimura, Y.

doi:10.1103/physrevlett.88.041803

Cited by 134 publications

(55 citation statements)

References 11 publications

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“…Limits in the low mass range come from a re-interpretation by theorists of old results from the LSND [210] and E137 [194] experiments, and as such, should be taken with many caveats. A re-analysis of electron-scattering data from direct detection experiments has led to constraints in the sub-GeV DM region [211,212] (a) Plane versus m A Figure 21 shows the current 90% CL upper limits in the plane versus m A from BaBar [209], E787/E949 [213,214] and NA64 [67] as filled areas and future perspectives from projects not PBC related as solid or dashed curves. The region preferred by the (g − 2) µ puzzle [215] is also shown in the plot.…”

Section: Current Bounds and Future Experimental Landscapementioning

confidence: 99%

Physics beyond colliders at CERN: beyond the Standard Model working group report

Beacham

Burrage

Curtin

et al. 2019

J. Phys. G: Nucl. Part. Phys.

475

628

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The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of the CERN's accelerator complex and scientific infrastructures through projects complementary to the LHC and other possible future colliders. These projects will target fundamental physics questions in modern particle physics.ii 7 Physics reach of PBC projects 66 8 Physics reach of PBC projects in the sub-eV mass range 66 8.1 Axion portal with photon dominance (BC9) 66 9 Physics reach of PBC projects in the MeV-GeV mass range 73 9.1 Vector Portal 78 9.1.1 Minimal Dark Photon model (BC1) 78 9.1.2 Dark Photon decaying to invisible final states (BC2) 83 9.1.3 Milli-charged particles (BC3) 90 9.2 Scalar Portal 93 9.2.1 Dark scalar mixing with the Higgs (BC4 and BC5) 93 9.3 Neutrino Portal 97 9.3.1 Neutrino portal with electron-flavor dominance (BC6) 98 9.3.2 Neutrino portal with muon-flavor dominance (BC7) 101 9.3.3 Neutrino portal with tau-flavor dominance (BC8) 103 9.4 Axion Portal 106 9.4.1 Axion portal with photon-coupling (BC9) 106 9.4.2 Axion portal with fermion-coupling (BC10) 110 9.4.3 Axion portal with gluon-coupling (BC11) 113 10 Physics reach of PBC projects in the multi-TeV mass range 115 10.1 Measurement of EDMs as probe of NP in the multi TeV scale 115 10.2 Experiments sensitive to Flavour Violation 116 10.3 B physics anomalies and BR(K → πνν) 120 11 Conclusions and Outlook 121 A ALPS: prescription for treating the FCNC processes 123 B ALPs: production via π 0 , η, η mixing 126 Executive SummaryThe main goal of this document follows very closely the mandate of the Physics Beyond Colliders (PBC) study group, and is "an exploratory study aimed at exploiting the full scientific potential of CERN's accelerator complex and its scientific infrastructure through projects complementary to the LHC, HL-LHC and other possible future colliders. These projects would target fundamental physics questions that are similar in spirit to those addressed by high-energy colliders, but that require different types of beams and experiments 1 ". Fundamental questions in modern particle physics as the origin of the neutrino masses and oscillations, the nature of Dark Matter and the explanation of the mechanism that drives the baryogenesis are still open today and do require an answer.So far an unambiguous signal of New Physics (NP) from direct searches at the Large Hadron Collider (LHC), indirect searches in flavour physics and direct detection Dark Matter experiments is absent. Moreover, theory provides no clear guidance on the NP scale. This imposes today, more than ever, a broadening of the experimental effort in the quest for NP. We need to explore different ranges of interaction strengths and masses with respect to what is already covered by existing or planned initiatives.Low-mass and very-weakly coupled particles represent an attractive possibility, theoretically and phenomenologically well motivated, but currently poorly explored: a systematic investigation should be pursued in the next decades both at acc...

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Section: Current Bounds and Future Experimental Landscapementioning

confidence: 99%

Physics beyond colliders at CERN: beyond the Standard Model working group report

Beacham

Burrage

Curtin

et al. 2019

J. Phys. G: Nucl. Part. Phys.

475

628

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show abstract

“…These numbers are to be compared with the current experimental results for the charged [12][13][14][15] (measured by BNL 787 and BNL 949) and neutral [16] modes (from KEK E391a), …”

Section: Introductionmentioning

confidence: 99%

Constraints on new physics from $$K \rightarrow \pi \nu {\bar{\nu }}$$

He¹,

Valencia²,

Wong³

2018

Eur. Phys. J. C

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We study generic effects of new physics on the rare decay modes K L → π 0 νν and K + → π + νν. We discuss several cases: left-handed neutrino couplings; right handed neutrino couplings; neutrino lepton flavour violating (LFV) interactions; and I = 3/2 interactions. The first of these cases has been studied before as it covers many new physics extensions of the standard model; the second one requires the existence of a new light (sterile) right-handed neutrino and its contribution to both branching ratios is always additive to the SM. The case of neutrino LFV couplings introduces a CP conserving contribution to K L → π 0 νν which affects the rates in a similar manner as a right handed neutrino as neither one of these interferes with the standard model amplitudes. Finally, we consider new physics with I = 3/2 interactions to go beyond the Grossman-Nir bound. We find that the rare kaon rates are only sensitive to new physics scales up to a few GeV for this scenario.

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“…can be determined to a precision of about 10%. This is considerably better than the precision of the previous experimental measurements [ [14][15][16][17][18][19][20] Br(K + → π + νν) exp = 1.73 +1.15 −1.05 × 10 −10 ,…”

mentioning

confidence: 73%

Exploratory Lattice QCD Study of the Rare Kaon Decay K+→π+νν¯

Bai

Christ

Feng³

et al. 2017

Phys. Rev. Lett.

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We report a first, complete lattice QCD calculation of the long-distance contribution to the K + → π + νν decay within the standard model. This is a second-order weak process involving two four-Fermi operators that is highly sensitive to new physics and being studied by the NA62 experiment at CERN. While much of this decay comes from perturbative, short-distance physics there is a long-distance part, perhaps as large as the planned experimental error, which involves nonperturbative phenomena. The calculation presented here, with unphysical quark masses, demonstrates that this contribution can be computed using lattice methods by overcoming three technical difficulties: 1) a short-distance divergence that results when the two weak operators approach each other, 2) exponentially-growing, unphysical terms which appear in Euclidean, second-order perturbation theory and 3) potentially large finite-volume effects. A follow-on calculation with physical quark masses and controlled systematic errors will be possible with the next generation of computers.Keywords: rare kaon decay, lattice QCD Introduction -An important objective of experimental high-energy physics is the search for direct and indirect signs of new physics. Complementary to the direct search for new particles and forces at high energy, is the search for subtle deviations from standard model predictions at lower energies. The rare kaon decays K → πνν are such examples. As flavor-changing-neutral-current processes, the K → πνν decay amplitudes arise as oneloop, electroweak effects. The small size of one-loop, standard model effects makes these decays particularly sensitive to new phenomena.

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Further Evidence for the DecayK+→π+νν¯

Cited by 134 publications

References 11 publications

Physics beyond colliders at CERN: beyond the Standard Model working group report

Physics beyond colliders at CERN: beyond the Standard Model working group report

Constraints on new physics from $$K \rightarrow \pi \nu {\bar{\nu }}$$

Exploratory Lattice QCD Study of the Rare Kaon Decay K+→π+νν¯

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