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Adler, S. S.; Atiya, M. S.; Chiang, I. H.; Diwan, M. V.; Frank, James S.; Haggerty, J. S.; Kettell, S. H.; Kycia, T. F.; Li, K. K.; Littenberg, L.; Ng, C.; Sambamurti, A.; Stevens, A.; Strand, R. C.; Witzig, C.; Komatsubara, T. K.; Kuriki, M.; Muramatsu, N.; Sugimoto, S.; Inagaki, T.; Kabe, S.; Kobayashi, M.; Kuno, Y.; Sato, Takahiro; Shinkawa, T.; Yoshimura, Y.; Kishi, Yoshiki; Nakano, Takashi; Ardebili, M.; Bazarko, A. O.; Convery, M. R.; Ito, M.; Marlow, D.; McPherson, R. A.; Meyers, P. D.; Shoemaker, F. C.; Smith, A. J. S.; Stone, J. R.; Aoki, M.; Blackmore, E. W.; Bergbusch, P. C.; Bryman, D. A.; Konaka, A.; Macdonald, J. A.; Mildenberger, J.; Numao, T.; Padley, P.; Poutissou, J. M.; Poutissou, R.; Redlinger, G.; Roy, J.; Turcot, A. S.; Kitching, P.; Soluk, R.

doi:10.1103/physrevlett.79.2204

Cited by 138 publications

(52 citation statements)

References 20 publications

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“…What are the experimental prospects for carrying out this program? In the mode K ± → π ± νν, the program is underway, as one event already has been observed at the Brookhaven expriment E787 [5]. The observation of this single event is consistent with the Standard Model expectation for the branching ratio at the level of 10 −10 .…”

Section: K Physicssupporting

confidence: 62%

B Decays, the Unitarity Triangle, and the Universe

Falk

2000

Int. J. Mod. Phys. A

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A review is given of recent developments in the physics of flavor. Current constraints on the Cabibbo-Kobayashi-Maskawa matrix are discussed and related to the recent measurements of ǫ ′ /ǫ, sin 2β and K + → π + νν. A brief review is given of the connection between CP violation in B decays and elec- Plenary talk presented at theThe past year has seen a number of exciting experimental developments which have advanced our understanding of the physics of flavor. These include the confirmation by KTeV [1] and NA48 [2] of the NA31 result [3] for Re(ǫ ′ /ǫ) in K L → ππ, the first measurement by CDF [4] of sin 2β in B → J/ψK S , and the observation of a single event in K → π + νν by BNL-AGS-E787 [5]. In addition, 1999 has seen the startup of the next generation of e + e − B Factory experiments: BaBar at PEP-II (SLAC), BELLE at KEK-B (KEK), and CLEO-III at CESR (Cornell). The first physics results from these machines are expected in 2000. The fixed target experiment HERA-B, operating in the HERA accelerator at DESY, will soon be taking physics data as well. For high statistics studies of the K system, KLOE at the DAΦNE φ Factory (Frascati) has also begun to take data this year.Having been assigned such an ambitious title, my plan for this talk is to locate these various developments within a broader context. How do they all fit together and relate to each other? What do they signify for the next decade of particle physics? And most important, what is the role of such "low-energy" high energy physics in the anticipated era of new discoveries at the Tevatron and LHC? In short, what do we know now about the physics of flavor, and where do we hope to go in the future? The Standard Model at low energiesWe begin by recalling what the Standard Model looks like at "low" energies, by which I mean renormalization scales µ below about 10 GeV. I will refer to this theory as the Low Energy Standard Model, or LESM. At these energies we have a theory with five quarks (u, d, s, c, b) and six leptons (e, µ, τ, ν e , ν µ , ν τ ). There is unbroken SU(3) C × U(1) EM gauge symmetry, with eight massless gluons and a massless photon. There are Dirac masses for the quarks and charged leptons, and perhaps also Majorana masses for the neutrinos. The gauge interactions and mass terms are renormalizable operators in the effective lagrangian. With the exception of neutrino masses, these interactions also conserve individual flavor quantum numbers.

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Section: K Physicssupporting

confidence: 62%

B Decays, the Unitarity Triangle, and the Universe

Falk

2000

Int. J. Mod. Phys. A

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“…However it is interesting to note that in the near future it could be excluded in a truly model-independent way by more stringent bounds on BR(K + → π + νν). Indeed if BR(K L → π 0 νν) > 2 · 10 −9 one expects from isospin analysis [33] that BR(K + → π + νν) > 4.6 · 10 −10 , not far from the recent upper bound on this mode obtained by BNL-E787 [34].…”

Section: Scenario Cmentioning

confidence: 85%

Connections between ε′/ε and rare kaon decays in supersymmetry

et al. 2000

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We analyze the rare kaon decays K L → π 0 νν, K + → π + νν, K L → π 0 e + e − and K L → µ + µ − in conjunction with the CP violating ratio ε ′ /ε in a general class of supersymmetric models in which Z-and magnetic-penguin contributions can be substantially larger than in the Standard Model. We point out that radiative effects relate the double left-right mass insertion to the single left-left one, and that the phenomenological constraints on the latter reflect into a stringent bound on the supersymmetric contribution to the Z penguin. Using this bound, and those coming from recent data on ε ′ /ε, we find BR(, assuming the usual determination of the CKM parameters and neglecting the possibility of cancellations among different supersymmetric effects in ε ′ /ε. Larger values are possible, in principle, but rather unlikely. We stress the importance of a measurement of these three branching ratios, together with improved data and improved theory of ε ′ /ε, in order to shed light on the realization of various supersymmetric scenarios. We reemphasize that the most natural enhancement of ε ′ /ε, within supersymmetric models, comes from chromomagnetic penguins and show that in this case sizable enhancements of BR(K L → π 0 e + e − ) dir can also be expected.

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“…The leptoquark exchanges also contributes to the kaon semileptonic decay, K + → π + νν. By requiring that the prediction is smaller then the observed bound of Br(K + → π + ν lνl ′ ) = 0.42 +0.97 −0.35 × 10 −9 gives constraints [23,26],…”

Section: The Modelmentioning

confidence: 99%

Neutrino mass induced radiatively by supersymmetric leptoquarks

Chua

Hwang

2000

Physics Letters B

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We show how nonzero Majorana neutrino masses can be radiatively generated by extending the MSSM with leptoquark chiral multiplets without violating R-parity. It is found that, with these particles, the R-parity conservation does not imply lepton number conservation. Neutrino masses generated at a one-loop level are closely related to the down quark mass matrix. The ratio of neutrino mass-squared splittings $\Delta m^2_{\nu_2-\nu_1}/\Delta m^2_{\nu_3-\nu_2}$ obtained is naturally close to $\Delta m^2_{s-d}/\Delta m^2_{b-s}\sim 10^{-3}$ which is in the right region required to explain both the atmospheric neutrino data and the MSW solutions for the solar neutrino data.Comment: 13 pages, one figure, more constraints added. To appear in Phys. Lett.

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Evidence for the DecayK+→π+νν¯<

Cited by 138 publications

References 20 publications

B Decays, the Unitarity Triangle, and the Universe

B Decays, the Unitarity Triangle, and the Universe

Connections between ε′/ε and rare kaon decays in supersymmetry

Neutrino mass induced radiatively by supersymmetric leptoquarks

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