Flavor changing neutral currents and rare decays of K-mesons

Landsberg, L.G.

doi:10.1070/pu2003v046n10abeh001331

Cited by 6 publications

(2 citation statements)

References 142 publications

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“…A discrepancy would signal the presence of physics beyond the Standard Model (BSM) making the precision measurements of these decays an effective probe to search for it, see e.g. [1][2][3][4][5][6]. The branching ratio of the K L → invisible decay in the SM is predicted to be very small compared to those of Eq.…”

Section: Introductionmentioning

confidence: 99%

InvisibleKLdecays as a probe of new physics

Gninenko

Krasnikov

2015

Phys. Rev. D

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The decay KL → invisible has never been experimentally tested. In the Standard Model (SM) its branching ratio for the decay into two neutrinos is helicity suppressed and predicted to be Br(KL → νν) 10 −10 . We consider several natural extensions of the SM, such as two-Higgs-doublet (2HDM), 2HDM and light scalar, and mirror dark matter models, those main feature is that they allow to avoid the helicity suppression factor and lead to an enhanced Br(KL → invisible). For the decay KL → νν the smallness of the neutrino mass in the considered 2HDM model is explained by the smallness of the second Higgs doublet vacuum expectation value. The small nonzero value of the second Higgs isodoublet can arise as a consequence of nonzero quark condensate. We show that taking into account the most stringent constraints from the K → π + invisible decay, this process could be in the region of Br(KL → invisible) ≃ 10 −8 − 10 −6 , which is experimentally accessible. In some scenarios the KL → invisible decay could still be allowed while the K → π + invisible decay is forbidden. The results obtained show that the KL → invisible decay is a clean probe of new physics scales well above 100 TeV, that is complementary to rare K → π + invisible decay, and provide a strong motivation for its sensitive search in a near future experiment.

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Section: Introductionmentioning

confidence: 99%

InvisibleKLdecays as a probe of new physics

Gninenko

Krasnikov

2015

Phys. Rev. D

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show abstract

Section: Introductionmentioning

confidence: 99%

Invisible $K_L$ decays as a probe of new physics

Gninenko,

Krasnikov

2015

Preprint

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The decay KL → invisible has never been experimentally tested. In the Standard Model (SM) its branching ratio for the decay into two neutrinos is helicity suppressed and predicted to be Br(KL → ν ν) 10 −10 . We consider several natural extensions of the SM, such as two-Higgs-doublet (2HDM), 2HDM and light scalar, and mirror dark matter models, those main feature is that they allow to avoid the helicity suppression factor and lead to an enhanced Br(KL → invisible). For the decay KL → ν ν the smallness of the neutrino mass in the considered 2HDM model is explained by the smallness of the second Higgs doublet vacuum expectation value. The small nonzero value of the second Higgs isodoublet can arise as a consequence of nonzero quark condensate. We show that taking into account the most stringent constraints from the K → π + invisible decay, this process could be in the region of Br(KL → invisible) ≃ 10 −8 − 10 −6 , which is experimentally accessible. In some scenarios the KL → invisible decay could still be allowed while the K → π + invisible decay is forbidden. The results obtained show that the KL → invisible decay is a clean probe of new physics scales well above 100 TeV, that is complementary to rare K → π + invisible decay, and provide a strong motivation for its sensitive search in a near future experiment.

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Landsberg¹

2006

PHYS-USP

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Flavor changing neutral currents and rare decays of K-mesons

Cited by 6 publications

References 142 publications

InvisibleKLdecays as a probe of new physics

InvisibleKLdecays as a probe of new physics

Invisible $K_L$ decays as a probe of new physics

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