Searches for lepton number violating K+ decays

NA62 Collaboration; Evgueni Goudzovski

doi:10.1016/j.physletb.2019.07.041

Searches for lepton number violating K⁺ decays

NA62 Collaboration, Evgueni Goudzovski

Physics and Astronomy

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Abstract

The NA62 experiment at CERN reports a search for the lepton number violating decays K⁺→π⁻e⁺e⁺ and K⁺→π⁻μ⁺μ⁺ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10⁻¹⁰ and 4.2×10⁻¹¹ are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

Original language	English
Article number	134794
Number of pages	9
Journal	Physics Letters B
Volume	797
Early online date	23 Jul 2019
DOIs	https://doi.org/10.1016/j.physletb.2019.07.041
Publication status	Published - 10 Oct 2019

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NA62_Collaboration_Searches_for_lepton_number_violating_K+_decays_Physics_Letters_B_2019
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@article{3b52177e4c5d4c6db7618c816dfd7043,

title = "Searches for lepton number violating K+ decays",

abstract = "The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.",

author = "{NA62 Collaboration} and Evgueni Goudzovski",

year = "2019",

month = oct,

day = "10",

doi = "10.1016/j.physletb.2019.07.041",

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AU - NA62 Collaboration

AU - Goudzovski, Evgueni

PY - 2019/10/10

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N2 - The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

AB - The NA62 experiment at CERN reports a search for the lepton number violating decays K+→π−e+e+ and K+→π−μ+μ+ using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2×10−10 and 4.2×10−11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

U2 - 10.1016/j.physletb.2019.07.041

DO - 10.1016/j.physletb.2019.07.041

M3 - Article

SN - 0370-2693

VL - 797

JO - Physics Letters B

JF - Physics Letters B

M1 - 134794

ER -

Searches for lepton number violating K+ decays

Abstract

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Searches for lepton number violating K⁺ decays