Test of Lepton Flavour Universality in K+−>l+ν Decays

Cristina Lazzeroni; Angela Romano; Bjorn Hallgren

doi:10.1016/j.physletb.2011.02.064

Test of Lepton Flavour Universality in K+−>l+ν Decays

Cristina Lazzeroni, Angela Romano, Bjorn Hallgren

Physics and Astronomy

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Abstract

A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.

Original language	English
Pages (from-to)	105-114
Journal	Physics Letters B
Volume	B698
Issue number	2
DOIs	https://doi.org/10.1016/j.physletb.2011.02.064
Publication status	Published - 4 Apr 2011

Keywords

Lepton universality
Leptonic kaon decay

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10.1016/j.physletb.2011.02.064

Lazzeroni_Test_lepton_flavour_Physics_Letters_B_2011Final published version, 538 KBLicence: Creative Commons: Attribution (CC BY)

http://www.sciencedirect.com/science/article/pii/S0370269311002371#

Responsive RA submission for a "New measurement of the ratio Gamma(K->e nu)/Gamma(K->mu nu) at NA48/2"
Lazzeroni, C. & Watkins, P.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/08 → 31/03/11
Project: Research Councils

Cite this

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title = "Test of Lepton Flavour Universality in K+−>l+ν Decays",

abstract = "A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.",

keywords = "Lepton universality, Leptonic kaon decay",

author = "Cristina Lazzeroni and Angela Romano and Bjorn Hallgren",

year = "2011",

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doi = "10.1016/j.physletb.2011.02.064",

language = "English",

volume = "B698",

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T1 - Test of Lepton Flavour Universality in K+−>l+ν Decays

AU - Lazzeroni, Cristina

AU - Romano, Angela

AU - Hallgren, Bjorn

PY - 2011/4/4

Y1 - 2011/4/4

N2 - A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.

AB - A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.

KW - Lepton universality

KW - Leptonic kaon decay

U2 - 10.1016/j.physletb.2011.02.064

DO - 10.1016/j.physletb.2011.02.064

M3 - Article

SN - 0370-2693

VL - B698

SP - 105

EP - 114

JO - Physics Letters B

JF - Physics Letters B

IS - 2

ER -

Test of Lepton Flavour Universality in K+−>l+ν Decays

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Keywords

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Responsive RA submission for a "New measurement of the ratio Gamma(K->e nu)/Gamma(K->mu nu) at NA48/2"

Cite this