Journal
PHYSICS LETTERS B
Volume 719, Issue 4-5, Pages 326-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2013.01.037
Keywords
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Funding
- STFC [ST/K004042/1, ST/K000705/1, ST/J00412X/1, ST/K001310/1, ST/L003112/1, ST/L001195/1, PP/E000355/1, ST/H00100X/1, ST/H00100X/2, PP/F000731/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205940] Funding Source: National Science Foundation
- Science and Technology Facilities Council [PP/E000355/1, ST/K000705/1, PP/F000731/1, ST/J00412X/1, ST/K001310/1 LHCb Upgrades, ST/H00100X/2, ST/K001310/1 ATLAS Upgrades, ST/K004042/1, ST/K001310/1 LHCb, ST/K001310/1 ATLAS, ST/L001195/1, ST/L003112/1, ST/K001310/1, ST/H00100X/1] Funding Source: researchfish
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A precision measurement of the ratio R-K of the rates of kaon leptonic decays K-+/- -> e(+/-)v and K-+/- -> mu(+/-)v with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing similar to 150 000 reconstructed K-+/- -> e(+/-)v candidates with 11% background contamination, is R-K = (2.488 +/- 0.010) x 10(-5), in agreement with the Standard Model expectation. (c) 2013 Elsevier B.V. All rights reserved.
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