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2012-09-21
21:27
Measurement of the branching ratio of the decay $\Xi^{0} \rightarrow \Sigma^{+} \mu^{-} \overline{\nu}_{\mu}$ / NA48/1 Collaboration
From the 2002 data taking with a neutral kaon beam extracted from the CERN-SPS, the NA48/1 experiment observed 97 $\Xi^{0}\rightarrow \Sigma^{+} \mu^{-} \bar{\nu}_{\mu}$ candidates with a background contamination of $30.8 \pm 4.2$ events. From this sample, the BR($\Xi^{0}\rightarrow \Sigma^{+} \mu^{-} \bar{\nu}_{\mu}$) is measured to be $(2.17 \pm 0.32_{\mathrm{stat}}\pm 0.17_{\mathrm{syst}})\times10^{-6}$..
arXiv:1212.3131; CERN-PH-EP-2012-288.- Geneva : CERN, 2013 - 12 p. - Published in : Phys. Lett. B 720 (2013) 105-110 Draft (restricted): PDF; Fulltext: PDF PDF (PDFA); Preprint: PDF; External link: Preprint

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2012-03-26
12:37
Precision Measurement of the Ratio of the Charged Kaon Leptonic Decay Rates / Lazzeroni, C (Birmingham U.) ; Romano, A (Birmingham U.) ; Ceccucci, A (CERN) ; Danielsson, H (CERN) ; Falaleev, V (CERN) ; Gatignon, L (CERN) ; Goy Lopez, S (CERN ; Madrid, CIEMAT) ; Hallgren, B (CERN ; Birmingham U.) ; Maier, A (CERN) ; Peters, A (CERN) et al.
A precision measurement of the ratio $R_K$ of the rates of kaon leptonic decays $K^\pm \to e^\pm\nu$ and $K^\pm \to \mu^\pm \nu$ with the full data sample collected by the NA62 experiment at CERN in $2007-2008$ is reported. The result, obtained by analysing $\sim\!150000$ reconstructed $K^\pm \to e^\pm \nu$ candidates with $11\%$ background contamination, is $R_K = (2.488\pm0.010)\times10^{-5}$, in agreement with the Standard Model expectation..
arXiv:1212.4012; CERN-PH-EP-2012-367.- Geneva : CERN, 2013 - 18 p. - Published in : Phys. Lett. B 719 (2013) 326-336 Draft (restricted): PDF PDF (PDFA); Fulltext: authors list - TEX; CERN-PH-EP-2012-367 - PDF PDF (PDFA); External link: Preprint

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2011-01-08
19:08
Test of Lepton Flavour Universality in $K^{+} \to l^{+}\nu$ Decays / NA62 Collaboration
A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ --> e+nu and K+ --> mu+nu in a sample of 59813 reconstructed K+ --> e+nu candidates with (8.71 +- 0.24)% background contamination. The result RK = (2.487 +- 0.013) * 10^{-5} is in agreement with the Standard Model expectation..
arXiv:1101.4805; CERN-PH-EP-2011-004.- 2011 - 16 p. - Published in : Phys. Lett. B 698 (2011) 105-114 Draft (restricted): PDF; Fulltext: PDF PDF (PDFA); External link: Preprint

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