kaon physics at cern – recent results from the na48/2 and na62 experiments
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2012
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Abstract
This letter presents recent results from the kaon experiments NA48/2 and its successor NA62 at CERN. With samples of 2.5 × 106 Kµ3± and 4.0 × 106 Ke3± events collected by NA48/2 in 2004, precise measurements of the form factors were performed. The Chiral Perturbation Theory was tested through a new study of K± → π±γγ decays based on data taken with minimal trigger conditions. Using the beam line and detector of NA48/2 in the years 2007-2008, NA62 performed a precison measurement of the helicitysuppressed ratio of the charged kaon leptonic decay rates K± → e+ν and K± → μ+ν Using the full data set, which is about ten times larger than the previous world data sample, the total uncertainty on this ratio is only 0.4%, representing a precision test of μ – e lepton universality. Finally, the main stage of the NA62 experiment is presented. The planned measurement of the ultra rare decay K+ → π+ vv¯ $var v$ at 10% precision will provide a powerful test of the Standard Model. The experimental challenges to reach this goal require new detectors with exceptional performances.
| Reference Key |
andreas2012epjkaon
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| Authors | ;Winhart Andreas |
| Journal | utilitas mathematica |
| Year | 2012 |
| DOI |
10.1051/epjconf/20123701010
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