scholarly journals Chiral perturbation theory and the determination of the proton radius from the muonic hydrogen Lamb shift

2012 ◽  
Author(s):  
Antonio Miguel Pineda Ruiz
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Lamb Shift ◽  
Muonic Hydrogen ◽  
Chiral Perturbation ◽  
Proton Radius

scholarly journals Latest results on rare kaon decays from the NA48/2 experiment @CERN

2020 ◽  
Vol 35 (36) ◽  
pp. 2044019
Author(s):  
N. Molokanova
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Precise Measurement ◽  
Branching Ratio ◽  
Form Factors ◽  
Charged Kaon ◽  
Chiral Perturbation ◽  
Kaon Decays ◽  
Kinematic Space

The NA48/2 experiment at CERN reports the first observation of the [Formula: see text] decay from an exposure of [Formula: see text] charged kaon decays recorded in 2003–2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region. The study of the kinematic space shows evidence for a structure-dependent contribution in agreement with predictions based on chiral perturbation theory. Several [Formula: see text]- and [Formula: see text]-violating asymmetries are also evaluated. The most precise measurement of the charged kaon semi-leptonic form factors obtained by NA48/2 with 4.4 million [Formula: see text] and 2.3 million [Formula: see text] events collected in 2004 will also be presented.

scholarly journals Determination of low-energy constants of Wilson chiral perturbation theory

2013 ◽  
Vol 2013 (5) ◽  
Author(s):  
Gregorio Herdoíza ◽  
◽  
Karl Jansen ◽  
Chris Michael ◽  
Konstantin Ottnad ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Low Energy ◽  
Chiral Perturbation ◽  
Energy Constants
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