abstract

• A sample of 2.8 × 104K → π μ μ− candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) × 10−8, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at O(p6). © 2022, The Author(s).
• A sample of 2.8 × 104K%2b → π%2bμ%2bμ− candidates with negligible background was collected by the NA62 experiment at the CERN SPS in 2017–2018. The model-independent branching fraction is measured to be (9.15 ± 0.08) × 10−8, a factor three more precise than previous measurements. The decay form factor is presented as a function of the squared dimuon mass. A measurement of the form factor parameters and their uncertainties is performed using a description based on Chiral Perturbation Theory at O(p6). © 2022, The Author(s).

authors

• Engelfried Jatzkowski Jurgen
• The NA62 Collaboration

publication date

• 2022-01-01

published in

• Journal of High Energy Physics  Journal

keywords

• Branching fraction; Fixed Target Experiments; Flavour Changing Neutral Currents; Rare Decay

Digital Object Identifier (DOI)

• 10.1007/JHEP11(2022)011

PubMed ID

start page

end page

volume

• 2022

issue

• 11