A sample of 2.8 x 10(4) K+ -> pi(+)mu(+)mu(-) 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) x 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 (p(6)).

A measurement of the K+→ π+μ+μ- decay

Arcidiacono, R;
2022-01-01

Abstract

A sample of 2.8 x 10(4) K+ -> pi(+)mu(+)mu(-) 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) x 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 (p(6)).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11579/186642
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