Kleimenova, Alina
FORMFACTOR
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A measurement of the $K^{+} \to \pi^{+} \mu^{+} \mu^{-}$ decay

The NA62 collaboration Cortina Gil, Eduardo ; Potrebenikov, Yuri ; Kleimenova, Alina ; et al.
JHEP 11 (2022) 011, 2022.
Inspire Record 2150453 DOI 10.17182/hepdata.135498

A sample of 2.8 × 10$^{4}$K$^{+}$ → 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 $ \mathcal{O} $(p$^{6}$).

2 data tables
Table 1

Reconstructed $K^+ \to \pi^+ \mu^+ \mu^-$ differential decay width. Only statistical errors are provided. The 4-body differential decay width (shown in green in Figure 3-left) is, in general, required to fit these data points; fitting the squared modulus of the form factor may therefore be preferable.

Table 2

Reconstructed squared modulus of the $K^+ \to \pi^+ \mu^+ \mu^-$ form factor. Only statistical errors are provided.