New measurement of the K<sup>+</sup> ? p<sup>+</sup>µ<sup>+</sup>µ<sup>-</sup>decay at NA62



Bician, L, Aliberti, R, Ambrosino, F, Ammendola, R, Angelucci, B, Antonelli, A, Anzivino, G, Arcidiacono, R, Bache, T, Baeva, A
et al (show 90 more authors) (2021) New measurement of the K<sup>+</sup> ? p<sup>+</sup>µ<sup>+</sup>µ<sup>-</sup>decay at NA62. .

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Abstract

A preliminary result of a new measurement of the K+ ?p+µ+µ- form factor parameters and branching fraction using the NA62 Run 1 data set collected in the years 2016 - 2018 is presented. From the observed sample of 28011 K+ ? p+µ+µ- event candidates with negligible background contamination, the form factor parameters a+ = -0.592 ± 0.013stat ± 0.007syst ± 0.001ext and b+ = -0.699 ± 0.046stat ± 0.035syst ± 0.003ext, and the branching fraction B(K+ ? p+µ+µ-) = (9.27 ± 0.07stat ± 0.08syst ± 0.04ext) × 10-8 are obtained.

Item Type: Conference or Workshop Item (Unspecified)
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 Dec 2021 14:34
Last Modified: 06 Oct 2022 06:16
Open Access URL: https://pos.sissa.it/390/364/pdf
URI: https://livrepository.liverpool.ac.uk/id/eprint/3145507