A measurement of CP asymmetry in $D^0 \to K_S^0 K_S^0$ decays is reported, based on a data sample of proton-proton collisions collected with the LHCb detector in 2024 at a centre-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 6.2 fb$^{-1}$. The $D^0 \to K_S^0 \pi^+\pi^-$ decay is used as calibration channel to cancel residual detection and production asymmetries. The time-integrated CP asymmetry for the $D^0 \to K_S^0 K_S^0$ mode is measured to be (Formula presented.) where the first uncertainty is statistical, and the second is systematic. This measurement represents the most precise single-experiment determination of this quantity to date.
Measurement of CP asymmetry in $D^0 \to K_S^0 K_S^0$ decays with Run 3 data
Celestino I.Membro del Collaboration Group
;Cordova G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.
Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;Xu A.Membro del Collaboration Group
;
2026
Abstract
A measurement of CP asymmetry in $D^0 \to K_S^0 K_S^0$ decays is reported, based on a data sample of proton-proton collisions collected with the LHCb detector in 2024 at a centre-of-mass energy of 13.6 TeV, corresponding to an integrated luminosity of 6.2 fb$^{-1}$. The $D^0 \to K_S^0 \pi^+\pi^-$ decay is used as calibration channel to cancel residual detection and production asymmetries. The time-integrated CP asymmetry for the $D^0 \to K_S^0 K_S^0$ mode is measured to be (Formula presented.) where the first uncertainty is statistical, and the second is systematic. This measurement represents the most precise single-experiment determination of this quantity to date.| File | Dimensione | Formato | |
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JHEP02(2026)253(1).pdf
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