What question did this study set out to answer?

The aim is to measure the CP asymmetry in D0 decays into KS0 KS0 to enhance understanding of particle interactions.

March 2, 2026Open Access

Measurement of CP asymmetry in D⁰ Kₒ⁰Kₒ⁰ decays with Run 3 data

Key Points

The aim is to measure the CP asymmetry in D0 decays into KS0 KS0 to enhance understanding of particle interactions.
Utilized a sample of proton-proton collisions from the LHCb detector at 13.6 TeV
Employed D0 to KS0 π+ π- decay as a calibration channel
Analyzed data corresponding to an integrated luminosity of 6.2 fb−1
Measured time-integrated CP asymmetry to be 1.86% ± 1.04% (statistical) ± 0.41% (systematic)
Represents the most precise single-experiment determination of this CP asymmetry quantity
Results indicate potential insights into the violation of symmetries in particle physics

Abstract

A bstract A measurement of CP asymmetry in D⁰ Kₒ⁰Kₒ⁰ D 0 → 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 D⁰ Kₒ⁰^+^- D 0 → K S 0 π + π − decay is used as calibration channel to cancel residual detection and production asymmetries. The time-integrated CP asymmetry for the D⁰ Kₒ⁰Kₒ⁰ D 0 → K S 0 K S 0 mode is measured to be A^CP (D⁰ Kₒ⁰Kₒ⁰) = (1. 86 1. 04 0. 41) \%, A CP D 0 → K S 0 K S 0 = 1. 86 ± 1. 04 ± 0. 41 %, 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.

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