We present a study of the rare charm meson decays D0 → KþK−eþe−, πþπ−eþe−, and K−πþeþe− using a 942 fb−1 dataset collected by the Belle detector at the KEKB asymmetric-energy eþe− collider. We identify D0 candidates via the charge of the pion from D*þ → D0πþ decays and normalize the branching fractions to D0 → K−πþπ−πþ decays. The branching fraction for decay D0 → K−πþeþe− is measured to be ð39.6 ± 4.5 ðstatÞ ± 2.9 ðsystÞÞ × 10−7, with the dielectron mass in the ρ=ω mass region 675 < mee < 875 MeV=c2. We also search for D0 → h−hð0Þþeþe− (hð0Þ ¼ K, π) decays with the dielectron mass near the η and ϕ resonances, and away from these resonances for the KþK−eþe− and πþπ−eþe− modes. For these modes, we find no significant signals and set 90% confidence level upper limits on their branching fractions at the Oð10−7Þ level.

Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Measurement of the D0 → K−π+e+e− branching fraction and search for D0 → π+π−e+e− and D0 → K+K−e+e− decays at Belle. PHYSICAL REVIEW D, 112(7), L071101-1-L071101-8 [10.1103/mkx8-cl23].

Measurement of the D0 → K−π+e+e− branching fraction and search for D0 → π+π−e+e− and D0 → K+K−e+e− decays at Belle

Di Canto A.;
2025

Abstract

We present a study of the rare charm meson decays D0 → KþK−eþe−, πþπ−eþe−, and K−πþeþe− using a 942 fb−1 dataset collected by the Belle detector at the KEKB asymmetric-energy eþe− collider. We identify D0 candidates via the charge of the pion from D*þ → D0πþ decays and normalize the branching fractions to D0 → K−πþπ−πþ decays. The branching fraction for decay D0 → K−πþeþe− is measured to be ð39.6 ± 4.5 ðstatÞ ± 2.9 ðsystÞÞ × 10−7, with the dielectron mass in the ρ=ω mass region 675 < mee < 875 MeV=c2. We also search for D0 → h−hð0Þþeþe− (hð0Þ ¼ K, π) decays with the dielectron mass near the η and ϕ resonances, and away from these resonances for the KþK−eþe− and πþπ−eþe− modes. For these modes, we find no significant signals and set 90% confidence level upper limits on their branching fractions at the Oð10−7Þ level.
2025
Adachi, I., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., et al. (2025). Measurement of the D0 → K−π+e+e− branching fraction and search for D0 → π+π−e+e− and D0 → K+K−e+e− decays at Belle. PHYSICAL REVIEW D, 112(7), L071101-1-L071101-8 [10.1103/mkx8-cl23].
Adachi, I.; Aggarwal, L.; Ahmed, H.; Ahn, Y.; Aihara, H.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Amos, K.; Angelsmark, M....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1084191
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