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.

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

Bianchi, F.;Boschetti, A.;Destefanis, M.;Maggiora, M.;Marcello, S.;Mussa, R.;Pinna Angioni, G.;Spataro, S.;Tamponi, U.;
2025-01-01

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
112
7
L071101-1
L071101-8
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/2318/2121190
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