We measure the time-integrated CP asymmetry, A(CP), in D-0 -> pi(0)pi(0) decays reconstructed in e(+)e(-) -> c (c) over bar events collected by Belle II during 2019-2022. The data corresponds to an integrated luminosity of 428 fb(-1). The D-0 decays are required to originate from the flavor-conserving D*(+) -> D-0 pi(+) decay to determine the charm flavor at production time. Control samples of D-0 -> K-pi(+) decays, with or without an associated pion from a D*(+) decay, are used to correct for detection asymmetries. The result, A(CP) (D-0 -> pi(0)pi(0)) = (0.30 +/- 0.72 +/- 0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.

Measurement of the time-integrated CP asymmetry in D0 -> pi0 pi0 decays at Belle II

Bertacchi, V.;Bettarini, S.;Casarosa, G.;Corona, L.;Forti, F.;Massaccesi, L.;Rizzo, G.;Tenchini, F.;Trantou, F. F.;Zani, L.;
2025-01-01

Abstract

We measure the time-integrated CP asymmetry, A(CP), in D-0 -> pi(0)pi(0) decays reconstructed in e(+)e(-) -> c (c) over bar events collected by Belle II during 2019-2022. The data corresponds to an integrated luminosity of 428 fb(-1). The D-0 decays are required to originate from the flavor-conserving D*(+) -> D-0 pi(+) decay to determine the charm flavor at production time. Control samples of D-0 -> K-pi(+) decays, with or without an associated pion from a D*(+) decay, are used to correct for detection asymmetries. The result, A(CP) (D-0 -> pi(0)pi(0)) = (0.30 +/- 0.72 +/- 0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.
2025
Adachi, I.; Ahn, Y.; Akopov, N.; Alghamdi, S.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Amos, K.; Angelsmark, M.; Anh Ky, N.; Antonioli, C.; Asner, D...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1332838
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