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$Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II$

Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II

by Sharma, G , Simon, F , P Gironella Gironell , A Di Canto , Salutari, L , Fulsom, B G , Aggarwal, L , Destefanis, M , Ono, H , Sandilya, S , Kaliyar, A B , Aihara, H , Tiwary, R , Yuan, C Z , Jacobs, W W , Laurenza, M , Kowalewski, R , Sevior, M E , Lau, T S , Cecchi, C , ti, F , Wallner, S , Campagna, Q , Rehman, J U , Yan, W , Bertacchi, V , Dujany, G , H -E Cho , Vismaya, V S , Gaz, A , Natochii, A , Gautam, V , Torassa, E , Cheema, P , Kojima, K , Kunigo, T , Bussino, S , Lewis, P M , Chirapatpimol, K , Liu, Z , Libby, J , J -G Shiu , Briere, R A , Kodyš, P , Tsaklidis, I , Stavroulakis, P , Lee, M J , Jin, Y , Cheshta, C , Prell, S , Gruberová, Z Mediankin , Hoppe, R , Hou, X T , Seino, Y , Okubo, R , Mizuk, R , Rados, P , Zhou, Q D , Massaccesi, L , Podobnik, T , Zhang, B , Thaller, A , Bennett, J V , Sumisawa, K , Lee, H , Akopov, N , Bozek, A , Meleshko, D , Merola, M , Nishida, S , Sibidanov, A , Horak, P , I Heredia de la Cruz , Pakhlova, G , de Sangro, R , Liu, M H , Ky, N Anh , Lisovskyi, V , Reif, M , Passeri, A , Yusa, Y , Senyo, K , Giordano, R , Higuchi, T , K -H Kim , Savinov, V , Y -J Kwon , Ripp-Baudot, I , Takizawa, M , McKenna, J A , Biswas, D , Stefkova, S , Banerjee, Sw , Johnson, A , Althubiti, N , Beaubien, A , Guan, Y , Schoenning, K , Liventsev, D , G

in Asymmetry / Luminosity / Mesons

2026

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Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II

in Asymmetry / Luminosity / Mesons

2026

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$Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II$

Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II

in Asymmetry / Luminosity / Mesons

2026

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$Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II$

Paper

Measurement of the \$CP\$ asymmetry in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays at Belle II

Sharma, G,

Simon, F,

P Gironella Gironell,

A Di Canto,

Salutari, L,

Fulsom, B G,

Aggarwal, L,

Destefanis, M,

Ono, H,

Sandilya, S,

Kaliyar, A B,

Aihara, H,

Tiwary, R,

Yuan, C Z,

Jacobs, W W,

Laurenza, M,

Kowalewski, R,

Sevior, M E,

Lau, T S,

Cecchi, C,

ti, F,

Wallner, S,

Campagna, Q,

Rehman, J U,

Yan, W,

Bertacchi, V,

Dujany, G,

H -E Cho,

Vismaya, V S,

Gaz, A,

Natochii, A,

Gautam, V,

Torassa, E,

Cheema, P,

Kojima, K,

Kunigo, T,

Bussino, S,

Lewis, P M,

Chirapatpimol, K,

Liu, Z,

Libby, J,

J -G Shiu,

Briere, R A,

Kodyš, P,

Tsaklidis, I,

Stavroulakis, P,

Lee, M J,

Jin, Y,

Cheshta, C,

Prell, S,

Gruberová, Z Mediankin,

Hoppe, R,

Hou, X T,

Seino, Y,

Okubo, R,

Mizuk, R,

Rados, P,

Zhou, Q D,

Massaccesi, L,

Podobnik, T,

Zhang, B,

Thaller, A,

Bennett, J V,

Sumisawa, K,

Lee, H,

Akopov, N,

Bozek, A,

Meleshko, D,

Merola, M,

Nishida, S,

Sibidanov, A,

Horak, P,

I Heredia de la Cruz,

Pakhlova, G,

de Sangro, R,

Liu, M H,

Ky, N Anh,

Lisovskyi, V,

Reif, M,

Passeri, A,

Yusa, Y,

Senyo, K,

Giordano, R,

Higuchi, T,

K -H Kim,

Savinov, V,

Y -J Kwon,

Ripp-Baudot, I,

Takizawa, M,

McKenna, J A,

Biswas, D,

Stefkova, S,

Banerjee, Sw,

Johnson, A,

Althubiti, N,

Beaubien, A,

Guan, Y,

Schoenning, K,

Liventsev, D,

2026

Overview

We measure the time- and phase-space-integrated \$CP\$ asymmetry \$A_{CP}\$ in \$D^0\\to\\pi^+\\pi^-\\pi^0\$ decays reconstructed in \$e^+e^-\\to c\\bar c\$ events collected by the Belle II experiment from 2019 to 2022. This sample corresponds to an integrated luminosity of 428 fb\$^{-1}\$. We require \$D^0\$ mesons to be produced in \$D^{*+}\\to D^0\\pi^+\$ decays to determine their flavor at production. Control samples of \$D^0\\to K^-\\pi^+\$ decays are used to correct for reconstruction-induced asymmetries. The result, \$A_{CP}(D^0\\to\\pi^+\\pi^-\\pi^0)=(0.29\\pm0.27\\pm0.13)\\%\$, where the first uncertainty is statistical and the second systematic, is the most precise result to date and is consistent with \$CP\$ conservation.

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Publisher

Cornell University Library, arXiv.org

Subject

Asymmetry

/ Luminosity

/ Mesons