Observation of D0 →ρ0γ and Search for CP Violation in Radiative Charm Decays

Belle Collaboration

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, φγ, and K̄∗0(892)γ, using a data sample of 943 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10-5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→φγ)=-0.094±0.066±0.001, and ACP(D0→K̄∗0γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→φγ)=(2.76±0.19±0.10)×10-5 and B(D0→K̄∗0γ)=(4.66±0.21±0.21)×10-4.

Original languageEnglish
Article number051801
JournalPhysical Review Letters
Volume118
Issue number5
DOIs
Publication statusPublished - 2017 Jan 31

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CP violation
decay
asymmetry
detectors
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Observation of D0 →ρ0γ and Search for CP Violation in Radiative Charm Decays. / Belle Collaboration.

In: Physical Review Letters, Vol. 118, No. 5, 051801, 31.01.2017.

Research output: Contribution to journalArticle

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abstract = "We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, φγ, and K̄∗0(892)γ, using a data sample of 943 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10-5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→φγ)=-0.094±0.066±0.001, and ACP(D0→K̄∗0γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→φγ)=(2.76±0.19±0.10)×10-5 and B(D0→K̄∗0γ)=(4.66±0.21±0.21)×10-4.",
author = "{Belle Collaboration} and T. Nanut and A. Zupanc and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and I. Badhrees and Bakich, {A. M.} and V. Bansal and P. Behera and V. Bhardwaj and J. Biswal and A. Bondar and A. Bozek and M. Bračko and Browder, {T. E.} and D. Červenkov and V. Chekelian and A. Chen and Cheon, {B. G.} and R. Chistov and K. Cho and Choi, {S. K.} and Y. Choi and D. Cinabro and N. Dash and {Di Carlo}, S. and Z. DoleŽal and D. Dutta and S. Eidelman and H. Farhat and Fast, {J. E.} and T. Ferber and Fulsom, {B. G.} and V. Gaur and N. Gabyshev and A. Garmash and R. Gillard and P. Goldenzweig and B. Golob and K. Hayasaka and H. Hayashii and Hou, {W. S.} and T. Iijima and K. Inami and Eunil Won",
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AU - Nanut, T.

AU - Zupanc, A.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Aulchenko, V.

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AU - Ayad, R.

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AU - Badhrees, I.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Behera, P.

AU - Bhardwaj, V.

AU - Biswal, J.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Červenkov, D.

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AU - Chen, A.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Cho, K.

AU - Choi, S. K.

AU - Choi, Y.

AU - Cinabro, D.

AU - Dash, N.

AU - Di Carlo, S.

AU - DoleŽal, Z.

AU - Dutta, D.

AU - Eidelman, S.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gillard, R.

AU - Goldenzweig, P.

AU - Golob, B.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hou, W. S.

AU - Iijima, T.

AU - Inami, K.

AU - Won, Eunil

PY - 2017/1/31

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N2 - We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, φγ, and K̄∗0(892)γ, using a data sample of 943 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10-5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→φγ)=-0.094±0.066±0.001, and ACP(D0→K̄∗0γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→φγ)=(2.76±0.19±0.10)×10-5 and B(D0→K̄∗0γ)=(4.66±0.21±0.21)×10-4.

AB - We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, φγ, and K̄∗0(892)γ, using a data sample of 943 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10-5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→φγ)=-0.094±0.066±0.001, and ACP(D0→K̄∗0γ)=-0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→φγ)=(2.76±0.19±0.10)×10-5 and B(D0→K̄∗0γ)=(4.66±0.21±0.21)×10-4.

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