Observation of D0ρ0γ and Search for CP Violation in Radiative Charm Decays

T. Nanut et al. (Belle Collaboration)
Phys. Rev. Lett. 118, 051801 – Published 31 January 2017
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Abstract

We report the first observation of the radiative charm decay D0ρ0γ and the first search for CP violation in decays D0ρ0γ, ϕγ, and K¯*0(892)γ, using a data sample of 943fb1 collected with the Belle detector at the KEKB asymmetric-energy e+e collider. The branching fraction is measured to be B(D0ρ0γ)=(1.77±0.30±0.07)×105, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0ρ0γ)=+0.056±0.152±0.006, ACP(D0ϕγ)=0.094±0.066±0.001, and ACP(D0K¯*0γ)=0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0ϕγ)=(2.76±0.19±0.10)×105 and B(D0K¯*0γ)=(4.66±0.21±0.21)×104.

  • Figure
  • Received 4 November 2016

DOI:https://doi.org/10.1103/PhysRevLett.118.051801

© 2017 American Physical Society

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Vol. 118, Iss. 5 — 3 February 2017

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