Observation of $D^0\to \rho^0\gamma$ and search for $CP$ violation in radiative charm decays
Creators: name: Abdesselam, A.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Said, S. Al
name: Arinstein, K.
name: Arita, Y.
name: Asner, D. M.
name: Aso, T.
name: Atmacan, H.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Aziz, T.
name: Babu, V.
name: Badhrees, I.
name: Bahinipati, S.
name: Bakich, A. M.
name: Bala, A.
name: Ban, Y.
name: Bansal, V.
name: Barberio, E.
name: Barrett, M.
name: Bartel, W.
name: Bay, A.
name: Bedny, I.
name: Behera, P.
name: Belhorn, M.
name: Belous, K.
name: Besson, D.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bischofberger, M.
name: Biswal, J.
name: Bloomfield, T.
name: Blyth, S.
name: Bobrov, A.
name: Bondar, A.
name: Bonvicini, G.
name: Bookwalter, C.
name: Boulahouache, C.
name: Bozek, A.
name: Bracko, M.
name: Breibeck, F.
name: Brodzicka, J.
name: Browder, T. E.
name: Cervenkov, D.
name: Chang, M. C.
name: Chang, P.
name: Chao, Y.
name: Chekelian, V.
name: Chen, A.
name: Chen, K. F.
name: Chen, P.
name: Cheon, B. G.
name: Chilikin, K.
name: Chistov, R.
name: Cho, K.
name: Chobanova, V.
name: Choi, S. K.
name: Choi, Y.
name: Cinabro, D.
name: Crnkovic, J.
name: Dalseno, J.
name: Danilov, M.
name: Dash, N.
name: Di Carlo, S.
name: Dingfelder, J.
name: Dolezal, Z.
name: Drasal, Z.
name: Drutskoy, A.
name: Dubey, S.
name: Dutta, D.
name: Dutta, K.
name: Eidelman, S.
name: Epifanov, D.
name: Esen, S.
name: Farhat, H.
name: Fast, J. E.
name: Feindt, M.
name: Ferber, T.
name: Frey, A.
name: Frost, O.
name: Fujikawa, M.
name: Fulsom, B. G.
name: Gaur, V.
name: Gabyshev, N.
name: Ganguly, S.
name: Garmash, A.
name: Getzkow, D.
name: Gillard, R.
name: Giordano, F.
name: Glattauer, R.
name: Goh, Y. M.
name: Goldenzweig, P.
name: Golob, B.
name: Greenwald, D.
name: Grosse Perdekamp, M.
name: Grygier, J.
name: Grzymkowska, O.
name: Guo, H.
name: Haba, J.
name: Hamer, P.
name: Han, Y. L.
name: Hara, K.
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name: Hasegawa, Y.
name: Hasenbusch, J.
name: Hayasaka, K.
name: Hayashii, H.
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name: Heck, M.
name: Hedges, M. T.
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name: Heller, A.
name: Higuchi, T.
name: Himori, S.
name: Hirose, S.
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name: Hoshi, Y.
name: Hoshina, K.
name: Hou, W. S.
name: Hsiung, Y. B.
name: Hsu, C. L.
name: Huschle, M.
name: Hyun, H. J.
name: Igarashi, Y.
name: Iijima, T.
name: Imamura, M.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itagaki, K.
name: Itoh, R.
name: Iwabuchi, M.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Iwata, S.
name: Jacobs, W. W.
name: Jaegle, I.
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name: Jones, M.
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name: Julius, T.
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name: Kapusta, P.
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name: Lee, D. H.
name: Lee, I. S.
name: Lee, S. H.
name: Leitgab, M.
name: Leitner, R.
name: Levit, D.
name: Lewis, P.
name: Li, C. H.
name: Li, H.
name: Li, J.
name: Li, L.
name: Li, X.
name: Li, Y.
name: Li Gioi, L.
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name: Negishi, K.
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name: Piilonen, L. E.
name: Poluektov, A.
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name: Vahsen, S. E.
name: Van Hulse, C.
name: Vanhoefer, P.
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name: Varvell, K. E.
name: Vervink, K.
name: Vinokurova, A.
name: Vorobyev, V.
name: Vossen, A.
name: Wagner, M. N.
name: Wang, C. H.
name: Wang, J.
name: Wang, M. Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Watanabe, Y.
name: Wedd, R.
name: Wehle, S.
name: White, E.
name: Wiechczynski, J.
name: Williams, K. M.
name: Won, E.
name: Yabsley, B. D.
name: Yamada, S.
name: Yamamoto, H.
name: Yamaoka, J.
name: Yamashita, Y.
name: Yamauchi, M.
name: Yashchenko, S.
name: Ye, Hua
name: Yelton, J.
name: Yook, Y.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zhang, C. C.
name: Zhang, L. M.
name: Zhang, Z. P.
name: Zhao, L.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
name: Ziegler, M.
name: Zivko, T.
name: Zupanc, A.
name: Zwahlen, N.
name: Zyukova, O.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2016
Subjects: talk: La Thuile 2016/03/06
D0: branching ratio
asymmetry: CP
D0: radiative decay
statistical
BELLE
KEK-B
experimental results
D0 --&gt; Phi(1020) photon
D0 --&gt; K*(892)0 photon
D0 --&gt; rho(770)0 photon

description: We report the first observation of the radiative charm decay $D^0 \to \rho^0 \gamma$ and the first search for $CP$ violation in decays $D^0 \to \rho^0 \gamma$, $\phi\gamma$, and $\overline{K}{}^{*0} \gamma$, 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 $\mathcal{B}(D^0 \to \rho^0 \gamma)=(1.77 \pm 0.30 \pm 0.07) \times 10^{-5}$, where the first uncertainty is statistical and the second is systematic. The obtained $CP$ asymmetries, $\mathcal{A}_{CP}(D^0 \to \rho^0 \gamma)=+0.056 \pm 0.152 \pm 0.006$, $\mathcal{A}_{CP}(D^0 \to \phi \gamma)=-0.094 \pm 0.066 \pm 0.001$, and $\mathcal{A}_{CP}(D^0 \to \overline{K}{}^{*0} \gamma)=-0.003 \pm 0.020 \pm 0.000$, are consistent with no $CP$ violation. We also present an improved measurement of the branching fractions $\mathcal{B}(D^0 \to \phi \gamma)=(2.76 \pm 0.19 \pm 0.10) \times 10^{-5}$ and $\mathcal{B}(D^0 \to \overline{K}{}^{*0} \gamma)=(4.66 \pm 0.21 \pm 0.21) \times 10^{-4}$.