Observation of the Decay $D^0\to ρ^-μ^+ν_μ$
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Ahmed, S.
name: Albrecht, M.
name: Aliberti, R.
name: Amoroso, A.
name: An, M. R.
name: An, Q.
name: Bai, X. H.
name: Bai, Y.
name: Bakina, O.
name: Ferroli, R. Baldini
name: Balossino, I.
name: Ban, Y.
name: Begzsuren, K.
name: Berger, N.
name: Bertani, M.
name: Bettoni, D.
name: Bianchi, F.
name: Bloms, J.
name: Bortone, A.
name: Boyko, I.
name: Briere, R. A.
name: Cai, H.
name: Cai, X.
name: Calcaterra, A.
name: Cao, G. F.
name: Cao, N.
name: Cetin, S. A.
name: Chang, J. F.
name: Chang, W. L.
name: Chelkov, G.
name: Chen, D. Y.
name: Chen, G.
name: Chen, H. S.
name: Chen, M. L.
name: Chen, S. J.
name: Chen, X. R.
name: Chen, Y. B.
name: Chen, Z. J
name: Cheng, W. S.
name: Cibinetto, G.
name: Cossio, F.
name: Cui, X. F.
name: Dai, H. L.
name: Dai, X. C.
name: Dbeyssi, A.
name: de Boer, R. E.
name: Dedovich, D.
name: Deng, Z. Y.
name: Denig, A.
name: Denysenko, I.
name: Destefanis, M.
name: DeMori, F.
name: Ding, Y.
name: Dong, C.
name: Dong, J.
name: Dong, L. Y.
name: Dong, M. Y.
name: Dong, X.
name: Du, S. X.
name: Fan, Y. L.
name: Fang, J.
name: Fang, S. S.
name: Fang, Y.
name: Farinelli, R.
name: Fava, L.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Feng, J. H.
name: Fritsch, M.
name: Fu, C. D.
name: Gao, Y.
name: Gao, Y.
name: Gao, Y.
name: Gao, Y. G.
name: Garzia, I.
name: Ge, P. T.
name: Geng, C.
name: Gersabeck, E. M.
name: Gilman, A
name: Goetzen, K.
name: Gong, L.
name: Gong, W. X.
name: Gradl, W.
name: Greco, M.
name: Gu, L. M.
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name: Guan, C. Y
name: Guo, A. Q.
name: Guo, L. B.
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name: Guskov, A.
name: Han, T. T.
name: Han, W. Y.
name: Hao, X. Q.
name: Harris, F. A.
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name: Heinsius, F. H.
name: Heinz, C. H.
name: Held, T.
name: Heng, Y. K.
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name: Holtmann, T.
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name: Hou, Z. L.
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name: Huang, L. Q.
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name: Huang, Z.
name: Hussain, T.
name: Hüsken, N
name: Andersson, W. Ikegami
name: Imoehl, W.
name: Irshad, M.
name: Jaeger, S.
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name: Ji, Q.
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name: Lenz, T.
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name: Li, Cheng
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name: Li, Ke
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name: Li, Lei
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name: Li, Xiaoyu
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name: Liang, H.
name: Liang, H.
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name: Liang, Y. F.
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name: Liao, G. R.
name: Liao, L. Z.
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name: Liu, F. H.
name: Liu, Fang
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name: Liu, Huanhuan
name: Liu, Huihui
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name: Maldaner, S.
name: Malde, S.
name: Malik, Q. A.
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name: Messchendorp, J. G.
name: Mezzadri, G.
name: Min, T. J.
name: Mitchell, R. E.
name: Mo, X. H.
name: Muchnoi, N. Yu.
name: Muramatsu, H.
name: Nakhoul, S.
name: Nefedov, Y.
name: Nerling, F.
name: Nikolaev, I. B.
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name: Pathak, A.
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name: Pelizaeus, M.
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name: Peters, K.
name: Pettersson, J.
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name: Poling, R.
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Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: By analyzing an $e^+e^-$ annihilation data sample corresponding to an integrated luminosity of $2.93~\mathrm{fb}^{-1}$ collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the branching fraction of the $D^0\to ρ^- μ^+ν_μ$ decay for the first time. We obtain ${\mathcal B}_{D^0\to ρ^- μ^+ν_μ}=(1.35\pm0.09_{\rm stat}\pm0.09_{\rm syst})\times 10^{-3}$. Using the world average of ${\mathcal B}_{D^0\to ρ^- e^+ν_e}$, we find a branching fraction ratio of ${\mathcal B}_{D^0\to ρ^- μ^+ν_μ}/{\mathcal B}_{D^0\to ρ^- e^+ν_e}=0.90\pm0.11$, which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. Combining the world average of ${\mathcal B}_{D^+\to ρ^0 μ^+ ν_μ}$ and the lifetimes of $D^{0(+)}$, we obtain a partial decay width ratio of $Γ_{D^0\to ρ^- μ^+ ν_μ}/(2Γ_{D^+\to ρ^0 μ^+ ν_μ}) = 0.71\pm0.14$, which is consistent with the isospin symmetry expectation of one within $2.1σ$. For the reported values of ${\mathcal B}_{D^0\to ρ^- μ^+ν_μ}/{\mathcal B}_{D^0\to ρ^- e^+ν_e}$ and $Γ_{D^0\to ρ^- μ^+ ν_μ}/2Γ_{D^+\to ρ^0 μ^+ ν_μ}$, the uncertainty is the quadratic sum of the statistical and systematic uncertainties.
description: 9 pages, 3 figures