Search for $D^0\to K^-ηe^+ν_e$, $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ decays
Creators: name: BESIII Collaboration
name: Ablikim, M.
name: Achasov, M. N.
name: Adlarson, P.
name: Afedulidis, O.
name: Ai, X. C.
name: Aliberti, R.
name: Amoroso, A.
name: An, Q.
name: Bai, Y.
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name: Balossino, I.
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name: Bao, H. -R.
name: Batozskaya, V.
name: Begzsuren, K.
name: Berger, N.
name: Berlowski, M.
name: Bertani, M.
name: Bettoni, D.
name: Bianchi, F.
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name: Bortone, A.
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name: Brueggemann, A.
name: Cai, H.
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name: Calcaterra, A.
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name: Cetin, S. A.
name: Chang, J. F.
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name: Chelkov, G.
name: Chen, C.
name: Chen, C. H.
name: Chen, Chao
name: Chen, G.
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name: Chen, H. Y.
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name: Chen, S. L.
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name: Chen, T.
name: Chen, X. R.
name: Chen, X. T.
name: Chen, Y. B.
name: Chen, Y. Q.
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name: Choi, S. K.
name: Cibinetto, G.
name: Cossio, F.
name: Cui, J. J.
name: Dai, H. L.
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name: Dbeyssi, A.
name: de Boer, R. E.
name: Dedovich, D.
name: Deng, C. Q.
name: Deng, Z. Y.
name: Denig, A.
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name: Destefanis, M.
name: De Mori, F.
name: Ding, B.
name: Ding, X. X.
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name: Ding, Y.
name: Dong, J.
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name: Dong, M. Y.
name: Dong, X.
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name: Duan, Y. Y.
name: Duan, Z. H.
name: Egorov, P.
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name: Fang, W. X.
name: Fang, Y.
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name: Farinelli, R.
name: Fava, L.
name: Feldbauer, F.
name: Felici, G.
name: Feng, C. Q.
name: Feng, J. H.
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name: Fritsch, M.
name: Fu, C. D.
name: Fu, J. L.
name: Fu, Y. W.
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name: Gao, X. B.
name: Gao, Y. N.
name: Gao, Yang
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name: Garzia, I.
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name: Gilman, A.
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name: Guskov, A.
name: Gutierrez, J.
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name: Heinsius, F. H.
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name: Kui, X.
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name: Kupsc, A.
name: Kühn, W.
name: Lane, J. J.
name: Lavezzi, L.
name: Lei, T. T.
name: Lei, Z. H.
name: Lellmann, M.
name: Lenz, T.
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name: Zhou, X. Y.
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name: Zhu, J.
name: Zhu, K.
name: Zhu, K. J.
name: Zhu, K. S.
name: Zhu, L.
name: Zhu, L. X.
name: Zhu, S. H.
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name: Zhu, Z. A.
name: Zou, J. H.
name: Zu, J.
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: By analyzing $e^+e^-$ annihilation data corresponding to an integrated luminosity of 7.93 fb$^{-1}$, collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we search for the semileptonic decays $D^0\to K^-ηe^+ν_e$, $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ for the first time. We present evidence for $D^0\to K^-ηe^+ν_e$ with a significance of $3.3σ$. The branching fraction of $D^0\to K^-ηe^+ν_e$ is measured to be $(0.84_{-0.34}^{+0.29}\pm0.22)\times 10^{-4}$. Here, the first uncertainties are statistical and the second ones are systematic. No significant signals are observed for the decays $D^+\to K_S^0 ηe^+ν_e$ and $D^+\to ηηe^+ν_e$ and we set the upper limits on their branching fractions.
description: 10 pages,4 figures