Measurement of singly Cabibbo-suppressed decays $D^{0}\to\pi^{0}\pi^{0}\pi^{0}$, $\pi^{0}\pi^{0}\eta$, $\pi^{0}\eta\eta$ and $\eta\eta\eta$

Ablikim, M. ; Achasov, M. N. ; Ahmed, S. ; Albrecht, M. ; Alekseev, M. ; Amoroso, A. ; An, F. F. ; An, Q. ; Bai, J. Z. ; Bai, Y. ; Bakina, O. ; Ferroli, R. Baldini ; Ban, Y. ; Bennett, D. W. ; Bennett, J. V. ; Berger, N. ; Bertani, M. ; Bettoni, D. ; Bian, J. M. ; Bianchi, F. ; Boger, E. ; Boyko, I. ; Briere, R. A. ; Cai, H. ; Cai, X.

Using a data sample of $e^+e^-$ collision data corresponding to an integrated luminosity of 2.93 $fb^{−1}$ collected with the BESIII detector at a center-of-mass energy of $\sqrt{s}= 3.773~GeV$, we search for the singly Cabibbo-suppressed decays $^{0}\to\pi^{0}\pi^{0}\pi^{0}$, $\pi^{0}\pi^{0}\eta$, $\pi^{0}\eta\eta$ and $\eta\eta\eta$ using the double tag method. The absolute branching fractions are measured to be $\mathcal{B}(D^{0}\to\pi^{0}\pi^{0}\pi^{0}) = (2.0 \pm 0.4 \pm 0.3)\times 10^{-4}$, $\mathcal{B}(D^{0}\to\pi^{0}\pi^{0}\eta) = (3.8 \pm 1.1 \pm 0.7)\times 10^{-4}$ and $\mathcal{B}(D^{0}\to\pi^{0}\eta\eta) = (7.3 \pm 1.6 \pm 1.5)\times 10^{-4}$ with the statistical significances of 4.8σ, 3.8σ and 5.5σ, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of $D^{0}\to\eta\eta\eta$ is found, and the upper limit on its decay branching fraction is set to be $\mathcal{B}(D^{0}\to\eta\eta\eta) < 1.3 \times 10^{-4}$ at the 90% confidence level.

Publication Date:
Jun 10 2018
Date Submitted:
Jul 01 2019
Pagination:
368-375
ISSN:
0370-2693
Citation:
Physics Letters B
B781
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