Search for the semileptonic decay $D^{0(+)}\to b_1(1235{)}^{-(0)}{e}^{+}{\nu }_e$

Abstract

Using $2.93{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected at a center-of-mass energy $\sqrt{s}=3.773$ GeV with the BESIII detector operating at the BEPCII collider, we search for the semileptonic $D^{0(+)}$ decays into a $b_1(1235{)}^{-(0)}$ axial-vector meson for the first time. No significant signal is observed for either charge combination. The upper limits on the product branching fractions are ${\mathcal{B}}_{D^0\to b_1(1235{)}^{-}{e}^{+}{\nu }_e}\cdot {\mathcal{B}}_{b_1(1235{)}^{-}\to \omega {\pi }^{-}}<1.12\times 10^{-4}$ and ${\mathcal{B}}_{D^{+}\to b_1(1235{)}^0{e}^{+}{\nu }_e}\cdot {\mathcal{B}}_{b_1(1235{)}^0\to \omega {\pi }^0}<1.75\times 10^{-4}$ at the 90\% confidence level.

arXiv comment9 pages, 3 figures

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• Observation of the Decay $D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }$
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• Exclusive semileptonic decays of $D$ and $D_s$ mesons into orbitally and radially excited states of strange and light mesons
• Longitudinal leading-twist distribution amplitude of the ${}^1{P}_1$-state $b_1(1235)$ meson and its implications on $B\to b_1(1235){\ell }^{+}{\nu }_{\ell }$ decays
• Observation of the singly Cabibbo suppressed decay $D^0\to b_1(1235{)}^{-}{e}^{+}{\nu }_e$ and evidence for $D^{+}\to b_1(1235{)}^0{e}^{+}{\nu }_e$