Observation of $D^{+}\to \eta \eta {\pi }^{+}$ and improved measurement of $D^{0(+)}\to \eta {\pi }^{+}{\pi }^{-(0)}$

Abstract

Using an $e^{+}{e}^{-}$ annihilation data sample corresponding to an integrated luminosity of $2.93\mathrm{f}{\mathrm{b}}^{-1}$ collected at the center-of-mass energy of 3.773\,GeV with the BESIII detector, we measure the absolute branching fractions of $D^{+}\to \eta \eta {\pi }^{+}$, $D^{+}\to \eta {\pi }^{+}{\pi }^0$, and $D^0\to \eta {\pi }^{+}{\pi }^{-}$ to be $(2.96\pm 0.24\pm 0.13)\times 10^{-3}$, $(2.23\pm 0.15\pm 0.11)\times 10^{-3}$, and $(1.20\pm 0.07\pm 0.04)\times 10^{-3}$, respectively, where the first uncertainties are statistical and the second ones systematic. The $D^{+}\to \eta \eta {\pi }^{+}$ decay is observed for the first time and the branching fractions of $D^{+(0)}\to \eta {\pi }^{+}{\pi }^{0(-)}$ are measured with much improved precision. In addition we test for $CP$ asymmetries in the separated charge-conjugate branching fractions; no evidence of $CP$ violation is found.

10 pages, 4 figures

References in corpus (2)

• Branching ratios and direct CP asymmetries in $D\to PP$ decays
• Measurement of the $D\to K^{-}{\pi }^{+}$ strong phase difference in $\psi (3770)\to D^0\overline{D}{}^0$

Cited by in corpus (16)

• First Observation of $D^{+}\to \eta {\mu }^{+}{\nu }_{\mu }$ and Measurement of its Decay Dynamics
• Observation of the semi-muonic decay $D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }$
• Search for the semileptonic decay $D^{0(+)}\to b_1(1235{)}^{-(0)}{e}^{+}{\nu }_e$
• Observation of the Doubly Cabibbo-Suppressed Decay $D^{+}\to K^{+}{\pi }^{+}{\pi }^{-}{\pi }^0$ and Evidence for $D^{+}\to K^{+}\omega$
• Search for baryon and lepton number violating decays $D^0\to \bar{p}{e}^{+}$ and $D^0\to p{e}^{-}$
• Determination of the absolute branching fractions of $D^0\to K^{-}{e}^{+}{\nu }_e$ and $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$
• Observation of the Decay $D^0\to {\rho }^{-}{\mu }^{+}{\nu }_{\mu }$
• Measurements of the absolute branching fractions of $D^{0(+)}\to K\bar{K}\pi \pi$ decays
• Measurement of branching fractions and search for $CP$ violation in $D^0\to {\pi }^{+}{\pi }^{-}\eta$, $D^0\to K^{+}{K}^{-}\eta$, and $D^0\to \varphi \eta$ at Belle
• Observation of $D^{0(+)}\to K_S^0{\pi }^{0(+)}\omega$ and improved measurement of $D^0\to K^{-}{\pi }^{+}\omega$
• Hadronic decay $D^{+}\to {\pi }^{+}\eta \eta$ and the $a_0(980)$ and $f_0(1370)$ contributions
• Absolute Measurements of Branching Fractions of Cabibbo-Suppressed Hadronic $D^{0(+)}$ Decays Involving Multiple Pions
• Search for the lepton number violation decay $\omega \to {\pi }^{+}{\pi }^{+}{e}^{-}{e}^{-}+c.c.$
• CP violation in quasi-two-body $D\to VP$ decays and three-body $D$ decays mediated by vector resonances
• Measurement of Singly Cabibbo-Suppressed Decays $D\to \omega \pi \pi$
• Roles of $a_0(980)$ and $a_0(1710)$ in Cabibbo-suppressed process $D^{+}\to {\pi }^0{\pi }^{+}\eta$