Measurements of Absolute Branching Fractions for Exclusive $D^0$ Semileptonic Decays

TL;DR

This paper reports precise measurements of absolute branching fractions for specific $D^0$ semileptonic decays, including the first observation of $D^0 o ho^-e^+ u$, enhancing understanding of charm quark transitions.

Contribution

It provides improved measurements of $D^0$ semileptonic decay branching fractions and reports the first observation of the $D^0 o ho^-e^+ u$ decay.

Findings

Measured branching fractions for $D^0 o K^-e^+ u$, $ ho^-e^+ u$, $ar{K}^{*-}e^+ u$, $ar{ ho}^-e^+ u$

First observation of $D^0 o ho^-e^+ u$ decay

Reviewed determinations of CKM matrix elements $V_{cs}$ and $V_{cd}$

Abstract

Based on a data sample of 60 pb$^{-1}$ collected at the $\psi(3770)$ resonance with the CLEO-c detector at CESR, we present improved measurements of absolute branching fractions for exclusive $D^0$ semileptonic decays into $K^-e^+\nu$, $\pi^-e^+\nu$ and $K^{*-}e^+\nu$, and the first observation and measurement of $D^0 \to \rho^-e^+\nu$. The determinations of the CKM matrix elements $V_{cs}$ and $V_{cd}$ are reviewed.