标题： charm衰变和光谱学在BABAR 显示英文标题

标题： Charm Decays and Spectroscopy at BABAR

摘要： 我们对罕见的底夸克衰变形式$X_c^+ \to h^{\pm} \ell^{\mp} \ell^{(')^+}$进行搜索，其中$X_c^+$是一种底强子，可以是$D^+$、$D_s^+$或$\Lambda_c^+$，而$\ell^{(')^{\pm}}$是电子或缪子。 These modes are based on 384 $fb^{-1}$ of $e^+ e^-$ annihilation data collected at the $\Upsilon(4S)$ resonance with the BABAR detector at the SLAC National Accelerator Laboratory. We also present the flavor-changing neutral-current decays $D^0 \to e^+e^-$, $D^0 \to \mu^+ \mu^-$, and $D^0 \to e^{\pm} \mu^{\mp}$ that corresponds to an integrated luminosity of 468 $fb^{-1}$ of data. 衰变$D^0 \to e^+ \mu^-$进一步具有轻子味违反特性，因此只能通过非常缓慢的中微子混合发生。 这些衰变是对可能的新物理贡献的敏感探针。 我们报告了这些衰变的分支比的新限制。 显示英文摘要

摘要： We present searches for rare charm decays of the form $X_c^+ \to h^{\pm} \ell^{\mp} \ell^{(')^+}$, where $X_c^+$ is a charm hadron either $D^+$, $D_s^+$, or $\Lambda_c^+$, and $\ell^{(')^{\pm}}$ is an electron or muon. These modes are based on 384 $fb^{-1}$ of $e^+ e^-$ annihilation data collected at the $\Upsilon(4S)$ resonance with the BABAR detector at the SLAC National Accelerator Laboratory. We also present the flavor-changing neutral-current decays $D^0 \to e^+e^-$, $D^0 \to \mu^+ \mu^-$, and $D^0 \to e^{\pm} \mu^{\mp}$ that corresponds to an integrated luminosity of 468 $fb^{-1}$ of data. The decay $D^0 \to e^+ \mu^-$ is further lepton-flavor violating, and thus occur only through very slow neutrino mixing. These decays constitute sensitive probes for possible new-physics contribution. We report new limits on the branching fractions of these decays.