Possibly New Charmed Baryon States from $\bar B^0\to p\bar p D^{0}$ Decay

TL;DR

This paper analyzes the invariant mass spectrum in a B meson decay, identifying known charmed baryons and proposing a new resonance at 3212 MeV to explain the data.

Contribution

It introduces evidence for a new charmed baryon resonance in B decay data, expanding the understanding of charmed baryon states.

Findings

Identification of known $oldsymbol{ ext{Sigma}_c(2800)^+}$, $ ext{Lambda}_c(2880)^+$, and $ ext{Lambda}_c(2940)^+$ peaks.

Necessity of a new resonance at approximately 3212 MeV to fit the spectrum.

Proposed resonance has a width of about 167 MeV.

Abstract

We examine the invariant mass spectrum of $D^{0}p$ in $\bar B^0\to p\bar p D^{0}$ decay measured by BABAR and find that through the 2-step processes of $\bar B^0\to {\bf B_c^+}(\to D^{0} p)\bar p$, where ${\bf B_c}$ denotes a charmed baryon state, some of the peaks can be identified with the established $\Sigma_c(2800)^+$, $\Lambda_c(2880)^+$ and $\Lambda_c(2940)^+$. Moreover, in order to account for the measured spectrum, it is necessary to introduce a new charmed baryon resonance with $(m,\,\Gamma)=(3212\pm 20,\,167\pm 34)$ MeV.