Observation of new excited $\hat{I}{\pounds }_c^0$ states in the $B^{-}\to \hat{I}{›}_c^{+}\overline{p}\ddot{I}{€}^{-}$ decay

Abstract

An amplitude analysis of the $B^{-}\to \hat{I}{›}_c^{+}\overline{p}\ddot{I}{€}^{-}$ decay is performed using proton-proton collision data, corresponding to an integrated luminosity of $9{\text{ fb}}^{-1}$, collected with the \mbox{LHCb} detector at center-of-mass energies of 7, 8, and 13$\text{ TeV}$. In the $\hat{I}{›}_c^{+}\ddot{I}{€}^{-}$ invariant-mass spectrum, the known $\hat{I}{\pounds }_c(2455{)}^0$, $\hat{I}{\pounds }_c(2520{)}^0$, $\hat{I}{\pounds }_c(2800{)}^0$ baryons are observed, along with two new states: $\hat{I}{\pounds }_c(2900{)}^0$ and $\hat{I}{\pounds }_c(3200{)}^0$. The masses and widths of the three high-mass states, modeled with Breit--Wigner line shapes, are determined. This result expands the landscape of charm baryon spectroscopy and provides crucial data for understanding charm baryon structure and dynamics.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/4477/ (LHCb public pages)