# New spectrum of negative-parity doubly charmed baryons: Possibility of two quasistable states

19 November 2018

Abstract: The discovery of ${\Xi }_{cc}^{++}$ by the LHCb Collaboration triggers predictions of more doubly charmed baryons. By taking into account both the $P$-wave excitations between the two charm quarks and the scattering of light pseudoscalar mesons off the ground state doubly charmed baryons, a set of negative-parity spin-$1/2$ doubly charmed baryons are predicted already from a unitarized version of leading order chiral perturbation theory. Moreover, employing heavy antiquark-diquark symmetry, the relevant low-energy constants in the next-to-leading order are connected with those describing light pseudoscalar mesons scattering off charmed mesons, which have been well determined from lattice calculations and experimental data. Our calculations result in a spectrum richer than that of heavy mesons. We find two very narrow ${J}^{P}=1/{2}^{-}$ ${\Omega }_{cc}^{P}$, which very likely decay into ${\Omega }_{cc}{\pi }^{0}$ breaking isospin symmetry. In the isospin-$1/2$ ${\Xi }_{cc}^{P}$ sector, three states are predicted to exist below 4.2 GeV with the lowest one being narrow and the other two rather broad. We suggest to search for the ${\Xi }_{cc}^{P}$ states in the ${\Xi }_{cc}^{++}{\pi }^{-}$ mode. Searching for them and their analogues are helpful to establish the hadron spectrum.

Published in: Physical Review D 98 (2018)