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Aug 16 – 21, 2019
Guilin Bravo Hotel, Guilin, China
Asia/Shanghai timezone

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

Aug 20, 2019, 2:25 PM
20m
Guilin Bravo Hotel, Guilin, China

Guilin Bravo Hotel, Guilin, China

14 South Ronghu Road, Xiangshan, Guilin 541002, Guangxi, China
Parallel Session 2: Baryon spectroscopy Session 2: Baryon sepctroscopy

Speaker

Dr Maojun Yan (ITP, CAS)

Description

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.

Primary authors

Dr Maojun Yan (ITP, CAS) Dr Xiao-Hai Liu (Center for Joint Quantum Studies, Department of Physics, School of Science, Tianjin University)

Co-authors

Prof. Bingsong ZOU Bingsong (IHEP, CAS) Dr Christoph Hanhart (IAS, Forschungszentrum Juelich, Germany) Dr Feng-Kun Guo (ITP, CAS) Prof. Ulf-G. Meissner (Universitaet Bonn and Forschungszentrum Juelich)

Presentation materials