Eur. Phys. J. A (2021) 57: 201
https://doi.org/10.1140/epja/s10050-021-00523-7

Regular Article - Theoretical Physics

Newly discovered resonances and their parameters

¹ Institute for Physical Problems, Baku State University, 1148, Baku, Azerbaijan
² Department of Physics, University of Tehran, North Karegar Avenue, 14395-547, Tehran, Iran
³ Department of Physics, Doǧuş University, Acibadem-Kadiköy, 34722, Istanbul, Turkey
⁴ School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran
⁵ Department of Physics, Kocaeli University, 41380, Izmit, Turkey

^b kazem.azizi@ut.ac.ir

Received: 28 March 2021
Accepted: 15 June 2021
Published online: 23 June 2021

Abstract

The aim of the present article is investigation of the newly observed resonances , , and which are real candidates to charm-strange baryons. To this end, we calculate the mass and pole residue of the ground-state and excited 1P and 2S spin-1/2 flavor-sextet baryons , and with quark content csd, respectively. The masses and pole residues of the ground-state and excited spin-3/2 baryons are found as well. Spectroscopic parameters of these particles are computed in the context of the QCD two-point sum rule method. Widths of the excited baryons are evaluated through their decays to final states and . These processes are explored by means of the full QCD light-cone sum rule method necessary to determine strong couplings at relevant vertices. Obtained predictions for the masses and widths of the four excited baryons, as well as previous results for 1P and 2S flavor-antitriplet spin-1/2 particles are confronted with available experimental data on resonances to fix their quantum numbers. Our comparison demonstrates that the resonances and can be considered as 1P excitations of the spin-1/2 flavor-sextet and spin-3/2 baryons, respectively. The resonance may be interpreted as the excited 2S state of either spin-1/2 flavor-sextet or antitriplet baryon.