A new look at the Y tetraquarks and Ωc baryons in the diquark model

• Published in: The European physical journal. C, Particles and fields Vol. 78; no. 1; pp. 1 - 13
• Main Authors: Ali, Ahmed, Maiani, Luciano, Borisov, Anatoly V., Ahmed, Ishtiaq, Aslam, M. Jamil, Parkhomenko, Alexander Ya, Polosa, Antonio D., Rehman, Abdur
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2018; Springer Nature B.V
• Subjects: Astronomy; Astrophysics and Cosmology; Baryons; Charm (particle physics); Elementary Particles; Hadrons; Heavy Ions; Mathematical models; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum numbers; Regular Article - Theoretical Physics; String Theory
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-017-5501-6

We analyze the hidden charm P -wave tetraquarks in the diquark model, using an effective Hamiltonian incorporating the dominant spin–spin, spin–orbit and tensor interactions. We compare with other P -wave systems such as P -wave charmonia and the newly discovered Ω c baryons, analysed recently in this framework. Given the uncertain experimental situation on the Y states, we allow for different spectra and discuss the related parameters in the diquark model. In addition to the presently observed ones, we expect many more states in the supermultiplet of L = 1 diquarkonia, whose J PC quantum numbers and masses are worked out, using the parameters from the currently preferred Y -states pattern. The existence of these new resonances would be a decisive footprint of the underlying diquark dynamics.