https://doi.org/10.1140/epjc/s10052-017-5501-6
Regular Article - Theoretical Physics
A new look at the Y tetraquarks and 
baryons in the diquark model
1
Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany
2
Theory Division, CERN, Geneva, Switzerland
3
Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow, 119991, Russia
4
National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, 45320, Pakistan
5
Department of Physics, Quaid-i-Azam University, Islamabad, 45320, Pakistan
6
Department of Theoretical Physics, P. G. Demidov Yaroslavl State University, Sovietskaya 14, Yaroslavl, 150003, Russia
7
Dipartimento di Fisica, INFN, Sapienza Universita di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
* e-mail: ahmed.ali@desy.de
Received:
3
November
2017
Accepted:
21
December
2017
Published online:
15
January
2018
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 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 
diquarkonia, whose 
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.
© The Author(s), 2018
