Eur. Phys. J. C 21, 355-359 (2001)
DOI: 10.1007/s100520100718
Calculation of hyperfine splitting in mesons using configuration interaction approach
V. Lengyel, Yu. Fekete, I. Haysak and A. ShpenikUzhgorod National University, Department of Theoretical Physics, Voloshin str. 32, 88000 Uzhgorod, Ukraine
(Received: 19 September 2000 / Revised version: 19 April 2001 / Published online: 3 August 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )
Abstract
The spin-spin mass splitting of light, heavy and mixed mesons
are described within a good accuracy in the potential model with
screened potential. We conclude that the long-range part of the
potential cannot be pure scalar and that a vector-scalar mixture
is favored. Excellent spin-spin splittings of heavy quarkonia
are obtained with the same parameters as the
ones which give the correct average
mass spectrum. The results are obtained by going beyond the usually
used perturbation method, namely using a configuration interaction
approach.
© Società Italiana di Fisica, Springer-Verlag 2001
