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Particles and Fields

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. Shpenik

Uzhgorod 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 )

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