Description of scalar mesons as two and four quark states

  • Elena Z. Avakyan Sukhoi State Technical University of Gomel, 48 Kastryčnika Avenue, Gomel 246746, Belarus
  • Sergey L. Avakyan Sukhoi State Technical University of Gomel, 48 Kastryčnika Avenue, Gomel 246746, Belarus

Abstract

Light scalar mesons were studied in the framework of quark models. It is shown that, in the Quark Confinment Model (QCM), the description of these mesons requires the introduction of an additional term with the derivative in the Lagrangian of interaction. The parameters of the additional interaction were obtained, the mass of the f0(600) meson (mf0 = 500-515) was fitted from experimental data on the lengths of π scattering. Light scalar mesons were also (600) considered in the Confined Covariant Quark Model (CCQM), in which the interaction of a meson with quarks is non-local. In the framework of the CCQM, interactions with two-quark and four-quark currents were considered. It is shown that the S → PP decay form factor has the correct behavior in both schemes. This suggests that scalar mesons can be described as both two-quark and four-quark states.

Author Biographies

Elena Z. Avakyan, Sukhoi State Technical University of Gomel, 48 Kastryčnika Avenue, Gomel 246746, Belarus

PhD (physics and mathematics), docent; associate professor at the department of higher mathematics, faculty of automated and information systems

Sergey L. Avakyan, Sukhoi State Technical University of Gomel, 48 Kastryčnika Avenue, Gomel 246746, Belarus

PhD (physics and mathematics), docent; associate professor at the department of higher mathematics, faculty of automated and information systems

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Published
2019-02-10
Keywords: low energy interactions, quark models, scalar mesons
How to Cite
Avakyan, E. Z., & Avakyan, S. L. (2019). Description of scalar mesons as two and four quark states. Journal of the Belarusian State University. Physics, 1, 72-87. Retrieved from https://journals.bsu.by/index.php/physics/article/view/1385
Issue
No 1 (2019): Journal of the Belarusian State University. Physics
Section
Atomic Nucleus and Elementary Particle Physics

Copyright (c) 2019 Journal of the Belarusian State University. Physics

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