Description of scalar mesons as two and four quark states

Authors

  • 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

Keywords:

low energy interactions, quark models, scalar mesons

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

Issue

No. 1 (2019): Journal of the Belarusian State University. Physics

Section

Atomic Nucleus and Elementary Particle Physics

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How to Cite

(1)
Avakyan, E. Z.; Avakyan, S. L. Description of Scalar Mesons As Two and Four Quark States. Журнал Белорусского государственного университета. Физика 2019, No. 1, 72-87.