Nature of the a{sub 0}(980) meson in the light of photon-photon collisions

Journal Article · Sat May 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.094029· OSTI ID:21409951

Achasov, N N; Shestakov, G N ^[1]

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1. Laboratory of Theoretical Physics, S. L. Sobolev Institute for Mathematics, 630090, Novosibirsk (Russian Federation)

New high-statistics Belle data on the reaction {gamma}{gamma}{yields}{pi}{sup 0{eta}} are analyzed to clarify the two-photon production mechanisms and the nature of the a{sub 0}(980) meson. The obtained solution for the amplitude {gamma}{gamma}{yields}{pi}{sup 0{eta}} is consistent with the chiral theory expectation for the {pi}{eta} scattering length, with the strong coupling of the a{sub 0}(980) to the {pi}{eta}, KK, and {pi}{eta}{sup '} channels, and with a key role of the rescattering mechanisms a{sub 0}(980){yields}(KK+{pi}{sup 0{eta}}+{pi}{sup 0{eta}'}){yields}{gamma}{gamma} in the a{sub 0}(980){yields}{gamma}{gamma} decay. Such a picture argues in favor of the q{sup 2}q{sup 2} nature of the a{sub 0}(980) meson and is in agreement with the properties of its partners, the {sigma}{sub 0}(600) and f{sub 0}(980) mesons, in particular, with those that manifest themselves in {gamma}{gamma}{yields}{pi}{pi}. An important role of the vector meson exchanges in the formation of the nonresonant background in {gamma}{gamma}{yields}{pi}{sup 0{eta}} is also revealed. The preliminary information on the reaction {pi}{sup 0{eta}{yields}{pi}0{eta}} is obtained.

• OSTI ID: 21409951
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 9; Other Information: DOI: 10.1103/PhysRevD.81.094029; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A0-980 MESONS
AMPLITUDES
CHIRALITY
F0-980 MESONS
MATHEMATICAL SOLUTIONS
PARTICLE DECAY
PARTICLE PRODUCTION
PHOTON-PHOTON INTERACTIONS
RESCATTERING
SCATTERING
SCATTERING LENGTHS
STRONG-COUPLING MODEL
VECTOR MESONS
BASIC INTERACTIONS
BOSONS
DECAY
DIMENSIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
HADRONS
INTERACTIONS
LENGTH
MATHEMATICAL MODELS
MESONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
SCALAR MESONS